溶液中の硫酸-硫化水素,硫酸-水,リン酸-水間の同位体交換平衡定数と交換速度の実験的研究 : 私的レビュー(1999年度日本地球化学会柴田賞受賞記念論文)

概要

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The sulfur isotope ratios of sulfate and sulfide mineral pairs in hydrothermal ore deposits have been often used for the estimation of the formation temperature of the mineral pairs. The oxygen isotopic ratios of sulfate and phosphate have also been useful means to assess the formation temperatures of various sulfate- and phosphate-deposits in hydrothermal to marine low temperature environments. In these applications, however, one must have the adequate knowledge on the following three parameters; 1) the temperature dependence of the equilibrium fractionation factors of sulfur or oxygen isotopes between coexisting phases in question, 2) the exchange rate of isotopes between the coexisting phases under given conditions such as temperature and pH, and 3) the residence time of the pairs in the given systems. I and my colleagues have been engaged in experimental determinations of exchange rates and equilibrium fractionation factors of sulfur isotopes in sulfate/sulfide system and of oxygen isotopes in sulfate/water and phosphate/water systems. In this article, I will review and summarize the results of these works with special emphases on their application to hydrothermal sulfate/sulfide system and to sulfate and phosphate in marine environments. Recent works on phosphate/water oxygen isotope exchange will also be mentioned.
日本地球化学会の論文
2000-12-18