Deep seismic reflection and magnetic data suggest that the Gulf of Maine is underlain by four crustal blocks of differing reflection and magnetic character. Two of these blocks, the Gulf of Maine fault zone and adjacent central plutonic zone, can be correlated with Avalonian rocks in southern New England and New Brunswick. The boundary between them, the Fundy fault, projects onshore near the Ponkapoag fault in southeastern Massachusetts in a region where no major crustal boundary has (yet) been identified. A third block, called the southern plutonic zone, is interpreted as Avalonian, although the reflection and magnetic data are ambiguous. The fourth block, along the rifted continental margin, is correlated with Meguma rocks of Nova Scotia. The late Paleozoic Variscan front crosses the Gulf of Maine within the Gulf of Maine fault zone and indicates significant compressional movement rather than strike-slip.
\n\n
The Moho surface throughout the region is essentially flat and may have been produced by Mesozoic crustal extension. Associated modification of the lower crust was minimal in the northern Gulf and may have been moderate in the central and southern Gulf. The Franklin rift basin formed by reactivation of the inferred Avalon-Meguma boundary beneath Georges Bank as a low-angle detachment.
","language":"English","publisher":"Geological Society of America","doi":"10.1130/0016-7606(1988)100<0172:USGSDS>2.3.CO;2","usgsCitation":"Hutchinson, D.R., Klitgord, K.D., Lee, M.W., and Trehu, A.M., 1988, U.S. Geological Survey deep seismic reflection profile across the Gulf of Maine: Geological Society of America Bulletin, v. 100, no. 2, p. 172-184, https://doi.org/10.1130/0016-7606(1988)100<0172:USGSDS>2.3.CO;2.","productDescription":"13 p.","startPage":"172","endPage":"184","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":186,"text":"Coastal and Marine Geology Program","active":true,"usgs":true}],"links":[{"id":297142,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"Gulf of Maine","volume":"100","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"54dd2c75e4b08de9379b3814","contributors":{"authors":[{"text":"Hutchinson, Deborah R. 0000-0002-2544-5466 dhutchinson@usgs.gov","orcid":"https://orcid.org/0000-0002-2544-5466","contributorId":521,"corporation":false,"usgs":true,"family":"Hutchinson","given":"Deborah","email":"dhutchinson@usgs.gov","middleInitial":"R.","affiliations":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":false,"id":538086,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Klitgord, Kim D.","contributorId":82307,"corporation":false,"usgs":true,"family":"Klitgord","given":"Kim","email":"","middleInitial":"D.","affiliations":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":false,"id":538087,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Lee, Myung W. mlee@usgs.gov","contributorId":779,"corporation":false,"usgs":true,"family":"Lee","given":"Myung","email":"mlee@usgs.gov","middleInitial":"W.","affiliations":[{"id":164,"text":"Central Energy Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":538088,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Trehu, Anne M.","contributorId":49884,"corporation":false,"usgs":false,"family":"Trehu","given":"Anne","email":"","middleInitial":"M.","affiliations":[{"id":6680,"text":"Oregon State University","active":true,"usgs":false}],"preferred":false,"id":538089,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70013819,"text":"70013819 - 1988 - Seismic stratigraphy of the Mississippi-Alabama shelf and upper continental slope","interactions":[],"lastModifiedDate":"2024-10-15T11:46:30.098514","indexId":"70013819","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2667,"text":"Marine Geology","active":true,"publicationSubtype":{"id":10}},"title":"Seismic stratigraphy of the Mississippi-Alabama shelf and upper continental slope","docAbstract":"A dynamic source model is presented, in which a three-dimensional crack containing a viscous compressible fluid is excited into resonance by an impulsive pressure transient applied over a small area ΔS of the crack surface. The crack excitation depends critically on two dimensionless parameters called the crack stiffness, C = (b/μ)(L/d), and viscous damping loss, F = (12ηL)/(ρƒd2α), where b is the bulk modulus, η is the viscosity, ρƒ is the density of the fluid, μ is the rigidity, α is the compressional velocity of the solid, L is the crack length, and d is the crack thickness. The first parameter characterizes the ability of the crack to vibrate and shapes the spectral signature of the source, and the second quantifies the effect of fluid viscosity on the duration of resonance. Resonance is sustained by a very slow wave trapped in the fluid-filled crack. This guided wave, called the crack wave, is similar to the tube wave propagating in a fluid-filled borehole; it is inversely dispersive, showing a phase velocity that decreases with increasing wavelength, and its wave speed is always lower than the acoustic velocity of the fluid, decreasing rapidly as the crack stiffness increases. The source spectrum shows many sharp peaks characterizing the individual modes of vibration of the crack; the variation of spectral shape, both in the number and width of peaks, is surprisingly complex, reflecting the interference between the lateral and longitudinal modes of resonance, as well as nodes for these modes. The far-field spectrum is marked by narrow-band dominant and subdominant peaks that reflect the interaction of the various source modes. The frequency of the dominant spectral peak radiated by the source is independent of the radiation direction. The frequency, bandwidth, and spacing of the resonant peaks are strongly dependent on the crack stiffness, larger values of the stiffness factor shifting these peaks to lower frequencies and decreasing their bandwidth. The excitation of a particular mode depends on the position of the trigger and on the extent of the crack surface affected by the pressure transient. Fluid viscosity decreases the amplitudes of the main spectral peaks, smears out the finer structure of the spectrum, and greatly reduces the duration of the radiated signal. The energy loss by radiation is stronger for high frequencies, producing a seismic signature that is marked by a high-frequency content near the onset of the signal and dominated by a longer-period component of much longer duration in the signal coda. Such signature is in harmony with those displayed by long-period events observed on active volcanoes and in hydrofracture experiments. The very low velocity which is possible in a crack with high stiffness (C ≥ 100) also provides an attractive explanation for very long period tremor, such as type 2 tremor at Aso volcano, Japan, without the requirement of an unrealistically large magma container. The standing wave pattern set up on the crack surface by the sustained resonance in the fluid is observable in the near field of the crack, suggesting that the location and extent of the source may be estimated from the mapping of the pattern of nodes and antinodes seen in its vicinity. According to the model, the long-period event and harmonic tremor share the same source but differ in the boundary conditions for fluid flow and in the triggering mechanism setting up the resonance of the source, the former being viewed as the impulse response of the tremor generating system and the latter representing the excitation due to more complex forcing functions.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/JB093iB05p04375","issn":"01480227","usgsCitation":"Chouet, B., 1988, Resonance of a fluid-driven crack: Radiation properties and implications for the source of long-period events and harmonic tremor: Journal of Geophysical Research Solid Earth, v. 93, no. B5, p. 4375-4400, https://doi.org/10.1029/JB093iB05p04375.","productDescription":"26 p.","startPage":"4375","endPage":"4400","numberOfPages":"26","costCenters":[],"links":[{"id":225598,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"93","issue":"B5","noUsgsAuthors":false,"publicationDate":"2012-09-20","publicationStatus":"PW","scienceBaseUri":"505aa9dee4b0c8380cd86004","contributors":{"authors":[{"text":"Chouet, B.","contributorId":68465,"corporation":false,"usgs":true,"family":"Chouet","given":"B.","affiliations":[],"preferred":false,"id":369274,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70014764,"text":"70014764 - 1988 - Variation of depth to the brittle-ductile transition due to cooling of a midcrustal intrusion","interactions":[],"lastModifiedDate":"2024-02-14T01:08:42.749556","indexId":"70014764","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1807,"text":"Geophysical Research Letters","active":true,"publicationSubtype":{"id":10}},"title":"Variation of depth to the brittle-ductile transition due to cooling of a midcrustal intrusion","docAbstract":"The depth to the brittle-ductile transition in the crust is often defined by the intersection of a shear resistance relation in the brittle upper crust that increases linearly with depth and a power law relation for ductile flow in the lower crust that depends strongly on temperature. Transient variation of this depth caused by a magmatic intrusion at a depth near the regional transition can be modeled by a heat conduction model for a rectangular parallelepiped superimposed on a linear geothermal gradient. When parameters appropriate for the southeastern United States are used, a moderate-sized intrusion is found to decrease the transition depth by as much as 7 km; significant variations last about 10 m.y. Since the base of the seismogenic zone is identified with the brittle-ductile transition and since significant depth variations provide loci for strain energy concentration, these results imply that intrusions of late Tertiary age or younger could be important sources of clustered seismicity.
