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NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Atlantic Ocean
-
North Atlantic
-
Great Bahama Bank (1)
-
Gulf of Mexico
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Florida Bay (1)
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-
Little Bahama Bank (1)
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Straits of Florida (1)
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-
-
Mexico
-
Baja California (1)
-
Baja California Mexico (2)
-
-
North America
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Appalachian Basin (1)
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Gulf Coastal Plain (1)
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Michigan Basin (4)
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Rocky Mountains
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U. S. Rocky Mountains
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Uinta Mountains (1)
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-
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South America
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Brazil
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Rio de Janeiro Brazil (1)
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-
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United States
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Arkansas (1)
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Cincinnati Arch (1)
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Colorado (1)
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Colorado Plateau (1)
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Illinois (3)
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Illinois Basin (4)
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Indiana
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Steuben County Indiana (1)
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Kentucky (1)
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Louisiana
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Terrebonne Parish Louisiana (1)
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Michigan
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Michigan Lower Peninsula
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Alpena County Michigan (1)
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Cheboygan County Michigan (1)
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Emmet County Michigan (1)
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Ingham County Michigan (1)
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Manistee County Michigan (1)
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Montmorency County Michigan (1)
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Washtenaw County Michigan (1)
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Michigan Upper Peninsula
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Luce County Michigan (1)
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-
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Midcontinent (3)
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Mississippi Delta (1)
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Mississippi Valley
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Upper Mississippi Valley (1)
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Missouri
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Viburnum Trend (1)
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Ohio (2)
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U. S. Rocky Mountains
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Uinta Mountains (1)
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Uinta Basin (1)
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Utah (1)
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Western U.S. (1)
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-
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commodities
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barite deposits (1)
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brines (7)
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metal ores
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lead-zinc deposits (1)
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mineral deposits, genesis (1)
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oil and gas fields (1)
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petroleum
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natural gas
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coalbed methane (2)
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-
-
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elements, isotopes
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carbon
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C-13/C-12 (6)
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chemical ratios (4)
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halogens
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bromine
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bromide ion (2)
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chlorine
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chloride ion (2)
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fluorine
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fluoride ion (1)
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hydrogen
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D/H (3)
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deuterium (2)
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isotope ratios (9)
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isotopes
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stable isotopes
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C-13/C-12 (6)
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D/H (3)
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deuterium (2)
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O-18/O-16 (5)
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S-34/S-32 (1)
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Sr-87/Sr-86 (2)
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metals
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alkali metals
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potassium (1)
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sodium (3)
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alkaline earth metals
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calcium
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Mg/Ca (1)
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magnesium
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Mg/Ca (1)
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strontium
-
Sr-87/Sr-86 (2)
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-
-
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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 (1)
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-
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fossils
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Invertebrata
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Protista
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Foraminifera (1)
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-
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microfossils (3)
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Plantae
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algae
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Chlorophyta
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Chlorophyceae
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Codiaceae
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Halimeda (2)
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-
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thallophytes (2)
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geologic age
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Cenozoic
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Quaternary
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Holocene (3)
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Tertiary
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Paleogene
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Eocene
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Green River Formation (1)
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Paleocene
