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Compound-Specific 14C Dating of IODP Expedition 318 Core U1357A Obtained Off the Wilkes Land Coast, Antarctica

Published online by Cambridge University Press:  26 July 2016

Masako Yamane ,
Yusuke Yokoyama ,
Yosuke Miyairi ,
Hisami Suga ,
Hiroyuki Matsuzaki ,
Robert B Dunbar  and
Naohiko Ohkouchi
Masako Yamane
Affiliation:
Atmosphere and Ocean Research Institute, University of Tokyo, 5–1-5 Kashiwanoha, Chiba 277–8564, Japan
Yusuke Yokoyama
Affiliation:
Atmosphere and Ocean Research Institute, University of Tokyo, 5–1-5 Kashiwanoha, Chiba 277–8564, Japan Department of Earth and Planetary Sciences, University of Tokyo, 7–3-1 Hongo, Bunkyo-ku, Tokyo 113–0033, Japan Japan Agency for Marine-Earth Science and Technology, 2–15 Natsushima-cho, Yokosuka 237–0061, Japan
Yosuke Miyairi
Affiliation:
Atmosphere and Ocean Research Institute, University of Tokyo, 5–1-5 Kashiwanoha, Chiba 277–8564, Japan
Hisami Suga
Affiliation:
Japan Agency for Marine-Earth Science and Technology, 2–15 Natsushima-cho, Yokosuka 237–0061, Japan
Hiroyuki Matsuzaki
Affiliation:
Department of Nuclear Engineering and Management, University of Tokyo, 2–11–16 Yayoi, Bunkyo-ku, Tokyo 113–0032, Japan
Robert B Dunbar
Affiliation:
Department of Environmental Earth System Science, Stanford University, 326 Braun Hall, Building 320, Stanford, CA 94305–2115, USA
Naohiko Ohkouchi
Affiliation:
Japan Agency for Marine-Earth Science and Technology, 2–15 Natsushima-cho, Yokosuka 237–0061, Japan
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Abstract

This study applied compound-specific radiocarbon analysis (CSRA) to a 186-m-long sediment core (U1357A) taken from Adélie Basin located on the continental shelf off Wilkes Land, East Antarctica. The CSRA targeted C16 fatty acid as well as C16., fatty acid and cyclopheophorbide-a-enol isolated from the sediment. Due to their high degradation rate, these compounds are expected to occur in low abundances in relict organic matter deposited at this site. Twelve compound-specific (CS) 14C ages were obtained that are mostly consistent with their stratigraphic order. The CS 14C results of all samples are Holocene in age (9800 to 440 cal BP). These results suggest that significant sedimentation started ∼10,000 cal BP. Moreover, the data suggest that 14C measurements of C16:1 fatty acid and cyclopheophorbide-a-enol are useful for dating sediments from the Southern Ocean.

Type
Articles
Information
Radiocarbon , Volume 56 , Issue 3 , 2014 , pp. 1009 - 1017
Copyright
Copyright © 2014 by the Arizona Board of Regents on behalf of the University of Arizona 

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