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","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr325","usgsCitation":"Water Resources Division, U.S. Geological Survey, and Saudi Arabia. Deputy Ministry for Mineral Resources, 1983, Landsat image map of the Judayyidat Ar'ar quadrangle, sheet 31E, Kingdom of Saudi Arabia: U.S. Geological Survey Open-File Report 325, 21.26 x 33.07 inches, https://doi.org/10.3133/ofr325.","productDescription":"21.26 x 33.07 inches","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":312758,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"250000","projection":"Transverse Mercator","country":"Saudi Arabia","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n 40.5,\n 32\n ],\n [\n 40.5,\n 31\n ],\n [\n 42,\n 31\n ],\n [\n 42,\n 32\n ],\n [\n 40.5,\n 32\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"567a823ee4b0a04ef490fcf5","contributors":{"authors":[{"text":"Water Resources Division, U.S. Geological Survey","contributorId":128075,"corporation":true,"usgs":false,"organization":"Water Resources Division, U.S. Geological Survey","id":583141,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Saudi Arabia. Deputy Ministry for Mineral Resources","contributorId":147327,"corporation":true,"usgs":false,"organization":"Saudi Arabia. Deputy Ministry for Mineral Resources","id":583142,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70161785,"text":"70161785 - 1983 - Earthquakes: May-June 1983","interactions":[],"lastModifiedDate":"2016-01-06T09:42:47","indexId":"70161785","displayToPublicDate":"2008-12-28T00:00:00","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":"Earthquakes: May-June 1983","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","usgsCitation":"Person, W.J., 1983, Earthquakes: May-June 1983: Earthquake Information Bulletin (USGS), v. 15, no. 6, p. 233-237.","productDescription":"5 p.","startPage":"233","endPage":"237","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":313900,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"15","issue":"6","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"568e48eee4b0e7a44bc418ec","contributors":{"authors":[{"text":"Person, Waverly J.","contributorId":75143,"corporation":false,"usgs":true,"family":"Person","given":"Waverly","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":587761,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70161782,"text":"70161782 - 1983 - A natural earthquake laboratory in Arkansas","interactions":[],"lastModifiedDate":"2016-01-06T09:36:02","indexId":"70161782","displayToPublicDate":"2008-12-28T00:00:00","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":"A natural earthquake laboratory in Arkansas","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","usgsCitation":"Johnston, A.C., 1983, A natural earthquake laboratory in Arkansas: Earthquake Information Bulletin (USGS), v. 15, no. 6, p. 210-215.","productDescription":"6 p.","startPage":"210","endPage":"215","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":313898,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Arkansas","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -94.63623046875,\n 36.491973470593685\n ],\n [\n -90.120849609375,\n 36.5184659896759\n ],\n [\n -90.076904296875,\n 36.43896124085945\n ],\n [\n -90.032958984375,\n 36.38591277287651\n ],\n [\n -90.04394531249999,\n 36.28856319836237\n ],\n [\n -90.15380859375,\n 36.1733569352216\n ],\n [\n -90.340576171875,\n 36.02244668175846\n ],\n [\n -89.67041015625,\n 35.99578538642032\n ],\n [\n -89.6044921875,\n 35.9157474194997\n ],\n [\n -89.75830078125,\n 35.88905007936091\n ],\n [\n -89.8681640625,\n 35.7286770448517\n ],\n [\n -89.901123046875,\n 35.65729624809628\n ],\n [\n -89.84619140625,\n 35.567980458012094\n ],\n [\n -90,\n 35.39800594715108\n ],\n [\n -90.06591796875,\n 35.24561909420681\n ],\n [\n -90.02197265625,\n 35.191766965947394\n ],\n [\n -90.120849609375,\n 35.092945313732635\n ],\n [\n -90.252685546875,\n 35.0120020431607\n ],\n [\n -90.186767578125,\n 34.93097858831627\n ],\n [\n -90.32958984375,\n 34.84987503195418\n ],\n [\n -90.439453125,\n 34.786739162702524\n ],\n [\n -90.428466796875,\n 34.69646117272349\n ],\n [\n -90.538330078125,\n 34.6060845921693\n ],\n [\n -90.52734374999999,\n 34.470335121217495\n ],\n [\n -90.582275390625,\n 34.37064492478658\n ],\n [\n -90.703125,\n 34.361576287484176\n ],\n [\n -90.7470703125,\n 34.252676117101515\n ],\n [\n -90.758056640625,\n 34.134541681937364\n ],\n [\n -90.889892578125,\n 34.03445260967645\n ],\n [\n -90.98876953125,\n 33.897777013859475\n ],\n [\n -90.98876953125,\n 33.75174787568194\n ],\n [\n -90.999755859375,\n 33.63291573870476\n ],\n [\n -91.065673828125,\n 33.55970664841198\n ],\n [\n -91.03271484375,\n 33.458942753687644\n ],\n [\n -91.043701171875,\n 33.32134852669881\n ],\n [\n -91.043701171875,\n 33.27543541298162\n ],\n [\n -91.07666015625,\n 33.109948297894285\n ],\n [\n -91.131591796875,\n 33.02708758002874\n ],\n [\n -94.075927734375,\n 33.02708758002874\n ],\n [\n -93.9990234375,\n 33.5963189611327\n ],\n [\n -94.119873046875,\n 33.58716733904656\n ],\n [\n -94.207763671875,\n 33.53223722395908\n ],\n [\n -94.3505859375,\n 33.55970664841198\n ],\n [\n -94.47143554687499,\n 33.60546961227188\n ],\n [\n -94.537353515625,\n 33.65120829920497\n ],\n [\n -94.46044921875,\n 35.48751102385376\n ],\n [\n -94.63623046875,\n 36.491973470593685\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"15","issue":"6","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"568e48cfe4b0e7a44bc41843","contributors":{"authors":[{"text":"Johnston, Arch C.","contributorId":98708,"corporation":false,"usgs":true,"family":"Johnston","given":"Arch","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":587750,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70011211,"text":"70011211 - 1983 - Heavy-mineral distribution in modern and ancient bay deposits, Willapa Bay, Washington, U.S.A.","interactions":[],"lastModifiedDate":"2025-07-24T15:32:22.113321","indexId":"70011211","displayToPublicDate":"2003-04-22T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3368,"text":"Sedimentary Geology","active":true,"publicationSubtype":{"id":10}},"title":"Heavy-mineral distribution in modern and ancient bay deposits, Willapa Bay, Washington, U.S.A.","docAbstract":"Analysis of heavy-mineral distribution in modern sediments of Willapa Bay, Washington, indicates a dominance of two mineralogic assemblages, one with approximately equivalent amounts of hornblende, orthopyroxene and clinopyroxene, the other dominated by clinopyroxene. The hornblende-orthopyroxene-clinopyroxene suite is derived from the Columbia River, which discharges into the ocean a short distance south of the bay. The clinopyroxene suite is restricted in modern sediments to sands in rivers flowing into the bay from the east. The heavy-mineral distributions suggest that sand discharged from the Columbia River, borne north by longshore transport, and carried into the bay by tidal currents accounts for most of the sand within the interior of Willapa Bay.
Three heavy-mineral assemblages are present in the surrounding Pleistocene deposits; two of these are identical to the modern assemblages described above. These heavy-mineral assemblages reflect the relative influence of tidal and fluvial processes on the Late Pleistocene deposits; their relative influences are consistent with those inferred on the basis of sedimentary structures and stratigraphic relations in about two-thirds of the samples examined. The anomalies can be explained by recycling of sand from older deposits. The persistence of the two heavy-mineral assemblages suggests that the pattern of estuarine sedimentation in Late Pleistocene deposits closely resembled that of the modern bay.
The third heavy-mineral suite, dominated by epidote, occurs in a few older Pleistocene units. On the north side of the bay, the association of this suite with southwest-directed foresets in crossbedded gravel indicates derivation from the northeast, perhaps from an area of glacial outwash. The presence of this suite in ancient estuarine sands exposed on the east side of the bay suggests that input from this northerly source may have intermittently dominated bay deposition in the past.
