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

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Petrochemistry of the Chengannoor Granite, Alleppey District, Kerala


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1 Centre for Earth Science Studies, P. B. No. 2235, Trivandrum 695010, India
     

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The granite of Chengannoor, Alleppey district, Kerala, having an intrusive relationship with Precambrian charnockite-cordierite gneiss sequence is inferred to be a post-kinematic granite of magmatic origin. The major mineral constituents are mesoperthitic K-feldspar with quartz and two generations of plagioclase. A late/post intrusive potash metasomatism caused changes in the mineralogy and chemical composition of the granite.

Recent K-Ar dating of hornblende from the Chengannoor granite assigns an age of 550 m.y. for the granite (Soman, Golubyev and Santosh. Ind. Jour, Earth Science) (in press).


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  • Petrochemistry of the Chengannoor Granite, Alleppey District, Kerala

Abstract Views: 182  |  PDF Views: 2

Authors

M. Santosh
Centre for Earth Science Studies, P. B. No. 2235, Trivandrum 695010, India
N. G. K. Nair
Centre for Earth Science Studies, P. B. No. 2235, Trivandrum 695010, India

Abstract


The granite of Chengannoor, Alleppey district, Kerala, having an intrusive relationship with Precambrian charnockite-cordierite gneiss sequence is inferred to be a post-kinematic granite of magmatic origin. The major mineral constituents are mesoperthitic K-feldspar with quartz and two generations of plagioclase. A late/post intrusive potash metasomatism caused changes in the mineralogy and chemical composition of the granite.

Recent K-Ar dating of hornblende from the Chengannoor granite assigns an age of 550 m.y. for the granite (Soman, Golubyev and Santosh. Ind. Jour, Earth Science) (in press).