Long Hiatus in Proterozoic Sedimentation in India: Vindhyan, Cuddapah and Pakhal Basins - A Plate Tectonic Model

Abstract

Most of the Proterozoic basins in India, viz. the Vindhyan, the Cuddapah and the Pakhal Basins have experienced long hiatus between the upper and the lower group of rocks. It is proposed that the older group of rocks of Paleoproterozoic period (~1.9-1.6 Ga) formed during the rifting phase caused by large scale magmatism in respective basins possibly due to plume tectonics. On the other hand, the younger group of rocks of Neoproterozoic (~1.0-0.7 Ga) are formed during the final phase of convergence after mountain building that supplied sediments. These geological processes explain large scale disturbances in the older group of rocks during subsequent convergence and collision as they usually occurred along the rifted margins of the cratons. These processes also explain the undisturbed nature, devoid of magmatic rocks of the younger group of rocks and hiatus of about 0.5-0.6 Ga in each case. It is suggested that the plume that was responsible for these rifting of the Indian cratons during Paleo-Mesoproterozoic might have also been responsible for the break up of contemporary Columbian agglomeration in this section. Same model can be used to explain the formation of Proterozoic basins and related hiatus any where else where similar geological environment exist.

Interpretation of Gravity Anomaly and Crustal Thickness Mapping of Narmada-Son Lineament in Central India

“…Hence, the information available from these sources may not be realistic solutions particularly to the complex zones concerning the source depth locations and delineation of specifics fault pattern (Kaila et al, 1989;Srivastava et al, 2007;Murty et al, Singh and Meissner, 1995;Bhattacharji et al, 2004;Verma and Banerjee, 1992;Rao et al, 2004;Singh, 1998;Waghmare et al, 2009;Nageswara Rao et al, 2011;Mishra 2011). The Euler deconvolution technique carried out in this area also correlated with the results of the workers as mentioned above and discussed in the text.…”

SHRIMP geochronology for the 1450Ma Lakhna dyke swarm: Its implication for the presence of Eoarchaean crust in the Bastar Craton and 1450–517Ma depositional age for Purana basin (Khariar), Eastern Indian Peninsula – Reply

“…Rifting happens due to thermal perturbation followed by extensional tectonics which is a global scale phenomenon. Probably 1.8 and 1.4 Ga events were related to Columbia Supercontinent assembly and breakup (Mishra, 2011). As happens, the rift margin gradually migrates away from the axis; the basin-fills therefore show a variation in age.…”

“…After reading the comments by Basu and Bickford we under-stood that the debate about the closing age of Purana rocks is yet unresolved. The school advocating Neoproterozoic-Cambrian age are evenly balanced with those belonging the other school maintaining ca 1000 Ma age (Chaudhuri et al (2002), Naqvi (2005), Srivastava (2009); see for review, Malone et al, 2008;Ratre et al, 2010;Mishra, 2011). We strongly feel that the Purana basins close to the mobile belts are to be studied with special emphasis to tectonics of exhumation.…”

Evaluation of two multidimensional discrimination diagrams from beach and deep-sea sediments from the Gulf of Mexico and their application to Precambrian clastic sedimentary rocks

“…Dey et al (2009) documented the deformation and an uplift of the Bagalkot and the Badami Group sediments deposited over the denuded surface of the Bagalkot Group and Archaean Basement rocks. Mishra (2011) mentioned that the rifting phase of the Palaeoproterozoic is followed by convergence. During convergence, the Kurnool Supergroup rocks (Kaladgi and Bhima basins; Naqvi et al 1988) of the Neoproterozoic period were deposited after collision and the sediments were derived from the mountains.…”