{"pageNumber":"4753","pageRowStart":"118800","pageSize":"25","recordCount":165605,"records":[{"id":70011328,"text":"70011328 - 1983 - Thermal decarboxylation of acetic acid: Implications for origin of natural gas","interactions":[],"lastModifiedDate":"2024-03-19T15:46:16.412696","indexId":"70011328","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1759,"text":"Geochimica et Cosmochimica Acta","active":true,"publicationSubtype":{"id":10}},"title":"Thermal decarboxylation of acetic acid: Implications for origin of natural gas","docAbstract":"<p>Laboratory experiments on the thermal decarboxylation of solutions of acetic acid at 200°C and 300°C were carried out in hydrothermal equipment allowing for on-line sampling of both the gas and liquid phases for chemical and stable-carbon-isotope analyses. The solutions had ambient pH values between 2.5 and 7.1; pH values and the concentrations of the various acetate species at the conditions of the experiments were computed using a chemical model.</p><p>Results show that the concentrations of acetic acid, and not total acetate in solution, control the reaction rates which follow a first order equation based on decreasing concentrations of acetic acid with time. The decarboxylation rates at 200°C (1.81 × 10<sup>−8</sup><span>&nbsp;</span>per second) and 300°C (8.17 × 10<sup>−8</sup><span>&nbsp;</span>per second) and the extrapolated rates at lower temperatures are relatively high. The activation energy of decarboxylation is only 8.1 kcal/mole. These high decarboxylation rates, together with the distribution of short-chained aliphatic acid anions in formation waters, support the hypothesis that acid anions are precursors for an important portion of natural gas.</p><p>Results of the<span>&nbsp;</span><i>δ</i><sup>13</sup><i>C</i><span>&nbsp;</span>values of CO<sub>2</sub>, CH<sub>4</sub>, and total acetate show a reasonably constant fractionation factor of about 20 permil between CO<sub>2</sub><span>&nbsp;</span>and CH<sub>4</sub><span>&nbsp;</span>at 300°C. The<span>&nbsp;</span><i>δ</i><sup>13</sup><i>C</i><span>&nbsp;</span>values of CO<sub>2</sub><span>&nbsp;</span>and CH<sub>4</sub><span>&nbsp;</span>are initially low and become higher as decarboxylation increases.</p>","language":"English","publisher":"Elsevier","doi":"10.1016/0016-7037(83)90262-4","issn":"00167037","usgsCitation":"Kharaka, Y., Carothers, W., and Rosenbauer, R., 1983, Thermal decarboxylation of acetic acid: Implications for origin of natural gas: Geochimica et Cosmochimica Acta, v. 47, no. 3, p. 397-402, https://doi.org/10.1016/0016-7037(83)90262-4.","productDescription":"6 p.","startPage":"397","endPage":"402","numberOfPages":"6","costCenters":[],"links":[{"id":221747,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"47","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bb21ce4b08c986b3255de","contributors":{"authors":[{"text":"Kharaka, Y.K.","contributorId":23568,"corporation":false,"usgs":true,"family":"Kharaka","given":"Y.K.","email":"","affiliations":[],"preferred":false,"id":360847,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Carothers, W.W.","contributorId":43803,"corporation":false,"usgs":true,"family":"Carothers","given":"W.W.","email":"","affiliations":[],"preferred":false,"id":360849,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Rosenbauer, R.J.","contributorId":37320,"corporation":false,"usgs":true,"family":"Rosenbauer","given":"R.J.","email":"","affiliations":[],"preferred":false,"id":360848,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70011331,"text":"70011331 - 1983 - HIGH-TEMPERATURE GEOTHERMAL RESOURCES IN HYDROTHERMAL CONVECTION SYSTEMS IN THE UNITED STATES.","interactions":[],"lastModifiedDate":"2012-03-12T17:18:28","indexId":"70011331","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"HIGH-TEMPERATURE GEOTHERMAL RESOURCES IN HYDROTHERMAL CONVECTION SYSTEMS IN THE UNITED STATES.","docAbstract":"The calculation of high-temperature geothermal resources ( greater than 150 degree C) in the United States has been done by estimating the temperature, area, and thickness of each identified system. These data, along with a general model for recoverability of geothermal energy and a calculation that takes account of the conversion of thermal energy to electricity, yielded an estimate of 23,000 MW//e for 30 years. The undiscovered component was estimated based on multipliers of the identified resource as either 72,000 or 127,000 MW//e for 30 years depending on the model chosen for the distribution of undiscovered energy as a function of temperature.","largerWorkTitle":"Electric Power Research Institute, Advanced Power Systems Division, (Report) EPRI AP","conferenceTitle":"Proceedings - Seventh Annual Geothermal Conference and Workshop.","conferenceLocation":"San Diego, CA, USA","language":"English","publisher":"EPRI","publisherLocation":"Palo Alto, CA, USA","usgsCitation":"Nathenson, M., 1983, HIGH-TEMPERATURE GEOTHERMAL RESOURCES IN HYDROTHERMAL CONVECTION SYSTEMS IN THE UNITED STATES., <i>in</i> Electric Power Research Institute, Advanced Power Systems Division, (Report) EPRI AP, San Diego, CA, USA.","costCenters":[],"links":[{"id":220699,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a2e7ee4b0c8380cd5c5c6","contributors":{"authors":[{"text":"Nathenson, Manuel 0000-0002-5216-984X mnathnsn@usgs.gov","orcid":"https://orcid.org/0000-0002-5216-984X","contributorId":1358,"corporation":false,"usgs":true,"family":"Nathenson","given":"Manuel","email":"mnathnsn@usgs.gov","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":360855,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70011332,"text":"70011332 - 1983 - Snow and ice in a changing hydrological world","interactions":[],"lastModifiedDate":"2024-01-22T16:20:10.42955","indexId":"70011332","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1927,"text":"Hydrological Sciences Journal","active":true,"publicationSubtype":{"id":10}},"title":"Snow and ice in a changing hydrological world","docAbstract":"<p><span>On the occasion of the 60th anniversary of the International Association of Hydrological Sciences, the 100th and 50th anniversaries of the First and Second International Polar Years, and the 25th anniversary of the International Geophysical Year, it seems appropriate to re-examine the world's water balance and the role of snow and ice in the global hydrological climatic system. Snow cover on land (especially in the Northern Hemisphere) and sea ice (especially in the Southern Hemisphere) vary seasonally, and this seasonal change has an important effect on the world climate because snow and sea ice reflect solar radiation efficiently and affect other heat flow processes between atmosphere and land or ocean. Glaciers, including ice sheets, store most of the fresh water on Earth, but change dimensions relatively slowly. There is no clear evidence that the glacier ice volume currently is declining, but more needs to be known about mountain glacier and ice sheet mass balances. The current rise in sea level poses an enigma: thermal expansion of the oceans may account for half of the present rise, but the other half is unexplained. Although major changes in the large ice sheets take place over time scales of 10</span><sup>4</sup><span>&nbsp;to 10</span><sup>5</sup><span>&nbsp;years, marine ice sheets may be subject to rapid disintegration due to grounding line instability, perhaps accompanied by surging. Ice cores may produce remarkably complete histories of air temperature, precipitation, fallout, and atmospheric composition. A recent core through the Greenland Ice Sheet shows an abrupt transition from glacial to modern climate just over 10000 years ago, suggesting that climate is an “almost intransitive” system. Because of the possibility of abrupt climate transitions and the uncertain stability of the West Antarctic Ice Sheet, future climatic variations are difficult to predict. The calculated heating of the atmosphere in the polar regions due to CO</span><sub>2</sub><span>&nbsp;increase is, therefore, of special interest.