Geochemical characteristics of Proterozoic granite magmatism from Southern Granulite Terrain, India: Implications for Gondwana

  • T Yellappa
  • J Mallikharjuna Rao


Granitoid intrusions occur widely in the Southern Granulite Terrain (SGT) of India, particularly within the Cauvery Suture Zone (CSZ), which is considered as the trace of the Neoproterozoic Mozambique ocean closure. Here we present the petrological and geochemical features of 19 granite plutons across the three major tectonic blocks of the terrain. Our data show a wide variation in the compositions of these intrusions from alkali feldspathic syenite to granite. The whole rock geochemistry of these intrusions displays higher concentrations of \(\hbox {SiO}_{2}\), FeO*, \(\hbox {K}_{2}\hbox {O}\), Ba, Zr, Th, LREE and low MgO, \(\hbox {Na}_{2}\hbox {O}\), Ti, P, Nb, Y and HREE’s. The granitoids are metaluminous to slightly peraluminous in nature revealing both I-type and A-type origin. In tectonic discrimination plots, the plutons dominantly show volcanic arc and syn-collisional as well as post-collisional affinity. Based on the available age data together with geochemical constrains, we demonstrate that the granitic magmatism in the centre and south of the terrain is mostly associated with the Neoproterozoic subduction–collision–accretion–orogeny, followed by extensional mechanism of Gondwana tectonics events. Similar widespread granitic activity has also been documented in the Arabian Nubian shield, Madagascar, Sri Lanka and Antarctica, providing similarities for the reconstruction of the crustal fragments of Gondwana supercontinent followed by Pan-African orogeny.


Southern granulite terrain Cauvery suture zone I-type and A-type granites Neoproterozoic subduction Gondwana 



The authors wish to thank the Director, NGRI, Hyderabad for the encouragement and support during the progress of the work. We are thankful to our colleagues Dr. A Keshava Krishna and Dr. M Satyanarayanan for their help in geochemical analysis. We are also very much thankful to anonymous reviewers for their helpful suggestions to improve the paper. This work also forms a part of Department of Science and Technology,Government of India, sponsored project(Ref: SR/FTP/ES-61/2014).


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© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.National Geophysical Research Institute (Council of Scientific and Industrial Research)HyderabadIndia

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