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 |
巻 | 45 |
号 | 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