Sr/Ca-Ba/Ca systematics in Antarctic Ca-rich achondrites and their origins

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概要

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• The Ca, Sr and Ba contents of six Antarctic polymict eucrites (Y-74450,Y-75011,Y-75015,ALH-765,ALH-78040 and ALH-78132) and a unique Antarctic achondrite (ALH-77005) have been determined by ICP-OES. When the data are plotted in the Sr/Ca-Ba/Ca diagram which enables us to visualize igneous processes such as partial melting and crystal fractionation, the eucrites fall on a crystal fractionation line defined by a set of typical eucrites and the unique achondrite falls on a partial melting line through chondritic Sr/Ca and Ba/Ca ratios. The results suggest that the eucrites are a series of melts evolved from a primary magma by clinopyroxene and plagioclase fractionation, while the unique achondrite is a residual solid phase derived from a chondritic source material by a largescale partial melting.

• 国立極地研究所の論文

著者

• Onuma Naoki

  Institute Of Chemistry The University Of Tukuba

関連論文

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• Origin and Evolution of Condrules Based on Na/Al-Dispersion and -Convergence in Yamato-74 Ordinary Chondrites
• A Classification of Several Yamato-74 Chondrites
• Sr/Ca-Ba/Ca systematics in Antarctic Ca-rich achondrites and their origins
• Rapid Simultaneous 17 Elements Analysis of Some Yamato Meteorites by ICP-OES

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