Origin of post-collisional A-type granites in the Mahakoshal Supracrustal Belt, Central Indian Tectonic Zone, India: Zircon U-Pb ages and geochemical evidences

Metamorphic evolution of the pelitic and mafic granulites from Daltonganj, Chhotanagpur Granite Gneiss Complex, India: Constraints from zircon U–Pb age and phase equilibria modelling

“…It is considered that the oldest basement of CGGC came into existence during the Palaeoproterozoic period in ~1,750-1,660 Ma (Chatterjee & Ghose, 2011;Saikia et al, 2017). This same age has been recorded from the MSB, indicating that the granites from the northern portion of CGGC were an extension of the MSB (Chatterjee & Ghose, 2011;Yadav, Ahmad, Kaulina, Bayanova, & Bhutani, 2020). The protolith of metapelites rocks was obtained from adjacent continental masses, which belonged to the Eastern Ghats Belt, the Aravalli Craton, and the Lesser Himalayas of ~1,900 to 1,700 Ma (Dey et al, 2017;Rekha et al, 2011); further deposited sediments experienced the first metamorphic event M 1 during ~1,680-1,580 Ma, in which the garnet + plagioclase + K-feldspar + quartz + sillimanite + ferrian-ilmenite mineral assemblages occurred under high-temperature (>850 C) condition (Dey et al, 2020).…”

“…The Zr versus Nb/Zr diagram (Figure 9b) indicates that the protolith of pelitic granulites was encountered a subduction‐related tectonic setting (Thieblemont & Tegyey, 1994). Similar tectonic affinity has been demarcated for granites from the Gaya region of the Mahakossal Supracrustal Belt (MSB) (Yadav et al, 2020; Yadav, Wanjari, Ahmad, & Chaturvedi, 2016); it has provided consolidated evidence for the protolith of pelitic granulites derived from the MSB. The positive anomaly of Pb and negative Nb anomaly have supported the collisional tectonic setting.…”

“…The emplacement of mafic magma in the study area was recorded during ~1,629 Ma, providing solidary evidence of subduction tectonism. Instead of this, another magmatic eruption was reported in a nearby region on the northern extent of CGGC (1,690 Ma: Chatterjee & Ghose, 2011), and substantial magmatic emplacement was recorded in the Mahakoshal Belt (~1,700 Ma: Deshmukh, Prabhakar, Bhattacharya, & Madhavan, 2017; Yadav et al, 2020). Before the age of ~1,638 Ma, the rift basin was formed, and the oceanic environment developed; moreover, a variety of sediments were deposited in this oceanic basin and further HP/MT pelitic granulites evolved during ~1,629 Ma; it was due to the subduction of the oceanic lithosphere.…”

“…Cartoon diagram showing the stages of (a) the protolith of pelitic granulites and deposition of sediments, (b) M 1 stage of metamorphism of pelitic granulite, which is present as patches and simultaneous mafic magma intruded as the protolith of mafic granulite within the granitic gneisses of CGGC. CGGC, Chhotanagpur Granite Gneiss Complex; DOB, Dalma Ophiolite Belt; MGB, Makrohar Granulite Belt; SNNF, Son Narmada North Fault; SNSF, Son Narmada South Fault (modified after Mukherjee, Dey, Sanyal, & Sengupta, 2018; Yadav et al, 2020)…”

Geochronology and geochemistry of granites from the Hengjian area, Qinling Orogenic Belt: Implications for the Late Palaeozoic tectonic evolution of the North Qinling Terrane, China

“…They have been known to occur throughout the geological history of the Earth and are reported from various tectonic settings including subduction, continent-continent collision, continental rift, and post-collisional environments (Chen et al, 2004;Li, Cheng, Santosh, & Pirajno, 2015;Lu, 2000;Lu et al, 2003;Wang et al, 2009;Wang, Wang, & Zhang, 2015;Wang, Wang, Zhang, Pei, & Zhang, 2003;Wu & Zheng, 2013;Zhang, Zhang, Li, & Lu, 2013). They can also develop in ophiolite complexes at mid-oceanic ridges (Frost et al, 2001;Frost & Frost, 1997;Yadav, Ahmad, Kaulina, Bayanova, & Bhutani, 2020).…”