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Zircon U-Pb age and petrogenetic constraints on granitic magmatism from the southwestern Chhotanagpur Granite Gneiss Complex: Implications for Proterozoic crustal growth in the Central India.

Qasim M, Mahapatro SN, Ranjan S, Asokan AD, Sarma DS, Mohan MR.

PRECAMBRIAN RESEARCH

https://doi.org/10.1016/j.precamres.2025.107783 

This study investigates the Proterozoic granitic magmatism in the southwestern Chhotanagpur Granite Gneiss Complex (CGGC) through zircon U-Pb geochronology, bulk rock geochemistry, and Nd isotopes. Four granitoid types, namely, migmatitic granitic gneiss, foliated granite, porphyritic granite, and the equigranular granite are identified based on field relationships and petrographic features. These granitoids exhibit distinct emplacement ages at ca. 1660 Ma, 1565 Ma, 1462 Ma, and ca. 1140 Ma. Corresponding bulk rock geochemistry and Nd isotope signatures infer the change in tectonic regime from arc to post-collisional. These results suggest that the crustal growth and tectonic evolution in the central India during the Proterozoic is linked to the assembly, breakup, and amalgamation of supercontinents Columbia and Rodinia, respectively.

Representative zircon CL images and U-Pb concordia diagrams for the studied granitoids from the southwestern CGGC.

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