Episodes 2025; 48(1): 1-20
Published online March 1, 2025
https://doi.org/10.18814/epiiugs/2024/024006
Copyright © International Union of Geological Sciences.
Samarendra Bhattacharya1,3, Miguel Angelo Stipp Basei2, Rajib Kar3*, Mathias Hueck2,4, Sanchari Chatterjee3, Anwesha Ghosh3
1 Geological Studies Unit, Indian Statistical Institute, Kolkata 700108, India
2 Geoscience Institute, University of São Paulo, São Paulo 05508080, Brazil
3 Department of Geology, University of Calcutta, Kolkata 700019, India
4 Institute for Geology, Mineralogy and Geophysics, Ruhr University, Bochum 44780, Germany
Correspondence to:*E-mail: rkgeol@caluniv.ac.in
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
The Southern Granulite Terrane (Dharwar Craton), South India, is a key unit for understanding the origin of charnockite. New U-Pb and Lu-Hf analyses in zircon crystals from 16 samples representing a wide variety of lithotypes from the quarries in Kabbaldurga reveal a complex geological history in the Archean and early Paleoproterozoic. Magmatic protoliths predominantly record Paleoarchean ages between 3.4 and 3.2 Ga. Combined U-Pb and Lu-Hf signatures indicate a history of recurrent crustal anatexis, juvenile magmatic input, and felsic injections. Mesoarchaean magmatic charnockites were generated mainly from hornblende-dehydration melting of Paleoarchaean mafic rocks. In addition, Peninsular Gneissic Complex of the Dharwar Craton, commonly described as TTG suites, are likely generated by melting of hydrated basalt. The new data are consistent with the idea of a convecting magmatic cycle and also support the proposal that the southern Dharwar Craton comprises a tilted cross-section through the Archaean crust. Paleoproterozoic hightemperature event is documented here as a complex unit involving juvenile mafic magmatism, granulite facies imprints and crustal anatexis as well as felsic injections, occurring within a short time period around 2.5 Ga.
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