Comparative petrogenesis and tectonics of Paleoproterozoic Malanjkhand and Dongargarh granitoids, Central India

Chapter 11 Palaeoproterozoic supracrustals of the Bastar Craton: Dongargarh Supergroup and Sausar Group

“…Geochemical data (major, trace and REE) indicate the volcanics of the Nandgaon Group to be of alkaline affinity formed under stable crustal conditions by midcrustal anatexis (Divakara Rao et al 2000a). Geochemical discrimination indicates that the Malanjkhand granite is an I-type (Pandit & Panigrahi 2012). The Dongargarh batholith has two different components: a coarse, equigranular granite and the porphyritic granodiorite.…”

Magma chamber processes and geodynamic implications of the Pithora pluton, Bastar Craton, Central India

“…In plutonic environment, the homogenisation and heterogenisation features are well-documented in the form of ME, syn-plutonic mafic dyke, hybrid enclaves, and flow structures. These features are reported from different parts of the Bastar Craton Pal, 2004a and2004b;Kumar & Rino, 2006;Pandit & Panigrahi, 2012;Elangovan, Krishna, Vishwakarma, Hari, & Ram Mohan, 2017). MEs are also reported in postcollisional granitoids from Mahakoshal belt (Bora, Kumar, Yi, Kim, & Lee, 2013) and related to Pan-African Orogeny in south Khasi Hills of Meghalaya Plateau (Kumar & Pieru, 2010;Kumar, Pieru, Rino, & Hayasaka, 2017;Kumar, Pieru, Rino, & Lyngdoh, 2005).…”

“…The geochemical studies on host granites and petrological studies on corresponding MEs from the Malanjkhand are suggestive of the mixing of coeval felsic and mafic magmas derived in a subduction setting (Kumar & Rino, ). In another study, based on the geochemical systematics, the origin of Malanjkhand and Dongargarh granitoids are related to the mixing of mafic and felsic components, however the source for the mafic magma is attributed to the basaltic underplating in a continental rift environment (Pandit & Panigrahi, ). Petrogenetic studies on the gneisses and granites from the central part of Bastar Craton prompted to propose the subduction environment for the emplacement of the granites and gneisses (Hussain et al, ).…”

“…These features are reported from different parts of the Bastar Craton (Kumar, Rino, & Pal, and 2004b; Kumar & Rino, ; Pandit & Panigrahi, ; Elangovan, Krishna, Vishwakarma, Hari, & Ram Mohan, ). MEs are also reported in postcollisional granitoids from Mahakoshal belt (Bora, Kumar, Yi, Kim, & Lee, ) and related to Pan‐African Orogeny in south Khasi Hills of Meghalaya Plateau (Kumar & Pieru, ; Kumar, Pieru, Rino, & Hayasaka, ; Kumar, Pieru, Rino, & Lyngdoh, ).…”

“…Dongargarh granite has emplaced within the Kotri-Dongargarh orogeny in central part of the Bastar Craton, whereas the Malanjkhand and Kanker granitoids comprise the rest of Bastar Craton (Figure 1 and Ramakrishnan & Vaidyanadhan, 2008). The available petrogenetic studies on the granitoids of Bastar Craton are noncohesive, with variable tectonic models ranging from continental rift setting to volcanic arc environments (Hussain, Mondal, & Ahmad, 2004;Manikyamba et al, 2016;Narayana, Rao, Rao, Murthy, & Rao, 2000;Pandit & Panigrahi, 2012). The geochemical studies on host granites and petrological studies on corresponding MEs from the Malanjkhand are suggestive of the mixing of coeval felsic and mafic magmas derived in a subduction setting (Kumar & Rino, 2006).…”