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Challenges in Radiocarbon Dating Organic Carbon in Opal-Rich Marine Sediments

Published online by Cambridge University Press:  18 July 2016

Yan Zheng ,
Robert F Anderson ,
Philip N Froelich ,
Warren Beck ,
Ann P McNichol  and
Thomas Guilderson
Yan Zheng
Affiliation:
Lamont-Doherty Earth Observatory and Department of Earth and Environmental Sciences, Columbia University, Palisades, New York 10964, USA
Robert F Anderson
Affiliation:
Lamont-Doherty Earth Observatory and Department of Earth and Environmental Sciences, Columbia University, Palisades, New York 10964, USA
Philip N Froelich
Affiliation:
School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
Warren Beck
Affiliation:
NSF-Arizona AMS Facility, University of Arizona, Tucson, Arizona 85721, USA
Ann P McNichol
Affiliation:
NOSAMS, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA
Thomas Guilderson
Affiliation:
Harvard University, Cambridge, Massachusetts 02138 and Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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Abstract

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We explored the reliability of radiocarbon ages obtained on organic carbon phases in opal-rich Southern Ocean sediments. Paired biogenic carbonate and total organic carbon (TOC) 14C analyses for three Southern Ocean cores showed that the TOC ages were systematically younger than the carbonate ages. Carbonate ages were consistent with oxygen isotopic and bio-stratigraphy, indicating error in TOC ages that could be explained by 5–24% of modern carbon contamination of TOC samples. Two possible sources of contamination are: 1) adsorption of atmospheric CO2 or volatile organic compounds to reactive opal surface sites, and 2) fixation of atmospheric CO2 by chemosynthetic bacteria during core storage. In an effort to reduce the modern carbon contamination, diatoms were separated from sediments, purified, and pre-oxidized by concentrated nitric and perchloric acids to permit dating of opal-intrinsic organic carbon (~0.1–0.3% by weight). 14C ages of chemically pre-oxidized opal showed a significant amount of modern carbon contamination, from 11 to 32%, indicating adsorption from the atmosphere of modern carbon onto opal surfaces that were previously cleaned by acid oxidation. Several experiments designed to eliminate the modern C contamination were attempted, but so far we have not been able to obtain a radiocarbon age on 14C-dead Southern Ocean opal-rich sediments, either bulk TOC or purified diatom opal samples, as old as our procedural blank.

Type
Articles
Information
Radiocarbon , Volume 44 , Issue 1 , 2002 , pp. 123 - 136
Copyright
Copyright © 2002 by the Arizona Board of Regents on behalf of the University of Arizona 

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