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

C. R. Gathania ¹, A. K. Chattopadhyay ¹, B. Sharma ¹, S. S. Ameta ¹, A. K. Ghosal ¹

Affiliations
1 Geological Survey of India, Jhalana Dungri, Jaipur-302004, IN

Abstract

Preliminary study of the ultramafic suite of rocks emplaced concordantly in the Proterozoic supracrustals of the southern Rajasthan (Aravalli Supergroup) indicates their komatiitic nature. Though the diagnostic spinifex texture is not observed in the highly serpentinised and metamorphosed ultramafics, the amygdaloidal structure and the previously reported igneous joints provide textural evidences for the extrusion of the ultramafic lava. The altered ultramafics still retain certain chemical signatures (high MgO and Mg-No., low Ti0₂, Al₂O₃and alkalis) of standard komatiites.

Keywords

Ultramafics, Komatiites,Rikhabdev-Lineament, Supracrustals, Aravalli Supergroup, Rajasthan.

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