Vadose cements in the Late Pleistocene Miami Limestone contain regions with two-phase aqueous fluid inclusions that have consistent vapor to liquid (V-L) ratios. When heated, these seemingly primary inclusions homogenize to a liquid phase in a range between 75°C and 130°C (mean = 100°C) and have final melting temperatures between −0.3° and 0.0°C. The original distribution of Th was broadened during measurements because of fluid inclusion reequilibration. The narrow range of Th in these fluid inclusions suggest unusually consistent V-L ratios. They occur with small, obscure, single phase liquid-filled inclusions, which infer a low temperature origin (less than 60°C), and contradict the higher temperature origin implied by the two phase inclusions.
The diagenetic environment producing these seemingly primary fluid inclusions can be inferred from the origin of the host calcite enclosing them. The δ18O composition of these cements (−4 to−5.5%., PDB) and the fresh water in the fluid inclusions are consistent with precipitation from low-temperature meteoric water. The carbon-isotope composition of the vadose cements that contain only rare two-phase fluid inclusions are comparable to the host rock matrix (δ13C between 0 and +4%., PDB). Cements that contain common two-phase fluid-inclusions have a distinctly lighter carbon isotopic composition of −3 to −5%.. The carbon isotope composition of cements that contain common two-phase inclusions are about 6%. lighter than those of other vadose cements; models of early meteoric diagenesis indicate that this is the result of precipitation from water that has been influenced by soil gas CO2.
Our hypothesis is that the primary fluid inclusions, those with consistent V-L ratios and the single-phase liquid inclusions, form at near-surface temperature (25°C) and pressure when consistent proportions of soil gas and meteoric water percolating through the vadose zone are trapped within elongate vacuoles.
This study corroborates that Th measurements on two phase inclusions in vadose cements can be misleading evidence of thermal diagenesis, even if the measurements are well grouped.
","language":"English","publisher":"Elsevier","doi":"10.1016/0016-7037(88)90256-6","issn":"00167037","usgsCitation":"Barker, C., and Halley, R.B., 1988, Fluid inclusions in vadose cement with consistent vapor to liquid ratios, Pleistocene Miami Limestone, southeastern Florida: Geochimica et Cosmochimica Acta, v. 52, no. 5, p. 1019-1025, https://doi.org/10.1016/0016-7037(88)90256-6.","productDescription":"7 p.","startPage":"1019","endPage":"1025","numberOfPages":"7","costCenters":[],"links":[{"id":220668,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"52","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a1277e4b0c8380cd542fc","contributors":{"authors":[{"text":"Barker, C.E.","contributorId":69991,"corporation":false,"usgs":true,"family":"Barker","given":"C.E.","affiliations":[],"preferred":false,"id":366918,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Halley, R. B.","contributorId":87941,"corporation":false,"usgs":true,"family":"Halley","given":"R.","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":366919,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70013796,"text":"70013796 - 1988 - Statistical methods for investigating quiescence and other temporal seismicity patterns","interactions":[],"lastModifiedDate":"2012-03-12T17:18:30","indexId":"70013796","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3209,"text":"Pure and Applied Geophysics PAGEOPH","active":true,"publicationSubtype":{"id":10}},"title":"Statistical methods for investigating quiescence and other temporal seismicity patterns","docAbstract":"We propose a statistical model and a technique for objective recognition of one of the most commonly cited seismicity patterns:microearthquake quiescence. We use a Poisson process model for seismicity and define a process with quiescence as one with a particular type of piece-wise constant intensity function. From this model, we derive a statistic for testing stationarity against a 'quiescence' alternative. The large-sample null distribution of this statistic is approximated from simulated distributions of appropriate functionals applied to Brownian bridge processes. We point out the restrictiveness of the particular model we propose and of the quiescence idea in general. The fact that there are many point processes which have neither constant nor quiescent rate functions underscores the need to test for and describe nonuniformity thoroughly. We advocate the use of the quiescence test in conjunction with various other tests for nonuniformity and with graphical methods such as density estimation. ideally these methods may promote accurate description of temporal seismicity distributions and useful characterizations of interesting patterns. ?? 1988 Birkha??user Verlag.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Pure and Applied Geophysics PAGEOPH","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisherLocation":"Birkha??user-Verlag","doi":"10.1007/BF00879003","issn":"00334553","usgsCitation":"Matthews, M., and Reasenberg, P., 1988, Statistical methods for investigating quiescence and other temporal seismicity patterns: Pure and Applied Geophysics PAGEOPH, v. 126, no. 2-4, p. 357-372, https://doi.org/10.1007/BF00879003.","startPage":"357","endPage":"372","numberOfPages":"16","costCenters":[],"links":[{"id":205035,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/BF00879003"},{"id":220450,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"126","issue":"2-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b9731e4b08c986b31b934","contributors":{"authors":[{"text":"Matthews, M.V.","contributorId":70920,"corporation":false,"usgs":true,"family":"Matthews","given":"M.V.","email":"","affiliations":[],"preferred":false,"id":366887,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Reasenberg, P.A.","contributorId":19959,"corporation":false,"usgs":true,"family":"Reasenberg","given":"P.A.","email":"","affiliations":[],"preferred":false,"id":366886,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70013817,"text":"70013817 - 1988 - Generalized viscoplastic modeling of debris flow","interactions":[],"lastModifiedDate":"2024-12-12T21:53:37.222328","indexId":"70013817","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","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":"Generalized viscoplastic modeling of debris flow","docAbstract":"Various concepts have been proposed or used in the development of Theological models for debris flow. The earliest model developed by Bagnold was based on the concept of the “dispersive” pressure generated by grain collisions. Bagnold's concept appears to be theoretically sound, but his empirical model has been found to be inconsistent with most theoretical models developed from non‐Newtonian fluid mechanics. Although the generality of Bagnold's model is still at issue, debris‐flow modelers in Japan have generally accepted Takahashi's formulas derived from Bagnold's model. Some efforts have recently been made by theoreticians in non‐Newtonian fluid mechanics to modify or improve Bagnold's concept or model. A viable rheological model should consist both of a rate‐independent part and a ratedependent part. A generalized viscoplastic fluid (GVF) model that has both parts as well as two major rheological properties (i.e., the normal stress effect and soil yield criterion) is shown to be sufficiently accurate, yet practical, for general use in debris‐flow modeling. In fact, Bagnold's model is found to be only a particular case of the GVF model. Analytical solutions for (steady) uniform debris flows in wide channels are obtained from the GVF model based on Bagnold's simplified assumption of constant grain concentration.
