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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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East Africa
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Tanzania (1)
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Asia
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Indian Peninsula
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India (1)
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Popigay Structure (1)
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Atlantic Ocean
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Equatorial Atlantic (1)
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Mid-Atlantic Ridge (1)
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North Atlantic
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Blake Plateau
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Blake Nose (1)
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Caribbean Sea (1)
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Labrador Sea (1)
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Northeast Atlantic
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Iberian abyssal plain (1)
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Sierra Leone Rise (1)
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South Atlantic
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Angola Basin (1)
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Cape Basin (1)
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Rio Grande Rise (1)
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Walvis Ridge (1)
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-
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Commonwealth of Independent States
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Russian Federation
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Popigay Structure (1)
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-
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Indian Ocean
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Exmouth Plateau (1)
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Ninetyeast Ridge (1)
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Somali Basin (2)
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West Indian Ocean (1)
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Indian Ocean Islands
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Maldive Islands (1)
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Mascarene Islands
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Reunion (1)
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-
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Kerguelen Plateau (1)
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Pacific Ocean
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East Pacific
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Northeast Pacific (1)
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North Pacific
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Mid-Pacific Mountains (1)
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Northeast Pacific (1)
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Northwest Pacific
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Emperor Seamounts (1)
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Shatsky Rise (1)
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-
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South Pacific
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Southwest Pacific
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Lord Howe Rise (2)
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-
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West Pacific
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Northwest Pacific
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Emperor Seamounts (1)
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Shatsky Rise (1)
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Southwest Pacific
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Lord Howe Rise (2)
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Southern Ocean
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Weddell Sea
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Maud Rise (1)
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elements, isotopes
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carbon
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C-13/C-12 (1)
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isotope ratios (2)
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isotopes
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stable isotopes
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C-13/C-12 (1)
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O-18/O-16 (2)
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Sr-87/Sr-86 (1)
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-
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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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-
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gold (1)
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platinum group
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iridium (2)
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palladium (1)
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platinum (1)
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rhodium (1)
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ruthenium (1)
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-
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oxygen
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O-18/O-16 (2)
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fossils
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Invertebrata
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Protista
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Foraminifera
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Rotaliina
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Globigerinacea
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Globigerinidae
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Globigerina (1)
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microfossils (7)
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Plantae
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algae
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nannofossils (1)
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geologic age
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Cenozoic
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Tertiary
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Neogene
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Miocene
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lower Miocene (2)
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-
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Paleogene
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Eocene
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upper Eocene (1)
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Oligocene
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upper Oligocene (1)
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Paleocene
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lower Paleocene
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K-T boundary (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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igneous rocks
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igneous rocks
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volcanic rocks
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basalts
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flood basalts (1)
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ocean-island basalts (1)
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tholeiite (1)
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tholeiitic basalt (1)
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minerals
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carbonates
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aragonite (1)
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calcite (1)
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siderite (1)
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silicates
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chain silicates
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pyroxene group
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clinopyroxene (1)
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framework silicates
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silica minerals
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coesite (1)
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quartz (1)
