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Sarkar, Amitabha
- K-Ar Ages of Indian Kimberlites
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Authors
Affiliations
1 Geological Survey of India, Calcutta, IN
1 Geological Survey of India, Calcutta, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 19, No 12 (1978), Pagination: 584-584Abstract
No Abstract.- Lamprophyres from Indian Gondwanas - K-Ar Ages and Chemistry
Abstract Views :177 |
PDF Views:2
Authors
Affiliations
1 Geochronology and Isotope Geology Division, Geological Survey of India, 29, Jawaharlal Nehru Road, Calcutta 700 016, IN
2 Chemical Laboratory, Geological Survey of India, 27, Jawaharlal Nehru Road, Calcutta 700016, IN
1 Geochronology and Isotope Geology Division, Geological Survey of India, 29, Jawaharlal Nehru Road, Calcutta 700 016, IN
2 Chemical Laboratory, Geological Survey of India, 27, Jawaharlal Nehru Road, Calcutta 700016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 21, No 4 (1980), Pagination: 188-193Abstract
Lamprophyric dyke rocks occurring in the Indian Gondwanas (Permian-Lower Cretaceous) form a consanguinous suite ranging from ultrabasic mica-peridotite to micro-syenitic assemblages. Chemical characters include low SiO2 (ca. 40% or less), high (FeO+MgO) and high MgO/FeO and K2O/Na2O ratios. The petrographic and chemical characters have been discussed in a broad framework after Rock (1977). K-Ar radiometric ages on four biotite separates and one whole rock from three different localities range from 105 to 121 Ma and are believed to represent true crystallisation ages.- 40K/40Ar Ages of a Suite of Lower Palaeozoic Post-Tectonic Granitoids, Southern India
Abstract Views :239 |
PDF Views:152
Authors
Affiliations
1 Geological Survey of India, 40th Cross, Jayanagar, Bangalore 560041, IN
2 Geochronology Division, Geological Survey of India, Calcutta 700 016, IN
1 Geological Survey of India, 40th Cross, Jayanagar, Bangalore 560041, IN
2 Geochronology Division, Geological Survey of India, Calcutta 700 016, IN