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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Antarctica
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Antarctic ice sheet
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East Antarctic ice sheet (1)
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East Antarctica (1)
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Victoria Land
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Cape Roberts (1)
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Asia
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Atlantic Ocean
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Labrador Sea (1)
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Northeast Atlantic
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South Atlantic
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Commonwealth of Independent States
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Russian Federation
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Indian Ocean
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Pacific Ocean
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North Pacific
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West Pacific
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elements, isotopes
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Primary terms
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Antarctica
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Antarctic ice sheet
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East Antarctica (1)
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Victoria Land
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Cape Roberts (1)
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Asia
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Popigay Structure (1)
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Atlantic Ocean
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Equatorial Atlantic (1)
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North Atlantic
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Blake Plateau
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Blake Nose (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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South Atlantic
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Angola Basin (1)
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carbon
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Cenozoic
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climate change (3)
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Deep Sea Drilling Project
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IPOD
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Leg 73
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DSDP Site 522 (1)
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Leg 78A
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DSDP Site 543 (1)
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Leg 90
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DSDP Site 592 (1)
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Leg 12
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DSDP Site 111 (1)
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glacial geology (1)
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igneous rocks
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volcanic rocks
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pyroclastics
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pumice (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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Mollusca
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Bivalvia (1)
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Protista
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Foraminifera
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Rotaliina
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Cassidulinacea
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Anomalinidae
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Cibicidoides (1)
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isotopes
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stable isotopes
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C-13/C-12 (2)
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O-18/O-16 (5)
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metals
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platinum group
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iridium (1)
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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 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 (2)
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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 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 (3)
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ODP Site 739 (1)
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ODP Site 742 (1)
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ODP Site 744 (2)
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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 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 900 (1)
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Leg 159
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ODP Site 959 (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 188
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ODP Site 1166 (1)
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oxygen
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O-18/O-16 (5)
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Pacific Ocean
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North Pacific
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Northwest Pacific
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Emperor Seamounts (1)
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South Pacific
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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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Southwest Pacific
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Lord Howe Rise (1)
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paleoclimatology (4)
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palynomorphs
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Dinoflagellata (1)
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Plantae
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algae
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diatoms (1)
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sediments
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marine sediments (4)
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Southern Ocean
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Prydz Bay (1)
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Ross Sea (1)
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Weddell Sea
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Maud Rise (2)
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tektites (1)
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weathering (2)
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sedimentary rocks
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volcaniclastics (1)
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sediments
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sediments
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marine sediments (4)
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volcaniclastics (1)
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Harmful algae and export production collapse in the equatorial Atlantic during the zenith of Middle Eocene Climatic Optimum warmth
An Antarctic stratigraphic record of stepwise ice growth through the Eocene-Oligocene transition
Abstract The Monte Cagnero sedimentary section, which crops out in the northeastern Apennines near Urbania in the Umbria–Marche Basin (Italy), contains well-exposed strata spanning the middle Eocene to lower Oligocene interval. We use an integrated magnetobiostratigraphic approach to generate a high-resolution age model for the Monte Cagnero section, with the goal of obtaining a reliable chronostratigraphic framework for studying Eocene–Oligocene palaeoceanographic changes during the switch from greenhouse to icehouse conditions. The studied sediments consist of alternating reddish and greenish limestones and marlstones. A new integrated age model for the section is based on high-resolution palaeomagnetic analyses, combined with detailed planktonic foraminiferal and calcareous nannofossil biostratigraphic results. Rock magnetic measurements show that the magnetic mineralogy is dominated by a mixture of high- and low-coercivity minerals, probably representing a combination of hematite and magnetite. A robust magnetostratigraphic signal, together with the identification of key planktonic foraminiferal and nannofossil biostratigraphic events, allows construction of a detailed age model for the section. Based on these results, we infer that the section spans a continuous interval (within magnetochron resolution) from the middle Eocene to lower Oligocene ( c . 41–27 Ma; Chrons C18r–C12r). The Monte Cagnero section, therefore, represents a sequence that is suitable for studying the impact of the Neo-Tethyan gateway closure on subtropical Eocene circulation and determining the nature and timing of palaeoceanographic changes in the Tethys through the late middle Eocene to early Oligocene interval.
Middle Eocene to early Oligocene magnetostratigraphy of ODP Hole 711A (Leg 115), western equatorial Indian Ocean
Abstract Ocean Drilling Program (ODP) Site 711, located in the western equatorial Indian Ocean near the Seychelles Archipelago on Madingley Rise, is an important site for studying middle Eocene to early Oligocene climatic evolution. This site is ideal for studying the impact of Neo-Tethyan gateway closure on Indian Ocean currents and circulation to further understand global climate changes through the greenhouse to icehouse transition. Middle Eocene-to-lower Oligocene strata recovered within Hole 711A (Cores 711A-14X to 21X) primarily consist of clay-bearing nannofossil oozes/chalks, with layers rich in radiolarians. Here, we report a high-resolution magnetostratigraphic record and a new integrated age model for the middle Eocene-to-lower Oligocene section of Hole 711A. Correlation of the polarity pattern to the geomagnetic polarity timescale provides a record from Chron C19r (middle Eocene) to C12r (early Oligocene). Our results extend the existing polarity record down into the middle Eocene and confirm published results from the lower Oligocene section of the hole. Overall, these new results from Hole 711A have important implications for identifying and dating global climate change events, and for reconstructing calcite compensation depth history at this site. Supplementary material: Magnetostratigraphic data used for construction of age models for Hole 711A included in this study are available at: http://www.geolsoc.org.uk/SUP18595
Two-stepping into the icehouse: East Antarctic weathering during progressive ice-sheet expansion at the Eocene–Oligocene transition
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.