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

Shabber H. Alvi ¹, M. Raza ¹

Affiliations
1 Department of Geology, Aligarh Muslim University, Aligarh 202002, IN

Abstract

Jagannathpur volcanics which occur as faulted outliers within the Noa· mundi-Koira sequence of banded iron formation (BIF) of Singhbhum are analysed for major and selected trace elements. Chemical data indicate that the volcanics are calc-alkaline basalts. High MgO, Ni, Cr along with intermediate Si0₂, low CaO/Al₂0₃ ; Ti/Zr and high Zr/Y ratios in majority of the samples match well with modern boni- nites. It would, therefore, appear that Jagannathpur volcanics represent ao early phase of arc volcanism.

Keywords

Basaltic Volcanism, Boninite, Subduction zone, Jagannathpur Volcanics, Singhbhum, Bihar.

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