Detrital zircon U–Pb LA‐ICPMS ages from the Kolhan Group, Singhbhum Craton, eastern India: Implications for terminal Mesoproterozoic palaeogeography between Columbia and Rodinia along the Central Indian Tectonic Zone

Abstract

The Kolhan Group in the Singhbhum Craton of eastern India is a passive margin siliciclastic shelf to deep‐water carbonate ramp platform succession. It occupies a unique position in respect of the Central Indian Tectonic Zone (CITZ), widely considered as the suture joining the northern and southern Indian cratonic blocks at the time of amalgamation of the Mesoproterozoic supercontinent Columbia. The Kolhan succession is closely comparable to other Late Proterozoic ‘Purana’ successions of India including the siliciclastic‐carbonate Suasar Group from the central part of the CITZ. We report here the first U–Pb detrital zircon ages from the Kolhan Group. The youngest age population obtained from basal siliciclastics suggests it is not older than ca. 1,158 Ma. The absence of any concordant detrital zircon <1,000 Ma which is well represented in the adjoining Singhbhum Shear Zone and CITZ extensions, suggests that the sedimentation took place prior to ca. 1,000 Ma. The Kolhan Group, therefore, records an extensional event between two major episodes of supercontinent assembly (i.e., Columbia and Rodinia). A similar motif of extension and passive margin sedimentation across Mesoproterozoic Peninsular India together with the widespread Mesoproterozoic lamproite and kimberlite emplacement event suggests an episode of extension and major basin development across the Indian Shield in between the two supercontinent amalgamation cycles of Columbia and Rodinia.

Crustal architecture of North Singhbhum Mobile Belt, Eastern Indian Shield: Constraints from two‐dimensional and three‐dimensional modelling of Bouguer gravity and aeromagnetic data

“…1.71–1.63 Ga arc‐related felsic magmatism in the northern part of CGGC (Dey et al, 2017; Mukherjee et al, 2019). These observations suggest a temporal correspondence between the Mahakoshal belt and NSMB during the early phase of basin formation (Mukhopadhyay et al, 2020; Olierook et al, 2019). Recent studies in the CITZ (Bhowmik, 2019; Bhowmik et al, 2012; Bhowmik & Chakraborty, 2017) interpreted the ca.…”

“…On the other hand, the structural grain and E‐W gradient in the Bouguer gravity (Figure 4) and aeromagnetic anomalies (Figure 5) of NSMB and CGGC show a concordant relationship with the structural trend of the CITZ, indicating the tectonic connection between them. Based on the magmatic and metamorphic events related to the late Paleoproterozoic‐Mesoproterozoic period, several earlier workers also offer a coherent tectonic evolution history between CITZ and its adjacent NSMB and CGGC (Acharyya, 2003; Bhowmik, 2019; Bhowmik, Wilde, Bhandari, Pal, & Pant, 2012; Chakraborty, Upadhyay, Ranjan, Pruseth, & Nanda, 2019; Mukhopadhyay, Crowley, Ghosh, Ghosh, & Heron, 2020). Considering the possible spatial relation between the CITZ and this region, the results obtained from this study are integrated with the earlier knowledge on magmatism and metamorphism for suggesting a comprehensive tectonic model for NSMB.…”

High-latitude platform carbonate deposition constitutes a climate conundrum at the terminal Mesoproterozoic

“…1180 Ma provides a minimum constraint for the Purana platform in the Pranhita-Godavari Basin 2 . Detrital zircon ages of 1158 ± 11 Ma from the Kolhan Group (on the Singhbhum Craton) suggest that it, too, is likely coeval with similar facies in the Pranhita–Godavari Basin 11 (Fig. 2b ).…”

“… A Paleoenvironmental reconstruction of the Purana platform based on Mukhopadhyay et al 11 and Gutzmer and Beukes 58 . B Correlation of Sequence III across southern India with age constraints and paleomagnetic sampling positions (Modified from Wabo et al 3 ).…”