Restoration of Late Neoarchean–Early Cambrian tectonics in the Rengali orogen and its environs (eastern India): The Antarctic connection

Bhattacharya, Atreyee; Das, Haimabati; Bell, Elizabeth A.; Chatterjee, Nilanjan; Saha, Laxman; Dutt, Amrita

doi:10.1016/j.lithos.2016.06.006

Cited by 40 publications

(39 citation statements)

References 118 publications

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“…In a recent study, Bhattacharya et al (2016) In addition to this, leucogranite with emplacement ages 2804±3 Ma and 2811±3 Ma are also reported from the eastern part of Rengali Province (Misra et al, 2000). All these evidences converge towards the development of a convergent setting at the southern margin of the Singhbhum Craton during the time frame ca.…”

Section: Possible Tectonic Settingsupporting

confidence: 57%

“…Petrological, structural and geochronological data from this province suggest its evolution through episodic orogenic pulses since the Neoarchean time (Crowe et al, 2001(Crowe et al, , 2003Mahapatro et al, 2012;Bose et al, 2016;Bhattacharya et al, 2016). This study is primarily focused on the central part of the Rengali Province (Fig.…”

Section: Geological Backgroundmentioning

confidence: 99%

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Petrological and geochemical evolution of the Central Gneissic Belt, Rengali Province, eastern India: Implications for the Neoarchean growth and orogenesis

Dasgupta

Bose

Das

et al. 2017

Journal of Asian Earth Sciences

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Section: Possible Tectonic Settingsupporting

confidence: 57%

Section: Geological Backgroundmentioning

confidence: 99%

Petrological and geochemical evolution of the Central Gneissic Belt, Rengali Province, eastern India: Implications for the Neoarchean growth and orogenesis

Dasgupta

Bose

Das

et al. 2017

Journal of Asian Earth Sciences

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“…The major tectonothermal activity in the Gangpur Group is of Neoproterozoic age ( c . 1.0–0.96 Ga; Bhattacharya et al., ; Chowdhury & Lentz, ). The Upper Bonai/Darjing Group overlies the Iron Ore Group and the Bonai Granite of the Singhbhum craton.…”

Section: Regional Geological Settingmentioning

confidence: 99%

“…Naik and Naik () suggested that the Gangpur sequence forms an overturned synclinorium. The overall metamorphic grade of the rocks varies from greenschist to amphibolite facies (Chowdhury, ) and geothermobarometric studies indicate peak metamorphic conditions in the range of 5–6 kbar and 500–700°C (Bhattacharya et al., ; Vishwakarma & Sengupta, ). The major tectonothermal activity in the Gangpur Group is of Neoproterozoic age ( c .…”

Section: Regional Geological Settingmentioning

confidence: 99%

“…The GSB sandwiched between the Singhbhum craton and the CGC to the west of the North Singhbhum Mobile Belt comprises greenschist to amphibolite facies quartzite, conglomerate, schist, phyllite, calcsilicate rocks, meta‐dolomite, and metavolcanic rocks intruded by basic dykes/sills and granitoids (Chowdhury, ; Kanungo & Mahalik, ; Vishwakarma & Sengupta, ). A prominent Neoproterozoic tectonothermal event in the schist belt has been dated at 1.0–0.96 Ga (Bhattacharya et al., ; Chowdhury & Lentz, ).…”

Section: Introductionmentioning

confidence: 99%

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The geological evolution of the Gangpur Schist Belt, eastern India: Constraints on the formation of the Greater Indian Landmass in the Proterozoic

