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

V. Venkatesh ¹

Affiliations
1 Geological Survey of India, Calcutta, IN

Abstract

If the Lonar depression is a meteorite crater, a giant meteorite several-fold richer in nickel and cobalt than the basaltic country rock, should have produced localised enrichment of these metals. Weathering and secondary dispersion, aided by favourable centripetal drainage conditions, should have produced anomalous concentrations of the metals in plants, soil and silt at the site. This is not borne out by the average and below average values of the metals in geochemical samples from the crater area; and recent experimental sampling in the meteorite crater of Arizona also showed similar lack of anomalous metal values. The use of geochemical anomalies in recognising meteorite craters should, therefore, await investigations in other established craters.

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Minaxi Pal ¹, V. Venkatesh ², A. K. Balyan ³, A. Sarkar ⁴

Affiliations
1 Geochemistry Division, KDMIPE, ONGC, Dehra Dun., IN
2 Geology Group, I-A, Vasundhara Bhavan, ONGC, Bandra East, Bombay, IN
3 ONGC, Makarpura Road, Baroda., IN
4 Dept. of Applied Sciences, ISM, Dhanbad, IN

Abstract

Several workers have proposed that coals can be regarded as possible source rocks of oil and gas. The present study was undertaken with the objective of geochemical evaluation of coals and associated shales of Kamthi sub-basin of Pranhita-Godavari Graben. The studies indicate that Barakars of Kamthi sub-basin contain sufficient humic organic matter deposited in intermediate to swampy environment. The organic matter is immature and is capable of generating only gaseous hydrocarbons.

Keywords

Hydrocarbon, Gondwana Basins, Pranhita-Godavari Graben.

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