A Grenvillian magmatic almandine garnet-bearing ferroan granite intrusion in the Chhotanagpur Gneissic complex, Eastern India: Petrology, petrochemistry, petrogenesis and geodynamic implications

Discovery of Early Tonian Calc‐alkaline and Shoshonitic Metamafic Rocks from the North Purulia Shear Zone, Chhotanagpur Gneissic Complex, Eastern India: Implications of Proterozoic Sub‐continental Lithospheric Mantle

“…The post-collisional porphyritic granitoid emplaced in the NPSZ is 998 ± 10 Ma old. Das et al (2020) have recently demonstrated that garnet-bearing ferroan porphyritic granite pluton from the present area was emplaced along the NPSZ at around 980 Ma ago. The garnets of the Tilabani pluton are of primary magmatic origin and show partial dissolution, coronae and symplectic textures.…”

“…The early Tonian mafic and felsic magmatism in the study area occurred along extensional shear zones of the North Purulia Shear Zone, implying that tectonic structures controlled the emplacement and elongated lenticular shape of the plutons Bhattacharyya, 2010, 2014;Das et al, 2020;Roy et al, 2021). The foliated granite plutons following the foliation of the shear zone indicate that granite emplacement was coeval with shearing (Goswami and Bhattacharyya, 2014;Goswami et al, 2018;Das et al, 2020). Moreover, the mafic granulites were metamorphosed and uplifted within 990-950 Ma (Karmakar et al, 2011).…”

“…1c). Porphyritic granite and garnetiferous porphyritic granite crosscut the migmatitic gneissic country rocks (Das et al, 2020). Conformable bands of mafic granulites occur within the migmatitic gneisses towards the northern side.…”

“…Granulitic rocks occur in the eastern parts of the NPSZ. Several E-W trending plutons of porphyritic granitoids syn-kinematically intrude along the NPSZ, while the shear zone accommodated the pathways for the fast upward movement of the magma (Basak et al, 2019;Das et al, 2020). Moreover, peralkaline granites, nepheline syenite and carbonatite were emplaced along the NPSZ (Goswami and Bhattacharyya, 2010;Basak and Goswami, 2020).…”

Petrogenesis of the Chaihulanzi Gneiss and its Tectonic Implications for the North China Craton

“…1). Petrogenesis of the Precambrian rocks is crucial for understanding the geological evolution of the early Earth, which is often masked by later deformation and metamorphism (Hoffmann et al, 2020;Das et al, 2020). In past decades, revisiting certain Precambrian terranes has led to new insights into their geodynamic evolution and crustal growth (e.g., Liu et al, 1999b;Xie et al, 2019;Dong et al, 2020;He et al, 2020He et al, , 2021Zhao et al, 2021).…”