","language":"English","publisher":"Elsevier","doi":"10.1016/0037-0738(83)90060-X","issn":"00370738","usgsCitation":"Luepke, G., and Clifton, H.E., 1983, Heavy-mineral distribution in modern and ancient bay deposits, Willapa Bay, Washington, U.S.A.: Sedimentary Geology, v. 35, no. 4, p. 233-247, https://doi.org/10.1016/0037-0738(83)90060-X.","productDescription":"15 p.","startPage":"233","endPage":"247","costCenters":[],"links":[{"id":220693,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Washington","otherGeospatial":"Willapa Bay","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -124.0937343147915,\n 46.746899656305146\n ],\n [\n -124.0937343147915,\n 46.648829449792714\n ],\n [\n -123.82927626347455,\n 46.648829449792714\n ],\n [\n -123.82927626347455,\n 46.746899656305146\n ],\n [\n -124.0937343147915,\n 46.746899656305146\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"35","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a3026e4b0c8380cd5d3ea","contributors":{"authors":[{"text":"Luepke, Gretchen","contributorId":91827,"corporation":false,"usgs":true,"family":"Luepke","given":"Gretchen","email":"","affiliations":[],"preferred":false,"id":360568,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Clifton, H. Edward","contributorId":46503,"corporation":false,"usgs":true,"family":"Clifton","given":"H.","email":"","middleInitial":"Edward","affiliations":[],"preferred":false,"id":360569,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70011415,"text":"70011415 - 1983 - Paleoclimatic analyses of middle Eocene through Oligocene planktic foraminiferal faunas","interactions":[],"lastModifiedDate":"2025-06-16T15:34:48.019564","indexId":"70011415","displayToPublicDate":"2003-04-22T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2996,"text":"Palaeogeography, Palaeoclimatology, Palaeoecology","printIssn":"0031-0182","active":true,"publicationSubtype":{"id":10}},"title":"Paleoclimatic analyses of middle Eocene through Oligocene planktic foraminiferal faunas","docAbstract":"Quantitative faunal analyses and oxygen isotope ranking of individual planktic foraminiferal species from deep sea sequences of three oceans are used to make paleoceanographic and paleoclimatic inferences. Species grouped into surface, intermediate and deep water categories based on δ18O values provide evidence of major changes in water-mass stratification, and individual species abundances indicate low frequency cool-warm oscillations. These data suggest that relatively stable climatic phases with minor cool-warm oscillations of ∼0.5 m.y. frequency are separated by rapid cooling events during middle Eocene to early Oligocene time.
Five major climatic phases are evident in the water-mass stratification between middle Eocene through Oligocene time. Phase changes occur at P14/P15, P15/P16, P20/P21 and P21/P22 Zone boundaries and are marked by major faunal turnovers, rapid cooling in the isotope record, hiatuses and changes in the eustatic sea level. A general cooling trend between middle Eocene to early late Oligocene is indicated by the successive replacement of warm middle Eocene surface water species by cooler late Eocene intermediate water species and still cooler Oligocene intermediate and deep water species. Increased water-mass stratification in the latest Eocene (P17), indicated by the coexistence of surface, intermediate and deep dwelling species groups, suggest that increased thermal gradients developed between the equator and poles nearly coincident with the development of the psychrosphere. This pattern may be related to significant ice accumulation between late Eocene and early late Oligocene time.
","language":"English","publisher":"Elsevier","doi":"10.1016/0031-0182(83)90049-4","issn":"00310182","usgsCitation":"Keller, G., 1983, Paleoclimatic analyses of middle Eocene through Oligocene planktic foraminiferal faunas: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 43, no. 1-2, p. 73-94, https://doi.org/10.1016/0031-0182(83)90049-4.","productDescription":"22 p.","startPage":"73","endPage":"94","costCenters":[],"links":[{"id":220902,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"43","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a73c7e4b0c8380cd77234","contributors":{"authors":[{"text":"Keller, G.","contributorId":72527,"corporation":false,"usgs":true,"family":"Keller","given":"G.","affiliations":[],"preferred":false,"id":361031,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70011195,"text":"70011195 - 1983 - Ichnofossils of the alluvial Willwood Formation (lower Eocene), Bighorn Basin, northwest Wyoming, U.S.A","interactions":[],"lastModifiedDate":"2025-06-16T22:38:28.101382","indexId":"70011195","displayToPublicDate":"2003-04-22T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2996,"text":"Palaeogeography, Palaeoclimatology, Palaeoecology","printIssn":"0031-0182","active":true,"publicationSubtype":{"id":10}},"title":"Ichnofossils of the alluvial Willwood Formation (lower Eocene), Bighorn Basin, northwest Wyoming, U.S.A","docAbstract":"The ichnofossil assemblage of the lower Eocene Willwood Formation consists of at least nine distinct endichnia that are preserved in full relief. Four forms (three ichnogenera and four ichnospecies) are new and represent fodinichnia and domichnia of oligochaete worms, an insect or spider, an unknown vertebrate (probably a mammal), and domichnia of an unidentified organism. Other potential trace makers of the ichnofauna include insects, mollusks, and decapods.