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lower Paleocene
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K-T boundary (1)
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Wasatch Formation (1)
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Mesozoic
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Cretaceous
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Upper Cretaceous
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K-T boundary (1)
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Mesaverde Group (1)
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-
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Jurassic
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Upper Jurassic
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Smackover Formation (1)
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Paleozoic
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Devonian
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Upper Devonian (2)
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New Albany Shale (2)
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Ordovician
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Middle Ordovician
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Galena Dolomite (1)
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Upper Ordovician
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Maquoketa Formation (1)
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upper Paleozoic
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Antrim Shale (4)
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minerals
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carbonates
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aragonite (3)
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calcite (4)
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dolomite (1)
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magnesian calcite (3)
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minerals (1)
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silicates
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aluminosilicates (1)
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sheet silicates
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chlorite group
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chlorite (1)
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clay minerals
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smectite (1)
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corrensite (1)
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illite (1)
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-
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sulfides
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galena (1)
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-
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Primary terms
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Atlantic Ocean
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North Atlantic
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Great Bahama Bank (1)
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Gulf of Mexico
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Florida Bay (1)
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Little Bahama Bank (1)
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Straits of Florida (1)
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-
-
barite deposits (1)
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brines (7)
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carbon
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C-13/C-12 (6)
-
-
Cenozoic
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Quaternary
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Holocene (3)
-
-
Tertiary
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Paleogene
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Eocene
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Green River Formation (1)
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Paleocene
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lower Paleocene
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K-T boundary (1)
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-
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Wasatch Formation (1)
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-
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clay mineralogy (1)
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crystal growth (1)
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diagenesis (10)
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geochemistry (15)
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ground water (6)
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hydrogen
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D/H (3)
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deuterium (2)
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hydrology (1)
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inclusions
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fluid inclusions (1)
-
-
Invertebrata
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Protista
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Foraminifera (1)
-
-
-
isotopes
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stable isotopes
-
C-13/C-12 (6)
-
D/H (3)
-
deuterium (2)
-
O-18/O-16 (5)
-
S-34/S-32 (1)
-
Sr-87/Sr-86 (2)
-
-
-
Mesozoic
-
Cretaceous
-
Upper Cretaceous
-
K-T boundary (1)
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Mesaverde Group (1)
-
-
-
Jurassic
-
Upper Jurassic
-
Smackover Formation (1)
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-
-
-
metal ores
-
lead-zinc deposits (1)
-
-
metals
-
alkali metals
-
potassium (1)
-
sodium (3)
-
-
alkaline earth metals
-
calcium
-
Mg/Ca (1)
-
-
magnesium
-
Mg/Ca (1)
-
-
strontium
-
Sr-87/Sr-86 (2)
-
-
-
-
Mexico
-
Baja California (1)
-
Baja California Mexico (2)
-
-
mineral deposits, genesis (1)
-
minerals (1)
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North America
-
Appalachian Basin (1)
-
Gulf Coastal Plain (1)
-
Michigan Basin (4)
-
Rocky Mountains
-
U. S. Rocky Mountains
-
Uinta Mountains (1)
-
-
-
-
oil and gas fields (1)
-
oxygen
-
O-18/O-16 (5)
-
-
paleoecology (1)
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Paleozoic
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Devonian
-
Upper Devonian (2)
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-
New Albany Shale (2)
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Ordovician
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Middle Ordovician
-
Galena Dolomite (1)
-
-
Upper Ordovician
-
Maquoketa Formation (1)
-
-
-
upper Paleozoic
-
Antrim Shale (4)
-
-
-
petroleum
-
natural gas
-
coalbed methane (2)
-
-
-
Plantae
-
algae
-
Chlorophyta
-
Chlorophyceae
-
Codiaceae
-
Halimeda (2)
-
-
-
-
-
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sea water (4)
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sedimentary petrology (1)
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sedimentary rocks
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carbonate rocks (3)
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chemically precipitated rocks
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evaporites (1)
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clastic rocks
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black shale (3)
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shale (1)
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sedimentary structures
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biogenic structures (1)
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sedimentation (2)
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sediments
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carbonate sediments (1)
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clastic sediments
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drift (1)
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outwash (1)
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marine sediments (4)
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soils (1)
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South America
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Brazil
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Rio de Janeiro Brazil (1)
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sulfur
