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

Syed H. Akhter ¹, A. K. Bhattacharya ¹, D. K. Sen Gupta ¹, I. K. Kaul ¹

Affiliations
1 Department of Geology and Geophysics, I. I. T., Kharagpur 721 302, IN

Abstract

Thermoluminescence (TL) studies on the metasediments of Jabar, lying in the northwestern part of Purulia district of West Bengal, show natural thermoluminescence (NTL). These metasediments of Precambrian age, predominantly consist of marble, calc-silicates and granite gneiss. Each of the representative rock sample exhibits distinct TL glow-curves which can be successfully utilised in a number of geological applications. On the basis of natural as well as artificial thermoluminescence glow-curves, two distinct types of marble sequence have been identified.

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I. K. Kaul ¹, C. N. Rao ¹, T. Sanyal ¹

Affiliations
1 Department of Geology and Geophysics, I.I.T., Kharagpur 721302, IN

Abstract

A new technique to determine the homogenization temperatures of fluid inclusions is described. The technique is based on the principle of optical density and involves no ambiguity in recording homogenization temperatures unlike in the standard heating stage method where because of problems of visual clarity of liquid phase disappearance, accurate measurement of homogenization temperatures becomes difficult and unreliable. A comparison of the two methods shows that the present technique gives somewhat higher values than those based on heating stage method.

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