In contrast to an Egyptian Oligocene fluvial ichnofauna produced largely by animals that burrowed in stream channel deposits, the Willwood assemblage is principally of flood-plain origin. Though the ichnofauna occurs in a variety of paleosol types, most of the fossils are restricted in distribution to specific sediment and soil types and, within paleosols, to specific identifiable horizons. This attribute will make them valuable indiced of paleoenvironment once they are better known in other ancient alluvial sequences.
The environment suggested by the Willwood trace fossils (damp, but not wet soils with fluctuating water tables) is consistent with the warm temperate to subtropical (possibly monsoonal) conditions that are interpreted for the Willwood Formation by independent evidence of body fossils and paleopedology.
","language":"English","publisher":"Elsevier","doi":"10.1016/0031-0182(83)90050-0","issn":"00310182","usgsCitation":"Bown, T.M., and Kraus, M.J., 1983, Ichnofossils of the alluvial Willwood Formation (lower Eocene), Bighorn Basin, northwest Wyoming, U.S.A: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 43, no. 1-2, p. 95-128, https://doi.org/10.1016/0031-0182(83)90050-0.","productDescription":"34 p.","startPage":"95","endPage":"128","costCenters":[],"links":[{"id":221573,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Wyoming","otherGeospatial":"northwest Wyoming","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -109.80507183883824,\n 44.989270996122485\n ],\n [\n -109.80507183883824,\n 43.36281120582049\n ],\n [\n -107.40183701322437,\n 43.36281120582049\n ],\n [\n -107.40183701322437,\n 44.989270996122485\n ],\n [\n -109.80507183883824,\n 44.989270996122485\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"43","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a37ffe4b0c8380cd61358","contributors":{"authors":[{"text":"Bown, T. M.","contributorId":106858,"corporation":false,"usgs":true,"family":"Bown","given":"T.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":360511,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kraus, M. J.","contributorId":44605,"corporation":false,"usgs":false,"family":"Kraus","given":"M.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":360510,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70011423,"text":"70011423 - 1983 - Surface deformation in volcanic rift zones","interactions":[],"lastModifiedDate":"2025-08-27T16:34:00.671675","indexId":"70011423","displayToPublicDate":"2003-04-08T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3525,"text":"Tectonophysics","active":true,"publicationSubtype":{"id":10}},"title":"Surface deformation in volcanic rift zones","docAbstract":"The principal conduits for magma transport within rift zones of basaltic volcanoes are steeply dipping dikes, some of which feed fissure eruptions. Elastic displacements accompanying a single dike emplacement elevate the flanks of the rift relative to a central depression. Concomitant normal faulting may transform the depression into a graben thus accentuating the topographic features of the rift. If eruption occurs the characteristic ridge-trough-ridge displacement profile changes to a single ridge, centered at the fissure, and the erupted lava alters the local topography. A well-developed rift zone owes its structure and topography to the integrated effects of many magmatic rifting events. To investigate this process we compute the elastic displacements and stresses in a homogeneous, two-dimensional half-space driven by a pressurized crack that may breach the surface. A derivative graphical method permits one to estimate the three geometric parameters of the dike (height, inclination, and depth-to-center) and the mechanical parameter (driving pressure/rock stiffness) from a smoothly varying displacement profile. Direct comparison of measured and theoretical profiles may be used to estimate these parameters even if inelastic deformation, notably normal faulting, creates discontinuities in the profile. Geological structures (open cracks, normal faults, buckles, and thrust faults) form because of stresses induced by dike emplacement and fissure eruption. Theoretical stress states associated with dilation of a pressurized crack are used to interpret the distribution and orientation of these structures and their role in rift formation.
