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Marine Reservoir Correction for the Cocos (Keeling) Islands, Indian Ocean

Published online by Cambridge University Press:  18 July 2016

Quan Hua ,
Colin D Woodroffe ,
Mike Barbetti ,
Scott G Smithers ,
Ugo Zoppi  and
David Fink
Quan Hua*
Affiliation:
Australian Nuclear Science and Technology Organisation (ANSTO), PMB 1, Menai, New South Wales 2234, Australia
Colin D Woodroffe
Affiliation:
School of Geosciences, University of Wollongong, Wollongong, New South Wales 2522, Australia
Mike Barbetti
Affiliation:
NWG Macintosh Centre for Quaternary Dating, Madsen Building F09, University of Sydney, New South Wales 2006, Australia
Scott G Smithers
Affiliation:
School of Tropical Environment Studies and Geography, James Cook University, Townsville, Queensland 4811, Australia
Ugo Zoppi
Affiliation:
Australian Nuclear Science and Technology Organisation (ANSTO), PMB 1, Menai, New South Wales 2234, Australia
David Fink
Affiliation:
Australian Nuclear Science and Technology Organisation (ANSTO), PMB 1, Menai, New South Wales 2234, Australia
*
Corresponding author. Email: qhx@ansto.gov.au.
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Abstract

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Known-age corals from the Cocos (Keeling) Islands, Indian Ocean, have been analyzed by accelerator mass spectrometry (AMS) for radiocarbon to determine marine reservoir age corrections. The ΔR value for the Cocos (Keeling) Islands is 66 ± 12 yr based on the analyses undertaken for this study. When our AMS and previously published dates for Cocos are averaged, they yield a ΔR of 64 ± 15 yr. This is a significant revision of an earlier estimate of the ΔR value for the Cocos (Keeling) Islands of 186 ± 66 yr (Toggweiler et al. 1991). The (revised) lower ΔR for the Cocos (Keeling) Islands is consistent with GEOSECS 14C data for the Indian Ocean, and previously published bomb 14C data for the Red Sea, Gulf of Aden, and Cocos Islands. The revised ΔR is also close to values for the eastern Indian Ocean and adjacent seas. These suggest surface waters that reach the Cocos Islands might be partly derived from the far western Pacific, via the Indonesian throughflow, and might not be influenced by the southeast flow from the Arabian Sea.

Type
Part II
Information
Radiocarbon , Volume 46 , Issue 2: Proceedings of the 18th International Radiocarbon Conference (Part 2 of 2), Conference Editors: Nancy Beavan Athfield, Rodger J Sparks , 2004 , pp. 603 - 610
Copyright
Copyright © The Arizona Board of Regents on behalf of the University of Arizona 

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