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Geology; August 2002; v. 30; no. 8; p. 731-734; DOI: 10.1130/0091-7613(2002)030<0731:RIBADO>2.0.CO;2
© 2002 Geological Society of America
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226Ra in barite: Absolute dating of Holocene Southern Ocean sediments and reconstruction of sea-surface reservoir ages

Pieter van Beek*,1, Jean-Louis Reyss*,1, Martine Paterne*,1, Rainer Gersonde2, Michiel Rutgers van der Loeff2 and Gerhard Kuhn2

1 Laboratoire des Sciences du Climat et de l'Environnement, Domaine du Centre National de la Recherche Scientifique, 91198 Gif-sur-Yvette, France
2 Alfred Wegener Institute for Polar and Marine Research, P.O. Box 120161, 27515 Bremerhaven, Germany

Absolute dating of marine sediments is necessary to achieve reliable correlations of paleoclimate records. The 226Ra decay in barite separated from a deep-sea core of the Southern Ocean was used to determine absolute ages for the Holocene Epoch. Comparison with 14C ages measured on planktic foraminifers provides the first past sea-surface reservoir ages in the Antarctic zone of the Southern Ocean. Throughout the middle to late Holocene, our results indicate a reservoir age of ca. 1100 yr, comparable to modern estimates. A significantly higher reservoir age (ca. 1900 yr) is obtained for the early Holocene, which suggests a major change in the Southern Ocean circulation at that time.

Key Words: paleoclimatology • Holocene • marine sediments • dating • radium • barite • radiocarbon • Southern Ocean




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