","language":"English","publisher":"ASCE","doi":"10.1061/(ASCE)0733-9429(1988)114:3(237)","issn":"07339429","usgsCitation":"Chen, C., 1988, Generalized viscoplastic modeling of debris flow: Journal of Hydraulic Engineering, v. 114, no. 3, p. 237-258, https://doi.org/10.1061/(ASCE)0733-9429(1988)114:3(237).","productDescription":"22 p.","startPage":"237","endPage":"258","numberOfPages":"22","costCenters":[],"links":[{"id":219826,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"114","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a144ae4b0c8380cd549a9","contributors":{"authors":[{"text":"Chen, Cheng-lung","contributorId":30752,"corporation":false,"usgs":true,"family":"Chen","given":"Cheng-lung","email":"","affiliations":[],"preferred":false,"id":366931,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70014160,"text":"70014160 - 1988 - Hydrodynamics of Denver basin: Explanation of subnormal fluid pressures","interactions":[],"lastModifiedDate":"2023-01-17T15:50:27.948092","indexId":"70014160","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":701,"text":"American Association of Petroleum Geologists Bulletin","active":true,"publicationSubtype":{"id":10}},"title":"Hydrodynamics of Denver basin: Explanation of subnormal fluid pressures","docAbstract":"Anomalously low fluid potential (and hence subnormal fluid pressure) is found in Mesozoic and Paleozoic rocks of the Denver basin. The potentiometric surface for the Dakota and basal Cretaceous sandstones is 2,000-3,000 ft (600-900 m) beneath the land surface in parts of the Denver basin in Colorado and Nebraska. The potentiometric surface for pre-Pennsylvanian carbonate rocks is 1,500 ft (450 m) lower than the potentiometric surface for the Dakota Sandstone in southeastern Colorado and western Kansas. The low fluid potential seems especially anomalous considering the high elevation of the outcrops along the Laramie and Front Ranges and the Black Hills.
A quasi-three-dimensional numerical flow model is used to investigate the regional flow system in the Denver basin and adjacent Mid-Continent. The model simulates flow through the entire Phanerozoic sedimentary column and indicates that subnormal pressures are a consequence of hydraulic insulation of the strata within the basin from their recharge zones as compared to their discharge zones. The Dakota Sandstone and underlying hydrostratigraphic units are insulated from the overlying water table by low-permeability shales of Cretaceous age, and from their own high-elevation outcrops by a zone of low permeability coincident with the basin deep. Subnormal pressures in the area of Denver, Colorado, and southward are further enhanced by faulting along the Front Range that isolates the stra a within the basin from their outcrops. The results of this study show that (1) subnormal fluid pressures can be explained as a consequence of steady-state regional ground-water flow, (2) shale is an important factor in the regional flow system, and (3) depth is an important control on the distribution of hydraulic conductivity.
","language":"English","publisher":"American Association of Petroleum Geologists","doi":"10.1306/703C999C-1707-11D7-8645000102C1865D","usgsCitation":"Belitz, K., and Bredehoeft, J.D., 1988, Hydrodynamics of Denver basin: Explanation of subnormal fluid pressures: American Association of Petroleum Geologists Bulletin, v. 72, no. 11, p. 1334-1359, https://doi.org/10.1306/703C999C-1707-11D7-8645000102C1865D.","productDescription":"26 p.","startPage":"1334","endPage":"1359","numberOfPages":"26","costCenters":[{"id":376,"text":"Massachusetts Water Science Center","active":true,"usgs":true}],"links":[{"id":226136,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Colorado, Iowa, Kansas, Nebraska, South Dakota, Wyoming","otherGeospatial":"Denver basin","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -104.40130307963295,\n 37.43273547761615\n ],\n [\n -94.90669024004416,\n 37.278349382185866\n ],\n [\n -95.73123888547872,\n 43.12625436891602\n ],\n [\n -105.46272051147162,\n 43.243836203561045\n ],\n [\n -104.40130307963295,\n 37.43273547761615\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"72","issue":"11","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a333fe4b0c8380cd5ee62","contributors":{"authors":[{"text":"Belitz, Kenneth 0000-0003-4481-2345 kbelitz@usgs.gov","orcid":"https://orcid.org/0000-0003-4481-2345","contributorId":442,"corporation":false,"usgs":true,"family":"Belitz","given":"Kenneth","email":"kbelitz@usgs.gov","affiliations":[{"id":27111,"text":"National Water Quality Program","active":true,"usgs":true},{"id":503,"text":"Office of Water Quality","active":true,"usgs":true},{"id":451,"text":"National Water Quality Assessment Program","active":true,"usgs":true},{"id":466,"text":"New England Water Science Center","active":true,"usgs":true},{"id":376,"text":"Massachusetts Water Science Center","active":true,"usgs":true}],"preferred":true,"id":367748,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bredehoeft, John D.","contributorId":86747,"corporation":false,"usgs":true,"family":"Bredehoeft","given":"John","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":367749,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70013777,"text":"70013777 - 1988 - Assimilation of granite by basaltic magma at Burnt Lava flow, Medicine Lake volcano, northern California: Decoupling of heat and mass transfer","interactions":[],"lastModifiedDate":"2012-03-12T17:18:37","indexId":"70013777","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1336,"text":"Contributions to Mineralogy and Petrology","active":true,"publicationSubtype":{"id":10}},"title":"Assimilation of granite by basaltic magma at Burnt Lava flow, Medicine Lake volcano, northern California: Decoupling of heat and mass transfer","docAbstract":"At Medicine Lake volcano, California, andesite of the Holocene Burnt Lava flow has been produced by fractional crystallization of parental high alumina basalt (HAB) accompanied by assimilation of granitic crustal material. Burnt Lava contains inclusions of quenched HAB liquid, a potential parent magma of the andesite, highly melted granitic crustal xenoliths, and xenocryst assemblages which provide a record of the fractional crystallization and crustal assimilation process. Samples of granitic crustal material occur as xenoliths in other Holocene and Pleistocene lavas, and these xenoliths are used to constrain geochemical models of the assimilation process. A large amount of assimilation accompanied fractional crystallization to produce the contaminated Burnt lava andesites. Models which assume that assimilation and fractionation occurred simultaneously estimate the ratio of assimilation to fractional crystallization (R) to be >1 and best fits to all geochemical data are at an R value of 1.35 at F=0.68. Petrologic evidence, however, indicates that the assimilation process did not involve continuous addition of granitic crust as fractionation occurred. Instead, heat and mass transfer were separated in space and time. During the assimilation process, HAB magma underwent large amounts of fractional crystallization which was not accompanied by significant amounts of assimilation. This fractionation process supplied heat to melt granitic crust. The models proposed to explain the contamination process involve fractionation, replenishment by parental HAB, and mixing of evolved and parental magmas with melted granitic crust. ?? 1988 Springer-Verlag.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Contributions to Mineralogy and Petrology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisherLocation":"Springer-Verlag","doi":"10.1007/BF00375365","issn":"00107999","usgsCitation":"Grove, T., Kinzler, R., Baker, M.B., Donnelly-Nolan, J., and Lesher, C., 1988, Assimilation of granite by basaltic magma at Burnt Lava flow, Medicine Lake volcano, northern California: Decoupling of heat and mass transfer: Contributions to Mineralogy and Petrology, v. 99, no. 3, p. 320-343, https://doi.org/10.1007/BF00375365.","startPage":"320","endPage":"343","numberOfPages":"24","costCenters":[],"links":[{"id":205005,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/BF00375365"},{"id":220115,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"99","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059ee8ce4b0c8380cd49dfa","contributors":{"authors":[{"text":"Grove, T.L.","contributorId":22088,"corporation":false,"usgs":true,"family":"Grove","given":"T.L.","email":"","affiliations":[],"preferred":false,"id":366847,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kinzler, R.J.","contributorId":47909,"corporation":false,"usgs":true,"family":"Kinzler","given":"R.J.","email":"","affiliations":[],"preferred":false,"id":366849,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Baker, M. B.","contributorId":76068,"corporation":false,"usgs":true,"family":"Baker","given":"M.","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":366850,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Donnelly-Nolan, J.M.","contributorId":104936,"corporation":false,"usgs":false,"family":"Donnelly-Nolan","given":"J.M.","email":"","affiliations":[],"preferred":false,"id":366851,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Lesher, C.E.","contributorId":28217,"corporation":false,"usgs":true,"family":"Lesher","given":"C.E.","email":"","affiliations":[],"preferred":false,"id":366848,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70013303,"text":"70013303 - 1988 - Semianalytical computation of path lines for finite-difference models","interactions":[],"lastModifiedDate":"2024-03-20T11:21:41.615036","indexId":"70013303","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1861,"text":"Ground Water","active":true,"publicationSubtype":{"id":10}},"title":"Semianalytical computation of path lines for finite-difference models","docAbstract":"A semianalytical particle tracking method was developed for use with velocities generated from block centered finite-difference ground-water flow models. The method is based on the assumption that each directional velocity component varies linearly within a grid cell in its own coordinate directions. This assumption allows an analytical expression to be obtained describing the flow path within an individual grid cell. Given the initial position of a particle anywhere in a cell, the coordinates of any other point along its path line within the cell, and the time of travel between them, can be computed directly. For steady-state systems, the exit point for a particle entering a cell at any arbitrary location can be computed in a single step. By following the particle as it moves from cell to cell, this method can be used to trace the path of a particle through any multidimensional flow field generated from a block-centered finite-difference flow model.
