Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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The Gariadih Rapakivi Granite of the Bihar Mica Belt Hazaribagh District, Bihar


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1 Department of Geology, Presidency College, Calcutta, India
     

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The rapakivi granite forms a large dyke-like body within a group of amphibolite facies Precambrian metamorphites and gneissose granite. The essential mineral constituents are orthoclase, microcline, plagioclase, quartz, biotite, hornblende (ferrohastingsite) and accessory minerals apatite and xenotime. Emplacement of a fresh surge of K-rich magma towards the closing stage of crystallisation of the gneissose granite body gave rise to the rapakivi granite.
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  • The Gariadih Rapakivi Granite of the Bihar Mica Belt Hazaribagh District, Bihar

Abstract Views: 194  |  PDF Views: 2

Authors

Udaybhanu Bhattacharya
Department of Geology, Presidency College, Calcutta, India

Abstract


The rapakivi granite forms a large dyke-like body within a group of amphibolite facies Precambrian metamorphites and gneissose granite. The essential mineral constituents are orthoclase, microcline, plagioclase, quartz, biotite, hornblende (ferrohastingsite) and accessory minerals apatite and xenotime. Emplacement of a fresh surge of K-rich magma towards the closing stage of crystallisation of the gneissose granite body gave rise to the rapakivi granite.