Permo–Triassic Barrovian-type metamorphism in the ultrahigh-temperature Kontum Massif, central Vietnam: Constraints on continental collision tectonics in Southeast Asia

• NAKANO NOBUHIKO

  Division of Evolution of Earth Environments, Faculty of Social and Cultural Studies, Kyushu University

• OSANAI YASUHITO

  Division of Evolution of Earth Environments, Faculty of Social and Cultural Studies, Kyushu University

• OWADA MASAAKI

  Division of Earth Sciences, Graduate School of Science and Technology, Yamaguchi University

• HAYASAKA YASUTAKA

  Department of Earth and Planetary Systems Science, Hiroshima University

• NAM TRAN NGOC

  Department of Geosciences, Hue University

書誌事項

タイトル別名

• Permo-Triassic Barrovian-type metamorphism in the ultrahigh-temperature Kontum Massif, central Vietnam : Constraints on continental collision tectonics in Southeast Asia

抄録

The Kontum Massif in central Vietnam is composed of various metamorphic complexes including a high-temperature southern part (Kannak and Ngoc Linh complexes) and a low- to medium-temperature northern part (Kham Duc complex). The Kham Duc complex exhibits Barrovian-type medium-pressure metamorphism evidenced by kyanite- and/or staurolite-bearing metapelites. The garnet–gedrite–kyanite gneiss, which is the focus of the present study, preserves several mineral parageneses formed during a prograde and retrograde metamorphic history: staurolite + quartz in gedrite, garnet + gedrite + kyanite in the matrix, and spinel + cordierite symplectite between gedrite and sillimanite. The calculated semiquantitative petrogenetic grid reveals peak pressure conditions of 620–650°C at 1.1–1.2 GPa and peak temperature conditions of 730–750°C at 0.7–0.8 GPa. The monazite U–Th–Pb electron microprobe ages of the garnet–gedrite–kyanite gneiss and associated gneisses yield 246 ± 3 Ma for the Kham Duc complex, which is similar to the age of the high- to ultrahigh-temperature metamorphism in the adjacent Kannak and Ngoc Linh complexes of the southern Kontum Massif. The present results indicate that both the Barrovian-type and ultrahigh-temperature metamorphism occurred simultaneously in the Kontum Massif during an event strongly related to Permo–Triassic microcontinental collision tectonics in Asia.

収録刊行物

• The Island arc

  The Island arc 18 (1), 126-143, 2009-03-01

  Blackwell Scientific

キーワード

• Barrovian-type metamorphism
• continental collision
• garnet-gedrite-kyanite gneiss
• Kham Duc complex
• Kontum Massif
• Permo-Triassic age
• Vietnam

詳細情報

• CRID: 1574231875747299840
• NII論文ID: 10026541059
• NII書誌ID: AA10848628
• ISSN: 10384871
• Web Site: http://hdl.handle.net/2324/20266
• 本文言語コード: en
• データソース種別:
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