Orbitally Paced Sedimentary Cycles from the Lower Oligocene Antarctic Margin as a Record of Ice Sheet Variability: a Comparison of Field Data and Simulated Ice Sheet Behavior

Details Orbitally Paced Sedimentary Cycles from the Lower Oligocene Antarctic Margin as a Record of Ice Sheet Variability: a Comparison of Field Data and Simulated Ice Sheet Behavior Orbitally Paced Sedimentary Cycles from the Lower Oligocene Antarctic Margin as a Record of Ice Sheet Variability: a Comparison of Field Data and Simulated Ice Sheet Behavior

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmpp51c0621g&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #PP51C-0621

Astronomy and Astrophysics

Astronomy

4900 Paleoceanography (0473, 3344), 4910 Astronomical Forcing, 4928 Global Climate Models (1626, 3337)

Scientific paper

The vertical distribution of lithofacies from glacimarine sequences recovered during the Cape Roberts Project displays a cyclicicty which is interpreted as the sedimentary response to changes in relative sea-level. The changes are associated with climatic cycles and/or cycles of glacial advance and retreat (CRP Science team, 2000). Based on available bio- and magnetostratigraphic data (CRP Science Team, 2001; Florindo et al., 2005) the CRP-3 core spans the upper part of Chron C13r to the uppermost Chron C12r. The sequence is, therefore, a unique archive containing information on ice-sheet volume changes across a major step of glaciation as revealed by the stable isotope record from oceanic sequences. Image analysis data from CRP-3 core reveals a cyclical pattern, which based on the current age interpretation of the surveyed interval, appear to be orbitally controlled. These results are compared with simulated long-term (104-106 yr) behavior of the ice sheet using a coupled GCM-ice sheet-sediment model accounting for lower Oligocene boundary conditions and orbital forcing.

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