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S-34/S-32 (1)
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thallophytes (2)
-
United States
-
Arkansas (1)
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Cincinnati Arch (1)
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Colorado (1)
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Colorado Plateau (1)
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Illinois (3)
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Illinois Basin (4)
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Indiana
-
Steuben County Indiana (1)
-
-
Kentucky (1)
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Louisiana
-
Terrebonne Parish Louisiana (1)
-
-
Michigan
-
Michigan Lower Peninsula
-
Alpena County Michigan (1)
-
Cheboygan County Michigan (1)
-
Emmet County Michigan (1)
-
Ingham County Michigan (1)
-
Manistee County Michigan (1)
-
Montmorency County Michigan (1)
-
Washtenaw County Michigan (1)
-
-
Michigan Upper Peninsula
-
Luce County Michigan (1)
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-
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Midcontinent (3)
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Mississippi Delta (1)
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Mississippi Valley
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Upper Mississippi Valley (1)
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-
Missouri
-
Viburnum Trend (1)
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Ohio (2)
-
U. S. Rocky Mountains
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Uinta Mountains (1)
-
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Uinta Basin (1)
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Utah (1)
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Western U.S. (1)
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-
weathering (1)
-
-
sedimentary rocks
-
sedimentary rocks
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carbonate rocks (3)
-
chemically precipitated rocks
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evaporites (1)
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-
clastic rocks
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black shale (3)
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shale (1)
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-
-
siliciclastics (1)
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-
sedimentary structures
-
sedimentary structures
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biogenic structures (1)
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-
-
sediments
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sediments
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carbonate sediments (1)
-
clastic sediments
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drift (1)
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outwash (1)
-
-
marine sediments (4)
-
-
siliciclastics (1)
-
-
soils
-
soils (1)
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Hydrogeochemistry and gas compositions of the Uinta Basin: A regional-scale overview
Identification of microbial and thermogenic gas components from Upper Devonian black shale cores, Illinois and Michigan basins
The carbonate system geochemistry of shallow groundwater–surface water systems in temperate glaciated watersheds (Michigan, USA): Significance of open-system dolomite weathering
Role of sulfide oxidation in dolomitization: Sediment and pore-water geochemistry of a modern hypersaline lagoon system
Extensive microbial modification of formation water geochemistry: Case study from a Midcontinent sedimentary basin, United States
The modern shallow-platform, calcium-carbonate–dominated sediments of the Florida Keys (Florida Bay and Atlantic reef tract) are diverse in their biological, sedimentological, and geochemical properties. Sites of intense bioturbation and thick seagrass cover are pervasive within Florida Bay and are often characterized by appreciable early diagenetic aragonite dissolution. Additional, less common sites show atypical diagenetic profiles that suggest strong reworking and/or very rapid deposition of the upper sediment layer extending to a depth of at least 20 cm. Diagenesis in these seagrass-free areas is dominated by rapid burial of labile organic matter that would otherwise be degraded aerobically under conditions of slower burial. Correspondingly, these oozy, water-rich sediments display anomalously high rates of microbial decomposition as recorded in 35 S-sulfate reduction rates and patterns of sulfate depletion, high dissolved sulfide concentrations in excess of several millimolar (mM), and elevated alkalinities. Unlike many sites in Florida Bay where solute concentrations suggest volumetrically significant net dissolution of metastable carbonate phases, dramatic increases in carbonate alkalinity from organic matter oxidation during bacterial sulfate reduction support net precipitation of CaCO 3 in the highly reactive surface layer. This early carbonate mineralization is indicated by measured depletions in Ca approaching 4 mM relative to overlying seawater. Geochemical signatures of sediment reworking or rapid sedimentation are corroborated by porosity trends; visual evaluations, including X-radiography; and an interval of essentially constant 210 Pb activity. Rapid burial within the reactive layer gives rise to restricted-system diagenetic behavior that is recorded in the sulfur isotope compositions of dissolved sulfate and sulfide. Nevertheless, despite strong 34 S enrichments in the pore-water sulfate and clear evidence for diagenetic calcium carbonate precipitation, carbonate-associated sulfate (CAS) trapped within the muds (at concentrations from ∼2400 to 4200 ppm) preserves the original 34 S/ 32 S ratio of the overlying seawater. Such preservation of the δ 34 S of seawater sulfate in bulk lime mud samples—even in the presence of appreciable diagenetic overprinting—confirms the broad utility of the CAS approach in reconstructing ancient ocean chemistry.
Microbial production and modification of gases in sedimentary basins: A geochemical case study from a Devonian shale gas play, Michigan basin
K Uptake by Modern Estuarine Sediments During Early Marine Diagenesis, Mississippi Delta Plain, Louisiana, U.S.A.
Significance of early-diagenetic water-rock interactions in a modern marine siliciclastic/evaporite environment: Salina Ometepec, Baja California
Mg-smectite authigenesis in a marine evaporative environment, Salina Ometepec, Baja California
STEM/AEM evidence for preservation of burial diagenetic fabrics in Devonian shales; implications for fluid/rock interaction in cratonic basins (U.S.A.)
Abstract Organic-rich Late Devonian Antrim and New Albany Shales are important hydrocarbon source rocks in the Michigan and Illinois Basins. These shales have been investigated using STEM/AEM and SEM techniques to clarify textures and mutual genetic relations between the low to moderately mature organic matter (R 0 = 0.45–0.6 %) and authigenic illite-rich clays. The Antrim and New Albany Shales contain up to 15 wt % TOC dominated by the marine algae Tasmanites. Organic matter forms an interconnected network within the clay-rich matrix with no detectable intergranular pore space even at the STEM scale. The clay-rich matrix is principally illite-rich mixed-layer I/S. Crystal sizes, compositions, defect states and presence of smectite interlayers are consistent with authigenesis of illite from precursor smectite with subsequent preservation of that immature, diagenetic illite after neoformation. Textural relations verify that gas transport from the Antrim Shale source occurs via desorption from organic matter and diffusion through the interconnected organic and authigenic illite matrix to open fractures. In both the Antrim and New Albany Shales, plastic deformation of organic material entrains illite crystals, suggesting that illite formation preceded or was concurrent with thermal maturation of organic matter. Based on existing thermal maturity data, illite authigenesis occurred prior to Late Pennsylvanian/Early Permian time at depths less than ˜2000 m and temperatures less than ˜120°C. In contrast to the Gulf Coast Tertiary sequence, fluids derived from smectite dehydration were probably not a significant driving force for primary hydrocarbon migration from these intracratonic basin shales as a result of the presence of relatively thin shale sequences and normal pressures during burial compaction.