A 60-by-40-km trilateration network in the Yakataga seismic gap was surveyed in 1980, 1982, 1984, and 1986 with precise electro-optical distance-measuring equipment to measure strain accumulation. The overall deformation is roughly approximated by a 0.24±0.03 µstrain/yr N32°W±2.4° uniaxial contraction that is uniform in time. However, the spatial distribution of deformation shows some concentration of convergence in the neighborhood of the Chugach-St. Elias fault and of right-lateral shear across the Contact fault. A simple dislocation model of the plate interaction in the Yakataga gap fits the observed deformation reasonably well but seems to require that the motion of the Pacific plate relative to the North American plate be directed more nearly N36°W than N15°W, the generally accepted direction of relative motion for this location. However, the direction of plate motion inferred from the dislocation model depends upon details of the interaction at the plate boundary that may not have been modeled accurately. A nearby but smaller trilateration network at Icy Bay was surveyed in 1982, 1984, and 1986. This network spans the southwest corner of the rupture zone of the 1979 St. Elias earthquake. The deformation at Icy Bay consists of left-lateral shear across a northeast trending zone. The relation of this deformation to strain accumulation in the Yakataga gap, postseismic relaxation associated with the 1979 earthquake, or rebound from the unloading associated with the rapid recession of the Guyot glacier is not understood.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/JB093iB05p04731","issn":"01480227","usgsCitation":"Savage, J., and Lisowski, M., 1988, Deformation in the Yakataga seismic gap, Southern Alaska, 1980-1986: Journal of Geophysical Research Solid Earth, v. 93, no. B5, p. 4731-4744, https://doi.org/10.1029/JB093iB05p04731.","productDescription":"14 p.","startPage":"4731","endPage":"4744","numberOfPages":"14","costCenters":[],"links":[{"id":225597,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"93","issue":"B5","noUsgsAuthors":false,"publicationDate":"2012-09-20","publicationStatus":"PW","scienceBaseUri":"5059fe46e4b0c8380cd4ec2e","contributors":{"authors":[{"text":"Savage, J.C. 0000-0002-5114-7673","orcid":"https://orcid.org/0000-0002-5114-7673","contributorId":102876,"corporation":false,"usgs":true,"family":"Savage","given":"J.C.","affiliations":[],"preferred":false,"id":369273,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lisowski, M.","contributorId":70381,"corporation":false,"usgs":true,"family":"Lisowski","given":"M.","email":"","affiliations":[],"preferred":false,"id":369272,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014766,"text":"70014766 - 1988 - Absence of strain accumulation in the Shumagin seismic gap, Alaska, 1980-1987","interactions":[],"lastModifiedDate":"2024-05-30T16:36:17.700212","indexId":"70014766","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","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":"Absence of strain accumulation in the Shumagin seismic gap, Alaska, 1980-1987","docAbstract":"Measurements of the deformation of a trilateration network in the Shumagin seismic gap in the interval 1980–1987 failed to detect any significant strain accumulation (observed extension rate in the direction of plate convergence 0.00±0.03 μstrain/yr). Dislocation models of the subduction process and measurements at a comparable network at a known seismic subduction zone (Nankai Trough, Japan) suggest that a rate of the order of −0.2 μstrain/yr should have been observed if the main thrust zone beneath the Shumagin Islands were locked. The simplest explanation of the observed absence of strain accumulation in the Shumagin seismic gap is that the main thrust zone beneath the Shumagin Islands is not presently locked. Other possible explanations depend upon very particular circumstances.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/JB093iB07p07909","issn":"01480227","usgsCitation":"Lisowski, M., Savage, J., Prescott, W., and Gross, W., 1988, Absence of strain accumulation in the Shumagin seismic gap, Alaska, 1980-1987: Journal of Geophysical Research Solid Earth, v. 93, no. B7, p. 7909-7922, https://doi.org/10.1029/JB093iB07p07909.","productDescription":"14 p.","startPage":"7909","endPage":"7922","numberOfPages":"14","costCenters":[],"links":[{"id":225465,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"93","issue":"B7","noUsgsAuthors":false,"publicationDate":"2012-09-20","publicationStatus":"PW","scienceBaseUri":"5059e649e4b0c8380cd47301","contributors":{"authors":[{"text":"Lisowski, M.","contributorId":70381,"corporation":false,"usgs":true,"family":"Lisowski","given":"M.","email":"","affiliations":[],"preferred":false,"id":369237,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Savage, J.C. 0000-0002-5114-7673","orcid":"https://orcid.org/0000-0002-5114-7673","contributorId":102876,"corporation":false,"usgs":true,"family":"Savage","given":"J.C.","affiliations":[],"preferred":false,"id":369239,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Prescott, W.H.","contributorId":96337,"corporation":false,"usgs":true,"family":"Prescott","given":"W.H.","email":"","affiliations":[],"preferred":false,"id":369238,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Gross, W.K.","contributorId":12624,"corporation":false,"usgs":true,"family":"Gross","given":"W.K.","email":"","affiliations":[],"preferred":false,"id":369236,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70013846,"text":"70013846 - 1988 - Nationwide regression models for predicting urban runoff water quality at unmonitored sites","interactions":[],"lastModifiedDate":"2013-02-19T14:30:13","indexId":"70013846","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3718,"text":"Water Resources Bulletin","printIssn":"0043-1370","active":true,"publicationSubtype":{"id":10}},"title":"Nationwide regression models for predicting urban runoff water quality at unmonitored sites","docAbstract":"Regression models are presented that can be used to estimate mean loads for chemical oxygen demand, suspended solids, dissolved solids, total nitrogen, total ammonia plus nitrogen, total phosphorous, dissolved phosphorous, total copper, total lead, and total zinc at unmonitored sites in urban areas. Explanatory variables include drainage area, imperviousness of drainage basin to infiltration, mean annual rainfall, a land-use indicator variable, and mean minimum January temperature. Model parameters are estimated by a generalized-least-squares regression method that accounts for cross correlation and differences in reliability of sample estimates between sites. The regression models account for 20 to 65 percent of the total variation in observed loads.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Water Resources Bulletin","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"American Water Resources Association","doi":"10.1111/j.1752-1688.1988.tb03026.x","issn":"00431370","usgsCitation":"Tasker, G.D., and Driver, N.E., 1988, Nationwide regression models for predicting urban runoff water quality at unmonitored sites: Water Resources Bulletin, v. 24, no. 5, p. 1091-1101, https://doi.org/10.1111/j.1752-1688.1988.tb03026.x.","startPage":"1091","endPage":"1101","numberOfPages":"11","costCenters":[],"links":[{"id":267754,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1111/j.1752-1688.1988.tb03026.x"},{"id":219899,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"24","issue":"5","noUsgsAuthors":false,"publicationDate":"2007-06-08","publicationStatus":"PW","scienceBaseUri":"505a6299e4b0c8380cd71fe7","contributors":{"authors":[{"text":"Tasker, Gary D.","contributorId":83097,"corporation":false,"usgs":true,"family":"Tasker","given":"Gary","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":366998,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Driver, N. E.","contributorId":63398,"corporation":false,"usgs":true,"family":"Driver","given":"N.