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

M. K. Nagpal ¹, K. K. Nagpaul ¹, Mihir K. Bose ²

Affiliations
1 Physics Department, Kurukshetra University, Kurukshetra, IN
2 Department of Geology, Presidency College, Calcutta, IN

Abstract

Attempt has been made to date the alkaline suites of India on the basis of fission track analysis of apatite. The alkaline plutons of the Eastern Ghats Belt appear to be related to a late Precambrian tecto-igneous activity though all the intrusions may not be strictly synchronous. New age data on some alkaline rocks from the Deccan volcanic province indicate the related magmatism to be older than the available age level for the bulk of Deccan lavas. The apparently isolated occurrence of alkaline complex of Mundwara in Sirohi, Rajasthan has been related to Deccan volcanicity on the basis of apatite ages.

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Rajinder Parshad ¹, Nand Lal ², K. K. Nagpaul ¹

Affiliations
1 Department of Physics, Kurukshetra University, Kurukshetra-132119, IN
2 Electrologging Section, Oil and Natural Gas Commission, Ahmedabad-380005, IN

Abstract

Fission track ages of two cogenetic minerals viz., garnet and apatite collected from the pegmatites of Nellore Mica. Belt of India, emplaced during the closing stages of the Eastern Ghats Orogeny (1500-1600 Ma) are found to be 1065 Ma and 440 Ma respectively. The data has been interpreted in terms of tectonic uplift of the pegmatites. The average rate of uplift for this region has been calculated as 0.04 mm/year.

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Kewal K. Sharma ¹, Vinay M. Chousey ², O. P. Sharma ², K. K. Nagpaul ²

Affiliations
1 Wadia Institute of Himalayan Geology, 15, Municipal Road, Dehradun 248001, IN
2 Department of Physics, Kurukshetra University, Kurukshetra 132 119, IN

Abstract

Uranium distribution in Vertebrate Fossils from the Siwaliks of NW-Himalaya has been worked out using Fission Track Method. Uranium is found to be uniformly distributed in collophane and ferruginous material of the bone and a sympathetic relationship between uranium and collophane content has been observed. Percolating waters which leached uranium and phosphorus from the granitic matrix (80 to 90%) of the Siwalik sandstones appear to have brought about diagenesis, uranium mineralization and fossilisation of the organic remains in the Siwalik sediments.

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