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

A. N. Shah ¹, P. P. Patel ²

Affiliations
1 Indian Co-Operation Mission, Kathmandu, NP
2 Department of Geology. M. S. University of Baroda, Baroda 2, IN

Abstract

The granitic gneisses of Lansdowne area form a part of the Amri unit of Garhwal nappe, formed before the main Himalayan orogeny. Field and petrological observations indicate that they have been thrust along with the crystalline rocks of Amri unit and there is no separate thrust contact between them. Chemical analysis and Petrography of the samples of gneisses from the margin to the centre show a progressive increase in feldspar-content which suggests a metasomatic origin for these granitic gneisses.

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P. P. Patel ¹, V. G. Malkan ², J. V. Bhatt ³

Affiliations
1 Mineral Exploration Circle, Kothi Building, Baroda-390001, IN
2 0-19, New Mental Hospital Building, Ahmedabad-380016, IN
3 Ahmedabad-380016, IN

Abstract

A bed of chalk white, soft, earthy, stratified material off the Bhavnagar coast is identified as diatomite. It rests unconformably over lateritic material of Lower Eocene age and is conformably overlain by clayey beds. The diatomite and clay beds have been tentatively correlated with the Gaj beds of Miocene age.

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