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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 

References

Curthoys, G, Davydov, VY, Kiselev, AV, Kiselev, SA, Kuznetsov, B V. 1974. Hydrogen bonding in adsorption on silica. Journal of Colloidal and Interface Science 48: 58–72.CrossRefGoogle Scholar
Eglinton, TI, Benitez-Nelson, BC, Pearson, A, McNichol, AP, Bauer, JE, Druffel, ERM. 1997. Variability in radiocarbon ages of individual organic compounds from marine sediments. Science 27:796–9.Google Scholar
Froelich, PN. 1980. Analysis of organic carbon in marine sediments. Limnology and Oceanography 25:564–72.Google Scholar
Holland, L. 1964. The properties of glass surfaces. New York: John Wiley & Sons Inc.Google Scholar
Hurd, DC. 1983. Physical and chemical properties of siliceous skeletons. In: Aston, SR, editor. Silicon geochemistry and biogeochemistry. New York: Academic Press.Google Scholar
Jones, GA, Gagnon, AR. 1994. Radiocarbon chronology of Black Sea Sediments. Deep-Sea Research I 41: 531–57.Google Scholar
Kenny, MB, Sing, KSW. 1994. Adsorptive properties of porous silica. In: Bergna, HE, editor. The colloid chemistry of silica. Advances in Chemistry Series 234. Washington DC: American Chemical Society. p 505–15.Google Scholar
Kiselev, AV, Kuznetsov, BV, Lanin, SN. 1979. Adsorption of triethylamine and water vapor and the modification of silica surface by gaseous trimethylchlorosilane. Journal of Colloid and Interface Science 69:148–56.CrossRefGoogle Scholar
Larter, SR, Horsfield, B. 1993. Determination of structural components of kerogens by the use of analytical pyrolysis methods. In: Engel, MH, Macko, SA, editors. Organic geochemistry: principles and applications. New York: Plenum Press. p 271–87.Google Scholar
Lyle, M, Zahn, R, Prahl, F, Dymond, J, Collier, R, Pisias, N, Suess, E. 1992. Paleoproductivity and carbon burial across the California Current: the multitracers transect, 42$dGN. Paleoceanography 7:251–72.Google Scholar
McNichol, AP, Gagnon, AR, Jones, GA, Osborne, EA. 1992. Illumination of a black box: analysis of gas composition during graphite target preparation. Radiocarbon 34(3):321–9.Google Scholar
McNichol, AP, Osborne, EA, Gagnon, AR, Fry, B, Jones, GA. 1994. TIC, TOC, DIC, DOC, PIC, POC – unique aspects in the preparation of oceanographic samples for 14C-AMS. Nuclear Instruments and Methods in Physics Research B92:162–5.Google Scholar
Mortlock, RA, Charles, CD, Froelich, PN, Zibello, MA, Saltzman, J, Hays, JD Burckle, LH. 1991. Evidence for lower productivity in the Antarctic Ocean during the last glaciation. Nature 351:220–2.Google Scholar
Pearson, A, McNichol, AP, Schneider, RJ, von Reden, KF, Zheng, Y. 1998. Microscale AMS 14C measurement at NOSAMS. Radiocarbon 40(1):61–75.CrossRefGoogle Scholar
Shemesh, A, Mortlock, RA, Smith, RJ, Froelich, PN. 1988. Determination of Ge/Si in marine siliceous microfossils; separation, cleaning and dissolution of diatoms and Radiolaria. Marine Chemistry 25:305–23.Google Scholar
Shemesh, A, Macko, SA, Charles, CD, Rau, GH. 1993. Isotopic evidence for reduced productivity in the glacial Southern Ocean. Science 262:407–10.Google Scholar
Singer, AJ, Shemesh, A. 1995. Climatically linked carbon isotope variation during the past 430,000 years in Southern Ocean sediments. Paleoceanography 10: 171–7.CrossRefGoogle Scholar
Sirevag, R, Buchanan, BB, Berry, JA, Troughton, JH. 1977. Mechanism of CO2 fixation in bacterial photosynthesis studied by carbon isotope fractionation technique. Arch. Microbiology 112:35–8.Google Scholar
Steiger, T. 1997. Miocene radiolarian biostratigraphy of the décollement zone (Northern Barbados Ridge). In: Shipley, TH, Ogawa, Y, Blum, P, Bahr, JM, editors. Proceedings of the Ocean Drilling Program, Scientific Results 156:33–48.Google Scholar
Stevenson, FJ. 1982. Humus chemistry: genesis, composition, reactions. New York: Wiley Inc. p 244–63.Google Scholar
Swift, DM, Wheeler, AP. 1992. Evidence for an organic matrix from diatom biosilica. Journal of Phycol. 28: 202–9.Google Scholar
Tyson, RV. 1995. Sedimentary organic matter. London: Chapman & Hall. p 249–59.Google Scholar
Unger, KK. 1994. Surface structure of amorphous and crystalline porous silicas. In: Bergna, HE, editor. The colloid chemistry of silica. Advances in Chemistry Series 234. Washington DC: American Chemical Society. p 165–81.Google Scholar
Verardo, D, Froelich, PN, McIntyre, A. 1990. Determination of organic carbon and nitrogen in marine sediments using the Carlo Erba NA-1500 Analyzer. Deep-Sea Research 37:157–65.Google Scholar
Vogel, JS, Nelson, DE, Southon, JR. 1987. 14C background levels in an accelerator mass spectrometry system. Radiocarbon 29(3):323–33.Google Scholar
Werth, CJ, Reinhard, M. 1997. Effects of temperature on trichloroethylene desorption from silica gel and natural sediments. 2. Kinetics. Environment Science Technology 31:697–703.Google Scholar
Xu, Y, Wise, JSW. 1997. Calcareous nannofossils from Leg 156, Northern Barbados Ridge Complex. In: Shipley, TH, Ogawa, Y, Blum, P, Bahr, JM, editors. Proceedings of the Ocean Drilling Program, Scientific Results 156:49–56.Google Scholar
Zheng, Y. 1999. The marine geochemistry of germanium, molybdenum and uranium: the sinks [PhD thesis]. New York: Columbia University. 336 p.Google Scholar