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":366997,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014461,"text":"70014461 - 1988 - The global distribution, abundance, and stability of SO2 on Io","interactions":[],"lastModifiedDate":"2012-03-12T17:19:30","indexId":"70014461","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1963,"text":"Icarus","active":true,"publicationSubtype":{"id":10}},"title":"The global distribution, abundance, and stability of SO2 on Io","docAbstract":"Sulfur dioxide distribution and abundances, bolometric hemispheric albedos, and passive surface temperatures on Io are modeled and mapped globally from Voyager multispectral mosaics, Earth-based spectra, and photometric descriptions. Photometric models indicate global average values for regolith porosity of 75-95% and macroscopic roughness with a mean slope angle of ~30??. Abundances of SO2 suggested by observations at uv-visible wavelengths and at 4.08 ??m are partially reconciled by intimate-mixing models; 30-50% SO2 coverage of the integral disk is indicated. Three major spectral end members, with continuous mixing, are recognized from the Voyager multispectral mosaics; one of these end members is identified as SO2. Intimate-mixing models with the three spectal end members are used to produce abundance maps for the optical surface; ~30% of Io's total optical surface consists of SO2. The SO2 is concentrated in the bright equatorial band and is relatively deficient in the region of Pele-type volcanic reuptions (long 240??-360??) and the polar regions. Temperatures are computed to vary over a 40??K range, at the same illumination angle, according to variations in surface bolometric hemispheric albedo. The brightest (and locally coldest) areas correspond to areas rich in SO2 and are concentrated in an equatorial band (??30?? lat), but many small cold patches occur elsewhere. These cold patches have radiative equilibrium temperatures ???120??K at the subsolar point, resulting in SO2 saturation vapor pressures ???10-8 bar. Midlatitude areas and the region of Pele-type plume eruptions are generally warmer (due to lower albedos). These results for surface temperatures and SO2 abundances and distribution support the regional coldtrapping model for the surface and atmospheric SO2 presented by F.P. Fanale, W.B. Banerdt, L.S. Elson, T.V. Johnson, and R.W. Zurek (1982, In Satellites of Jupiter (D. Morrison, Ed.), pp. 756-781, Univ. of Arizona Press, Tucson), although the region of Pele-type volcanic eruptions may be better characterized by the regolith condtrapping/volcanic-venting model of D.L. Matson and D.B. Nash (1983, J. Geophys. Res. 88, 4771-4783). The bright equatorial band is especially effective at slowing the formation of polar caps of SO2, both by reducing the sublimation rate near the subsolar point and by coldtrapping the SO2 in the equatorial region, so that competing processes of sputtering and volcanic resurfacing may prevent the formation of polar SO2 caps.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Icarus","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/0019-1035(88)90157-1","issn":"00191035","usgsCitation":"McEwen, A.S., Johnson, T.V., Matson, D.L., and Soderblom, L., 1988, The global distribution, abundance, and stability of SO2 on Io: Icarus, v. 75, no. 3, p. 450-478, https://doi.org/10.1016/0019-1035(88)90157-1.","startPage":"450","endPage":"478","numberOfPages":"29","costCenters":[],"links":[{"id":205665,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/0019-1035(88)90157-1"},{"id":225897,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"75","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bac8ae4b08c986b32357f","contributors":{"authors":[{"text":"McEwen, A. S.","contributorId":11317,"corporation":false,"usgs":true,"family":"McEwen","given":"A.","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":368449,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Johnson, T. V.","contributorId":79619,"corporation":false,"usgs":false,"family":"Johnson","given":"T.","email":"","middleInitial":"V.","affiliations":[],"preferred":false,"id":368451,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Matson, D. L.","contributorId":59940,"corporation":false,"usgs":false,"family":"Matson","given":"D.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":368450,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Soderblom, L.A. 0000-0002-0917-853X","orcid":"https://orcid.org/0000-0002-0917-853X","contributorId":6139,"corporation":false,"usgs":true,"family":"Soderblom","given":"L.A.","affiliations":[],"preferred":false,"id":368448,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70014341,"text":"70014341 - 1988 - Retardations in fault creep rates before local moderate earthquakes along the San Andreas fault system, central California","interactions":[],"lastModifiedDate":"2012-03-12T17:19:29","indexId":"70014341","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3209,"text":"Pure and Applied Geophysics PAGEOPH","active":true,"publicationSubtype":{"id":10}},"title":"Retardations in fault creep rates before local moderate earthquakes along the San Andreas fault system, central California","docAbstract":"Records of shallow aseismic slip (fault creep) obtained along parts of the San Andreas and Calaveras faults in central California demonstrate that significant changes in creep rates often have been associated with local moderate earthquakes. An immediate postearthquake increase followed by gradual, long-term decay back to a previous background rate is generally the most obvious earthquake effect on fault creep. This phenomenon, identified as aseismic afterslip, usually is characterized by above-average creep rates for several months to a few years. In several cases, minor step-like movements, called coseismic slip events, have occurred at or near the times of mainshocks. One extreme case of coseismic slip, recorded at Cienega Winery on the San Andreas fault 17.5 km southeast of San Juan Bautista, consisted of 11 mm of sudden displacement coincident with earthquakes of ML=5.3 and ML=5.2 that occurred 2.5 minutes apart on 9 April 1961. At least one of these shocks originated on the main fault beneath the winery. Creep activity subsequently stopped at the winery for 19 months, then gradually returned to a nearly steady rate slightly below the previous long-term average. The phenomena mentioned above can be explained in terms of simple models consisting of relatively weak material along shallow reaches of the fault responding to changes in load imposed by sudden slip within the underlying seismogenic zone. In addition to coseismic slip and afterslip phenomena, however, pre-earthquake retardations in creep rates also have been observed. Onsets of significant, persistent decreases in creep rates have occurred at several sites 12 months or more before the times of moderate earthquakes. A 44-month retardation before the 1979 ML=5.9 Coyote Lake earthquake on the Calaveras fault was recorded at the Shore Road creepmeter site 10 km northwest of Hollister. Creep retardation on the San Andreas fault near San Juan Bautista has been evident in records from one creepmeter site for the past 5 years. Retardations with durations of 21 and 19 months also occurred at Shore Road before the 1974 and 1984 earthquakes of ML=5.2 and ML=6.2, respectively. Although creep retardation remains poorly understood, several possible explanations have been discussed previously. (1) Certain onsets of apparent creep retardation may be explained as abrupt terminations of afterslip generated from previous moderate-mainshock sequences. (2) Retardations may be related to significant decreases in the rate of seismic and/or aseismic slip occurring within or beneath the underlying seismogenic zone. Such decreases may be caused by changes in local conditions related to growth of asperities, strain hardening, or dilatancy, or perhaps by passage of stress-waves or other fluctuations in driving stresses. (3) Finally, creep rates may be lowered (or increased) by stresses imposed on the fault by seismic or aseismic slip on neighboring faults. In addition to causing creep-rate increases or retardations, such fault interactions occasionally may trigger earthquakes. Regardless of the actual mechanisms involved and the current lack of understanding of creep retardation, it appears that shallow fault creep is sensitive to local and regional effects that promote or accompany intermediate-term preparation stages leading to moderate earthquakes. A strategy for more complete monitoring of fault creep, wherever it is known to occur, therefore should be assigned a higher priority in our continuing efforts to test various hypotheses concerning the mechanical relations between seismic and aseismic slip. ?? 