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

S. Narasimha ¹

Affiliations
1 Geologist, Geological Survey of India, IN

Abstract

An occurrence of Deccan Trap outlier over Hutti schist belt of Precambrian age is reported. The traps are found at an elevation of 560m as against their occurrence between 500 and 520m contours north of the Krishna river. This is attributed to an ENE-WSW trending post trappean fault along the present course of river Krishna. A thin spread of waterworn cobbles and pebbles of orthoquartzite, sandstone, slate and chert of Kaladgi affinity is seen below the Deccan Trap.

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S. Narasimha ¹, S. K. Hans ¹

Affiliations
1 Geological Survey of India, IN

Abstract

Equivalents of Sargur Group of rocks are recognised for the first time in northern parts of Karnataka. In the area northwest of Hutti, Raichur district, medium to high grade metamorphic rocks namely, amphibolite, banded ironstone (amphibole-magnetite- bearing chert), meta-sediments (fuchsite quartzite and sillimanite-bearing pelites) and meta-ultrabasics, occur as a linear belt and as isolated enclaves in Peninsular gneiss. The name' Gurgunta Schist Belt' has been given in order to distinguish it from the Hutti Schist Belt. Alkali granites and dolerite dykes are younger intrusives. The gneiss and the enclaves have suffered three phases of folding deformation giving rise to the present outcrop pattern of an oval shaped dome. Faults post date the folding events in the area.

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S. Narasimha ¹

Affiliations
1 Geological Survey of India, Op Karnataka and Goa, Bangalore, IN

Abstract

No Abstract.

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S. Narasimha ¹

Affiliations
1 1409. 23rd Main, Banashankari II Stage, Bangalorc 560 070, IN

Abstract

This paper records the occurrence of volcanic rocks associated with the Tertiary sediments in Meghalaya. They are acidic in composition and can be classed as 'Ash falls and Ash flows,' indicative of explosive volcanic activity during early Tertiary times.

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