Sr thermometer for Porites corals. Little need to measure Ca?

• Sun Min

  Department of Earth Sciences, University of Hong Kong

• Chiu Chin-Hsin

  Institute of Earth Sciences, Academia Sinica

• Shen Chuan-Chou

  School of Oceanography, University of Washington

• Lee Typhoon

  Institute of Earth Sciences, Academia Sinica

抄録

Cubic sub-samples of 1 mm³ (about 0.5 mg) were obtained from a Porites coral slice collected from Xisha Island, South China Sea and analysed for Sr and Ca concentrations by ID-TIMS after precise weighing. Ca contents in the coral are quite uniform (mean = 38.16 wt%, 2σ = 0.11 wt%). The variation corresponds to ±0.4°C, about the level of uncertainty of the Sr/Ca-SST calibration. Sr concentrations and Sr/Ca ratios covary linearly, and the line can be defined by the equation Sr/Ca × 10³ = 0.111Sr - 0.5061 (correlation coefficient r = 0.9955), where Sr is in μmol/gm. Consequently, our results demonstrate that the previously established coral Sr/Ca thermometer, Sr/Ca × 10³ = A + B × T, can be simplified as a Sr thermometer, 0.111Sr - 0.5061 = A + B × T, where Sr is in μmol/gm. Therefore, measurement of Ca in corals could be unnecessary. If different levels of impurity exist in different corals, a few Ca measurements in each coral may be needed, but definitely there is no need to measure every sub-sample.

収録刊行物

• ＧＥＯＣＨＥＭＩＣＡＬ　ＪＯＵＲＮＡＬ

  ＧＥＯＣＨＥＭＩＣＡＬ　ＪＯＵＲＮＡＬ 33 (5), 351-354, 1999

  一般社団法人日本地球化学会

キーワード

• Geochemistry and Petrology
• Geophysics

詳細情報

• CRID: 1390282679527527296
• NII論文ID: 10008804389
• NII書誌ID: AA00654975
• DOI: 10.2343/geochemj.33.351
• ISSN: 18805973
• ISSN: 00167002
• NDL書誌ID: 4871818
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4871818
• Web Site: http://www.jstage.jst.go.jp/article/geochemj1966/33/5/33_5_351/_pdf
• 本文言語コード: en
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