Collision zone metamorphism in Vietnam and adjacent South-eastern Asia: Proposition for Trans Vietnam Orogenic Belt

Yasuhito Osanai, Nobuhiko Nakano, Masaaki Owada, Tran Ngoc Nam, Tomoharu Miyamoto, Nguyen Thi Mihn, Nguyen van Nam, Tran van Tri

研究成果: ジャーナルへの寄稿記事

33 引用 (Scopus)

抄録

Recent geological and petrological investigations of the metamorphic rocks from Vietnam revealed the following new evidences to understand the tectonic evolution of Southeast Asia; 1) findings of ultrahigh-T(∼ 1000 °C) pelitic granulites, high- to ultrahigh-P (∼ 40 kbar) mafic metamorphic rocks and high-P/medium-T gneisses from the Kontum Massif, 2) eclogite and high-P granulite from the Song Ma suture zone, and 3) ultrahigh-T aluminous granulite rrom the Red River zone. These lines or evidence are strongly indicative of the highest-metamorphic conditions in each metamorphic terrane. Estimated P-T conditions and reaction textures from these rocks delineate a characteristic clockwise pressure-temperature-time (P-T-t) path for each other. Based on the combination of P-T paths from these complexes, two-stages of metamorphic field gradient are identified. An earlier MO-stage of high-P/T gradient is recognized, based on the peak-P conditions from the Kontum Massif and Song Ma suture zone. A later M1-stage of low-P/T gradient is also identified by linking the peak metamorphic conditions from the Kontum Massif, the Song Ma suture zone and the Red River zone. The former metamorphic field gradient could represent an early continental collision event and the latter would indicate a peak metamorphic stage caused by very high-T magmatic intrusion (asthenosphere upwelling) as a heat source of ultrahigh-T metamorphism. A simultaneous collision metamorphism throughout Vietnam should have taken place during the continental collision between Indochina and South China cratons, which led to the formation of Trans Vietnam Orogertic Belt.

元の言語英語
ページ(範囲)226-241
ページ数16
ジャーナルJournal of Mineralogical and Petrological Sciences
103
発行部数4
DOI
出版物ステータス出版済み - 12 5 2008

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Vietnam
collision zone
suture zone
song
orogenic belt
metamorphism
continental collision
granulite
gradients
metamorphic rock
metamorphic rocks
collisions
rivers
P-T conditions
Southeast Asia
heat source
asthenosphere
eclogite
mafic rock
tectonic evolution

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geology

これを引用

Collision zone metamorphism in Vietnam and adjacent South-eastern Asia : Proposition for Trans Vietnam Orogenic Belt. / Osanai, Yasuhito; Nakano, Nobuhiko; Owada, Masaaki; Nam, Tran Ngoc; Miyamoto, Tomoharu; Mihn, Nguyen Thi; van Nam, Nguyen; van Tri, Tran.

:: Journal of Mineralogical and Petrological Sciences, 巻 103, 番号 4, 05.12.2008, p. 226-241.

研究成果: ジャーナルへの寄稿記事

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abstract = "Recent geological and petrological investigations of the metamorphic rocks from Vietnam revealed the following new evidences to understand the tectonic evolution of Southeast Asia; 1) findings of ultrahigh-T(∼ 1000 °C) pelitic granulites, high- to ultrahigh-P (∼ 40 kbar) mafic metamorphic rocks and high-P/medium-T gneisses from the Kontum Massif, 2) eclogite and high-P granulite from the Song Ma suture zone, and 3) ultrahigh-T aluminous granulite rrom the Red River zone. These lines or evidence are strongly indicative of the highest-metamorphic conditions in each metamorphic terrane. Estimated P-T conditions and reaction textures from these rocks delineate a characteristic clockwise pressure-temperature-time (P-T-t) path for each other. Based on the combination of P-T paths from these complexes, two-stages of metamorphic field gradient are identified. An earlier MO-stage of high-P/T gradient is recognized, based on the peak-P conditions from the Kontum Massif and Song Ma suture zone. A later M1-stage of low-P/T gradient is also identified by linking the peak metamorphic conditions from the Kontum Massif, the Song Ma suture zone and the Red River zone. The former metamorphic field gradient could represent an early continental collision event and the latter would indicate a peak metamorphic stage caused by very high-T magmatic intrusion (asthenosphere upwelling) as a heat source of ultrahigh-T metamorphism. A simultaneous collision metamorphism throughout Vietnam should have taken place during the continental collision between Indochina and South China cratons, which led to the formation of Trans Vietnam Orogertic Belt.",
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