Contribution of Columbia and Gondwana Supercontinent assembly- and growth-related magmatism in the evolution of the Meghalaya Plateau and the Mikir Hills, Northeast India: Constraints from U-Pb SHRIMP zircon geochronology and geochemistry

Characterization and metamorphic evolution of Mesoproterozoic granulites from Sonapahar (Meghalaya), NE India, using EPMA monazite dating

“…The high-grade rocks of the Eastern Ghats Mobile Belt of the Indian Plate correlated with the Napier and Rayner Province in East Antarctica during the Grenvillian orogeny (∼1.0 Ga) (Mezger & Cosca, 1999;Boger et al 2000;Fitzsimons, 2000). The Rodinia supercontinent achieved the highest strength of accretion during the Grenvillian orogeny (∼1.0 Ga), after which drifting was again started from ∼0.75 Ga, finally forming the Gondwana supercontinent during Neoproterozoic times (∼0.5 Ga) (Rogers & Santosh, 2002;Chatterjee et al 2007Chatterjee et al , 2011Li et al 2008;Yin et al 2010;Kumar et al 2017;Borah et al 2019). This orogeny experienced significant magmatism and contraction during the amalgamation of Eastern Gondwana (0.55-0.50 Ga) (Ghosh et al 2004;Collins et al 2007;Biswal et al 2007).…”

“…The EPMA monazite dating of the metapelitic granulites of the SMGC reveals predominantly Mesoproterozoic ages of 1621-1596 Ma for a post-S 1 /pre-S 2 stage of metamorphism, with poorly constrained 1141-946 Ma ages and more significant ages of 649-524 Ma, which are considered syn-S 2 and post-S 2 stages of metamorphism, respectively (Chatterjee et al 2007(Chatterjee et al , 2011Chatterjee, 2017). U-Pb zircon dating of granite gneiss basement rocks from the central SMGC yielded Neoarchaean to Neoproterozoic ages, which range from ∼2600 to ∼1100 Ma (Bidyananda & Deomurari, 2007;Kumar et al 2017). Yin et al (2010) found three stages of granite intrusion at ∼1.6 Ga, ∼1.1 Ga and ∼0.5 Ga in the central SMGC, which were revealed by the same analytical technique.…”

Tectonothermal evolution of the Central Indian Tectonic Zone and its implications for Proterozoic supercontinent assembly: the current status

“…Further east in the Shillong Plateau Gneissic Complex, ca. 1.63-1.60 Ga orogenesis produced medium-pressure granulite facies metamorphism along a CCW P-T path (Chatterjee et al, 2007) and felsic magmatism (Yin et al, 2010;Santosh Kumar et al, 2017). There is an ongoing debate on the status of ca.…”

Monazite and xenotime U–Th–Pb $$_{\mathrm{total}}$$ total ages from basement rocks of the (central) Shillong–Meghalaya Gneissic Complex, Northeast India

“…Several authors have used diverse dating methods to report different geological events (e.g., ∼2.6, 1.6, 1.0, 0.5 Ga, etc.) from stratigraphically distinct lithounits in the central and eastern part of the Shillong-Meghalaya Gneissic Complex (SMGC) (Ghosh et al 1991(Ghosh et al , 1994(Ghosh et al , 2005Bidyananda and Deomurari 2007;Chatterjee et al 2007Chatterjee et al , 2011Yin et al 2010;Kumar et al 2017). Chatterjee et al (2007Chatterjee et al ( , 2011 have reported well constrained ∼500 Ma monazite chemical ages from different localities of Sonapahar (central SMGC) metapelitic rocks suggesting it to be a part of western margin of Pan-African Prydz Bay suture of East Antarctica.…”