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Bombolai continental pillow lavas Neoproterozoic from trans-Aravalli region, Pali District, Rajasthan and their tectonic significance


, : Bombolai continental pillow lavas Neoproterozoic from trans-Aravalli region, Pali District, Rajasthan and their tectonic significance. Journal of the Geological Society of India 64(6): 803-812

Neoproterozoic Bombolai volcanics of Trans-Aravalli terrain of western Rajasthan, consist of three distinct flows separated by metasediments including bedded chert, phyllite and quartzite. In terms of their major oxides and trace and rare earth element abundances, all these flows are compositionally identical and evolved (Mg. No. 0.397-0.474, Ni--61-92 ppm and Cr--172-234 ppm). Major and trace element contents permit one to classify them as subalkaline basalts having enriched LREE abundances. However, MORB and PM-normalised spidergrams characterize them as within plate tholeiites. On the basis of their TiO (sub 2) content (1.84-2.43), Ti/Y ratio (294-347) and Zr/Y ratio (2.9-3.7), the Bombolai volcanics are classified as low Ti-continental tholeiites. The general geology, geochemistry and associated lithologies indicate that the Bombolai volcanics were erupted in a reactivated rift environment (Pali lineament) which probably occurred as a precursor event to a large magmatic activity i.e. Malani volcanism in Trans-Aravalli region.

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