</span></p>","language":"English","publisher":"Taylor & Francis","doi":"10.1080/02626668309491140","usgsCitation":"Meier, M.F., 1983, Snow and ice in a changing hydrological world: Hydrological Sciences Journal, v. 28, no. 1, p. 3-22, https://doi.org/10.1080/02626668309491140.","productDescription":"20 p.","startPage":"3","endPage":"22","numberOfPages":"20","costCenters":[],"links":[{"id":480236,"rank":2,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1080/02626668309491140","text":"Publisher Index Page"},{"id":220700,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"28","issue":"1","noUsgsAuthors":false,"publicationDate":"2009-12-24","publicationStatus":"PW","scienceBaseUri":"505b91b1e4b08c986b319a33","contributors":{"authors":[{"text":"Meier, M. F.","contributorId":98713,"corporation":false,"usgs":true,"family":"Meier","given":"M.","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":360856,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70011334,"text":"70011334 - 1983 - Mapping the earthquake hazards of the Los Angeles region.","interactions":[],"lastModifiedDate":"2012-03-12T17:18:29","indexId":"70011334","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1435,"text":"Earthquake Information Bulletin (USGS)","active":true,"publicationSubtype":{"id":10}},"title":"Mapping the earthquake hazards of the Los Angeles region.","docAbstract":"Discusses examples of fault, shaking and ground-failure hazards taken from recent studies of the Los Angeles region. These should provide an improved basis for delineating geographic variations in local earthquake hazards. -M.Barrett","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Earthquake Information Bulletin (USGS)","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","usgsCitation":"Ziony, J., and Tinsley, J.C., 1983, Mapping the earthquake hazards of the Los Angeles region.: Earthquake Information Bulletin (USGS), v. 15, no. 4, p. 134-141.","startPage":"134","endPage":"141","numberOfPages":"8","costCenters":[],"links":[{"id":220702,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"15","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a507fe4b0c8380cd6b713","contributors":{"authors":[{"text":"Ziony, J. I.","contributorId":24755,"corporation":false,"usgs":true,"family":"Ziony","given":"J. I.","affiliations":[],"preferred":false,"id":360858,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Tinsley, J. C.","contributorId":65827,"corporation":false,"usgs":true,"family":"Tinsley","given":"J.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":360859,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70011336,"text":"70011336 - 1983 - Characteristics of resuspended sediment from Georges Bank collected with a sediment trap","interactions":[],"lastModifiedDate":"2017-11-05T09:19:33","indexId":"70011336","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1587,"text":"Estuarine, Coastal and Shelf Science","active":true,"publicationSubtype":{"id":10}},"title":"Characteristics of resuspended sediment from Georges Bank collected with a sediment trap","docAbstract":"<p>A sediment trap was deployed 3 m from the bottom at a water depth of 62 m on the southern flank of Georges Bank (41°02·2′N, 67°33·5′W) from 30 September 1978 to 10 March 1979 to qualitatively determine the size of sediments resuspended from the bottom by winter storms and to determine if seasonal changes in the phytoplankton could be observed in the trapped sediment.</p><p>Bulk X-ray analyses of the trapped sediment showed layers of distinctly different textures preserved in the collection vessel. The median grain size of sampled layers ranged from 2·7 to 6·5 φ (fine sand to silt), but all layers contained a pronounced mode in the 3 φ (fine sand) range. Nine layers containing relatively large amounts of sand were present. The sand content was 75% in the coarest layers and about 32% in the fine layers. The median grain size of bottom sediments at the deployment site was considerably coarser than the trap samples, although the dominant grain size was also 3 φ.</p><p>Average bottom-current speeds during the deployment period were about 30 cm s<sup>−1</sup><span>&nbsp;</span>with a range of 10 to 50 cm s<sup>−1</sup>. Bottom stress, computed from the observed currents and waves, suggest that 11 storms caused sufficient stress to resuspend 3 φ-sized sediments, in good agreement with the nine layers of relatively coarse sediments collected in the trap. Surface waves had to be included in the calculation of bottom stress because the bottom currents alone were insufficient to cause the resuspension of 3 φ-sized sediment.</p><p>The trapped sediments contain numerous diatoms and coccoliths that are typical of late fall and winter assemblages. No clear seasonal difference in the flora was noted among sampled layers, probably due to the large influx of resuspended material and a reduced primary flux during this period. An undescribed species of<span>&nbsp;</span><i>Thalassiosira</i><span>&nbsp;</span>(G. Fryxell, personal communication), and siliceous scales of unknown systematic position were observed at all levels.</p>","language":"English","publisher":"Elsevier","doi":"10.1016/0272-7714(83)90004-5","issn":"02727714","usgsCitation":"Parmenter, C., Bothner, M., and Butman, B., 1983, Characteristics of resuspended sediment from Georges Bank collected with a sediment trap: Estuarine, Coastal and Shelf Science, v. 17, no. 5, p. 521-533, https://doi.org/10.1016/0272-7714(83)90004-5.","productDescription":"13 p.","startPage":"521","endPage":"533","costCenters":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":220764,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"Georges Bank ","volume":"17","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f49de4b0c8380cd4be05","contributors":{"authors":[{"text":"Parmenter, C.M.","contributorId":43740,"corporation":false,"usgs":true,"family":"Parmenter","given":"C.M.","email":"","affiliations":[],"preferred":false,"id":360862,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bothner, Michael H. mbothner@usgs.gov","contributorId":139855,"corporation":false,"usgs":true,"family":"Bothner","given":"Michael H.","email":"mbothner@usgs.gov","affiliations":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":false,"id":360863,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Butman, B.","contributorId":85580,"corporation":false,"usgs":true,"family":"Butman","given":"B.","email":"","affiliations":[],"preferred":false,"id":360864,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70011338,"text":"70011338 - 1983 - Euler-Lagrangian computation for estuarine hydrodynamics","interactions":[],"lastModifiedDate":"2016-07-27T10:37:23","indexId":"70011338","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Euler-Lagrangian computation for estuarine hydrodynamics","docAbstract":"<p>The transport of conservative and suspended matter in fluid flows is a phenomenon of Lagrangian nature because the process is usually convection dominant. Nearly all numerical investigations of such problems use an Eulerian formulation for the convenience that the computational grids are fixed in space and because the vast majority of field data are collected in an Eulerian reference frame. Several examples are given in this paper to illustrate a modeling approach which combines the advantages of both the Eulerian and Lagrangian computational techniques.</p>","largerWorkTitle":"Numerical Methods in Laminar and Turbulent Flow, Proceedings of the International Conference","conferenceTitle":"Numerical Methods in Laminar and Turbulent Flow, Proceedings of the Third International Conference.","conferenceLocation":"Seattle, WA","language":"English","publisher":"Pineridge Press","publisherLocation":"Swansea, Wa","isbn":"0906674220","usgsCitation":"Cheng, R.T., 1983, Euler-Lagrangian computation for estuarine hydrodynamics, <i>in</i> Numerical Methods in Laminar and Turbulent Flow, Proceedings of the International Conference, Seattle, WA, p. 341-352.","startPage":"341","endPage":"352","numberOfPages":"12","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":552,"text":"San Francisco Bay-Delta","active":false,"usgs":true},{"id":5079,"text":"Pacific Regional Director's Office","active":true,"usgs":true}],"links":[{"id":220766,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0469e4b0c8380cd50980","contributors":{"authors":[{"text":"Cheng, Ralph T.","contributorId":69134,"corporation":false,"usgs":true,"family":"Cheng","given":"Ralph","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":360866,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70011340,"text":"70011340 - 1983 - Variable tolerance to copper in two species from San Francisco Bay","interactions":[],"lastModifiedDate":"2020-01-26T09:47:13","indexId":"70011340","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2664,"text":"Marine Environmental Research","active":true,"publicationSubtype":{"id":10}},"title":"Variable tolerance to copper in two species from San Francisco Bay","docAbstract":"<p>In static toxicity experiments, tolerance to soluble Cu of the bivalve, Macoma balthica, and the copepod, Acartia clausi, varied substantially among populations sampled within San Francisco Bay. Intraspecific tolerance differed ten-fold or more for both species over relatively small distances, suggesting geographical isolation of populations is not a prerequisite for the development of intraspecific differences in tolerance by aquatic organisms.In static toxicity experiments, tolerance to soluble Cu of the bivalve, Macoma balthica, and the copepod, Acartia clausi, varied substantially among populations sampled within San Francisco Bay. Intraspecific tolerance differed ten-fold or more for both species over relatively small distances, suggesting geographical isolation of populations is not a prerequisite for the development of intraspecific differences in tolerance by aquatic organisms.