Petrogenesis and U Pb geochronology of charnockites flanking the Pranhita Godavari rift in peninsular India-link between the Bastar and Eastern Dharwar Cratons

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“…However, in the adjoining areas dominantly dykes and sills are present in the basement rock -Amgaon and Tirodi gneiss [11,38,55,56]. On the basis of our field observations from the Bastar Craton and those from the other parts of the world, we conclude that because of deep erosion all the evidence of supracrustal rocks including the volcanics are gone and only dykes-sills and dyke swarms acted as plumbing system for the emplacement and eruption of mantle derived melts [46,87,88]. As the temperature of the early earth was much higher, there could have been enormous lava flows on the surface of the early earth, equivalent of Mesozoic Large Igneous Plutons (LIPs) but they are not preserved and their presence is indicated by the dykes, dyke swarms, sills and other mafic plutonic bodies which are exposed because of deep erosion and exposure of plutonic bodies and basement gneisses [9,62,89,90].…”

“…Supracrustal sequences of Bastar Craton are preserved in Sausar, Dongargarh, Sakoli, Khairagarh and Mahakoshal Supergroup, comprising sequences of metavolcanic and metasedimentary rocks [28,[38][39][40]. Granulites from Balaghat-Bhandara and Ramakona-Katangi Ganulite belts associated with Central Indian Suture (CIS) zone [41,28] and Bhopalpatnam and Karimnagar granulite belts are exposed in Western Bastar [36,[42][43][44][45][46]. Mafic dyke swarms of Bastar Craton include NWSE trending Keshkal swarm, Bhanupratappur swarm, Dantewara swarm, and Bastanar swarm, NNW-SSE trending Sonakhan swarm, N-S trending Lakhna dykes, ENE-WSW trending Bandimal dykes are well studied [11,22,42,[47][48][49][50][51][52][53][54][55][56][57].…”