SHAKTI SINGH RATHORE
Articles written in Journal of Earth System Science
Volume 131 All articles Published: 3 September 2022 Article ID 0192 Research article
PIYUSH GUPTA SHAKTI SINGH RATHORE SANDEEP SINGH
The Cauvery Basin, formed as a result of the fragmentation of Gondwana during the Late Jurassic/Early
Cretaceous period, is located on the eastern continental margin of India. The basin, covered under thick
Phanerozoic sediments, has a geochronological lesser understood basement that forms the easternmost
extremity of the Madurai Block in the Southern Granulite Terrane. This paper reports Rb–Sr and Sm–Nd
ages between 2173–2307 Ma from northern onshore and Rb–Sr ages between 1223–983 Ma from southern
offshore parts of the basin. The studied samples include basement core samples of hornblende–gneisses,
granites, and metapelites (chlorite–biotite and garnet–biotite schists). These ages represent at least two
episodes of tectonothermal events during Early Paleoproterozoic and Late Neoproterozoic, suggesting a
polymetamorphic history of the basement and are correlatable with the reported events. The study also
yielded Early Paleozoic Cambro–Ordovician whole-rock-biotite mineral Rb–Sr ages of 443–487 Ma,
coinciding with the cooling stages of the Pan-African tectonothermal event post the thermal resetting in
the studied basement of the Cauvery Basin. Further, the Sm–Nd systematics yielded two groups of model
ages (2.1–3.4 Ga and 1.5 Ga), based on which two distinct crustal domains have been identified in the
basement,
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