The petrochemistry and significance of jogimardi traps,chitaldrug schist belt,Mysore |
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| Authors: | S M Naqvi |
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| Institution: | 1. National Geophysical Research Institute, Hyderabad-7, A.P.
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| Abstract: | Forty-two samples of the Jogimardi trap from Chitaldrug schist belt, Mysore, were analysed for their major elements. It is inferred that the Jogimardi trap is a submarine lava flow of eugeosynclinal environment. The composition of the suite varies from tholeiitic basalt to andesite and spilite. The original magma, which was probably tholeiitic in nature, might have given rise to this association due to varying and incomplete degree of spilitisation, which in turn seems to be related to the short period of contact between metasomatic liquid and the tholeiitic flows. The suite bears the imprint of low grade metamorphism of green schist facies. This resulted in the development of mineral assemblage comprising chlorite, epidote and plagioclase but without bringing about any change in the original basaltic texture. At and near the contact with granite, the tholeiitic lava was converted into orthoamphibolite, most probably due to granitie intrusion. |
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