Petrology of the dyke rocks of the western portions of Rajpipla hills,Broach district,Gujarat, India |
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| Authors: | P Krishnamurthy |
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| Institution: | 1. Centre of Advanced Study in Geology, University of Saugar, Sagar, M.P., India
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| Abstract: | The paper embodies the field, petrographic and petrochemical studies of the dykes occuring within the Deccan basalts, in the Western portions of Rajpipla hills. Major and minor dykes with different trends occur in the area varying in thickness from 2′ to 75′ and traceable lengthwise from few to several miles. The density of the dyke distribution is two per mile. The composition of the minor dykes ranges from teschenite to trachyte with dominant basaltic types and they seem to be coeval with the flows of the area. The major dolerite dykes are found to be post-lava. Both alkali-olivine basalt and tholeiitic types occur. The former phase preceeds the latter and includes the minor alkaline dykes. A differentiation trend based on new chemical analyses is proposed. |
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