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Chronology of the Palmer Deep site, Antarctic Peninsula: a Holocene palaeoenvironmental reference for the circum-Antarctic

Department of Geology, Hamilton College, Clinton, New York 13323, USA

A. Leventer

Department of Geology, Colgate University, Hamilton, New York 13346, USA

R. Dunbar

Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305, USA

F. Taylor

Department of Geology, Hamilton College, Clinton, New York 13323, USA

S. Brachfeld

Institute for Rock Magnetism, University of Minnesota, Minneapolis, Minnesota 55455, USA

C. Sjunneskog

Institute of Earth Sciences, Uppsala University, Uppsala S-752 36, Sweden

Palmer Deep sediment cores are used to produce the first high-resolution, continuous late Pleistocene to Holocene time-series from the Antarctic marine system. The sedimentary record is dated using accelerator mass spectrometer radiocarbon methods on acid insoluble organic matter and foraminiferal calcite. Fifty-four radiocarbon analyses are utilized in the dating which provides a calibrated timescale back to 13 ka BP. Reliability of resultant ages on organic matter is assured because duplicates produce a standard deviation from the surface age of less than laboratory error (i.e., ±50 years). In addition, surface organic matter ages at the site are in excellent agreement with living calcite ages at the accepted reservoir age of 1260 years for the Antarctic Peninsula. Spectral analyses of the magnetic susceptibility record against the age model reveal unusually strong periodicity in the 400,–200 and 50-70 year frequency bands, similar to other high-resolution records from the Holocene but, so far, unique for the circum-Antarctic. Here we show that comparison to icecore records of specific climatic events (e.g., the ’Little Ice Age‘, Neoglacial, Hypsithermal, and the Bølling/Allerød to Younger Dryas transition) provides improved focus upon the relative timing of atmosphere/ocean changes between the northern anid southern high latitudes.

Key Words: chronology • spectral analysis • periodicity • Palmer Deep • Antarctic Peninsula • Holocene • radiocarbon • sedimentology

The Holocene, Vol. 11, No. 1, 1-9 (2001)
DOI: 10.1191/095968301673881493


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