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

V. B. Bhanot ¹, Veer Pal Singh ¹, Ashok K. Kansal ¹, Vikram C. Thakur ²

Affiliations
1 Physics Department, Panjab University, Chandigarh, IN
2 Wadia Institute of Himalayan Geology, Dalanwala, Dehradun, IN

Abstract

Rb-Sr isochron age of 1830 m.y. has been obtained for an outcrop in the Higher Himalaya of Kumaun.

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V. B. Bhanot ¹, Suresh K. Kwatra ¹, Ashok K. Kansal ¹, B. K. Pandey ¹

Affiliations
1 Physics Department, Panjab University, Chandigarh, IN

Abstract

Rb-Sr isochron age of 1430±150 m.y. has been obtained for the gneissic member of Chails exposed near Nirath and Baragaon of Northwestern Himalaya.

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V. B. Bhanot ¹, A. K. Bhandari ², V. P. Singh ¹, Ashok K. Kansal ¹

Affiliations
1 Physics Department, Panjab University, Chandigarh, IN
2 Geological Survey of India, Sector-17, Chandigarh, IN

Abstract

Rb-Sr whole-rock data is presented for a biotite-granite of Central Crystallines. The whole-rock isochron age is found to be 467±45 m.y. This should represent the time of intrusion of the granite. A brief account of the geology and petrography is also presented. The age of the biotite is found to be 8.8±2.0 m.y., which is the youngest Rb-Sr age reported so far for a mineral from the Himalaya. This fixes the period when the rocks of this area, after being heated and uplifted, cooled to a temperature of about 300°C.

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