Reassembly of the Dharwar and Bastar cratons at ca. 1 Ga: Evidence from multiple tectonothermal events along the Karimnagar granulite belt and Khammam schist belt, southern India

Joy, Sojen; Linde, Gert van der; Choudhury, Asru K; Deb, Gautam Kumar; Tappe, Sebastian

doi:10.1007/s12040-018-0988-2

Cited by 12 publications

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References 77 publications

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“…The basin formation and sedimentation in the PG Valley and Chhattisgarh basins developed later in the Mesoproterozoic (~1,600 Ma) and continued intermittently to Neoproterozoic times (Saha et al, ). Amalgamation of Peninsular India with the formation of the Rodinia supercontinent towards the end of the Mesoproterozoic is evidenced in the PG Valley and Chhattisgarh Basin areas (Joy, van der Linde, Choudhury, Deb, & Tappe, ; Merdith et al, ).…”

Section: Discussionmentioning

confidence: 99%

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Depositional history and provenance of cratonic “Purana” basins in southern India: A multipronged geochronology approach to the Proterozoic Kaladgi and Bhima basins

et al. 2018

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Peninsular India is a collage of Archaean cratonic domains separated by Proterozoic mobile belts. A number of cratonic basins, known as “Purana basins” in the Indian literature, formed in different parts of the Indian Peninsula during extensional tectonic events, from Paleoproterozoic through Neoproterozoic times. In this contribution, we present a diversity of new geochronological data for different units within the Kaladgi and the Bhima basins, which overlie the western and eastern Dharwar cratons, respectively. The new geochronology data are discussed in terms of depositional history and provenance of these poorly understood Proterozoic intracratonic basins. For the Kaladgi Group, a U–Pb baddeleyite age of 1,861 ± 4 Ma obtained for a dolerite dyke intruding the Yendigere Formation is used to constrain the minimum age of deposition of the lower Kaladgi Group. This result demonstrates that this part of the succession is comparable in age to the Papaghni Group of the Cuddapah Basin, heralding onset of Purana sedimentation at ~1,900 Ma. The detrital zircon populations from the clastic rocks of the Kaladgi and Bhima basins show unique and distinct age patterns indicating different source of sediments for these two basins. Palaeocurrent analysis indicates a change in provenance from south or southeast to west or northwest between the Kaladgi and Bhima clastic sedimentation. New U–Th–Pb and Rb–Sr radiometric dates of limestones and glauconite‐bearing sandstones of the Bhima Group (Bhima Basin) and the Badami Group (Kaladgi Basin) indicate deposition at around 800–900 Ma, suggesting contemporaneity for the two successions. Thus, the unconformity between the Kaladgi Group and the overlying Badami Group represents a time gap of up to 1,000 Myr. These new results demonstrate the complex multistage burial and unroofing history of the Archaean Dharwar Craton throughout the Proterozoic, with important implications for exploration of metal deposits and diamonds in Peninsular India.

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Section: Discussionmentioning

confidence: 99%

“…Data shown are for acid leachates (low Rb/Sr) and complementary residues (high Rb/Sr) for six separates (four from EHV956, two from EHV957). The data define pooled isochrons in the range of 797-812 Ma [Colour figure can be viewed at wileyonlinelibrary.com] areas (Joy, van der Linde, Choudhury, Deb, & Tappe, 2018;Merdith et al, 2017).…”

Section: Figure 18mentioning

confidence: 99%