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

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New Rb-Sr Age of Kanara Granite, South Kanara District, Karnataka State


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1 Geochronology and Isotope Geology Division, Geological Survey of India, Calcutta, India
 

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New Rb-Sr isotopic age is presented for the porphyritic phase of Kanara batholith of South Kanara, Karnataka. The porphyritic granite has a good spread of Rb/Sr ratio and indicates an isochron age of 2681 ± 236 Ma with an initial ratio of 0.7022 ± 0.004. The observed low initial Sr ratio suggests its derivation from mantle without much crustal contamination.
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  • New Rb-Sr Age of Kanara Granite, South Kanara District, Karnataka State

Abstract Views: 216  |  PDF Views: 163

Authors

M. N. Balasubrahmanyan
Geochronology and Isotope Geology Division, Geological Survey of India, Calcutta, India
P. K. Bishui
Geochronology and Isotope Geology Division, Geological Survey of India, Calcutta, India
K. C. Chandy
Geochronology and Isotope Geology Division, Geological Survey of India, Calcutta, India
S. N. Gupta
Geochronology and Isotope Geology Division, Geological Survey of India, Calcutta, India
N. K. Jana
Geochronology and Isotope Geology Division, Geological Survey of India, Calcutta, India
D. K. Paul
Geochronology and Isotope Geology Division, Geological Survey of India, Calcutta, India
R. Prasad
Geochronology and Isotope Geology Division, Geological Survey of India, Calcutta, India

Abstract


New Rb-Sr isotopic age is presented for the porphyritic phase of Kanara batholith of South Kanara, Karnataka. The porphyritic granite has a good spread of Rb/Sr ratio and indicates an isochron age of 2681 ± 236 Ma with an initial ratio of 0.7022 ± 0.004. The observed low initial Sr ratio suggests its derivation from mantle without much crustal contamination.