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

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Rb-Sr whole-Rock Isochron Age of Early Proterozoic Potassic Granite from Dharmawaram, Karimnagar District, Andhra Pradesh


Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begump et, Hyderabad - 5000 16, India
 

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Whole-rock Rb-Sr isochron dating of pink potassic (av.5% K2O) granite from Dharmawaram, Karimnagar district, Andhra Pradesh, defines an isochron corresponding to an age of 2237±46 Ma with initial 87Sr/86Sr ratio of 0.71052±0.00084. The data suggest possible emplacement of potassic granite of Dharmawaram during early Proterozoic at ca. 2237 Ma. Further, high initial 87Sr/86Sr isotopic ratio of granite also indicates involvement of silicic crustal material in its genesis.
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  • Rb-Sr whole-Rock Isochron Age of Early Proterozoic Potassic Granite from Dharmawaram, Karimnagar District, Andhra Pradesh

Abstract Views: 172  |  PDF Views: 145

Authors

Yamuna Singh
Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begump et, Hyderabad - 5000 16, India
K. D. P. Singh
Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begump et, Hyderabad - 5000 16, India
R. N. Prasad
Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begump et, Hyderabad - 5000 16, India

Abstract


Whole-rock Rb-Sr isochron dating of pink potassic (av.5% K2O) granite from Dharmawaram, Karimnagar district, Andhra Pradesh, defines an isochron corresponding to an age of 2237±46 Ma with initial 87Sr/86Sr ratio of 0.71052±0.00084. The data suggest possible emplacement of potassic granite of Dharmawaram during early Proterozoic at ca. 2237 Ma. Further, high initial 87Sr/86Sr isotopic ratio of granite also indicates involvement of silicic crustal material in its genesis.