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Geology and tectonic implications of tourmaline bearing leucogranite of Bastipadu, Kurnool, Andhra Pradesh, India

  • Kiran Jyoti Mishra
  • Santanu Bhattacharjee
  • M S Reddy
  • M N Praveen
  • A D Bhimte
  • N Mahanta
Article

Abstract

Tourmaline bearing leucogranite occurs as a pluton with pegmatitic veins intruding the Archaean granodiorite in the Bastipadu area, Kurnool district of Andhra Pradesh. We present field and petrographic relations, mineral chemistry and geochemical data for the leucogranite. It is essentially a two-mica granite, composed of quartz, perthite, microcline, albite, tourmaline and muscovite along with minor biotite and titanite. The euhedral tourmalines are regularly distributed in the rock. The geochemical studies show that the leucogranite is calc-alkaline, peraluminous to metaluminous which formed in a syn-collisional to volcanic arc-related setting. It displays strong ‘S’ type signatures with high K/Na ratios, moderately fractionated light rare earth elements, relatively flat heavy rare earth elements with \(\hbox {[Ce/Yb]}_\mathrm{N} \le 27.8\) and a strong negative Eu anomaly. The geochemical characteristics indicate that the leucogranite melt might have been generated from partial melting of metasediments. Electron probe microanalyser data show the presence of alkali group tourmaline in leucogranite represented by schorl and dravite. Tourmaline compositions plot in the Li-poor granitoids and associated pegmatites and aplites and metapelites/metasammites fields. Partial melting of boron-enriched source rocks is linked with the development of tourmalines in the leucogranite.

Keywords

Bastipadu tourmaline borosilicate schorl leucogranite 

Notes

Acknowledgements

The authors are thankful to Deputy Director General, State Unit, Andhra Pradesh for the logistic support in the field, officer of Chemical Division, Southern Region for providing chemical data. The authors express sincere gratitude to the officers of the Petrology Division, GSI, SR for providing EPMA analyses. The authors are also thankful to the officers of the Petrology Division, GSI, SR for providing XRF and ICP-MS analyses.

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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.Geological Survey of India, Southern RegionHyderabadIndia

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