Williams, Trevor; Handwerger, David (2005): A high-resolution record of early Miocene Antarctic glacial history from ODP Site 1165, Prydz Bay. American Geophysical Union, Washington, DC, United States, Paleoceanography, 20 (2), georefid:2007-013353
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. (mod. journ. abst.)
Coverage:
West: 67.1300 East: 67.1400 North: -64.2200 South: -64.2300
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