1966•The Journal of the Japanese Association of Mineralogists Petrologists and Economic GeologistsOpen access

Mg-Fe+2 DISTRIBUTION BETWEEN COEXISTING HORNBLENDE AND CA-RICH PYROXENE

Hitoshi Onuki

Abstract

Some theoretical considerations made on the distribution coefficient. Mg-Fe+2 distribution in coexisting hornblende and Ca-rich pyroxene from many kinds of rocks including igneous and metamorphic rocks are examined. The distribution coefficient of Mg-Fe+2 between these two minerals varies with temperatures at which they were formed, and is useful as a geothermometer. An approximate variation of the distribution coefficient with temperature is proposed.

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Key concepts: Pyroxene, Hornblende, Igneous rock, Metamorphic rock, Geology, Mineralogy, Diopside, Geochemistry