• J Ratnakar

      Articles written in Journal of Earth System Science

    • The Purimetla gabbros, Prakasam District, Andhra Pradesh, India

      J Ratnakar C Leelanandam

      More Details Abstract Fulltext PDF

      Gabbros at Purimetla occur in close association with the alkaline pluton. Petrography and petrochemistry of these gabbros indicate their tholeiitic nature. Chemical variation of these tholeiites suggests that an initial undersaturated tholeiitic magma yielded oversaturated fractions in the final stages of differentiation. Their regional distribution suggests that basic magmatism preceded the emplacement of the alkaline rocks in the Prakasam alkaline province.

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