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

P. K. R. Nair ¹, V. Prasannakumar ¹, Thomas Mathai ¹

Affiliations
1 Department of Geology, University of Kerala, Kariyavattom, Trivandrum 695581, IN

Abstract

On the basis of structural investigations in an area of over 150 sq. km forming the western termination of the Bhavani lineament, the validity of the simple shear strain model adopted by Katz to explain movements along the lineament is examined. The model explains satisfactorily the formation of the first two of the three generation of folds recognised as well as the associated foliation and mineral lineation whereas it cannot be applied in the case of the last generation of folds.

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V. Prasannakumar ¹, P. K. R. Nair ¹, Eric D'cruz ¹

Affiliations
1 Department of Geology, University of Kerala, Trivandrum 695581, IN

Abstract

At Marutha, located in the high-grade granulite terrain of South India, gold in association with pyrite and chalcopyrite occurs along the contacts of quartz veins with amphibolite. Structures of the area were produced during two deformational events. Gold-bearing quartz veins were formed before the onset of second deformational event. Amphibolite of Marutha, geochemically comparable with the metavolcanics of Kolar and Hutti, is derived from low-K-tholeiitic basalt and has no komatiitic affinity. Tholeiitic basalt is the probable source of gold at Marutha.

Keywords

Economic Geology, Gold, Kerala, Precambrian, Marutha.

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V. Prasannakumar ¹, P. K. R. Nair ¹

Affiliations
1 Dept. of Geology, University of Kerala, Kariavattom, Trivandrum, 695581, IN

Abstract

The optic direction Y in hornblende in the lower amphibolite facies rocks of the southern part of the Chitradurga schist belt is parallel to the hinge lines of the earliest folds. Hornblende orientation and the temporal relations between crystallisation, folding and formation of foliation point to ENE- WSW compression at the time of deformation.

Keywords

Fold Analysis, Hornblende Fabric.

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