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

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Crustal Influences in the Petrogenesis of the Malani Rhyolites, SouthWestern Rajasthan: Combined Trace Element and Oxygen Isotope Constraints


Affiliations
1 Department of Geology, University of Rajasthan, Jaipur-302 004, India
2 Istituto di Mineralogia, Universita di Ferrara, Italy
3 Department of Geology, UFPE, Recife, 50.732-970, Brazil
     

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The Malani volcanics of Gurapratap Singh and Din belong to a basalt-andesite -dacite-rhyolite association of Precambrian age. The preponderance of rhyolites over basic and intermediate rocks is a significant feature of the area. The rhyolities are characterised by chemical features, which indicate their A-type affinity. The study rules out their cogeneticity and suggests the crustal involvement in the genesis of Malani rhyolites.

Keywords

Petrology, Oxygen Isotopes, Malani Volcanics, Rajasthan.
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  • Crustal Influences in the Petrogenesis of the Malani Rhyolites, SouthWestern Rajasthan: Combined Trace Element and Oxygen Isotope Constraints

Abstract Views: 187  |  PDF Views: 1

Authors

A. Maheshwari
Department of Geology, University of Rajasthan, Jaipur-302 004, India
M. Coltorti
Istituto di Mineralogia, Universita di Ferrara, Italy
A. N. Sial
Department of Geology, UFPE, Recife, 50.732-970, Brazil
G. Mariano
Department of Geology, UFPE, Recife, 50.732-970, Brazil

Abstract


The Malani volcanics of Gurapratap Singh and Din belong to a basalt-andesite -dacite-rhyolite association of Precambrian age. The preponderance of rhyolites over basic and intermediate rocks is a significant feature of the area. The rhyolities are characterised by chemical features, which indicate their A-type affinity. The study rules out their cogeneticity and suggests the crustal involvement in the genesis of Malani rhyolites.

Keywords


Petrology, Oxygen Isotopes, Malani Volcanics, Rajasthan.