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Primary terms
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Africa
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East Africa
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Tanzania (1)
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Asia
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Indian Peninsula
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India (1)
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Popigay Structure (1)
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Atlantic Ocean
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Equatorial Atlantic (1)
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Mid-Atlantic Ridge (1)
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North Atlantic
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Blake Plateau
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Blake Nose (1)
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Caribbean Sea (1)
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Labrador Sea (1)
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Northeast Atlantic
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Iberian abyssal plain (1)
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Sierra Leone Rise (1)
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South Atlantic
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Angola Basin (1)
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Cape Basin (1)
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Rio Grande Rise (1)
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Walvis Ridge (1)
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-
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carbon
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C-13/C-12 (1)
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Cenozoic
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Tertiary
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Neogene
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Miocene
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lower Miocene (2)
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-
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Paleogene
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Eocene
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upper Eocene (1)
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Oligocene
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upper Oligocene (1)
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Paleocene
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lower Paleocene
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K-T boundary (1)
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crystal growth (1)
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data processing (1)
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Deep Sea Drilling Project
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IPOD
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Leg 48
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DSDP Site 400 (1)
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Leg 72
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DSDP Site 516 (1)
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Leg 73
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DSDP Site 522 (1)
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Leg 74
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DSDP Site 526 (1)
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DSDP Site 529 (1)
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Leg 78A
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DSDP Site 543 (1)
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Leg 80
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DSDP Site 548 (1)
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Leg 82
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DSDP Site 563 (1)
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Leg 90
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DSDP Site 588 (1)
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DSDP Site 592 (1)
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Leg 94
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DSDP Site 608 (1)
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DSDP Site 610 (1)
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-
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Leg 12
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DSDP Site 111 (1)
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Leg 15
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DSDP Site 151 (1)
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Leg 22
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DSDP Site 216 (1)
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Leg 24
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DSDP Site 237 (3)
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Leg 3
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DSDP Site 17 (1)
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Leg 40
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DSDP Site 360 (1)
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DSDP Site 363 (1)
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Leg 42A
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DSDP Site 372 (1)
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-
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diagenesis (1)
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geochemistry (3)
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geophysical methods (1)
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igneous rocks
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volcanic rocks
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basalts
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flood basalts (1)
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ocean-island basalts (1)
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tholeiite (1)
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tholeiitic basalt (1)
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-
-
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Indian Ocean
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Exmouth Plateau (1)
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Ninetyeast Ridge (1)
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Somali Basin (2)
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West Indian Ocean (1)
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-
Indian Ocean Islands
-
Maldive Islands (1)
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Mascarene Islands
-
Reunion (1)
-
-
-
Invertebrata
-
Protista
-
Foraminifera
-
Rotaliina
-
Globigerinacea
-
Globigerinidae
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Globigerina (1)
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-
-
-
-
-
-
isotopes
-
stable isotopes
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C-13/C-12 (1)
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O-18/O-16 (2)
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Sr-87/Sr-86 (1)
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-
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lava (1)
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magmas (2)
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mantle (2)
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maps (1)
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marine geology (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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-
-
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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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-
-
gold (1)
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platinum group
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iridium (2)
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palladium (1)
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platinum (1)
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rhodium (1)
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ruthenium (1)
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-
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metamorphism (1)
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Ocean Drilling Program
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Leg 105
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ODP Site 647 (1)
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Leg 108
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ODP Site 667 (2)
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Leg 110
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ODP Site 672 (1)
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ODP Site 674 (1)
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Leg 113
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ODP Site 689 (1)
