Dehydration melting, fluid buffering and decompressional <i>P–T</i> path in a granulite complex from the Eastern Ghats, India

DOI Web Site Web Site 被引用文献2件

書誌事項

公開日
1992-11
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1111/j.1525-1314.1992.tb00122.x
公開者
Wiley

この論文をさがす

説明

<jats:p>A suite of metapelites, charnockites, calc‐silicate rocks, quartzo‐feldspathic gneisses and mafic granulites is exposed at Garbham, a part of the Eastern Ghats granulite belt of India. Reaction textures and mineral compositional data have been used to determine the <jats:italic>P–T–X</jats:italic> evolutionary history of the granulites. In metapelites and charnockites, dehydration melting reactions involving biotite produced quartzofeldspathic segregations during peak metamorphism. However, migration of melt from the site of generation was limited. Subsequent to peak metamorphism at <jats:italic>c</jats:italic>. 860° C and 8 kbar, the complex evolved through nearly isothermal decompression to 530–650° C and 4–5 kbar. During this phase, coronal garnet grew in the calc‐silicates, while garnet in the presence of quartz broke down in charnockite and mafic granulite. Fluid activities during metamorphism were internally buffered in different lithologies in the presence of a melt phase. The <jats:italic>P–T</jats:italic> path of the granulites at Garbham contrasts sharply with the other parts of the Eastern Ghats granulite belt where the rocks show dominantly near‐isobaric cooling subsequent to peak metamorphism.</jats:p>

収録刊行物

被引用文献 (2)*注記

もっと見る

詳細情報 詳細情報について

問題の指摘

ページトップへ