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Pande, K.
- Rb-Sr Age of the Tusham Ring Complex, Bhiwani, India
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Authors
Affiliations
1 Department of Geology, Punjab University, Chandigarh 160014, IN
2 Physical Research Laboratory, Navrangpura, Ahmedabad 380009, IN
1 Department of Geology, Punjab University, Chandigarh 160014, IN
2 Physical Research Laboratory, Navrangpura, Ahmedabad 380009, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 26, No 3 (1985), Pagination: 216-218Abstract
Acid volcanics and associated granites from the Tusham Ring Complex in northwestern India yield a well defined Rb-Sr isochron corresponding to an age of 754±20 Ma (λ=1.42 x 10-11 yr-1 ) and an initial Sr composition of 0.7131±0.0025. This is in good agreement with the age of the Malani suite of igneous rocks of western Rajasthan.
- 40Ar-39Ar Darting of Deccan Basalts
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Authors
Affiliations
1 Physical Research Laboratory, Ahmedabad 380 009, IN
1 Physical Research Laboratory, Ahmedabad 380 009, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 27, No 1 (1986), Pagination: 102-109Abstract
The feasibility of dating igneous rocks by the 40Ar-39Ar method in India using the Apsara nuclear reactor at BARC, Bombay is reported, based on measurements on two tholeiitic basalts and one alkali basalt associated with the Deccan volcanism. The ages of the tholeiitic basalts are 71±4 Ma and 65±4 Ma, respectively and that of the alkali basalt is 682 Ma. Apart from the low neutron flux requiring long irradiation times, the neutron fluence within the sample irradiation volume is somewhat anisotropic. The latter needs to be minimised to achieve the higher precision the method is capable of.- Rb-Sr Geochronology of the Ambalavayal Granite, Kerala
Abstract Views :207 |
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Authors
Affiliations
1 Centre for Earth Science Studies, P. B. 2235, Sasthamangalam, Trivandrum 695 010, IN
2 Physical Research Laboratory, Navarangpura, Ahmedabad 380 009, IN
1 Centre for Earth Science Studies, P. B. 2235, Sasthamangalam, Trivandrum 695 010, IN
2 Physical Research Laboratory, Navarangpura, Ahmedabad 380 009, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 27, No 3 (1986), Pagination: 309-312Abstract
Rubidium and strontium determinations are reported for seven whole-rock samples of the Ambalavayal granite of northern Kerala. The data yield a well defined Rb-Sr isochron, corresponding to an age of 595 ± 20 Ma and initial 87Sr/86Sr ratio of 0.7171 ± 0.0022. The age marks a regime of Late Precambrian-Early Palaeozoic granite magmatism in the southwestern Indian shield. The agreement of the Rb/Sr age with the previously measured K/Ar age of 560± 30 Ma indicates no significant secondary thermal event in the region. The evolved initial Sr ratio suggests either an exclusive origin or significant crustal contamination of magma derived from a deeper source.Full Text
- Rb-Sr Age of the Belka Pahar Granite, Sirohi District, Rajasthan
Abstract Views :194 |
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Authors
Affiliations
1 Department of Geology, University of Poona, Pune 411 007, IN
2 Physical Research Laboratory, Ahmedabad 380 009, IN
3 National Geophysical Research Institute, Hyderabad 500 007, IN
1 Department of Geology, University of Poona, Pune 411 007, IN
2 Physical Research Laboratory, Ahmedabad 380 009, IN
3 National Geophysical Research Institute, Hyderabad 500 007, IN