Mathematics – Logic
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.u42a..10h&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #U42A-10
Mathematics
Logic
9310 Antarctica, 1208 Crustal Movements: Intraplate (8110), 1827 Glaciology (1863)
Scientific paper
Relative sea-level (RSL) curves produced from dated raised-beach ridges afford information concerning glacial isostasy and the timing of deglaciation. Here we present data from Terra Nova Bay (74o35'-75o00'S, 163o30-164o30'E) and the southern Scott Coast (76o30'-78o30'S, 163o-164oE) that allow us to reconstruct Holocene RSL changes along the western coast of the Ross Sea Embayment, Antarctica. During the last glacial maximum, the Ross Sea Embayment was filled with an extensive grounded ice sheet. Raised beaches, deltas, and marine sediments associated with retreat of this ice sheet occur up to 32 m elevation and are the subject of this study. Over seventy AMS radiocarbon dates of incorporated shells, seal skin, and seal and penguin remains afford a chronology for RSL curves along the southern Scott Coast. Final unloading of grounded Ross Sea ice occurred there shortly before 6500 14C yr B.P. (all ages have been corrected for an estimated 1300-yr marine-reservoir effect). This timing is consistent with glacial geologic evidence that places deglaciation of the same area between 5730 and 8340 14C yr B.P. Farther north at Terra Nova Bay, a new RSL curve, constrained by over sixty AMS radiocarbon dates of penguin guano and remains, seal skin, and shells, intersects the marine limit at about 7000 14C yr B.P. This age is consistent with other evidence for the timing of deglaciation at Terra Nova Bay, but is several thousand years younger than dates obtained from total organic carbon in marine sediment cores located nearby and from relict penguin rookeries farther south at Cape Hickey. The timing of deglaciation is critical for isolating the mechanism that forced retreat of the West Antarctic Ice Sheet grounding line to its present position at the Siple Coast. Our data strongly suggest Holocene grounding-line retreat, with much of the ice sheet, at least along the southern Scott Coast, still intact 7000 14C yr B.P. If correct, then ice recession to the present position may have been due largely to dynamic processes within the ice sheet itself, as other potential forcing (such as deglacial sea-level rise) essentially was accomplished by mid-Holocene time.
Baroni Carlo
Hall Björn
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