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

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Rapakivi Granite of Ezhimala Complex and its Significance


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1 Geological Survey of India, Southern Region, Hyderabad, India
     

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The field characters, chemistry and the spatial association of the 678 m.y. old Rapakivi granite with gabbros and anorthosites suggest that these litho-units have developed through bimodal magmatic processes whereby heat derived from basic magma parental to the anorthositic rocks caused partial melting at or near the base of the crust to produce granitic magma with Rapakivi characteristics.
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  • Rapakivi Granite of Ezhimala Complex and its Significance

Abstract Views: 175  |  PDF Views: 2

Authors

M. M. Nair
Geological Survey of India, Southern Region, Hyderabad, India
K. T. Vidyadharan
Geological Survey of India, Southern Region, Hyderabad, India

Abstract


The field characters, chemistry and the spatial association of the 678 m.y. old Rapakivi granite with gabbros and anorthosites suggest that these litho-units have developed through bimodal magmatic processes whereby heat derived from basic magma parental to the anorthositic rocks caused partial melting at or near the base of the crust to produce granitic magma with Rapakivi characteristics.