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Comparison of 14C and U-Th Ages in Corals from IODP #310 Cores Offshore Tahiti

Published online by Cambridge University Press:  09 February 2016

Nicolas Durand*
Affiliation:
CEREGE, Aix-Marseille Univ., CNRS, IRD, Collège de France, Technopole de l'Arbois, BP 80, 13545 Aix-en-Provence Cedex 4, France
Pierre Deschamps
Affiliation:
CEREGE, Aix-Marseille Univ., CNRS, IRD, Collège de France, Technopole de l'Arbois, BP 80, 13545 Aix-en-Provence Cedex 4, France
Edouard Bard
Affiliation:
CEREGE, Aix-Marseille Univ., CNRS, IRD, Collège de France, Technopole de l'Arbois, BP 80, 13545 Aix-en-Provence Cedex 4, France
Bruno Hamelin
Affiliation:
CEREGE, Aix-Marseille Univ., CNRS, IRD, Collège de France, Technopole de l'Arbois, BP 80, 13545 Aix-en-Provence Cedex 4, France
Gilbert Camoin
Affiliation:
CEREGE, Aix-Marseille Univ., CNRS, IRD, Collège de France, Technopole de l'Arbois, BP 80, 13545 Aix-en-Provence Cedex 4, France
Alexander L Thomas
Affiliation:
Department of Earth Sciences, South Parks Road, Oxford OX1 3 AN, United Kingdom
Gideon M Henderson
Affiliation:
Department of Earth Sciences, South Parks Road, Oxford OX1 3 AN, United Kingdom
Yusuke Yokoyama
Affiliation:
Atmosphere and Ocean Research Institute and Department of Earth and Planetary Science University of Tokyo, 5-1-5 Kashiwanoha, Kashiwashi, Chiba 277-8564, Japan Institute of Biogeosciences, JAMSTEC, Yokosuka, Japan
Hiroyuki Matsuzaki
Affiliation:
Department of Nuclear Engineering and Management, University of Tokyo, 2-11-16 Yayoi, Tokyo 113-0032, Japan
*
Corresponding author: [email protected].
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Abstract

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Shallow-water tropical corals can be used to calibrate the radiocarbon timescale. In this paper, we present a new data set based on the comparison between 14C ages and U-Th ages measured in fossil corals collected offshore the island of Tahiti during the Integrated Oceanic Drilling Program (IODP) Expedition 310. After applying strict mineralogical and geochemical screening criteria, the Tahiti record provides new data for 2 distinct time windows: 7 data for the interval between 29 and 37 cal kyr BP and 58 for the last deglaciation period, notably a higher resolution for the 14–16 cal kyr BP time interval. There are 3 main outcomes of this study. First, it extends the previous Tahiti record beyond 13.9 cal kyr BP, the oldest U-Th age obtained on cores drilled onshore in the modern Tahiti barrier reef. Second, it strengthens the data set of the 14–15 cal kyr BP period, allowing for better documentation of the 14C age plateau in this time range. This age plateau corresponds to a drop of the atmospheric 14C synchronous with an abrupt period of sea-level rise (Melt Water Pulse 1 A, MWP-1 A). The Tahiti 14C record documents complex changes in the global carbon cycle due to variations in the exchange rates between its different reservoirs. Third, during the Heinrich event 1, the Tahiti record disagrees with the Cariaco record, but is in broad agreement with other marine and continental data.

Type
Research Article
Copyright
Copyright © 2013 by the Arizona Board of Regents on behalf of the University of Arizona 

Footnotes

2

Present address: Laboratoire de Mesure du Carbone 14 UMS 2572, CEA-Saclay, Bât. 450, 91191 Gif-sur-Yvette Cedex, France.

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