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Physico-chemical conditions of four calc-alkaline granitoid plutons of Chhotanagpur Gneissic Complex, eastern India: Tectonic implications

  • B Goswami
  • P Roy
  • A Basak
  • S Das
  • C Bhattacharyya
Article
  • 88 Downloads

Abstract

Petrography and mineralogy of four calc-alkaline granitoid plutons Agarpur, Sindurpur, Raghunathpur and Sarpahari located from west to east of northern Purulia of Chhotanagpur Gneissic Complex, eastern India, are investigated. The plutons, as a whole, are composed of varying proportions of Qtz–Pl–Kfs–Bt–Hbl±Px–Ttn–Mag–Ap–Zrn±Ep. The composition of biotite is consistent with those of calc-alkaline granitoids. Hornblende–plagioclase thermometry, aluminium-in-hornblende barometry and the assemblage sphene–magnetite–quartz were used to determine the P, T and \(f_{\mathrm{O}_2}\) during the crystallisation of the parent magmas in different plutons. The plutons are crystallised under varying pressures (6.2–2.4 kbar) and a wide range of temperatures (896–\(718{^{\circ }}\hbox {C}\)) from highly oxidised magmas (log \(f_{\mathrm{O}_2}\) \(-11.2\) to \(-15.4\) bar). The water content of the magma of different plutons varied from 5.0 to 6.5 wt%, consistent with the calc-alkaline nature of the magma. Calc-alkaline nature, high oxygen fugacity and high \(\hbox {H}_{2}\hbox {O}_{{\mathrm{melt}}}\) suggest that these plutons were emplaced in subduction zone environment. The depths of emplacement of these plutons seem to increase from west to east. Petrologic compositions of these granitoids continuously change from enderbite (opx-tonalite: Sarpahari) in the east to monzogranite (Raghunathpur) to syenogranite (Sindurpur) to alkali feldspar granite (Agarpur) in the west. The water contents of the parental magmas of different plutons also increase systematically from east to west. No substantial increase in the depth of emplacement is found in these plutons lying south and north of the major shear zone passing through the study area suggesting the strike-slip nature of the east–west shear zone.

Keywords

Calc-alkaline granitoids mineral chemistry intensive parameters Chhotanagpur Gneissic Complex eastern India 

Notes

Acknowledgements

Major research project grant of the UGC [F.-43-367/2014(SR)] and research grant of the University of Calcutta given to B Goswami are gratefully acknowledged. Thanks are due to Prof. Chalapathy Rao and Dr Dinesh Pandit (Department of Geology, Benaras Hindu University) and Dr S Nandy, Sri S K Tripathy and Sri Narahari (EPMA Laboratory, CHQ, GSI, Kolkata) for providing electron microprobe facilities. Painstaking reviews by three anonymous reviewers and their most valuable suggestions helped to improve this paper to a great extent. Supportive editorial handling by Prof. Rajesh Kumar Srivastava and Prof. Chalapathy Rao (Chief editor) is gratefully acknowledged.

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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  • B Goswami
    • 1
  • P Roy
    • 1
  • A Basak
    • 1
  • S Das
    • 1
  • C Bhattacharyya
    • 1
  1. 1.Department of GeologyUniversity of CalcuttaKolkataIndia

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