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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Popigay Structure (1)
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Atlantic Ocean
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North Atlantic
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Blake Plateau
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Blake Nose (1)
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Flemish Cap (1)
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Jeanne d'Arc Basin (1)
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Labrador Sea (1)
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Northeast Atlantic
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Galicia Bank (3)
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Iberian abyssal plain (8)
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Northwest Atlantic (2)
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Rockall Plateau (1)
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South Atlantic
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Angola Basin (1)
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Walvis Ridge (1)
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Broken Ridge (1)
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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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Europe
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Southern Europe
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Iberian Peninsula
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Portugal (1)
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Grand Banks (1)
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Hudson Canyon (1)
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Indian Ocean
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Exmouth Plateau (1)
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Ninetyeast Ridge (1)
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Kerguelen Plateau (2)
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Lusitanian Basin (1)
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Newfoundland Basin (2)
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Pacific Ocean
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East Pacific
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Northeast Pacific (1)
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Southeast Pacific (1)
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Equatorial Pacific (1)
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North Pacific
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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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South Pacific
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Southeast Pacific (1)
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Southwest Pacific
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Lord Howe Rise (1)
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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 (1)
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Southern Ocean
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Weddell Sea
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Maud Rise (2)
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United States
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New Jersey (1)
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commodities
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petroleum (1)
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elements, isotopes
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isotope ratios (1)
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isotopes
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stable isotopes
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O-18/O-16 (1)
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metals
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platinum group
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iridium (1)
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oxygen
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O-18/O-16 (1)
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fossils
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Invertebrata
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Protista
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Foraminifera (2)
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microfossils (3)
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palynomorphs (1)
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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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Quaternary
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Pleistocene
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lower Pleistocene (1)
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Tertiary
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Paleogene
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lower Eocene (1)
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upper Eocene (1)
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Mesozoic
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Portlandian (1)
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Paleozoic
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Permian (1)
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igneous rocks
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igneous rocks
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plutonic rocks
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gabbros (1)
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ultramafics
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peridotites (1)
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metamorphic rocks
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metamorphic rocks
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metaigneous rocks
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serpentinite (1)
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metasomatic rocks
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serpentinite (1)
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turbidite (1)
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minerals
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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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Asia
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Popigay Structure (1)
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Atlantic Ocean
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North Atlantic
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Blake Plateau
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Blake Nose (1)
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Flemish Cap (1)
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Jeanne d'Arc Basin (1)
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Labrador Sea (1)
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Northeast Atlantic
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Galicia Bank (3)
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Iberian abyssal plain (8)
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Northwest Atlantic (2)
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Rockall Plateau (1)
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South Atlantic
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Angola Basin (1)
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Walvis Ridge (1)
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biogeography (1)
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Cenozoic
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Quaternary
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Pleistocene
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lower Pleistocene (1)
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Tertiary
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Paleogene
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lower Eocene (1)
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upper Eocene (1)
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Paleocene-Eocene Thermal Maximum (1)
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crust (3)
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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 73
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DSDP Site 522 (1)
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Leg 74
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DSDP Site 525 (1)
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Leg 78A
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DSDP Site 543 (1)
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Leg 81
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DSDP Site 553 (1)
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Leg 90
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DSDP Site 592 (1)
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Leg 93
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DSDP Site 605 (1)
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Leg 12
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DSDP Site 111 (1)
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Leg 24
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DSDP Site 237 (1)
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Leg 36
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DSDP Site 328 (1)
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Leg 40
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DSDP Site 362 (1)
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deformation (1)
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Europe
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Southern Europe
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Iberian Peninsula
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Portugal (1)
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faults (1)
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geophysical methods (4)
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igneous rocks
