Geochemical characteristics, discrimination and petrogenesis of Neoproterozoic peralkaline granites, Barmer District, SW Rajasthan, India

Anil Maheshwari*, Massimo Coltorti, Sandeep K. Rajput, Mukesh Verma

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The Malani Igneous Suite is characterized by discontinuous, ring-shaped outcrops of peralkaline granite associated with minor exposures of volcanic rocks around Barmer town in southwestern Rajasthan, India. These granites are defined as peralkaline, within plate, and A-type based on their bulk rock compositions. The most distinctive geochemical characteristics of these A-type granites are enrichments in Na2O+K2O, Fe/Mg, Zr, Nb, Y, depletions in Al2O3, CaO, Sr, and low-absolute abundances of incompatible trace elements compared to granites from adjoining areas. The igneous activity is considered as a reflection of the 'Pan-African Event'. The correlative mineralogy, chemical characteristics, and tectonic setting of the peralkaline granites from the study area, and comparison with data from adjoining areas, suggest their generation under a common thermal event.

Original languageEnglish
Pages (from-to)1103-1120
Number of pages18
JournalInternational Geology Review
Volume51
Issue number12
DOIs
Publication statusPublished - Dec 2009
Externally publishedYes

Keywords

  • Geochemistry
  • Malani Igneous Suite
  • Peralkaline granite
  • Petrogenesis

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