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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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North America
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Gulf Coastal Plain (6)
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United States
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Alabama (1)
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Black Warrior Basin (1)
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Colorado (1)
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Colorado Plateau (3)
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Illinois (1)
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Kentucky (1)
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Missouri
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Viburnum Trend (1)
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Oklahoma
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Ozark Mountains (1)
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elements, isotopes
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stable isotopes
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C-13/C-12 (5)
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O-18/O-16 (5)
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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S-34/S-32 (9)
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lead
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vanadium (1)
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oxygen
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O-18/O-16 (5)
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sulfur
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S-34/S-32 (9)
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geochronology methods
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U/Pb (1)
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Mesozoic
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Paleozoic
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minerals
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sulfates
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sulfides
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Primary terms
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brines (2)
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carbon
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C-13/C-12 (5)
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organic carbon (2)
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Cenozoic
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Tertiary
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Neogene
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Miocene
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Oakville Sandstone (2)
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Paleogene
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Eocene
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Green River Formation (1)
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upper Eocene
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isotopes
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radioactive isotopes
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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stable isotopes
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C-13/C-12 (5)
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O-18/O-16 (5)
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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S-34/S-32 (9)
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Sr-87/Sr-86 (1)
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magmas (1)
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Mesozoic
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Jurassic
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Upper Jurassic
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Brushy Basin Member (2)
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Morrison Formation (3)
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Salt Wash Sandstone Member (1)
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metal ores
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lead ores (1)
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uranium ores (8)
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vanadium ores (3)
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metals
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (1)
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lead
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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vanadium (1)
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mineral deposits, genesis (10)
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minerals (3)
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North America
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Gulf Coastal Plain (6)
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oil and gas fields (2)
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oxygen
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O-18/O-16 (5)
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Paleozoic
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Cambrian
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Upper Cambrian
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Bonneterre Formation (1)
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Lamotte Sandstone (1)
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Carboniferous
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Pennsylvanian
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Hermosa Group (1)
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Mary Lee Coal (1)
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Middle Pennsylvanian (1)
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Pottsville Group (1)
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paragenesis (1)
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petroleum
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natural gas
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coalbed methane (1)
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sedimentary petrology (1)
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sedimentary rocks
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chemically precipitated rocks
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clastic rocks
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sandstone (4)
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coal
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lignite (1)
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sedimentation (1)
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soils (1)
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sulfur
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S-34/S-32 (9)
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United States
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Alabama (1)
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Black Warrior Basin (1)
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Colorado (1)
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Colorado Plateau (3)
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Illinois (1)
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Kentucky (1)
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Midcontinent (1)
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Mississippi Valley
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Upper Mississippi Valley (1)
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Missouri
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Saint Francois Mountains (1)
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Viburnum Trend (1)
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Oklahoma
-
Caddo County Oklahoma (1)
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Ozark Mountains (1)
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Texas
-
Karnes County Texas (3)
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Live Oak County Texas (4)
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Webb County Texas (1)
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Uinta Basin (1)
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Utah
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Duchesne County Utah (1)
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Uintah County Utah (1)
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Wyoming
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Carbon County Wyoming (1)
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weathering (1)
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sedimentary rocks
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sedimentary rocks
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evaporites (1)
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clastic rocks
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sandstone (4)
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coal
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lignite (1)
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soils
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soils (1)
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Crossing Disciplines and Scales to Understand the Critical Zone
Origin of minerals in joint and cleat systems of the Pottsville Formation, Black Warrior basin, Alabama: Implications for coalbed methane generation and production
Lead and sulfur isotope investigation of Paleozoic sedimentary rocks from the southern Midcontinent of the United States; implications for paleohydrology and ore genesis of the Southeast Missouri lead belts
The potential role of magmatic gases in the genesis of Illinois-Kentucky fluorspar deposits; implications from chemical reaction path modeling
Abstract Post-depositional iron-sulfide (Fe-S) minerals that are related to hydrocarbon seepage have changed the original magnetizations at Cement oil field (Anadarko basin, Oklahoma), at Simpson oil field (North Slope basin, Alaska), and above deep Cretaceous oil and gas reservoirs, south Texas coastal plain. At Cement, ferrimagnetic pyrrhotite (Fe 7 S 8 ) formed with pyrite and marcasite in Permian red beds. The Fe-S minerals contain sulfur from two sources: (1) abiogenic sulfide, which has positive δ 34 S values, derived from thermochemical reduction of sulfate in deep reservoirs; and (2) biogenic sulfide, which has negative δ 34 S values, produced by reactions mediated by sulfate-reducing bacteria fed by leaking hydrocarbons. At Simpson, ferrimagnetic greigite (Fe 3 S 4 ) dominates magnetizations in nonmarine Upper Cretaceous clastic beds that contain epigenetic sulfide (δ 34 S > +20 per mil) and seeping biodegraded oil. In this setting, the authigenic magnetic sulfide mineral apparently incorporated sulfide produced by bacterial sulfate reduction under limited sulfate conditions. An inferred hydrocarbon food source for the sulfate-reducing bacteria links the hydrocarbon seepage to the greigite. The greigite is perhaps forming today. In middle Tertiary sandstones of southeast Texas, pyrite and marcasite formed when abiogenic H 2 S (enriched in 34 S) migrated upward from deep reservoirs, or when H 2 S (depleted in 34 S) was produced at shallow depths by bacteria that used organic material dissolved in migrating water from depth. The pyrite and marcasite replaced detrital magnetic iron-titanium oxide minerals. The degree of such replacement appears to increase toward faults that connect deep petroleum reservoirs to shallow sandstone. Our results show that abiologic and biologic mechanisms can generate different magnetic sulfide minerals in some sulfidic zones of hydrocarbon seepage. More commonly the magnetizations in such zones would be diminished as a result of the replacement of detrital magnetic minerals by the common nonmagnetic sulfide minerals, or would remain unchanged if such detrital minerals were originally absent.