Dating late Quaternary planktonic foraminifer Neogloboquadrina pachyderma from the Arctic Ocean using amino acid racemization

Kaufman, Darrell S. and Polyak, Leonid and Adler, Ruth and Channell, James E. T. and Xuan, Chuang (2008) Dating late Quaternary planktonic foraminifer Neogloboquadrina pachyderma from the Arctic Ocean using amino acid racemization. Paleoceanography, 23 (3). PA3224-PA3235. ISSN 1944-9186

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Abstract

The long-term rate of racemization for amino acids preserved in planktonic foraminifera was determined by using independently dated sediment cores from the Arctic Ocean. The racemization rates for aspartic acid (Asp) and glutamic acid (Glu) in the common taxon, were calibrated for the last 150 ka using 14C ages and the emerging Quaternary chronostratigraphy of Arctic Ocean sediments. An analysis of errors indicates realistic age uncertainties of about ±12% for Asp and ±17% for Glu. Fifty individual tests are sufficient to analyze multiple subsamples, identify outliers, and derive robust sample mean values. The new age equation can be applied to verify and refine age models for sediment cores elsewhere in the Arctic Ocean, a critical region for understanding the dynamics of global climate change.

Item Type:	Article
ID number or DOI:	10.1029/2008PA001618
Keywords:	amino acid racemization; Quaternary geochronology; Arctic Ocean; planktonic foraminifera
Subjects:	G Geography. Anthropology. Recreation > GE Environmental Sciences
Department/Unit:	College of Engineering, Forestry, and Natural Science > School of Earth Sciences and Environmental Sustainability
Date Deposited:	26 Jan 2016 20:58
URI:	http://openknowledge.nau.edu/id/eprint/1800

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