Orthopyroxene-bearing rocks from the Tenmondai and Naga-iwa Rocks in the Prince Olav Coast, East Antarctica: First appearance of orthopyroxene in progressive metamorphic sequence

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Orthopyroxene first appears in the Tenmondai and Naga-iwa Rocks in the progressive metamorphic sequence of the kyanite-sillimanite type from northeast to southwest along the Prince Olav and Soya Coasts, East Antarctica. Field occurrence and detailed petrography of three orthopyroxene-bearing rocks from the bedrock exposures are presented in this paper. The mineral compositions as well as mineral textures suggest that the rocks are close to chemical equilibrium, that orthopyroxene was first produced in such manner (order) as is predicted experimentally and theoretically, and that the chemical compositions of the calcic amphiboles coexisting with orthopyroxene can be indicators of metamorphic grade.
国立極地研究所の論文