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- W1592793283 abstract "ODP Site 1165, located 400 km northwest of Prydz Bay, contains a high‐resolution early Miocene record of pulses of ice‐rafted debris (IRD) originating from the ancestral Lambert Glacier system and the Antarctic coast to the east. The 520 m of early Miocene sediments consist of dark gray claystone with silt laminae (contourites) alternating with decimeter‐scale layers of greenish‐gray bioturbated claystone that commonly contain ice‐rafted debris. Downhole logs also record the alternations between the two facies: the IRD‐bearing greenish‐grey claystone corresponds to high resistivity and density values because of increased cementation by silica, and corresponds to lower natural gamma radiation values because of diluted clay content. The downhole logs thus allow a continuous and detailed stratigraphic record of the IRD‐bearing layers to be obtained. The IRD‐bearing layers represent deglaciations and interglacials, when a high flux of icebergs with incorporated material were melting out over the site; the contourite‐rich layers represent glacials, when the Polar Current over the site was relatively strong. The sequence is dated by magnetostratigraphy, and the timing of the major IRD pulses is paced by orbital eccentricity, indicating that the volume of the East Antarctic ice sheet also fluctuates on this timescale. After 19.7 Ma, minor precessional and subprecessional IRD layers appear in the record, indicating that the ice sheet becomes more prone to deglaciation through this interval, perhaps associated with the gradual warming trend through the early Miocene." @default.
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- W1592793283 date "2005-06-01" @default.
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- W1592793283 title "A high-resolution record of early Miocene Antarctic glacial history from ODP Site 1165, Prydz Bay" @default.
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- W1592793283 doi "https://doi.org/10.1029/2004pa001067" @default.
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