&nbsp;</p>","language":"English","publisher":"Elsevier","doi":"10.1016/0141-1136(83)90002-8","issn":"01411136","usgsCitation":"Luoma, S.N., Cain, D., Ho, K., and Hutchinson, A., 1983, Variable tolerance to copper in two species from San Francisco Bay: Marine Environmental Research, v. 10, no. 4, p. 209-222, https://doi.org/10.1016/0141-1136(83)90002-8.","productDescription":"14 p.","startPage":"209","endPage":"222","numberOfPages":"14","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":552,"text":"San Francisco Bay-Delta","active":false,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true},{"id":5079,"text":"Pacific Regional Director's Office","active":true,"usgs":true}],"links":[{"id":220831,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California ","otherGeospatial":"San Francisco Bay","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -123.37646484374999,\n              37.07271048132943\n            ],\n            [\n              -121.728515625,\n              37.07271048132943\n            ],\n            [\n              -121.728515625,\n              38.41055825094609\n            ],\n            [\n              -123.37646484374999,\n              38.41055825094609\n            ],\n            [\n              -123.37646484374999,\n              37.07271048132943\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","volume":"10","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bc148e4b08c986b32a4ef","contributors":{"authors":[{"text":"Luoma, Samuel N. 0000-0001-5443-5091 snluoma@usgs.gov","orcid":"https://orcid.org/0000-0001-5443-5091","contributorId":2287,"corporation":false,"usgs":true,"family":"Luoma","given":"Samuel","email":"snluoma@usgs.gov","middleInitial":"N.","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":true,"id":780293,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Cain, D.J.","contributorId":68329,"corporation":false,"usgs":true,"family":"Cain","given":"D.J.","email":"","affiliations":[],"preferred":false,"id":360875,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Ho, K.","contributorId":18509,"corporation":false,"usgs":true,"family":"Ho","given":"K.","email":"","affiliations":[],"preferred":false,"id":360874,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Hutchinson, A.","contributorId":94035,"corporation":false,"usgs":true,"family":"Hutchinson","given":"A.","email":"","affiliations":[],"preferred":false,"id":360877,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70011341,"text":"70011341 - 1983 - The role of digital cartographic data in the geosciences","interactions":[],"lastModifiedDate":"2013-01-21T15:49:53","indexId":"70011341","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1315,"text":"Computers & Geosciences","printIssn":"0098-3004","active":true,"publicationSubtype":{"id":10}},"title":"The role of digital cartographic data in the geosciences","docAbstract":"The increasing demand of the Nation's natural resource developers for the manipulation, analysis, and display of large quantities of earth-science data has necessitated the use of computers and the building of geoscience information systems. These systems require, in digital form, the spatial data on map products. The basic cartographic data shown on quadrangle maps provide a foundation for the addition of geological and geophysical data. If geoscience information systems are to realize their full potential, large amounts of digital cartographic base data must be available. A major goal of the U.S. Geological Survey is to create, maintain, manage, and distribute a national cartographic and geographic digital database. This unified database will contain numerous categories (hydrography, hypsography, land use, etc.) that, through the use of standardized data-element definitions and formats, can be used easily and flexibly to prepare cartographic products and perform geoscience analysis. ?? 1983.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Computers and Geosciences","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Elsevier","publisherLocation":"Amsterdam, Netherlands","doi":"10.1016/0098-3004(83)90032-8","issn":"00983004","usgsCitation":"Guptill, S., 1983, The role of digital cartographic data in the geosciences: Computers & Geosciences, v. 9, no. 1, p. 23-26, https://doi.org/10.1016/0098-3004(83)90032-8.","startPage":"23","endPage":"26","numberOfPages":"4","costCenters":[],"links":[{"id":266192,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/0098-3004(83)90032-8"},{"id":220832,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"9","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505baf66e4b08c986b324772","contributors":{"authors":[{"text":"Guptill, S.C.","contributorId":84417,"corporation":false,"usgs":true,"family":"Guptill","given":"S.C.","email":"","affiliations":[],"preferred":false,"id":360878,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70011342,"text":"70011342 - 1983 - Nucleation and growth of strike slip faults in granite","interactions":[],"lastModifiedDate":"2024-06-28T16:39:27.307299","indexId":"70011342","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":6453,"text":"Journal of Geophysical Research Solid Earth","active":true,"publicationSubtype":{"id":10}},"title":"Nucleation and growth of strike slip faults in granite","docAbstract":"<p><span>Fractures within granodiorite of the central Sierra Nevada, California, were studied to elucidate the mechanics of faulting in crystalline rocks, with emphasis on the nucleation of new fault surfaces and their subsequent propagation and growth. Within the study area the fractures form a single, subparallel array which strikes N50°–70°E and dips steeply to the south. Some of these fractures are identified as joints because displacements across the fracture surfaces exhibit dilation but no slip. The joints are filled with undeformed minerals, including epidote and chlorite. Other fractures are identified as small faults because they display left-lateral strike slip separations of up to 2 m. Slickensides, developed on fault surfaces, plunge 0°–20° to the east. The faults occur parallel to, and in the same outcrop with, the joints. The faults are filled with epidote, chlorite, and quartz, which exhibit textural evidence of shear deformation. These observations indicate that the strike slip faults nucleated on earlier formed, mineral-filled joints. Secondary, dilational fractures propagated from near the ends of some small faults contemporaneously with the left-lateral slip on the faults. These fractures trend 25°±10° from the fault planes, parallel to the direction of inferred local maximum compressive stress. The faults did not propagate into intact rock in their own planes as shear fractures. Rather, adjacent faults were linked together by secondary, dilational fractures. Extensive secondary fracturing between faults produced larger fault zones that accommodate 10–100 m of left-lateral slip. As deformation progressed, faulting evolved from relatively short, closely spaced faults to longer, more widely spaced fault zones.</span></p>","language":"English","publisher":"American Geophysical Union","doi":"10.1029/JB088iB01p00555","issn":"01480227","usgsCitation":"Segall, P., and Pollard, D., 1983, Nucleation and growth of strike slip faults in granite: Journal of Geophysical Research Solid Earth, v. 88, no. B1, p. 555-568, https://doi.org/10.1029/JB088iB01p00555.","productDescription":"14 p.","startPage":"555","endPage":"568","numberOfPages":"14","costCenters":[],"links":[{"id":220833,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"88","issue":"B1","noUsgsAuthors":false,"publicationDate":"2012-09-20","publicationStatus":"PW","scienceBaseUri":"505a68d5e4b0c8380cd73a06","contributors":{"authors":[{"text":"Segall, P.","contributorId":44231,"corporation":false,"usgs":false,"family":"Segall","given":"P.","affiliations":[],"preferred":false,"id":360880,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Pollard, D.P.","contributorId":7000,"corporation":false,"usgs":true,"family":"Pollard","given":"D.P.","email":"","affiliations":[],"preferred":false,"id":360879,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70011343,"text":"70011343 - 1983 - Hole-to-surface resistivity measurements","interactions":[],"lastModifiedDate":"2024-04-18T16:33:06.528328","indexId":"70011343","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1808,"text":"Geophysics","active":true,"publicationSubtype":{"id":10}},"title":"Hole-to-surface resistivity measurements","docAbstract":"<p><span>Hole-to-surface resistivity measurements over a layered volcanic tuff sequence illustrate procedures for gathering, reducing, and interpreting hole-to-surface resistivity data. The magnitude and direction of the total surface electric field resulting from a buried current source is calculated from orthogonal potential difference measurements for a grid of closely spaced stations. A contour map of these data provides a detailed map of the distribution of the electric field away from the drill hole. Resistivity anomalies can be enhanced by calculating the difference between apparent resistivities calculated from the total surface electric field and apparent resistivities for a layered earth model.Lateral discontinutities in the geoelectric section are verified by repeating the surface field measurments for current sources in several drill holes. A qualitative interpretation of the anomalous bodies within a layered earth can be made by using a three-dimensional (3-D) resistivity model in a homogeneous half-space. The general nature of resistive and conductive bodies causing anomalies away from the source drill holes is determined with the aid of data from several source holes, layered models, and 3-D models.