1988 Birkha??user Verlag.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Pure and Applied Geophysics PAGEOPH","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisherLocation":"Birkha??user-Verlag","doi":"10.1007/BF00879008","issn":"00334553","usgsCitation":"Burford, R.O., 1988, Retardations in fault creep rates before local moderate earthquakes along the San Andreas fault system, central California: Pure and Applied Geophysics PAGEOPH, v. 126, no. 2-4, p. 499-529, https://doi.org/10.1007/BF00879008.","startPage":"499","endPage":"529","numberOfPages":"31","costCenters":[],"links":[{"id":205660,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/BF00879008"},{"id":225829,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"126","issue":"2-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505aac03e4b0c8380cd86ae5","contributors":{"authors":[{"text":"Burford, Robert O.","contributorId":52560,"corporation":false,"usgs":true,"family":"Burford","given":"Robert","middleInitial":"O.","affiliations":[],"preferred":false,"id":368160,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70014336,"text":"70014336 - 1988 - Power formula for open-channel flow resistance","interactions":[],"lastModifiedDate":"2012-03-12T17:19:30","indexId":"70014336","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Power formula for open-channel flow resistance","docAbstract":"This paper evaluates various power formulas for flow resistance in open channels. Unlike the logarithmic resistance equation that can be theoretically derived either from Prandtl's mixing-length hypothesis or von Karman's similarity hypothesis, the power formula has long had an appearance of empiricism. Nevertheless, the simplicity in the form of the power formula has made it popular among the many possible forms of flow resistance formulas. This paper reexamines the concept and rationale of the power formulation, thereby addressing some critical issues in the modeling of flow resistance.","conferenceTitle":"Hydraulic Engineering: Proceedings of the 1988 National Conference on Hydraulic Engineering","conferenceDate":"8 August 1988 through 12 August 1988","conferenceLocation":"Colorado Springs, CO, USA","language":"English","publisher":"Publ by ASCE","publisherLocation":"New York, NY, United States","isbn":"0872626709; 0872626709","usgsCitation":"Chen, C., 1988, Power formula for open-channel flow resistance, Hydraulic Engineering: Proceedings of the 1988 National Conference on Hydraulic Engineering, Colorado Springs, CO, USA, 8 August 1988 through 12 August 1988, p. 25-35.","startPage":"25","endPage":"35","numberOfPages":"11","costCenters":[],"links":[{"id":225701,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a80a0e4b0c8380cd7b0ed","contributors":{"authors":[{"text":"Chen, Cheng-lung","contributorId":30752,"corporation":false,"usgs":true,"family":"Chen","given":"Cheng-lung","email":"","affiliations":[],"preferred":false,"id":368152,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70014447,"text":"70014447 - 1988 - Stable isotope geochemistry of sphalerite and other mineral matter in coal beds of the Illinois and Forest City basins","interactions":[],"lastModifiedDate":"2024-01-05T15:39:57.267954","indexId":"70014447","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1472,"text":"Economic Geology","active":true,"publicationSubtype":{"id":10}},"title":"Stable isotope geochemistry of sphalerite and other mineral matter in coal beds of the Illinois and Forest City basins","docAbstract":"Cleat and clastic dikes of Middle Pennsylvanian-age coal beds of the Illinois and Forest City basins of Illinois, Iowa, Missouri, and Kansas locally contain appreciable amounts of sphalerite within a kaolinite-pyrite-sphalerite (+ or - pyrite)-calcite paragenetic sequence. The sphalerite and associated minerals are of interest as a partial record of the history of fluids in the sedimentary basin and as possible indicators of Mississippi Valley-type mineralization. Moreover, zinc from the sphalerite may represent an exploitable by-product of coal mining and combustion.Pyrite is abundant in these coals both as fine-grained disseminated framboids that formed during early diagenesis and as coarser grained cleat fillings, etc., that formed much later. The delta 34 S values of this later pyrite, the sphalerite, and the coal organic matter range from -12 to 19 per mil. Within individual samples, however, pyrite, sphalerite, and organic matter sulfur delta 34 S values are nearly identical. This similarity strongly suggests related origins. The delta 34 S values of pyrite, sphalerite, and organic matter from coals of the Illinois basin and the central and southern Forest City basin range from -12 to 0 per mil. This range is not unique to the sphalerite-bearing coals; pyrite and organic matter from sphalerite-free high sulfur coals have similar delta 34 S values (Price and Shieh, 1979). We believe that sulfur produced by the breakdown of organosulfur compounds in the coal is incorporated into the epigenetic sulfides. In the northern Forest City basin, however, many samples have delta 34 S values between 8 and 19 per mil. These are similar to the delta 34 S values of sphalerite and pyrite from the Upper Mississippi Valley Zn-Pb district which lies northeast of the Forest City basin and north of the Illinois basin. This similarity suggests input from a Mississippi Valley-type hydrothermal system.Cleat kaolinite has delta D values of -36 to -24 per mil and delta 18 O values of 19.2 to 20.2 per mil. Assuming that clearing postdated the lignite rank of coalification implies that kaolinite was deposited between 40 degrees and 100 degrees C. At the lower temperatures, the kaolinite fluid would have had an isotopic composition similar to seawater; at the higher temperatures, it would have had a composition similar to the sphalerite-depositing fluid. Sphalerite was deposited from a fluid that was chemically and isotopically similar to the fluids responsible for the main-stage ores of the Upper Mississippi Valley Zn-Pb district (75 degrees -113 degrees C, approximately 21 equiv wt % NaCl, delta D = -65 to -3ppm, and delta 18 O = -0.9-9.9ppm). The isotopic compositions (delta 13 C = -12.4 to -2.7ppm and delta 18 O = 21.1-25.8ppm) and paragenetic positions of the cleat calcite samples are similar to those of the late-stage calcite of the Upper Mississippi Valley Zn-Pb and Illinois-Kentucky fluorspar districts. Calcite inclusion fluids had delta D (sub H 2 O) values of -80 and -58 per mil, implying a meteoric water source. At probable temperatures of 15 degrees to 75 degrees C, this calcite formed from fluids having calculated delta 18 O (sub H 2 O) values of -9 to 1 per mil, implying slight to moderate exchange with sedimentary rocks. The diagenetic-epigenetic history of fluids recorded by the cleat minerals probably began with a slightly evolved seawater, followed by a metal-bearing deep basin brine, and concluded with a cooler, slightly evolved, meteoric-water fluid.
