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

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Geochronological and Geological Studies on a Granite of Higher Himalaya, Northeast of Manikaran, Himachal Pradesh


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

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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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  • Geochronological and Geological Studies on a Granite of Higher Himalaya, Northeast of Manikaran, Himachal Pradesh

Abstract Views: 142  |  PDF Views: 4

Authors

V. B. Bhanot
Physics Department, Panjab University, Chandigarh, India
A. K. Bhandari
Geological Survey of India, Sector-17, Chandigarh, India
V. P. Singh
Physics Department, Panjab University, Chandigarh, India
Ashok K. Kansal
Physics Department, Panjab University, Chandigarh, India

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.