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Improving Antarctic Sediment 14C Dating Using Ramped Pyrolysis: An Example from the Hugo Island Trough

Published online by Cambridge University Press:  19 January 2016

Brad E Rosenheim ,
Jennifer A Santoro ,
Madeleine Gunter  and
Eugene W Domack
Brad E Rosenheim*
Affiliation:
1Department of Earth and Environmental Sciences, Tulane University, New Orleans, Louisiana, USA
Jennifer A Santoro*
Affiliation:
2Department of Geosciences, Hamilton College, Clinton, New York, USA
Madeleine Gunter*
Affiliation:
2Department of Geosciences, Hamilton College, Clinton, New York, USA
Eugene W Domack
Affiliation:
2Department of Geosciences, Hamilton College, Clinton, New York, USA
*
Corresponding author. Email: brosenhe@tulane.edu.
3Presently at Nicholas School of the Environment, Duke University, Durham, North Carolina, USA.
4Presently at Department of Anthropology, College of William and Mary, Williamsburg, Virginia, USA.
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Abstract

To improve the chronology of sediments containing information about Holocene ice shelf and oceanic dynamics in the vicinity of the Antarctic Peninsula, we compare bulk acid-insoluble radiocarbon dating to ramped pyrolysis 14C dating in a sediment core containing ample organic material. This core spans the last 12,000 yr of open-shelf sedimentation in the Bellingshausen Sea, western Antarctic Peninsula. By estimating the spectrum of 14C ages within a given core horizon, the ramped pyrolysis 14C method separates organic carbon relative to thermal stability, isolating younger parts of the mixture from older ones and providing an estimate of the geological uncertainty inherent in a bulk 14C age. Employing the ramped pyrolysis 14C method to this core demonstrates variable bulk 14C age bias and increasing age spectrum downcore, neither of which can be associated with major changes in lithology of the core. The chronology of the sediment core using the youngest ages from the ramped pyrolysis technique allows for correlation between nearby Palmer Deep sediments and these sediments from the Hugo Island Trough.

Type
Articles
Information
Radiocarbon , Volume 55 , Issue 1 , 2013 , pp. 115 - 126
Copyright
Copyright © 2013 by the Arizona Board of Regents on behalf of the University of Arizona 

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