","language":"English","publisher":"Society of Economic Geologists","doi":"10.2113/gsecongeo.83.5.990","issn":"03610128","usgsCitation":"Whelan, J.F., Cobb, J., and Rye, R.O., 1988, Stable isotope geochemistry of sphalerite and other mineral matter in coal beds of the Illinois and Forest City basins: Economic Geology, v. 83, no. 5, p. 990-1007, https://doi.org/10.2113/gsecongeo.83.5.990.","productDescription":"18 p.","startPage":"990","endPage":"1007","numberOfPages":"18","costCenters":[],"links":[{"id":225640,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"83","issue":"5","noUsgsAuthors":false,"publicationDate":"1988-08-01","publicationStatus":"PW","scienceBaseUri":"505b9679e4b08c986b31b51e","contributors":{"authors":[{"text":"Whelan, J. F.","contributorId":45328,"corporation":false,"usgs":true,"family":"Whelan","given":"J.","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":368414,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Cobb, J.C.","contributorId":103419,"corporation":false,"usgs":true,"family":"Cobb","given":"J.C.","email":"","affiliations":[],"preferred":false,"id":368416,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Rye, R. O.","contributorId":66208,"corporation":false,"usgs":true,"family":"Rye","given":"R.","email":"","middleInitial":"O.","affiliations":[],"preferred":false,"id":368415,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70014300,"text":"70014300 - 1988 - Ostwald ripening and interparticle-diffraction effects for illite crystals","interactions":[],"lastModifiedDate":"2012-03-12T17:19:36","indexId":"70014300","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":738,"text":"American Mineralogist","active":true,"publicationSubtype":{"id":10}},"title":"Ostwald ripening and interparticle-diffraction effects for illite crystals","docAbstract":"The Warren-Averbach method, an X-ray diffraction (XRD) method used to measure mean particle thickness and particle-thickness distribution, is used to restudy sericite from the Silverton caldera. Apparent particle-thickness distributions indicate that the clays may have undergone Ostwald ripening and that this process has modified the K-Ar ages of the samples. The mechanism of Ostwald ripening can account for many of the features found for the hydrothermal alteration of illite. Expandabilities measured by the XRD peak-position method for illite/smectites (I/S) from various locations are smaller than expandabilities measured by transmission electron microscopy (TEM) and by the Warren-Averbach (W-A) method. This disparity is interpreted as being related to the presence of nonswelling basal surfaces that form the ends of stacks of illite particles (short-stack effect), stacks that, according to the theory of interparticle diffraction, diffract as coherent X-ray scattering domains. -from Authors","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"American Mineralogist","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","issn":"0003004X","usgsCitation":"Eberl, D.D., and Srodon, J., 1988, Ostwald ripening and interparticle-diffraction effects for illite crystals: American Mineralogist, v. 73, no. 11-12, p. 1335-1345.","startPage":"1335","endPage":"1345","numberOfPages":"11","costCenters":[],"links":[{"id":226144,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"73","issue":"11-12","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a7162e4b0c8380cd765bc","contributors":{"authors":[{"text":"Eberl, D. D.","contributorId":66282,"corporation":false,"usgs":true,"family":"Eberl","given":"D.","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":368068,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Srodon, J.","contributorId":67583,"corporation":false,"usgs":false,"family":"Srodon","given":"J.","affiliations":[],"preferred":false,"id":368069,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":2002348,"text":"2002348 - 1988 - Identification, movement, growth, mortality, and exploitation of walleye stocks in Lake St. Clair and the western basin of Lake Erie","interactions":[],"lastModifiedDate":"2012-02-02T00:15:03","indexId":"2002348","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":1,"text":"Federal Government Series"},"seriesTitle":{"id":27,"text":"Fisheries Research Report","active":false,"publicationSubtype":{"id":1}},"seriesNumber":"1954","title":"Identification, movement, growth, mortality, and exploitation of walleye stocks in Lake St. Clair and the western basin of Lake Erie","docAbstract":"The harvest of walleye by sport and commercial fisheries in lakes St. Clair and Erie is under a cooperative management program involving several states and two countries. In this report we present the results of a long-term tag-recapture study as well as corroborative evidence of stock discreteness fromstudies of population characteristics such as growth and allelic frequencies of walleye in these waters. Walleye were tagged in the spring from 1975-87 in lakes St. Clair and Erie. Tag-recapture data indicate a general tendency for walleye to move northward after tagging. Walleye tagged in Lake St. Clair had higher recovery rates and lower survival rates than walleye tagged in Lake Erie. A reward-tag study in Lake St. Clair provided an estimate of a non-reporting rate of approximately 33% which is comparable to rates in the literature for other species. Data from the Ontario commercial (gill-net) fishery, Michigan Department of Natural Resources trap-net surveys, and sport fisheries from western Lake Erie and Lake St. Clair were analyzed with a catch-at-age model which permitted estimation of population abundance (12.2 to 34.5 million fish), fishing mortality rate (0.19 to 0.37), and annual survival rate (0.57 to 0.68). It appears that exploitation rates for the sport fishery in the western basin exceeded those of the commercial fishery from 1978-82. In recent years (1983-87), exploitation rates were comparable. Average abundance and catch of walleye in the western basin were 12.2 million and 3.4 million fish in 1978-82; average abundance and catch in 1983-87 were 34.5 and 5.2 million fish. We found good agreement between the estimate of the harvest from creel surveys and that from the catch-at-age model for Lake Erie. Walleye abundance and harvest in Lake St. Clair were 10% of the values for the western basin of Lake Erie. Two discrete stocks were delineated be analysis of allelic frequencies of samples from Lake St. Clair and Lake Erie spawning populations. These two stocks are the western basin of Lake Erie and Lake St. Clair stocks. No further subdivision of stocks was possible based on the genetic analysis of 21 loci. These genetically different stocks intermix in the northern waters of this system. Based on a consideration of the results of the genetic analysis, catch-at-age analysis, and tag-recapture study we recommend independent but coordinated management of the walleye populations in Lake St. Clair and Lake Erie.","language":"English","publisher":"U.S. Fish and Wildlife Service","usgsCitation":"Haas, R.C., Fabrizio, M.C., and Todd, T.N., 1988, Identification, movement, growth, mortality, and exploitation of walleye stocks in Lake St. Clair and the western basin of Lake Erie: Fisheries Research Report 1954, 71 p.","productDescription":"71 p.","startPage":"0","endPage":"71","numberOfPages":"71","costCenters":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"links":[{"id":198276,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a09e4b07f02db5faa06","contributors":{"authors":[{"text":"Haas, Robert C.","contributorId":97450,"corporation":false,"usgs":true,"family":"Haas","given":"Robert","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":326472,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Fabrizio, Mary C.","contributorId":77471,"corporation":false,"usgs":true,"family":"Fabrizio","given":"Mary","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":326471,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Todd, Thomas N.","contributorId":42547,"corporation":false,"usgs":true,"family":"Todd","given":"Thomas","email":"","middleInitial":"N.","affiliations":[],"preferred":false,"id":326470,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70014389,"text":"70014389 - 1988 - Cyclic development of igneous features and their relationship to high-temperature hydrothermal features in the Henderson porphyry molybdenum deposit, Colorado","interactions":[],"lastModifiedDate":"2024-01-05T16:34:12.501679","indexId":"70014389","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1472,"text":"Economic Geology","active":true,"publicationSubtype":{"id":10}},"title":"Cyclic development of igneous features and their relationship to high-temperature hydrothermal features in the Henderson porphyry molybdenum deposit, Colorado","docAbstract":"The Henderson porphyry molybdenum deposit was formed by the superposition of coupled alteration and mineralization events, of varying intensity and size, that were associated with each of at least 11 intrusions. Deposition of molybdenite was accompanied by time-equivalent silicic and potassic alteration. High-temperature alteration and mineralization are spatially and temporally linked to the crystallization of compositionally zoned magma in the apex of stocks. Differences in hydrothermal features associated with each intrusion (e.g., mass of ore, orientation and type of veins, density of veins, and intensity of alteration) correlate with differences in primary igneous features (e.g., composition, texture, morphology, and size). The systematic relations between hydrothermal and magmatic features suggest that primary magma compositions, including volatile contents, largely control the geometry, volume, level of emplacement, and mechanisms of crystallization of stocks. These elements in turn govern the orientations and densities of fractures, which ultimately determine the distribution patterns of hydrothermal alteration and mineralization.Based on primary igneous features, intrusions are grouped into four types, 1 to 4. The first three types define a potassic series of compositions (normarive orthoclase/albite greater than 1) and form a continuum from texturally and compositionally simple intrusions (type 1) to complex intrusions (type 3). Intensity and volume of high-temperature alteration and mineralization associated with a given stock increase from type 1 (2% of total ore) to type 3 (77% of total ore). Complex and strongly mineralizing intrusions (type 3) are separated from one another in time by relatively simple and weakly mineralizing intrusions (type 1). Stocks of type 4, the youngest intrusions, define a sodic series of compositions (normative orthoclase/albite less than 1) and are associated with the waning stages of mineralization.A number of textural features indicate that highly mineralizing type 3 stocks contained high primary concentrations of volatile components, e.g., the presence of unidirectional solidification textures, aplitic rather than aphanitic groundmass, extreme local textural variability, low percentages of phenocrysts in apices, brecciation of apices, and low volumes of dikes. From apex to root zone, textural units within the Seriate stock (type 3), the most productive stock in the deposit, include: (1) a Brain Rock unit with abundant quartz + or - fluorite crenulate layers, (2) a Border unit of generally low but variable phenocryst content (0-25%), (3) a transition zone, 5 to 10 m wide, of unidirectional solidification textures, (4) an Intermediate unit of moderate phenocryst content (25%), (5) another transition zone, 5 to 10 m wide, of unidirectional solidification textures, (6) a Porphyry unit of high phenocryst contents (40%), and (7) a Granite Porphyry or Granite unit. Crystals in layers of unidirectional textures always project toward the interior of the stock and indicate progressive inward solidification of magma along the walls of a chamber. Variations in texture are accompanied by variations in primary composition: the apex of the Seriate stock (the region above the deepest transition zone of unidirectional textures) is enriched in K 2 O and SiO 2 and depleted in Na 2 O, F, Nb, and Y relative to deeper units.Mineralization in the deposit is controlled by moderately outward-dipping concentric veins of both replacement and open-space origin, and by steeply dipping radial veins of replacement origin. Both sets of veins were formed nearly simultaneously about a stock and are focused in a systematic manner on the apex. A classic stockwork of veins occurs only in regions where vein sets associated with spatially separated intrusions overlap. Fluids that filled outward-dipping concentric structures flowed downward and outward from a stock. Fluid pressures in excess of lithostatic pressures, generated during crystallization of magma, were required to open and fill concentric structures. As magma solidified progressively inward, the zone of fluid evolution also migrated downward and inward. With time, the volume of evolved fluids decreased: vein densities decrease from greater than 200/m in the Seriate Brain Rock unit to less than 0.1/m immediately below the last transition zone separating the Seriate Intermediate unit from Seriate Porphyry unit. Crosscutting relations between veins and high-level dikes associated with the Seriate stock establish that most of the ore related to the Seriate stock was deposited prior to solidification of its deepest transition zone of unidirectional solidification textures.The absence of high-temperature veins and associated hydrothermal alteration in deep cores of stocks, the distribution of ore about the high levels of stocks, the orientation of veins about the apex of stocks, and the crosscutting relations between veins and dikes of the same stock are suggestive of initially high concentrations of molybdenum and volatiles in the apex of a stock immediately prior to the onset of significant crystallization. Additional accumulation of ore components, if any, ceased after solidification of the apex. Assignment of molybdenum in the ore shell about the Seriate stock to the volume of solid occupied by the apex of the Seriate stock yields concentration levels in the apical magma of approximately 13,000 ppm Mo.