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Leg 114
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ODP Site 699 (1)
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ODP Site 703 (1)
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-
Leg 115
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ODP Site 706 (2)
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ODP Site 707 (7)
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ODP Site 709 (6)
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ODP Site 710 (2)
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ODP Site 713 (2)
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ODP Site 714 (2)
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ODP Site 715 (4)
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ODP Site 716 (1)
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Leg 119
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ODP Site 738 (1)
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ODP Site 744 (1)
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Leg 121
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ODP Site 757 (1)
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ODP Site 758 (1)
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Leg 122
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ODP Site 762 (1)
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ODP Site 763 (1)
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Leg 125
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ODP Site 782 (1)
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ODP Site 786 (1)
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-
Leg 143
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ODP Site 865 (1)
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-
Leg 145
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ODP Site 884 (1)
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-
Leg 149
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ODP Site 900 (1)
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-
Leg 171B
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ODP Site 1053 (1)
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Leg 174A
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ODP Site 1073 (1)
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Leg 177
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ODP Site 1090 (1)
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-
Leg 198
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ODP Site 1209 (1)
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ODP Site 1210 (1)
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Leg 208
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ODP Site 1264 (1)
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ODP Site 1265 (1)
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-
-
ocean floors (1)
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oxygen
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O-18/O-16 (2)
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-
Pacific Ocean
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East Pacific
-
Northeast Pacific (1)
-
-
North Pacific
-
Mid-Pacific Mountains (1)
-
Northeast Pacific (1)
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Northwest Pacific
-
Emperor Seamounts (1)
-
Shatsky Rise (1)
-
-
-
South Pacific
-
Southwest Pacific
-
Lord Howe Rise (2)
-
-
-
West Pacific
-
Northwest Pacific
-
Emperor Seamounts (1)
-
Shatsky Rise (1)
-
-
Southwest Pacific
-
Lord Howe Rise (2)
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-
-
-
paleoecology (2)
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paleogeography (1)
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Plantae
-
algae
-
nannofossils (1)
-
-
-
plate tectonics (2)
-
sea water (1)
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sea-floor spreading (1)
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sedimentary rocks
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carbonate rocks (1)
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-
sediments
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carbonate sediments (1)
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Southern Ocean
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Weddell Sea
-
Maud Rise (1)
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-
-
tektites (1)
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-
rock formations
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Deccan Traps (1)
-
-
sedimentary rocks
-
sedimentary rocks
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carbonate rocks (1)
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-
-
sediments
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sediments
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carbonate sediments (1)
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-
Leg 115
Alicantina , A New Eocene Planktonic Foraminiferal Genus For the Lozanoi Group
In order to better define the late Eocene clinopyroxene-bearing (cpx) spherule layer and to determine how the ejecta vary with distance from the presumed source crater (Popigai), we searched for the layer at 23 additional sites. We identified the layer at six (maybe seven) of these sites: Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) Holes 592, 699A, 703A, 709C, 786A, 1090B, and probably 738B. The cpx spherule layer occurs in magnetochron 16n.1n, which indicates an age of ca. 35.4 ± 0.1 Ma for the layer. We found the highest abundance of cpx spherules and associated microtektites in Hole 709C in the northwest Indian Ocean, and we found coesite and shocked quartz in the cpx spherule layer at this site. We also found coesite in the cpx spherule layer at Site 216 in the northeast Indian Ocean. This is the first time that coesite has been found in the cpx spherule layer, and it provides additional support for the impact origin of this layer. In addition, the discovery of coesite and shocked quartz grains (with planar deformation features [PDFs]) supports the conclusion that the pancake-shaped clay spherules associated with quartz grains exhibiting PDFs are diagenetically altered cpx spherules. An Ir anomaly was found associated with the cpx spherule layer at all four of the new sites (699A, 709C, 738B, 1090B) for which we obtained Ir data. The geometric mean of the Ir fluence for the 12 sites with Ir data is 5.7 ng/cm 2 , which is ~10% of the fluence estimated for the Cretaceous-Tertiary boundary. Based on the geographic distribution of the 23 sites now known to contain the cpx spherule layer, and 12 sites where we have good chronostratigraphy but the cpx spherule layer is apparently absent, we propose that the cpx spherule strewn field may have a ray-like distribution pattern. Within one of the rays, the abundance of spherules decreases and the percent microtektites increases with distance from Popigai. Shocked quartz and coesite have been found only in this ray at the two sites that are closest to Popigai. At several sites in the Southern Ocean, an increase in δ 18 O in the bulk carbonate occurs immediately above the cpx spherule layer. This increase may indicate a drop in temperature coincident with the impact that produced the cpx spherule layer.
DISTRIBUTION AND ECOLOGY OF CATAPSYDRAX INDIANUS , A NEW PLANKTONIC FORAMINIFER INDEX SPECIES FOR THE LATE OLIGOCENE–EARLY MIOCENE
Emendation of the genus Streptochilus (Foraminifera) and new species from the lower Miocene of the Atlantic and Indian Oceans
Abstract Shallow-water carbonate sediments deposited in tropical and subtropical settings form thick and spatially extensive accumulations referred to as “carbonate platforms.” Carbonate platforms typically have life spans of millions of tens of milliions of years, and their birth, growth, and demise are governed by a combination of factors such as tectonics, eustasy, environmental conditions, and climate. Carbonate platforms contain an archive of variations of these factors through time in its sedimentary record. These changes can then be extracted from this record, providing insight into our understanding of sedimentary processes and enhancing our knowledge of earth’s history. This study examines the stratigraphy and evolution of the Maldives isolated carbonate platform, in the equatorial Indian Ocean. The Maldives platform is unique because of its enormous size (800 x 130 km). It is the second-largest modern isolated carbonate platform (after the Bahamas). Established in the early Eocene and now more than 3 km thick, the platform contains a sedimentary record which spans more than 50 million years. This study is based on interpretation of the regional 2-D seismic data set and data from one deep exploration well that resulted from Royal Dutch/Shell during its exploration campaign in 1989-1991. The excellent quality and the vast volume (6000km of seismic data) allowed the authors to conduct a detailed study of the Maldives platform.