微量同位体比測定のための染色法による方解石-霰石の分離法

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  • Calcite-aragonite mineral separation using staining method for micro-scale isotopic analyses
  • ビリョウ ドウイタイヒ ソクテイ ノ タメ ノ センショクホウ ニ ヨル ホウカイセキ センセキ ノ ブンリホウ

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Mineral separation in carbonate group of minerals is a difficult task, and often resolved by staining technique. Feigl's solution and Meigen's solution are commonly used for distinguishing aragonite from the carbonate, the former stains black and the latter stains purple on the aragonite surface, while calcite and other carbonate species are changeless during staining treatment with each solution. Hence, we report a refined staining technique to separate aragonite from calcite using Meigen's solution. This method has advantage in obtaining 100% pure mineral separation for high precision of micro scale isotope analyses. As an example, we analyzed calcite-aragonite pairs from carbonate chimneys and found interesting isotopic results. Especially, radiocarbon activity in coexisting calcite and aragonite is significantly different, and this result suggests the presence of entirely different fluid source for calcite and aragonite precipitation.

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