","language":"English","publisher":"Society of Economic Geologists","doi":"10.2113/gsecongeo.83.2.266","issn":"03610128","usgsCitation":"Carten, R., Geraghty, E.P., and Walker, B., 1988, Cyclic development of igneous features and their relationship to high-temperature hydrothermal features in the Henderson porphyry molybdenum deposit, Colorado: Economic Geology, v. 83, no. 2, p. 266-296, https://doi.org/10.2113/gsecongeo.83.2.266.","productDescription":"31 p.","startPage":"266","endPage":"296","numberOfPages":"31","costCenters":[],"links":[{"id":225702,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"83","issue":"2","noUsgsAuthors":false,"publicationDate":"1988-04-01","publicationStatus":"PW","scienceBaseUri":"5059fd23e4b0c8380cd4e65e","contributors":{"authors":[{"text":"Carten, R.B.","contributorId":45770,"corporation":false,"usgs":true,"family":"Carten","given":"R.B.","email":"","affiliations":[],"preferred":false,"id":368285,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Geraghty, E. P.","contributorId":83283,"corporation":false,"usgs":false,"family":"Geraghty","given":"E.","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":368286,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Walker, B.M.","contributorId":26820,"corporation":false,"usgs":true,"family":"Walker","given":"B.M.","email":"","affiliations":[],"preferred":false,"id":368284,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70014361,"text":"70014361 - 1988 - A climatic-limnologic model of diatom succession for paleolimnological interpretation of varved sediments at Elk Lake, Minnesota","interactions":[],"lastModifiedDate":"2012-03-12T17:19:28","indexId":"70014361","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2411,"text":"Journal of Paleolimnology","active":true,"publicationSubtype":{"id":10}},"title":"A climatic-limnologic model of diatom succession for paleolimnological interpretation of varved sediments at Elk Lake, Minnesota","docAbstract":"Sediment traps placed in the profundal region of Elk Lake, north central Minnesota during the 1979 spring and 1983-84 fall and spring seasons monitored seasonal diatom production for two climatically distinctive periods. The spring of 1979 was one of the coldest and wettest on record. Ice out at Elk Lake was 10 days later than average, and spring circulation was short. Fragilaria crotonensis dominated the late spring and early summer diatom production in association with Synedra and Cyclotella species, perhaps because rates of phosphorus supply were low compared to silica. The winter of 1983-84 was drier than usual, and the early but cold spring of 1984 caused ice out at Elk Lake to be about 1 week earlier than normal. Spring storms promoted a long and full circulation that allowed Stephanodiscus minulutus to bloom, presumably in response to increased phosphorus loading related to deep and vigorous circulation. The two dominant diatoms in Elk Lake, F. crotonensis and S. minutulus may reflect climatic patterns that control lake circulation. The climatically regulated occurrence of these diatoms is generally, but not specifically, comparable to their distribution in lake surface sediments throughout Minnesota. A combination of regional and lake-specific studies on the controls of diatom succession and distribution provides climatic insights for interpreting paleolimnogical records of diatoms. ?? 1988 Kluwer Academic Publishers.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Paleolimnology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisherLocation":"Kluwer Academic Publishers","doi":"10.1007/BF00196068","issn":"09212728","usgsCitation":"Platt, B.J., 1988, A climatic-limnologic model of diatom succession for paleolimnological interpretation of varved sediments at Elk Lake, Minnesota: Journal of Paleolimnology, v. 1, no. 2, p. 115-131, https://doi.org/10.1007/BF00196068.","startPage":"115","endPage":"131","numberOfPages":"17","costCenters":[],"links":[{"id":205689,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/BF00196068"},{"id":226217,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"1","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e345e4b0c8380cd45f14","contributors":{"authors":[{"text":"Platt, Bradbury J.","contributorId":67651,"corporation":false,"usgs":true,"family":"Platt","given":"Bradbury","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":368217,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70014305,"text":"70014305 - 1988 - Liquid hydrocarbons probable under Ross Sea","interactions":[],"lastModifiedDate":"2018-02-19T17:28:47","indexId":"70014305","displayToPublicDate":"1988-01-01T00:00:00","publicationYear":"1988","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2941,"text":"Oil & Gas Journal","printIssn":"0030-1388","active":true,"publicationSubtype":{"id":10}},"title":"Liquid hydrocarbons probable under Ross Sea","docAbstract":"Thick glacial strata, which have no source-rock potential, cover the Ross Sea. If these strata persist to great depths, then hydrocarbon-generation prospects will be poor. Deeply buried strata within Ross Sea rift-grabens, if like other Gondwana rift-deposits, could have good potential for hydrocarbon generation. Current hydrocarbon assessments of the Ross Sea and adjacent areas must be considered highly speculative because the deeply buried rift(?) strata have not been sampled in situ. The assessment of the Ross Sea relies on geophysical/geologic data, two-stage rift models, and data from formerly nearby Gondwana rift-basins. We conclude that conditions favorable for hydrocarbon generation and entrapment are likely throughout the Ross Sea, and especially in the Victoria Land basin, if adequate source beds exist. -Authors","language":"English","publisher":"PennWell Corporation","publisherLocation":"Tulsa, OK","usgsCitation":"Cooper, A.K., Davey, F., and Hinz, K., 1988, Liquid hydrocarbons probable under Ross Sea: Oil & Gas Journal, v. 86, no. 46, p. 118-124.","productDescription":"7 p.","startPage":"118","endPage":"124","costCenters":[],"links":[{"id":226214,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"86","issue":"46","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a47fde4b0c8380cd67b39","contributors":{"authors":[{"text":"Cooper, A. K.","contributorId":50149,"corporation":false,"usgs":true,"family":"Cooper","given":"A.","email":"","middleInitial":"K.","affiliations":[],"preferred":false,"id":368077,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Davey, F.J.","contributorId":99152,"corporation":false,"usgs":true,"family":"Davey","given":"F.J.","email":"","affiliations":[],"preferred":false,"id":368079,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hinz, K.","contributorId":83273,"corporation":false,"usgs":true,"family":"Hinz","given":"K.","email":"","affiliations":[],"preferred":false,"id":368078,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ]}