Formation of corundum in direct contact with quartz and biotite in clockwise P–T trajectory from the Sør Rondane Mountains, East Antarctica

Tomokazu Hokada, Tatsuro Adachi, Yasuhito Osanai, Nobuhiko Nakano, Sotaro Baba, Tsuyoshi Toyoshima

研究成果: ジャーナルへの寄稿学術誌査読

3 被引用数 (Scopus)

抄録

We have found corundum in direct contact with quartz and biotite and as inclusions in garnet in the pelitic gneisses of northern Austkampane in the Northeastern (NE) Terrane of the Sør Rondane Mountains (SRM), East Antarctica. Our samples, which include corundum–bearing gneisses, show petrographic features such as staurolite inclusions in garnet, compositional zoning of orthoamphibole with Al decreasing toward the rims, and late–stage cordierite formation, and these features are characteristic of a clockwise P–T trajectory. The observations are consistent with the proposed regional clockwise P–T evolution of the NE Terrane in the SRM. The corundum and other inclusions observed in the garnet porphyroblasts are interpreted to have formed owing to either staurolite breakdown or metastable crystallization relative to kyanite prior to the peak metamorphism. The close association of biotite and quartz surrounding corundum inclusions suggests fluid– or melt–related processes.

本文言語英語
論文番号8
ジャーナルJournal of Mineralogical and Petrological Sciences
117
1
DOI
出版ステータス出版済み - 2022

!!!All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 地質学

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