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plutonic rocks
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gabbros (1)
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ultramafics
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peridotites (1)
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Indian Ocean
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Exmouth Plateau (1)
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Ninetyeast Ridge (1)
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Invertebrata
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Protista
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Foraminifera (2)
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isotopes
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stable isotopes
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O-18/O-16 (1)
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mantle (3)
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Mesozoic
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Cretaceous
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Lower Cretaceous (1)
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Jurassic
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Upper Jurassic
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Portlandian (1)
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Tithonian (1)
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metals
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platinum group
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iridium (1)
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metamorphic rocks
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metaigneous rocks
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serpentinite (1)
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metasomatic rocks
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serpentinite (1)
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metamorphism (1)
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Mohorovicic discontinuity (2)
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Ocean Drilling Program
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Leg 103
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ODP Site 637 (1)
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ODP Site 638 (1)
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ODP Site 639 (1)
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ODP Site 640 (2)
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ODP Site 641 (1)
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Leg 105
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ODP Site 647 (1)
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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 112
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ODP Site 688 (1)
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Leg 113
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ODP Site 689 (1)
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ODP Site 690 (1)
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Leg 114
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ODP Site 699 (1)
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ODP Site 702 (1)
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ODP Site 703 (1)
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Leg 115
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ODP Site 709 (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 120
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ODP Site 748 (1)
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Leg 121
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ODP Site 752 (1)
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ODP Site 757 (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 145
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ODP Site 884 (1)
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Leg 149
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ODP Site 897 (1)
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ODP Site 898 (2)
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ODP Site 900 (2)
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ODP Site 901 (1)
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Leg 171B
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ODP Site 1053 (1)
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Leg 173
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ODP Site 1065 (1)
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ODP Site 1067 (1)
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ODP Site 1068 (1)
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ODP Site 1069 (1)
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ODP Site 1070 (1)
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Leg 174A
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ODP Site 1072 (1)
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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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Leg 199
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ODP Site 1220 (1)
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Leg 210 (1)
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ocean floors (2)
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orogeny (1)
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oxygen
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O-18/O-16 (1)
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Pacific Ocean
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East Pacific
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Northeast Pacific (1)
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Southeast Pacific (1)
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Equatorial Pacific (1)
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North Pacific
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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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South Pacific
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Southeast Pacific (1)
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Southwest Pacific
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Lord Howe Rise (1)
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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 (1)
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paleoecology (2)
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paleogeography (2)
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Paleozoic
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Permian (1)
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palynomorphs (1)
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petroleum (1)
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Plantae
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algae
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nannofossils (1)
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plate tectonics (3)
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sea-floor spreading (1)
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sea-level changes (1)
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sediments
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marine sediments (2)
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Southern Ocean
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Weddell Sea
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Maud Rise (2)
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tectonics (2)
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tektites (1)
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United States
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New Jersey (1)
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sedimentary rocks
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turbidite (1)
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sediments
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sediments
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marine sediments (2)
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turbidite (1)
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Leg 149
The continent-to-ocean transition in the Iberia Abyssal Plain
Eustatic sea-level controls on the flushing of a shelf-incising submarine canyon
Abstract We investigate the evolution of the Iberia–Newfoundland margin from Permian post-orogenic extension to Early Cretaceous break-up. We used a Quantitative Basin Analysis approach to integrate seismic stratigraphic interpretations and drill-hole data of two representative sections across the Iberia–Newfoundland margin with kinematic models for lithospheric thinning and subsequent flexural readjustment. We model the distribution of extension and thinning, palaeobathymetry, crustal structure, and subsidence and uplift history as functions of space and time. We start our modelling following post-orogenic extension, magmatic underplating and thermal re-equilibration of the Permian lithosphere. During the Late Triassic–Early Jurassic, broadly distributed, depth-independent lithospheric extension evolved into Late Jurassic–Early Cretaceous depth-dependent thinning as crustal extension progressed from distributed to focused deformation. During this time, palaeobathymetries rapidly deepened across the margin. Modelling of the southern and northern profiles highlighted the rapid development of crustal deformation from south to north over a 5–10 myr period, which accounts for the rapid change in Tithonian–Valanginian, deep- to shallow-water sedimentary facies between the Abyssal Plain and the adjacent Galicia Bank, respectively. Late-stage deformation of both margins was characterized by brittle deformation of the remaining continental crust, which led to exhumation of subcontinental mantle and, eventually, continental break-up and seafloor spreading.
Glomospira Acme During the Paleocene-Eocene Thermal Maximum: Response to CaCO 3 Dissolution or to Ecological Forces?
How does the continental crust thin in a hyperextended rifted margin? Insights from the Iberia margin
The extension discrepancy and syn-rift subsidence deficit at rifted margins
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.