炭酸カルシウムのCa,Mg安定同位体分別

DOI Web Site 参考文献60件
  • 吉村 寿紘
    東京大学大学院新領域創成科学研究科: 東京大学大気海洋研究所: 日本学術振興会特別研究員
  • 谷水 雅治
    独立行政法人海洋研究開発機構高知コア研究所

書誌事項

タイトル別名
  • Ca and Mg stable isotope fractionation in calcium carbonate
  • 地球化学の最前線 炭酸カルシウムのCa,Mg安定同位体分別
  • チキュウ カガク ノ サイゼンセン タンサン カルシウム ノ Ca,Mg アンテイ ドウイタイ フンベツ

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抄録

Variations in Mg and Ca stable isotope ratios provide constraints on a variety of geological and biogeochemical processes. Recent improvements in thermal and plasma mass spectrometry have allowed the precise measurement of small differences in Ca and Mg isotopic compositions in CaCO3, and consequently, their isotopic fractionation has been considered to have complementary information regarding marine temperature reconstructed from conventional proxies. These new tools can provide an opportunity to refine a biological control during biomineralization processes, which is critical for improvement of biological proxies. Studies on isotopic fractionation of marine CaCO3 have been also performed to investigate past changes in marine Ca and Mg budgets that are controlled, for example, by continental weathering, mid-ocean ridge spreading rate, carbonate sedimentation, and dolomitization. Therefore, marine Ca and Mg isotope ratios play important roles to understand global Ca and Mg cycles and it is suggested that these cycles are likely related to climate change. This article reviews present knowledge and the potential of Ca and Mg isotope ratios in biogenic and inorganic CaCO3 for reconstructing seawater temperature and isotope ratios in the oceans over geologic past.

収録刊行物

  • 地球化学

    地球化学 46 (1), 33-49, 2012

    一般社団法人日本地球化学会

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