</span></p>","language":"English","publisher":"Society of Exploration Geophysicists","doi":"10.1190/1.1441410","issn":"00168033","usgsCitation":"Daniels, J., 1983, Hole-to-surface resistivity measurements: Geophysics, v. 48, no. 1, p. 87-97, https://doi.org/10.1190/1.1441410.","productDescription":"11 p.","startPage":"87","endPage":"97","numberOfPages":"11","costCenters":[],"links":[{"id":220896,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"48","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a31cee4b0c8380cd5e243","contributors":{"authors":[{"text":"Daniels, J.J.","contributorId":75929,"corporation":false,"usgs":true,"family":"Daniels","given":"J.J.","email":"","affiliations":[],"preferred":false,"id":360881,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70011566,"text":"70011566 - 1983 - Preparing a Detailed Landslide-Inventory Map for Hazard Evaluation and Reduction","interactions":[],"lastModifiedDate":"2023-11-03T00:52:54.226482","indexId":"70011566","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1115,"text":"Bulletin of the Association of Engineering Geologists","active":true,"publicationSubtype":{"id":10}},"title":"Preparing a Detailed Landslide-Inventory Map for Hazard Evaluation and Reduction","docAbstract":"A method of preparing a detailed landslide-inventory map has been developed which provides the engineering geologist with the basic information for evaluating and reducing landslide hazards or risk on a regional or community level. For each landslide, the map depicts state of activity, certainty of identification, dominant type of slope movement, primary direction of movement, estimated thickness of material involved in landsliding, and date(s) of known activity. This information is developed from interpreting aerial photographs and examining landslide features in the field. Although preparing detailed landslide-inventory maps involves considerably more time and effort than landslide reconnaissance mapping, these maps are directly useable by planners and decisionmakers as a basis for requiring site-specific investigations prior to development or adopting land-use regulations. Refs.","language":"English","publisher":"Association of Engineering Geologists","doi":"10.2113/gseegeosci.xxi.3.337","issn":"00045691","usgsCitation":"Wieczorek, G.F., 1983, Preparing a Detailed Landslide-Inventory Map for Hazard Evaluation and Reduction: Bulletin of the Association of Engineering Geologists, v. 21, no. 3, p. 337-342, https://doi.org/10.2113/gseegeosci.xxi.3.337.","productDescription":"6 p.","startPage":"337","endPage":"342","numberOfPages":"6","costCenters":[],"links":[{"id":221242,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"21","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a7373e4b0c8380cd7703b","contributors":{"authors":[{"text":"Wieczorek, Gerald F.","contributorId":81889,"corporation":false,"usgs":true,"family":"Wieczorek","given":"Gerald","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":361417,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70011348,"text":"70011348 - 1983 - Submarine hydrothermal metamorphism of the Del Puerto ophiolite, California","interactions":[],"lastModifiedDate":"2023-02-08T17:56:18.22437","indexId":"70011348","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":732,"text":"American Journal of Science","active":true,"publicationSubtype":{"id":10}},"title":"Submarine hydrothermal metamorphism of the Del Puerto ophiolite, California","docAbstract":"<p>No abstract available.</p>","language":"English","publisher":"American Journal of Science","doi":"10.2475/ajs.283.4.289","usgsCitation":"Evarts, R.C., and Schiffman, P., 1983, Submarine hydrothermal metamorphism of the Del Puerto ophiolite, California: American Journal of Science, v. 283, no. 4, p. 289-340, https://doi.org/10.2475/ajs.283.4.289.","productDescription":"52 p.","startPage":"289","endPage":"340","numberOfPages":"52","costCenters":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":480234,"rank":2,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.2475/ajs.283.4.289","text":"Publisher Index Page"},{"id":220901,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","otherGeospatial":"Del Puerto ophiolite","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"coordinates\": [\n          [\n            [\n              -121.30479833122857,\n              37.513758245858384\n            ],\n            [\n              -121.30479833122857,\n              37.434575381298416\n            ],\n            [\n              -121.18543480940622,\n              37.434575381298416\n            ],\n            [\n              -121.18543480940622,\n              37.513758245858384\n            ],\n            [\n              -121.30479833122857,\n              37.513758245858384\n            ]\n          ]\n        ],\n        \"type\": \"Polygon\"\n      }\n    }\n  ]\n}","volume":"283","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b9d29e4b08c986b31d69c","contributors":{"authors":[{"text":"Evarts, Russell C. revarts@usgs.gov","contributorId":1974,"corporation":false,"usgs":true,"family":"Evarts","given":"Russell","email":"revarts@usgs.gov","middleInitial":"C.","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":true,"id":360888,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Schiffman, Peter","contributorId":40119,"corporation":false,"usgs":true,"family":"Schiffman","given":"Peter","email":"","affiliations":[],"preferred":false,"id":360887,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70011349,"text":"70011349 - 1983 - Introduction: seismology and earthquake engineering in Central and South America.","interactions":[],"lastModifiedDate":"2012-03-12T17:18:28","indexId":"70011349","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1435,"text":"Earthquake Information Bulletin (USGS)","active":true,"publicationSubtype":{"id":10}},"title":"Introduction: seismology and earthquake engineering in Central and South America.","docAbstract":"Reports the state-of-the-art in seismology and earthquake engineering that is being advanced in Central and South America. Provides basic information on seismological station locations in Latin America and some of the programmes in strong-motion seismology, as well as some of the organizations involved in these activities.-from Author","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Earthquake Information Bulletin (USGS)","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","usgsCitation":"Espinosa, A.F., 1983, Introduction: seismology and earthquake engineering in Central and South America.: Earthquake Information Bulletin (USGS), v. 15, no. 1, p. 4-6.","startPage":"4","endPage":"6","numberOfPages":"3","costCenters":[],"links":[{"id":220972,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"15","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a3e0ee4b0c8380cd63a7c","contributors":{"authors":[{"text":"Espinosa, A. F.","contributorId":63782,"corporation":false,"usgs":true,"family":"Espinosa","given":"A.","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":360889,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70011351,"text":"70011351 - 1983 - Can the earth be dated from decay of its magnetic field?.","interactions":[],"lastModifiedDate":"2024-05-07T16:38:26.184541","indexId":"70011351","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2307,"text":"Journal of Geological Education","active":true,"publicationSubtype":{"id":10}},"title":"Can the earth be dated from decay of its magnetic field?.","docAbstract":"<p class=\"first\">Thomas G. Barnes, Emeritus Professor of Physics at the University of Texas, El Paso, and a creationist, argues that the geomagnetic field was created by unknown processes at the time of creation of the earth and has been decaying irreversibly and exponentially, with a half-life of about 1400 years, since then. He calculates that the field would have been impossibly large in 8000 B.C. and concludes that the earth, therefore, is less than 10,000 years old. He denies that the earth's field has reversed polarity in the past, and attempts to refute the dynamo theory of the origin of the field. Barnes' arguments and conclusions are commonly cited in creationist literature as definitive proof that the earth is very young. Barnes is wrong, and has ignored or misrepresented much of the data on the earth's magnetic field.</p><p>Barnes calculations are based on observatory measurements showing that the earth's dipole field strength has decreased since 1835. But these same measurements also show a corresponding increase in the strength of the nondipole field so that the total field energy external to the core has remained about constant. Paleomagnetic evidence shows that the earth's field has existed for more than three billion years, and that the dipole field both fluctuates in strength and irregularly reverses polarity. The earth's field is generated by a fluid dynamo in the iron-nickel core; all of the elements necessary for a dynamo, including fluid motion and energy sources, are present. Contrary to Barnes' assertions, there are no theoretical reasons why a dynamo cannot exist in the earth.