Application of compound-specific radiocarbon dating to Antarctic margin sediments

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  • Ohkouchi Naohiko
    Institute of Biogeosciences, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Department of Environmental Chemical Engineering, Tokyo Institute of Technology Department of Earth and Planetary Science, The University of Tokyo

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  • 化合物レベル放射性炭素年代法の原理と南極縁辺海堆積物への応用
  • カゴウブツ レベル ホウシャセイ タンソ ネンダイホウ ノ ゲンリ ト ナンキョク エンペンカイ タイセキブツ エ ノ オウヨウ

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Historical/geological variability of the Antarctic Ice Sheet should be recorded in sediments from the Antarctic margin. However, it has been hampered by a lack of chronological information on the sediments, because they are subjected to serious “contamination” of relict organic matter from Antarctica. To resolve this problem, we determined the radiocarbon ages of solvent-extractable, short-chain (C14, C16, and C18) fatty acids isolated from surface sediments of the Ross Sea, Antarctica. The results indicated that they are consistent with the reservoir ages of modern dissolved inorganic carbon of the Ross Sea. Furthermore, the radiocarbon ages of these fatty acids at five down-core intervals progressively increase with the core depth. These results clearly show the utility of compound-specific radiocarbon dating for developing sediment chronologies in Antarctic margin sediments. Here we review the recent application of compound-specific radiocarbon dating technique for resolving the problems in relating chronologies of Antarctic margin sediments.

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