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

Nobuhiko Nakano, Yasuhito Osanai, Masaaki Owada, Yasutaka Hayasaka, Tran Ngoc Nam

研究成果: ジャーナルへの寄稿記事

16 引用 (Scopus)

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 1.1-1.2GPa and peak temperature conditions of 730-750°C at 0.7-0.8GPa. 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.

元の言語英語
ページ(範囲)126-143
ページ数18
ジャーナルIsland Arc
18
発行部数1
DOI
出版物ステータス出版済み - 5 11 2009

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continental collision
kyanite
metamorphism
Triassic
ultrahigh temperature metamorphism
garnet
tectonics
staurolite
gneiss
temperature
symplectite
metapelite
cordierite
sillimanite
monazite
paragenesis
electron probe analysis
spinel
collision
quartz

All Science Journal Classification (ASJC) codes

  • Geology

これを引用

Permo-Triassic Barrovian-type metamorphism in the ultrahigh-temperature Kontum Massif, central Vietnam : Constraints on continental collision tectonics in Southeast Asia. / Nakano, Nobuhiko; Osanai, Yasuhito; Owada, Masaaki; Hayasaka, Yasutaka; Nam, Tran Ngoc.

:: Island Arc, 巻 18, 番号 1, 11.05.2009, p. 126-143.

研究成果: ジャーナルへの寄稿記事

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abstract = "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 1.1-1.2GPa and peak temperature conditions of 730-750°C at 0.7-0.8GPa. 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.",
author = "Nobuhiko Nakano and Yasuhito Osanai and Masaaki Owada and Yasutaka Hayasaka and Nam, {Tran Ngoc}",
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N2 - 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 1.1-1.2GPa and peak temperature conditions of 730-750°C at 0.7-0.8GPa. 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.

AB - 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 1.1-1.2GPa and peak temperature conditions of 730-750°C at 0.7-0.8GPa. 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.

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