</p><p class=\"last\">There are no properties of the magnetid field that can be used to place an upper limit on the earth's age.</p>","language":"English","publisher":"Taylor & Francis","doi":"10.5408/0022-1368-31.2.124","issn":"00221368","usgsCitation":"Dalrymple, G.B., 1983, Can the earth be dated from decay of its magnetic field?.: Journal of Geological Education, v. 31, no. 2, p. 124-133, https://doi.org/10.5408/0022-1368-31.2.124.","productDescription":"10 p.","startPage":"124","endPage":"133","numberOfPages":"10","costCenters":[],"links":[{"id":480230,"rank":2,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.5408/0022-1368-31.2.124","text":"Publisher Index Page"},{"id":220974,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"31","issue":"2","noUsgsAuthors":false,"publicationDate":"2018-02-13","publicationStatus":"PW","scienceBaseUri":"5059f33be4b0c8380cd4b69b","contributors":{"authors":[{"text":"Dalrymple, G. B.","contributorId":10407,"corporation":false,"usgs":true,"family":"Dalrymple","given":"G.","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":360893,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70011352,"text":"70011352 - 1983 - Reinterpretation of the exposed record of the last two cycles of Lake Bonneville, Western United States","interactions":[],"lastModifiedDate":"2013-01-26T15:51:48","indexId":"70011352","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3218,"text":"Quaternary Research","active":true,"publicationSubtype":{"id":10}},"title":"Reinterpretation of the exposed record of the last two cycles of Lake Bonneville, Western United States","docAbstract":"A substantially modified history of the last two cycles of Lake Bonneville is proposed. The Bonneville lake cycle began prior to 26,000 yr B.P.; the lake reached the Bonneville shoreline about 16,000 yr B.P. Poor dating control limits our knowledge of the timing of subsequent events. Lake level was maintained at the Bonneville shoreline until about 15,000 yr B.P., or somewhat later, when catastrophic downcutting of the outlet caused a rapid drop of 100 m. The Provo shoreline was formed as rates of isostatic uplift due to this unloading slowed. By 13,000 yr B.P., the lake had fallen below the Provo level and reached one close to that of Great Salt Lake by 11,000 yr B.P. Deposits of the Little Valley lake cycle are identified by their position below a marked unconformity and by amino acid ratios of their fossil gastropods. The maximum level of the Little Valley lake was well below the Bonneville shoreline. Based on degree of soil development and other evidence, the Little Valley lake cycle may be equivalent in age to marine oxygenisotope stage 6. The proposed lake history has climatic implications for the region. First, because the fluctuations of Lake Bonneville and Lake Lahontan during the last cycle of each were apparently out of phase, there may have been significant local differences in the timing and character of late Pleistocene climate changes in the Great Basin. Second, although the Bonneville and Little Valley lake cycles were broadly synchronous with maximum episodes of glaciation, environmental conditions necessary to generate large lakes did not exist during early Wisconsin time. ?? 1983.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Quaternary Research","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Elsevier","publisherLocation":"Amsterdam, Netherlands","doi":"10.1016/0033-5894(83)90013-3","issn":"00335894","usgsCitation":"Scott, W.E., McCoy, W., Shroba, R., and Rubin, M., 1983, Reinterpretation of the exposed record of the last two cycles of Lake Bonneville, Western United States: Quaternary Research, v. 20, no. 3, p. 261-285, https://doi.org/10.1016/0033-5894(83)90013-3.","startPage":"261","endPage":"285","numberOfPages":"25","costCenters":[],"links":[{"id":266559,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/0033-5894(83)90013-3"},{"id":220975,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"20","issue":"3","noUsgsAuthors":false,"publicationDate":"2017-01-20","publicationStatus":"PW","scienceBaseUri":"50e4a60ce4b0e8fec6cdc086","contributors":{"authors":[{"text":"Scott, W. E.","contributorId":22773,"corporation":false,"usgs":true,"family":"Scott","given":"W.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":360895,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"McCoy, W.D.","contributorId":19165,"corporation":false,"usgs":true,"family":"McCoy","given":"W.D.","email":"","affiliations":[],"preferred":false,"id":360894,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Shroba, R. R.","contributorId":44133,"corporation":false,"usgs":true,"family":"Shroba","given":"R. R.","affiliations":[],"preferred":false,"id":360896,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Rubin, M.","contributorId":88079,"corporation":false,"usgs":true,"family":"Rubin","given":"M.","email":"","affiliations":[],"preferred":false,"id":360897,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70011353,"text":"70011353 - 1983 - Correlation of Alaskan varve thickness with climatic parameters, and use in paleoclimatic reconstruction","interactions":[],"lastModifiedDate":"2013-01-26T15:52:37","indexId":"70011353","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3218,"text":"Quaternary Research","active":true,"publicationSubtype":{"id":10}},"title":"Correlation of Alaskan varve thickness with climatic parameters, and use in paleoclimatic reconstruction","docAbstract":"The thickness of varves in the sediments of Skilak Lake, Alaska, are correlated with the mean annual temperature (r = 0.574), inversely correlated with the mean annual cumulative snowfall (r = -0.794), and not correlated with the mean annual precipitation (r = 0.202) of the southern Alaska climatological division for the years 1907-1934 A.D. Varve thickness in Skilak Lake is sensitive to annual temperature and snowfall because Skilak Glacier, the dominant source of sediment for Skilak Lake, is sensitive to these climatic parameters. Trends of varve thickness are well correlated with trends of mean annual cumulative snowfall (r = -0.902) of the southern Alaska climatological division and with trends of mean annual temperature of the southern (r = 0.831) and northern (r = 0.786) Alaska climatological divisions. Trends of varve thickness also correlate with trends of annual temperature in Seattle and North Head, Washington (r = 0.632 and 0.850, respectively). Comparisons of trends of varve thickness with trends of annual temperature in California, Oregon, and Washington suggest no widespread regional correlation. Trends of annual snowfall in the southern Alaska climatological division and trends of annual temperature in the southern and northern Alaska climatological divisions are reconstructed for the years 1700-1906 A.D. Climatic reconstructions on the basis of varve thickness in Skilak Lake utilize equations derived from the regression of series of smoothed climatological data on series of smoothed varve thickness. Reconstruction of trends of mean annual cunulative snowfall in the southern Alaska climatological division suggests that snowfall during the 1700s and 1800s was much greater than that during the early and mid-1900s. The periods 1770-1790 and 1890-1906 show marked decreases in the mean annual snowfall. Reconstructed trends of the annual temperature of the northern and southern Alaska climatological divisions suggest that annual temperatures during the 1700s and 1800s were lower than those of the early and mid-1900s. Two periods of relatively high annual temperatures coincide with the periods of low annual snowfall thus determined. ?? 1983.