","language":"English","publisher":"Elsevier","doi":"10.1016/0040-1951(83)90034-3","issn":"00401951","usgsCitation":"Pollard, D.D., Delaney, P.T., Duffield, W.A., Endo, E.T., and Okamura, A.T., 1983, Surface deformation in volcanic rift zones: Tectonophysics, v. 94, no. 1-4, p. 541-584, https://doi.org/10.1016/0040-1951(83)90034-3.","productDescription":"44 p.","startPage":"541","endPage":"584","costCenters":[],"links":[{"id":221043,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"94","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b9fa1e4b08c986b31e71f","contributors":{"authors":[{"text":"Pollard, David D.","contributorId":206100,"corporation":false,"usgs":false,"family":"Pollard","given":"David","email":"","middleInitial":"D.","affiliations":[{"id":6986,"text":"Stanford University","active":true,"usgs":false}],"preferred":false,"id":361068,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Delaney, Paul T.","contributorId":15195,"corporation":false,"usgs":true,"family":"Delaney","given":"Paul","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":361065,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Duffield, Wendell A.","contributorId":14363,"corporation":false,"usgs":true,"family":"Duffield","given":"Wendell","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":361067,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Endo, Elliot T.","contributorId":10439,"corporation":false,"usgs":true,"family":"Endo","given":"Elliot","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":361064,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Okamura, Arnold T.","contributorId":53782,"corporation":false,"usgs":true,"family":"Okamura","given":"Arnold","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":361066,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70011626,"text":"70011626 - 1983 - 40Ar 39Ar ages and tectonic setting of ophiolite from the Neyriz area, southeast Zagros Range, Iran","interactions":[],"lastModifiedDate":"2025-08-28T13:23:16.750994","indexId":"70011626","displayToPublicDate":"2003-04-08T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3525,"text":"Tectonophysics","active":true,"publicationSubtype":{"id":10}},"displayTitle":"40Ar 39Ar ages and tectonic setting of ophiolite from the Neyriz area, southeast Zagros Range, Iran","title":"40Ar 39Ar ages and tectonic setting of ophiolite from the Neyriz area, southeast Zagros Range, Iran","docAbstract":"An ophiolite, considered to be an allochthonous fragment of Tethyan oceanic crust and mantle, crops out near Neyriz in the Zagros Range, Iran. 40Ar39 Ar ages ranging from 76.8 ± 23.8 Ma to 105 ± 23.3 Ma were measured on hornblende from five samples of plagiogranite and diabase from the ophiolite. The most precise ages are 85.9 ± 3.8 Ma for a diabase and 83.6 ± 8.4 Ma for a plagiogranite. The weighted mean age of hornblende from the five samples is 87.5 ± 7.2 Ma which indicates that the igneous part of the Neyriz ophiolite formed during the early part of the Late Cretaceous. Pargasite from amphibolite below peridotite of the Neyriz ophiolite has a 40Ar39 Ar age of 94.9 ± 7.6 Ma. The pargasite age agrees within analytical uncertainty with the ages measured on diabase and plagiogranite. Comparable ages have been measured on igneous rocks from the Samail ophiolite of Oman and on amphibolite below peridotite of the Samail ophiolite.
