Sapphirine plus quartz assemblage from Ganguvarpatti: diagnostic evidence for ultrahigh-temperature metamorphism in central Madurai Block, southern India

• KONDOU Nozomi

  College of Natural Sciences, University of Tsukuba

• TSUNOGAE Toshiaki

  Graduate School of Life and Environmental Sciences (Earth Evolution Sciences), University of Tsukuba Department of Geology, University of Johannesburg

• SANTOSH M.

  Department of Natural Environmental Science, Faculty of Science, Kochi University

• SHIMIZU Hisako

  Graduate School of Life and Environmental Sciences (Earth Evolution Sciences), University of Tsukuba

書誌事項

タイトル別名

• Sapphirine + quartz assemblage from Ganguvarpatti: diagnostic evidence for ultrahigh-temperature metamorphism in central Madurai Block, southern India

抄録

We report the finding of sapphirine + quartz equilibrium assemblage in an orthopyroxene-sapphirine granulite from Ganguvarpatti in southern India, providing diagnostic evidence for ultrahigh-temperature (UHT) metamorphism in the central Madurai Block. The sapphirine-quartz-bearing rock is composed of coarse-grained (∼ 3 mm) porphyroblastic orthopyroxene and sapphirine which were probably stable phases during the peak UHT condition within the stability field of sapphirine + quartz. The rock also contains corona textures such as orthopyroxene + sapphirine + cordierite and orthopyroxene + cordierite symplectites formed by post-peak decompression. The porphyroblastic sapphirine contains rare inclusions of quartz. The equilibrium sapphirine + quartz reported here is regarded as a diagnostic indicator of peak metamorphism at T > 1000 °C and confirms the formation and exhumation of ultra-hot orogens during the accretionary history of the Madurai Block related to the Pacific-type orogeny and final collisional assembly of the Gondwana supercontinent in the Late Neoproterozoic-Cambrian.

収録刊行物

• Journal of Mineralogical and Petrological Sciences

  Journal of Mineralogical and Petrological Sciences 104 (5), 285-289, 2009

  一般社団法人　日本鉱物科学会

キーワード

• Sapphirine + quartz
• Ultrahigh-temperature metamorphism
• Ganguvarpatti
• Madurai Block
• Southern India
• Gondwana supercontinent

詳細情報

• CRID: 1390282681521803776
• NII論文ID: 10025445015
• NII書誌ID: AA11460926
• DOI: 10.2465/jmps.090607
• ISSN: 13493825
• ISSN: 13456296
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可