第四系浅海性炭酸塩堆積物における酸素・炭素同位体比を用いた古海洋研究の可能性(<特集>炭酸塩の地球化学)

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概要

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• The oxygen and carbon isotopic composition of shallow-water carbonates and their fossil components can be important tools for understanding Quaternary paleoceanographic conditions of marginal seas, including coral reef regions. However, recent paleoceanographic studies using isotopes have been based on pelagic or hemipelagic sediments because the original δ^<18>O and δ^<13>C values of shallow-water carbonates are normally altered by post-depositional diagenesis. This study shows that marginal- to open- ocean isotopic signals can be preserved in carefully cleaned low-Mg calcitic planktic foraminifers of shallow-water carbonates, even when the isotopic values of the carbonate host rock have been altered by meteoric fluids and subaerial exposure. Subsequently, the downcore δ^<18>O change of planktic foraminifers in Pleistocene shallow-water carbonates (the Ryukyu Group) can be used for the oxygen isotope stratigraphy. By com- parison, whole-rock measurements provide information that records the diagenetic signals, such as negative δ^<13>C spikes indicating horizons of subaerial exposure.

• 日本地球化学会の論文
• 2006-08-25

著者

• 坂井 三郎

  独立行政法人海洋研究開発機構・地球内部変動研究センター

• 坂井 三郎

  独立行政法人海洋研究開発機構

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