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

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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 from the Red River zone. These lines of 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 M0-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 Orogenic Belt.

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-<i>T</i> (∼ 1000 °C) pelitic granulites, high- to ultrahigh-<i>P</i> (∼ 40 kbar) mafic metamorphic rocks and high-<i>P</i>/medium-<i>T</i> gneisses from the Kontum Massif, 2) eclogite and high-<i>P</i> granulite from the Song Ma suture zone, and 3) ultrahigh-<i>T</i> aluminous granulite from the Red River zone. These lines of evidence are strongly indicative of the highest- metamorphic conditions in each metamorphic terrane. Estimated <i>P-T</i> conditions and reaction textures from these rocks delineate a characteristic clockwise pressure-temperature-time (<i>P-T-t</i>) path for each other..<br>     Based on the combination of <i>P-T</i> paths from these complexes, two-stages of metamorphic field gradient are identified. An earlier M0-stage of high-<i>P/T</i> gradient is recognized, based on the peak-<i>P</i> conditions from the Kontum Massif and Song Ma suture zone. A later M1-stage of low-<i>P/T</i> 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-<i>T</i> magmatic intrusion (asthenosphere upwelling) as a heat source of ultrahigh-<i>T</i> 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 Orogenic Belt.

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  • Journal of mineralogical and petrological sciences  

    Journal of mineralogical and petrological sciences 103(4), 226-241, 2008-08-01 

    Mineralogical Society of Japan

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各種コード

  • NII論文ID(NAID)
    10021369806
  • NII書誌ID(NCID)
    AA11460926
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13456296
  • データ提供元
    CJP書誌  CJP引用  IR  J-STAGE 
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