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Quaternary Research","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Elsevier","publisherLocation":"Amsterdam, Netherlands","doi":"10.1016/0033-5894(83)90015-7","issn":"00335894","usgsCitation":"Perkins, J., and Sims, J., 1983, Correlation of Alaskan varve thickness with climatic parameters, and use in paleoclimatic reconstruction: Quaternary Research, v. 20, no. 3, p. 308-321, https://doi.org/10.1016/0033-5894(83)90015-7.","startPage":"308","endPage":"321","numberOfPages":"14","costCenters":[],"links":[{"id":266560,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/0033-5894(83)90015-7"},{"id":221039,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"20","issue":"3","noUsgsAuthors":false,"publicationDate":"2017-01-20","publicationStatus":"PW","scienceBaseUri":"5059fc2ee4b0c8380cd4e175","contributors":{"authors":[{"text":"Perkins, J.A.","contributorId":49769,"corporation":false,"usgs":true,"family":"Perkins","given":"J.A.","email":"","affiliations":[],"preferred":false,"id":360899,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Sims, J.D.","contributorId":9230,"corporation":false,"usgs":false,"family":"Sims","given":"J.D.","email":"","affiliations":[],"preferred":false,"id":360898,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70011354,"text":"70011354 - 1983 - A quantitative comparison of Soil Development in four climatic regimes","interactions":[],"lastModifiedDate":"2013-01-26T15:53:47","indexId":"70011354","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3218,"text":"Quaternary Research","active":true,"publicationSubtype":{"id":10}},"title":"A quantitative comparison of Soil Development in four climatic regimes","docAbstract":"A new quantitative Soil Development Index based on field data has been applied to chronosequences formed under different climatic regimes. The four soil chronosequences, developed primarily on sandy deposits, have some numeric age control and are located in xeric-inland (Merced, Calif.), xeric-coastal (Ventura, Calif.), aridic (Las Cruces, N. Mex.), and udic (Susquehanna Valley, Pa.) soil-moisture regimes. To quantify field properties, points are assigned for developmental increases in soil properties in comparison to the parent material. Currently ten soil-field properties are quantified and normalized for each horizon in a given chronosequence, including two new properties for carbonate-rich soils in addition to the eight properties previously defined. When individual properties or the combined indexes are plotted as a function of numeric age, rates of soil development can be compared in different climates. The results demonstrate that (1) the Soil Development Index can be applied to very different soil types, (2) many field properties develop systematically in different climatic regimes, (3) certain properties appear to have similar rates of development in different climates, and (4) the Profile Index that combines different field properties increases significantly with age and appears to develop at similar rates in different climates. The Soil Development Index can serve as a preliminary guide to soil age where other age control is lacking and can be used to correlate deposits of different geographical and climatic regions. ?? 1983.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Quaternary Research","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Elsevier","publisherLocation":"Amsterdam, Netherlands","doi":"10.1016/0033-5894(83)90017-0","issn":"00335894","usgsCitation":"Harden, J., and Taylor, E.M., 1983, A quantitative comparison of Soil Development in four climatic regimes: Quaternary Research, v. 20, no. 3, p. 342-359, https://doi.org/10.1016/0033-5894(83)90017-0.","startPage":"342","endPage":"359","numberOfPages":"18","costCenters":[],"links":[{"id":266561,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/0033-5894(83)90017-0"},{"id":221040,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"20","issue":"3","noUsgsAuthors":false,"publicationDate":"2017-01-20","publicationStatus":"PW","scienceBaseUri":"5059e524e4b0c8380cd46b5f","contributors":{"authors":[{"text":"Harden, J.W. 0000-0002-6570-8259","orcid":"https://orcid.org/0000-0002-6570-8259","contributorId":38585,"corporation":false,"usgs":true,"family":"Harden","given":"J.W.","affiliations":[],"preferred":false,"id":360900,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Taylor, E. M.","contributorId":55842,"corporation":false,"usgs":true,"family":"Taylor","given":"E.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":360901,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70011356,"text":"70011356 - 1983 - Taeniolite, an uncommon lithium-mica from Coyote Peak, Humboldt County, California.","interactions":[],"lastModifiedDate":"2012-03-12T17:18:26","indexId":"70011356","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2749,"text":"Mineralogical Record","active":true,"publicationSubtype":{"id":10}},"title":"Taeniolite, an uncommon lithium-mica from Coyote Peak, Humboldt County, California.","docAbstract":"Taeniolite has been found in a late pegmatitic clot in a mafic alkalic diatreme at Coyote Peak; associated species are natrolite, pectolite, aegirine, barytolamprophyllite, rasvumite and sphalerite. The taeniolite is green-brown with sp. gr. (meas.) 2.85(1) and H. 31/2. Optically it is biaxial (-) with alpha 1.541(2), beta = gamma 1.570(2), 2V approx 0o and moderate pleochroism with gamma = beta reddish-brown, alpha pale greenish brown. Single-crystal precession photographs show it to be of the 1M type, with a 5.254(2), b 9.110(4), c 10.187(2) A, beta 99.85(4)o and V = 480.4(1) A3. Combined microprobe and ion probe analyses gave SiO2 53.5, Al2O3 3.00, TiO2 1.06, FeO 3.35, MnO 0.21, MgO 18.3, Li2O 2.4, K2O 11.3, Na2O 0.27, F 6.3 = 99.69; SrO and BaO are both <0.04 wt.%; B, Be, Ca and Cl were not detected. Assuming (F + OH) = 2 and assigning 1.30 wt.% H2O gives 409(K1.01Na0.04)(Al0.01Ti0.06Fe2+0.20Mn0.01Mg1.92Li0.68)(Si3.76Al0.24)O10- (F1.40OH0.60).-G.W.R.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Mineralogical Record","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","issn":"00264628","usgsCitation":"Erd, R.C., Czamanske, G., and Meyer, C., 1983, Taeniolite, an uncommon lithium-mica from Coyote Peak, Humboldt County, California.: Mineralogical Record, v. 14, no. 1, p. 39-40.","startPage":"39","endPage":"40","numberOfPages":"2","costCenters":[],"links":[{"id":221042,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"14","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505ba3b1e4b08c986b31fe11","contributors":{"authors":[{"text":"Erd, Richard C.","contributorId":89899,"corporation":false,"usgs":true,"family":"Erd","given":"Richard","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":360905,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Czamanske, G.K.","contributorId":26300,"corporation":false,"usgs":true,"family":"Czamanske","given":"G.K.","email":"","affiliations":[],"preferred":false,"id":360904,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Meyer, C.E.","contributorId":104023,"corporation":false,"usgs":true,"family":"Meyer","given":"C.E.","email":"","affiliations":[],"preferred":false,"id":360906,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70011358,"text":"70011358 - 1983 - Rainfall intensity-duration-frequency formulas.","interactions":[],"lastModifiedDate":"2013-03-16T07:56:29","indexId":"70011358","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2338,"text":"Journal of Hydraulic Engineering","active":true,"publicationSubtype":{"id":10}},"title":"Rainfall intensity-duration-frequency formulas.","docAbstract":"A new general rainfall intensity-duration-frequency formula is presented, utilizing a method similar to, but more accurate than one previously developed. The previously developed formula was based on the average depth-duration ratio of about 40% and the mean depth-frequency ratio of 1.48. It is shown that this formula is only a particular form of the writer's more general formulation. -from Author","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Hydraulic Engineering","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"ASCE","doi":"10.1061/(ASCE)0733-9429(1983)109:12(1603)","usgsCitation":"Chen, C., 1983, Rainfall intensity-duration-frequency formulas.: Journal of Hydraulic Engineering, v. 109, no. 12, p. 1603-1621, https://doi.org/10.1061/(ASCE)0733-9429(1983)109:12(1603).","startPage":"1603","endPage":"1621","numberOfPages":"19","costCenters":[],"links":[{"id":221107,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":269432,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1061/(ASCE)0733-9429(1983)109:12(1603)"}],"volume":"109","issue":"12","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a9460e4b0c8380cd8138d","contributors":{"authors":[{"text":"Chen, Chiu-Lan","contributorId":100979,"corporation":false,"usgs":true,"family":"Chen","given":"Chiu-Lan","email":"","affiliations":[],"preferred":false,"id":360909,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70011359,"text":"70011359 - 1983 - Distribution of mineral deposits in accreted terranes and cratonal rocks of western United States","interactions":[],"lastModifiedDate":"2023-09-26T13:43:14.493743","indexId":"70011359","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1168,"text":"Canadian Journal of Earth Sciences","active":true,"publicationSubtype":{"id":10}},"title":"Distribution of mineral deposits in accreted terranes and cratonal rocks of western United States","docAbstract":"<p><span>The western margin of the conterminous United States, covering roughly 300 000 mi</span><sup>2</sup><span>&nbsp;(777 000 km</span><sup>2</sup><span>), is an agglomeration of tectonostratigraphic terranes accreted to the North American craton mainly during Mesozoic time. The terranes represent a number of fundamental crustal types: oceanic crust, island-arc crust, mélange, various combinations of the preceding three, batholithic, miogeoclinal, and platform.The distribution patterns of types of mineral deposits show that miogeoclinal terranes of the craton are characterized by replacement and vein-type lead–zinc–silver, skarn tungsten deposits, molybdenum, and tin, whereas accreted terranes contain all the known volcanogenic massive sulfide deposits, all chromite and chert-associated manganese, and all the large gold quartz-vein deposits, except Goldfield, Nevada. Carlin-type disseminated fine-grained gold deposits occur mostly in windows of Paleozoic miogeoclinal rocks in Nevada, but the only known fine-grained gold deposit in California is in very youthful volcanic rocks overlying oceanic-crust terrane. Large bedded-type barite deposits, although in the same general area and showing the same general trend as fine disseminated gold deposits in Nevada, are in allochthonous oceanic terrane. Mercury and antimony are dominantly in accreted terranes but antimony, in particular, also forms important deposits in cratonal rocks. Most of the large iron deposits are in the craton but a few are in accreted island-arc terranes.