","language":"English","publisher":"Elsevier","doi":"10.1016/0040-1951(83)90220-2","issn":"00401951","usgsCitation":"Lanphere, M.A., and Pamic, J.J., 1983, 40Ar 39Ar ages and tectonic setting of ophiolite from the Neyriz area, southeast Zagros Range, Iran: Tectonophysics, v. 96, no. 3-4, p. 245-256, https://doi.org/10.1016/0040-1951(83)90220-2.","productDescription":"12 p.","startPage":"245","endPage":"256","costCenters":[],"links":[{"id":221123,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Iran","otherGeospatial":"Neyriz area, southeast Zagros Range","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n 46.74904641927378,\n 35.55108755106703\n ],\n [\n 51.21070630443488,\n 28.35162758643818\n ],\n [\n 53.29791348555088,\n 27.067930751170117\n ],\n [\n 55.1289432880766,\n 26.488328383423838\n ],\n [\n 55.99092538880552,\n 27.264884159048705\n ],\n [\n 56.93979153131348,\n 27.07422022248431\n ],\n [\n 57.52768974176284,\n 25.849606574825735\n ],\n [\n 59.21685619682759,\n 27.239550597396246\n ],\n [\n 48.2097869050599,\n 35.57283394155603\n ],\n [\n 46.74904641927378,\n 35.55108755106703\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"96","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e25ee4b0c8380cd45b07","contributors":{"authors":[{"text":"Lanphere, Marvin A. alder@usgs.gov","contributorId":2696,"corporation":false,"usgs":true,"family":"Lanphere","given":"Marvin","email":"alder@usgs.gov","middleInitial":"A.","affiliations":[],"preferred":true,"id":361572,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Pamic, Jakob J.","contributorId":316225,"corporation":false,"usgs":false,"family":"Pamic","given":"Jakob","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":361571,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70011581,"text":"70011581 - 1983 - Accumulation of fossil fuels and metallic minerals in active and ancient rift lakes","interactions":[],"lastModifiedDate":"2025-08-27T16:27:51.597754","indexId":"70011581","displayToPublicDate":"2003-04-08T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3525,"text":"Tectonophysics","active":true,"publicationSubtype":{"id":10}},"title":"Accumulation of fossil fuels and metallic minerals in active and ancient rift lakes","docAbstract":"A study of active and ancient rift systems around the world suggests that accumulations of fossil fuels and metallic minerals are related to the interactions of processes that form rift valleys with those that take place in and around rift lakes. The deposition of the precursors of petroleum, gas, oil shale, coal, phosphate, barite, Cu-Pb-Zn sulfides, and uranium begins with erosion of uplifted areas, and the consequent input of abundant nutrients and solute loads into swamps and tectonic lakes. Hot springs and volcanism add other nutrients and solutes. The resulting high biological productivity creates oxidized/reduced interfaces, and anoxic and H2S-rich bottom waters which preserves metal-bearing organic tissues and horizons. In the depositional phases, the fine-grained lake deposits are in contact with coarse-grained beach, delta, river, talus, and alluvial fan deposits. Earthquake-induced turbidites also are common coarse-grained deposits of rift lakes.
Postdepositional processes in rifts include high heat flow and a resulting concentration of the organic and metallic components that were dispersed throughout the lakebeds. Postdepositional faulting brings organic- and metal-rich sourcebeds in contact with coarse-grained host and reservoir rocks. A suite of potentially economic deposits is therefore a characteristic of rift valleys.
","language":"English","publisher":"Elsevier","doi":"10.1016/0040-1951(83)90038-0","issn":"00401951","usgsCitation":"Robbins, E., 1983, Accumulation of fossil fuels and metallic minerals in active and ancient rift lakes: Tectonophysics, v. 94, no. 1-4, p. 633-658, https://doi.org/10.1016/0040-1951(83)90038-0.","productDescription":"26 p.","startPage":"633","endPage":"658","costCenters":[],"links":[{"id":221452,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"94","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e682e4b0c8380cd4745f","contributors":{"authors":[{"text":"Robbins, Eleanora I.","contributorId":304012,"corporation":false,"usgs":false,"family":"Robbins","given":"Eleanora I.","affiliations":[],"preferred":false,"id":361456,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70011225,"text":"70011225 - 1983 - Strain accumulation along the San Andreas fault system east of San Francisco Bay, California","interactions":[],"lastModifiedDate":"2025-08-27T16:49:29.58543","indexId":"70011225","displayToPublicDate":"2003-04-08T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3525,"text":"Tectonophysics","active":true,"publicationSubtype":{"id":10}},"title":"Strain accumulation along the San Andreas fault system east of San Francisco Bay, California","docAbstract":"The occurrence of several large earthquakes to the east of San Francisco Bay during historical times, and present high levels of microseismicity, indicate that a significant part of the relative plate motion may be occurring east of San Francisco Bay. Furthermore, the Hayward fault is known to be slipping aseismically at the surface, and the Calaveras fault may be slipping aseismically also. These facts raise an important question: Is the observed creep rate accommodating all of the east bay deformation or is there a significant amount of strain accumulating along these faults?
