Variation and evolution of vietnamese metamorphic rocks

研究成果: ジャーナルへの寄稿学術誌査読

抄録

Trans Vietnam Orogenic Belt distributed in north to central Vietnam includes various types of metamorphic rocks. Most metamorphic rocks show the Permian-Triassic ages and are characterized by decompressional evolution with various metamorphic thermal gradients (8- 25 °C/km). In contrast, some metamorphic rocks having the Ordovician-Silurian age show isobaric heating prograde stage at low-pressure condition (25-30 °C/km). Granitic rocks also show the Permian-Triassic or Ordovician-Silurian ages. The older granitoids have volcanic arc chemical signature, some of which were metamorphosed at the Permian-Triassic. These results suggest that island arc tectonic setting at the Ordovician-Silurian, where arc magmatism heated the arc crust and caused the low-pressure (with isobaric heating) metamorphism at this period. The Permian-Triassic metamorphic rocks and granitoids were formed by subsequent continental collision and subduction of the Indochina craton together with the past Ordovician-Silurian island arc beneath the South China craton.

本文言語英語
ページ(範囲)26-32
ページ数7
ジャーナルJapanese Magazine of Mineralogical and Petrological Sciences
45
1
DOI
出版ステータス出版済み - 2016

!!!All Science Journal Classification (ASJC) codes

  • 地球化学および岩石学
  • 経済地質学

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