</span></p>","language":"English","publisher":"Canadian Science Publishing","doi":"10.1139/e83-092","issn":"00084077","usgsCitation":"Albers, J.P., 1983, Distribution of mineral deposits in accreted terranes and cratonal rocks of western United States: Canadian Journal of Earth Sciences, v. 20, no. 6, p. 1019-1029, https://doi.org/10.1139/e83-092.","productDescription":"11 p.","startPage":"1019","endPage":"1029","costCenters":[],"links":[{"id":221108,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California, Idaho, Nevada, Oregon, Utah, Washington","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"coordinates\": [\n          [\n            [\n              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P.","contributorId":81505,"corporation":false,"usgs":true,"family":"Albers","given":"J.","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":360910,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70011362,"text":"70011362 - 1983 - The isotopic and chemical evolution of Mount St. Helens","interactions":[],"lastModifiedDate":"2023-12-10T22:02:32.258171","indexId":"70011362","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1427,"text":"Earth and Planetary Science Letters","active":true,"publicationSubtype":{"id":10}},"title":"The isotopic and chemical evolution of Mount St. Helens","docAbstract":"<div id=\"abstracts\" class=\"Abstracts u-font-serif text-s\"><div id=\"ab1\" class=\"abstract author\" lang=\"en\"><div id=\"aep-abstract-sec-id7\"><p>Isotopic and major and trace element analysis of nine samples of eruptive products spanning the history of the Mt. St. Helens volcano suggest three different episodes; (1) 40,000–2500 years ago: eruptions of dacite with<span>&nbsp;</span><i>ε<sub>Nd</sub><span>&nbsp;</span>= +5</i>,<span>&nbsp;</span><i>ε<sub>Sr</sub><span>&nbsp;</span>= −10</i>, variable<span>&nbsp;</span><i>δ<sup>18</sup>O</i>,<sup>206</sup>Pb/<sup>204</sup>Pb ∼ 18.76, Ca/Sr ∼ 60, Rb/Ba ∼ 0.1, La/Yb ∼ 18, (2) 2500-1000 years ago: eruptions of basalt, andesite and dacite with<span>&nbsp;</span><i>ε<sub>Nd</sub><span>&nbsp;</span>= +4 to +8, ε<sub>Sr</sub><span>&nbsp;</span>= −7 to −22</i>, variable<span>&nbsp;</span><i>δ<sup>18</sup>O</i><span>&nbsp;</span>(thought to represent melting of differing mantle-crust reservoirs),<span>&nbsp;</span><i><sup>206</sup>Pb/<sup>204</sup>Pb= 18.81−18.87</i>, variable Ca/Sr, Rb/Ba, La/Yb and high Zr, (3) 1000 years ago to present day: eruptions of andesite and dacite with<span>&nbsp;</span><i>ε<sub>Nd</sub><span>&nbsp;</span>= +6, ε<sub>Sr</sub><span>&nbsp;</span>= −13, δ<sup>18</sup>O∼6‰</i>, variable<sup>206</sup>Pb/<sup>204</sup>Pb, Ca/Sr ∼ 77,<span>&nbsp;</span><i>Rb/Ba= 0.1</i>, La/Yb ∼ 11. None of the products exhibit Eu anomalies and all are LREE enriched. There is a strong correlation between<sup>87</sup>Sr/<sup>86</sup>Sr and differentiation indices. These data are interpreted in terms of a mantle heat source melting young crust bearing zircon and garnet, but not feldspar, followed by intrusion of this crustal reservoir by mantle-derived magma which caused further crustal melting and contaminated the crustal magma system with mafic components. Since 1000 years ago all the eruptions have been from the same reservoir which has displayed a much more gradual re-equilibration of Pb isotopic compositions than other components suggesting that Pb is being transported via a fluid phase. The Nd and Sr isotopic compositions lie along the mantle array and suggest that the mantle underneath Mt. St. Helens is not as depleted as MORB sources. There is no indication of seawater involvement in the source region.</p></div></div></div>","language":"English","publisher":"Elsevier","doi":"10.1016/0012-821X(83)90040-7","issn":"0012821X","usgsCitation":"Halliday, A.N., Fallick, A., Dickin, A., Mackenzie, A., Stephens, W., and Hildreth, W., 1983, The isotopic and chemical evolution of Mount St. Helens: Earth and Planetary Science Letters, v. 63, no. 2, p. 241-256, https://doi.org/10.1016/0012-821X(83)90040-7.","productDescription":"16 p.","startPage":"241","endPage":"256","numberOfPages":"16","costCenters":[],"links":[{"id":221167,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"63","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bad6be4b08c986b323bd0","contributors":{"authors":[{"text":"Halliday, A. N.","contributorId":87663,"corporation":false,"usgs":true,"family":"Halliday","given":"A.","email":"","middleInitial":"N.","affiliations":[],"preferred":false,"id":360918,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Fallick, A.E.","contributorId":55575,"corporation":false,"usgs":true,"family":"Fallick","given":"A.E.","affiliations":[],"preferred":false,"id":360916,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Dickin, A.P.","contributorId":28008,"corporation":false,"usgs":true,"family":"Dickin","given":"A.P.","affiliations":[],"preferred":false,"id":360915,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Mackenzie, A.B.","contributorId":64387,"corporation":false,"usgs":true,"family":"Mackenzie","given":"A.B.","email":"","affiliations":[],"preferred":false,"id":360917,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Stephens, W.E.","contributorId":24917,"corporation":false,"usgs":true,"family":"Stephens","given":"W.E.","email":"","affiliations":[],"preferred":false,"id":360914,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Hildreth, W. 0000-0002-7925-4251","orcid":"https://orcid.org/0000-0002-7925-4251","contributorId":100487,"corporation":false,"usgs":true,"family":"Hildreth","given":"W.","affiliations":[],"preferred":false,"id":360919,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}}
,{"id":70011364,"text":"70011364 - 1983 - Tectonics and metallogenic provinces","interactions":[],"lastModifiedDate":"2019-12-19T08:45:04","indexId":"70011364","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":661,"text":"Advances in Space Research","active":true,"publicationSubtype":{"id":10}},"title":"Tectonics and metallogenic provinces","docAbstract":"Various theories have been advanced to explain the well-known uneven distribution of metals and ore-deposit types in space and time. Primordial differences in the mantle, preferential concentration of elements in the crust, the prevalence of ore-forming processes at certain times and (or) places, and combinations of one or several of these factors have all been called upon to account for the \"metallogenic provinces,\" which can be defined loosely as regions containing similar deposits of one or a group of metals or minerals. Because many, perhaps most, provinces have complex, multistage origins, the relative importance of inheritance vs. process is still controversial. In recent years the geographic relationship of many geologically young provinces to present-day plate-tectonic positions (accreting or consuming margins, intraplate structures, etc.) has been widely recognized, and the presumption is strong that older provinces had similar relationships to former plates. As most ore deposits resulted from a favorable conjunction of geological processes that are no longer operative, elucidation of their genesis requires reconstruction of the geologic history of the province, with particular emphasis on events coeval with mineralization. Tectonic analysis is an important aspect of this reconstruction; data from orbiting satellites have contributed greatly to this analysis, as the voluminous literature of the past decade testifies. Both the synoptic view of large areas and the ability to emphasize faint contrasts have revealed linear, curvilinear, and circular features not previously recognized from field studies. Some of these undoubtedly reflect basement structures that have contributed to the development, or limit the extent, of metallogenic provinces. Their recognition and delineation will be increasingly valuable to the assessment of resources available and as guides to exploration for the ores needed by future generations. ?? 1983.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Advances in Space Research","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Elsevier","doi":"10.1016/0273-1177(83)90096-0","issn":"02731177","usgsCitation":"Guild, P.W., 1983, Tectonics and metallogenic provinces: Advances in Space Research, v. 3, no. 2, p. 9-16, https://doi.org/10.1016/0273-1177(83)90096-0.","productDescription":"8 p. ","startPage":"9","endPage":"16","numberOfPages":"8","costCenters":[],"links":[{"id":266029,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/0273-1177(83)90096-0"},{"id":221169,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"3","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505ba486e4b08c986b3203e8","contributors":{"authors":[{"text":"Guild, P. W.","contributorId":39039,"corporation":false,"usgs":true,"family":"Guild","given":"P.