Eclogites and high pressure metamorphic rocks in the Lake Zone, Mongolia

概要

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The first occurrence of eclogites in Mongolia has been described from the Chandman district in the Lake Zone, western Mongolia (Hanzl and Aichler, 2006; Takasu et al., 2008). The Alag Khadny metamorphic complex consisting of metamorphic rocks and ultramafic bodies is exposed for about 10 km across and 4 km wide in the Lake Zone. Several lenticular-shaped bodies of eclogites and amphibolites (max. 2 km x 0.8 km) occur in the matrix of orthogneisses and minor pelitic gneisses. Eclogite consist mainly of garnet, sodic-calcic, and calcic amphibole, and epidote. Omphacite (Jd components are up to 40%), white mica, rutile, titanite, quartz, and albite as minor minerals.The eclogites experienced four metamorphic events. HT-amphibolite facies of precursur stage (M1); HP metamorphism of the eclogite facies (M2); HP-epidote-amphibolite facies (M3); and HP-amphibolite facies metamorphism (M4).
日本鉱物科学会の論文