The predominant species of arsenic in ground water are probably arsenite and arsenate. These can be separated with a strong anion-exchange resin (Dowex 1 × 8; 100–200 mesh, acetate form) in a 10 cm × 7 mm column. Samples are filtered and acidified with concentrated hydrochloric acid (1 ml per 100 ml of sample) at the sample site. Five ml of the acidified sample are used for the separation. At this acidity, As(III) passes through the acetate-form resin, and As(V) is retained. As(V) is eluted by passage of 0.12M hydrochloric acid through the column (resulting in conversion of the resin back into the chloride form). Samples are collected in 5-ml portions up to a total of 20 ml. The arsenic concentration in each portion is determined by graphite-furnace atomic-absorption spectrophotometry. The first two fractions give the As(III) concentration and the last two the As(V) concentration. The detection limit for the concentration of each species is 1
A method is presented for the determination of chlorine in geological materials, in which a chloride-selective ion electrode is used after decomposition of the sample with hydrofluoric acid and separation of chlorine in a gas-diffusion cell. Data are presented for 30 geological standard materials. The relative standard deviation of the method is estimated to be better than 8% for amounts of chloride of 10 μg and greater.
","language":"English","publisher":"Elsevier","doi":"10.1016/0039-9140(83)80171-4","issn":"00399140","usgsCitation":"Aruscavage, P.J., and Campbell, E., 1983, An ion-selective electrode method for determination of chlorine in geological materials: Talanta, v. 30, no. 10, p. 745-749, https://doi.org/10.1016/0039-9140(83)80171-4.","productDescription":"5 p.","startPage":"745","endPage":"749","costCenters":[],"links":[{"id":221523,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"30","issue":"10","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059ea92e4b0c8380cd48955","contributors":{"authors":[{"text":"Aruscavage, P. J.","contributorId":41411,"corporation":false,"usgs":true,"family":"Aruscavage","given":"P.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":360978,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Campbell, E.Y.","contributorId":59803,"corporation":false,"usgs":true,"family":"Campbell","given":"E.Y.","email":"","affiliations":[],"preferred":false,"id":360979,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70199685,"text":"70199685 - 1983 - United States Geological Survey Yearbook, fiscal year 1982","interactions":[],"lastModifiedDate":"2025-07-14T14:55:32.737953","indexId":"70199685","displayToPublicDate":"2000-06-13T11:07:24","publicationYear":"1983","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":6,"text":"USGS Unnumbered Series"},"seriesTitle":{"id":392,"text":"Yearbook","active":false,"publicationSubtype":{"id":6}},"title":"United States Geological Survey Yearbook, fiscal year 1982","docAbstract":"The fiscal year 1982 Yearbook summarizes the activities of the U.S. Geological Survey in response to its scientific and regulatory missions.
","language":"English","publisher":"U.S. Government Printing Office","doi":"10.3133/70199685","usgsCitation":"U.S. Geological Survey, 1983, United States Geological Survey Yearbook, fiscal year 1982: Yearbook, iii, 99 p., https://doi.org/10.3133/70199685.","productDescription":"iii, 99 p.","costCenters":[],"links":[{"id":492204,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/unnumbered/70199685/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":357702,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/unnumbered/70199685/report-thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"U.S. Geological Survey","contributorId":152492,"corporation":true,"usgs":false,"organization":"U.S. Geological Survey","id":746191,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":1820,"text":"wsp2220 - 1983 - Basic ground-water hydrology","interactions":[],"lastModifiedDate":"2014-07-14T12:45:06","indexId":"wsp2220","displayToPublicDate":"1995-09-01T00:00:00","publicationYear":"1983","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":341,"text":"Water Supply Paper","code":"WSP","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"2220","title":"Basic ground-water hydrology","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/wsp2220","collaboration":"Prepared in cooperation with the North Carolina Department of Natural Resources and Community Development","usgsCitation":"Heath, R., 1983, Basic ground-water hydrology (First printing 1983; Tenth printing 2004, revised): U.S. Geological Survey Water Supply Paper 2220, v, 86 p., https://doi.org/10.3133/wsp2220.","productDescription":"v, 86 p.","numberOfPages":"91","costCenters":[],"links":[{"id":117466,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wsp/2220/report-thumb.jpg"},{"id":27016,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wsp/2220/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"edition":"First printing 1983; Tenth printing 2004, revised","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a6fe4b07f02db640bd2","contributors":{"authors":[{"text":"Heath, Ralph C.","contributorId":53359,"corporation":false,"usgs":true,"family":"Heath","given":"Ralph C.","affiliations":[],"preferred":false,"id":144207,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ]}