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":360922,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70011366,"text":"70011366 - 1983 - Objective procedures for lineament enhancement and extraction","interactions":[],"lastModifiedDate":"2017-01-18T14:43:51","indexId":"70011366","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3052,"text":"Photogrammetric Engineering and Remote Sensing","active":true,"publicationSubtype":{"id":10}},"title":"Objective procedures for lineament enhancement and extraction","docAbstract":"A longterm research goal at EROS Data Center is to develop automated, objective procedures for lineament mapping. In support of this goal, a five-step digital convolution procedure has been used to produce directionally enhanced images, which contain few artifacts and little noise. The main limitation of this procedure is that little enhancement of lineaments occurs in dissected terrain, in shadowed areas, and in flat areas with a uniform land cover. The directional enhancement procedure can be modified to extract edge and line segments from an image. Any of various decision rules can then be used to connect the line segments and to produce a final lineament map. The result is an interpretive map, but one that is based on an objective extraction of lineament components by digital processing. -from Authors","language":"English","usgsCitation":"Moore, G.K., and Waltz, F., 1983, Objective procedures for lineament enhancement and extraction: Photogrammetric Engineering and Remote Sensing, v. 49, no. 5, p. 641-647.","productDescription":"7 p.","startPage":"641","endPage":"647","numberOfPages":"7","costCenters":[{"id":222,"text":"Earth Resources Observation and Science (EROS) Center","active":true,"usgs":true}],"links":[{"id":221230,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"49","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a6a27e4b0c8380cd7401b","contributors":{"authors":[{"text":"Moore, G. K.","contributorId":67550,"corporation":false,"usgs":true,"family":"Moore","given":"G.","email":"","middleInitial":"K.","affiliations":[],"preferred":false,"id":360928,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Waltz, F. A.","contributorId":44034,"corporation":false,"usgs":true,"family":"Waltz","given":"F. A.","affiliations":[],"preferred":false,"id":360927,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70011367,"text":"70011367 - 1983 - Tuffaceous sediments as source rocks for uranium: A case study of the White River Formation, Wyoming","interactions":[],"lastModifiedDate":"2025-03-07T16:58:43.013183","indexId":"70011367","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2302,"text":"Journal of Geochemical Exploration","active":true,"publicationSubtype":{"id":10}},"title":"Tuffaceous sediments as source rocks for uranium: A case study of the White River Formation, Wyoming","docAbstract":"<p><span>Fine-grained tuffaceous sediments of the White River Formation (Oligocene) are evaluated as a possible source of uranium for the sedimentary uranium deposits of Wyoming. The evaluation is based upon a model in which volcanic glass is considered to be a major host of uranium and thorium and in which uranium and silica are released during alteration of glass to montmorillonite. The evaluation scheme is applicable to other tuffaceous sediments in similar geologic settings. The average uranium and thorium contents of glass separates and glassy air-fall ashes of the White River Formation are 8 ppm and 22.4 ppm respectively, and these values approximate the average composition of glass deposited in Wyoming basins in Oligocene time. Comparison of these values with the uranium and thorium concentrations in montmorillonite separates indicates little change in thorium concentrations but reductions in uranium concentrations which average 3.3 ppm. In spite of the apparent major removal of uranium during alteration of glass to montmorillonite, whole-rock samples of tuffaceous siltstones show an average uranium loss of only 0.4 ± 0.4 ppm, because of generally small amounts of clay alteration. This conclusion is generated by comparisons between glassy ash and partially altered vitric siltstones, the latter corrected for dilution of glass and clay-altered glass with uranium- and thorium-poor primary and detrital materials. The original volume of the White River Formation is adequate to generate economically significant quantities of mobile uranium, even with such modest losses. Uranium and silica which are mobilized during glass alteration can coprecipitate as uraniferous secondary silica in areas where solutions become silica saturated. These precipitates indicate pathways of ancient, uranium-rich solutions in tuffaceous rocks. Exploration efforts in the White River Formation and underlying units should concentrate on areas where such pathways intercept reducing environments. Intercepts of this type are present at some uranium deposits in the study area and this lends support to a tuffaceous source rock model.</span></p>","language":"English","publisher":"Elsevier","doi":"10.1016/0375-6742(83)90074-2","issn":"03756742","usgsCitation":"Zielinski, R.A., 1983, Tuffaceous sediments as source rocks for uranium: A case study of the White River Formation, Wyoming: Journal of Geochemical Exploration, v. 18, no. 3, p. 285-306, https://doi.org/10.1016/0375-6742(83)90074-2.","productDescription":"22 p.","startPage":"285","endPage":"306","numberOfPages":"22","costCenters":[],"links":[{"id":221231,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"18","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bb8b5e4b08c986b327a1b","contributors":{"authors":[{"text":"Zielinski, R. A. 0000-0002-4047-5129","orcid":"https://orcid.org/0000-0002-4047-5129","contributorId":106930,"corporation":false,"usgs":true,"family":"Zielinski","given":"R.","email":"","middleInitial":"A.","affiliations":[{"id":164,"text":"Central Energy Resources Science Center","active":true,"usgs":true}],"preferred":false,"id":360929,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70011368,"text":"70011368 - 1983 - Platinum-group elements in rocks from the voikar-syninsky ophiolite complex, Polar Urals, U.S.S.R.","interactions":[],"lastModifiedDate":"2012-03-12T17:18:31","indexId":"70011368","displayToPublicDate":"1983-01-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2746,"text":"Mineralium Deposita","active":true,"publicationSubtype":{"id":10}},"title":"Platinum-group elements in rocks from the voikar-syninsky ophiolite complex, Polar Urals, U.S.S.R.","docAbstract":"Analyses of platinum-group elements (PGE) in rocks collected from the Voikar-Syninsky ophiolite in the Polar Urals suggest that the distribution and geochemistry of PGE in this Paleozoic ophiolite are similar to those in Mesozoic ophiolites from elsewhere. Chondrite-normalized PGE patterns for chromitite, the tectonite unit, and ultramafic and mafic cumulate unit have negative slopes. These results are similar to those found for chromitites from other ophiolites; stratiform chromities show positive slopes. If the magmas that form both types of chromitite originate from similar mantle source material with respect to PGE content, the processes involved must be quite different. However, the distinct chondrite-normalized PGE patterns may reflect differing source materials. ?? 1983 Springer-Verlag.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Mineralium Deposita","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisherLocation":"Springer-Verlag","doi":"10.1007/BF00204489","issn":"00264598","usgsCitation":"Page, N., Aruscavage, P.J., and Haffty, J., 1983, Platinum-group elements in rocks from the voikar-syninsky ophiolite complex, Polar Urals, U.S.S.R.: Mineralium Deposita, v. 18, no. 3, p. 443-455, https://doi.org/10.1007/BF00204489.","startPage":"443","endPage":"455","numberOfPages":"13","costCenters":[],"links":[{"id":221232,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":205100,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/BF00204489"}],"volume":"18","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a7c31e4b0c8380cd7985f","contributors":{"authors":[{"text":"Page, N.J.","contributorId":38125,"corporation":false,"usgs":true,"family":"Page","given":"N.J.","affiliations":[],"preferred":false,"id":360930,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Aruscavage, P. J.","contributorId":41411,"corporation":false,"usgs":true,"family":"Aruscavage","given":"P.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":360931,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Haffty, J.","contributorId":93187,"corporation":false,"usgs":true,"family":"Haffty","given":"J.","affiliations":[],"preferred":false,"id":360932,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
]}