Petrology, geochemistry, and origin of metamorphosed mafic rocks of the Trans Vietnam Orogenic Belt, Southeast Asia

  • YONEMURA Kazuhiro
    Division of Polar Region Environment, Graduate school of Social and Cultural Studies, Kyushu University
  • OSANAI Yasuhito
    Division of Earth Sciences, Faculty of Social and Cultural Studies, Kyushu University
  • NAKANO Nobuhiko
    Division of Earth Sciences, Faculty of Social and Cultural Studies, Kyushu University
  • OWADA Masaaki
    Department of Earth Sciences, Yamaguchi University
  • BABA Sotaro
    Department of Natural Environment, University of the Ryukyus

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抄録

The Trans Vietnam Orogenic Belt (TVOB) of Southeast Asia is thought to have formed by a continent-continent collision between the South China and Indochina cratons in Permian-Triassic times. Here we focus on the nature and origin of metamorphosed mafic rocks that are widely distributed throughout the TVOB, including rocks from the Cangshan Mountains (northern TVOB), the Red River Shear Zone and Song Ma Suture Zone (central TVOB), and the Kontum Massif (southern TVOB). Amphibolite facies metamorphosed mafic rocks are widely distributed throughout all of these areas, while granulite facies and eclogite facies metamorphosed mafic rocks occur only in the Kontum Massif and Song Ma Suture Zone, respectively. Major and trace element compositions of these TVOB metamorphosed mafic rocks indicate an overall tholeiitic affinity, but suggest a wide array of tectonic settings for the precursor mafic magmas, including volcanic-arc basalt (VAB), mid-ocean ridge basalt (MORB), and within-plate basalt (WPB). In addition, Fe-rich gabbro-derived mafic metamorphic rocks occur in the southern part of the TVOB (in the Kontum Massif). On the basis of the distributions of each type of mafic metamorphic rocks and their metamorphic grades, there were arc and oceanic crust between the South China Craton and the Indochina Craton.

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詳細情報

  • CRID
    1390001206545481984
  • NII論文ID
    10031158586
  • NII書誌ID
    AA11460926
  • DOI
    10.2465/jmps.120813
  • COI
    1:CAS:528:DC%2BC3sXhtF2isrjI
  • ISSN
    13493825
    13456296
  • 本文言語コード
    en
  • データソース種別
    • JaLC
    • Crossref
    • CiNii Articles
    • KAKEN
  • 抄録ライセンスフラグ
    使用不可

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