Chakraborty

Upadhyay

Ranjan

et al. 2018

Journal Metamorphic Geology

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The Central Indian Tectonic Zone (CITZ) is a Proterozoic suture along which the Northern and Southern Indian Blocks are inferred to have amalgamated forming the Greater Indian Landmass. In this study, we use the metamorphic and geochronological evolution of the Gangpur Schist Belt (GSB) and neighbouring crustal units to constrain crustal accretion processes associated with the amalgamation of the Northern and Southern Indian Blocks. The GSB sandwiched between the Bonai Granite pluton of the Singhbhum craton and granite gneisses of the Chhotanagpur Gneiss Complex (CGC) links the CITZ and the North Singhbhum Mobile Belt. New zircon age data constrain the emplacement of the Bonai Granite at 3,370 ± 10 Ma, while the magmatic protoliths of the Chhotanagpur gneisses were emplaced at c. 1.65 Ga. The sediments in the southern part of the Gangpur basin were derived from the Singhbhum craton, whereas those in the northern part were derived dominantly from the CGC. Sedimentation is estimated to have taken place between c. 1.65 and c. 1.45 Ga. The Upper Bonai/Darjing Group rocks of the basin underwent major metamorphic episodes at c. 1.56 and c. 1.45 Ga, while the Gangpur Group of rocks were metamorphosed at c. 1.45 and c. 0.97 Ga. Based on thermobarometric studies and zircon–monazite geochronology, we infer that the geological history of the GSB is similar to that of the North Singhbhum Mobile Belt with the Upper Bonai/Darjing and the Gangpur Groups being the westward extensions of the southern and northern domains of the North Singhbhum Mobile Belt respectively. We propose a three‐stage model of crustal accretion across the Singhbhum craton—GSB/North Singhbhum Mobile Belt—CGC contact. The magmatic protoliths of the Chhotanagpur Gneisses were emplaced at c. 1.65 Ga in an arc setting. The earliest accretion event at c. 1.56 Ga involved northward subduction and amalgamation of the Upper Bonai Group with the Singhbhum craton followed by accretion of the Gangpur Group with the Singhbhum craton–Upper Bonai Group composite at c. 1.45 Ga. Finally, continent–continent collision at c. 0.96 Ga led to the accretion of the CGC with the Singhbhum craton–Upper Bonai Group–Gangpur Group crustal units, synchronous with emplacement of pegmatitic granites. The geological events recorded in the GSB and other units of the CITZ only partially overlap with those in the Trans North China Orogen and the Capricorn Orogen of Western Australia, indicating that these suture zones are not correlatable.

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Significance and dynamics of the Neoproterozoic (810 Ma) Phulad Shear Zone, Rajasthan, NW India

et al. 2017

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The Phulad Shear Zone (PSZ) in northwestern India demarcates the boundary between Grenvillian age para‐metamorphics of the South Delhi Fold Belt (SDFB) to the east and variably deformed Neoproterozoic granitoids of the Marwar Craton to the west. In calcareous and quartzofeldspathic mylonites in and around Phulad, the shear zone is characterized by steep SE dipping mylonitic fabric and a steep oblique stretching lineation. The shear zone is developed in a ductile regime with top‐to‐the‐west reverse sense of movement coupled with pronounced flattening across the PSZ. MnNCKFMASH pressure‐temperature pseudosection analysis of closely spaced specimens of garnet‐bearing mica schists reveals that the stabilization of syn/post‐garnet porphyroblasts in the hanging wall experienced near‐isothermal decompression followed by cooling in the retrograde arm of a clockwise P‐T path. The retrieved P‐T paths are consistent with reverse motion of SDFB mica schist over the cratonic foreland. U‐Th‐Pb (total) monazite age determinations in hanging wall mica schists indicate that reverse motion on the PSZ occurred at 810 ± 6 Ma. The pre‐shearing Grenvillian age (~970 ± 9 Ma) metamorphic monazites of the SDFB occur as embayed cores, in the interiors of younger monazite grains. Intense high‐temperature deformation and the emplacement of mica‐bearing pegmatites during reverse shearing caused recrystallization of monazites by dissolution‐precipitation, mantling older monazites in the hanging wall SDFB schists. It is suggested that the PSZ may represent a terrane boundary shear zone along which the Greater India landmass accreted with the Marwar Craton at ~810 Ma.

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Restoration of Late Neoarchean–Early Cambrian tectonics in the Rengali orogen and its environs (eastern India): The Antarctic connection

Cited by 40 publications

References 118 publications

Petrological and geochemical evolution of the Central Gneissic Belt, Rengali Province, eastern India: Implications for the Neoarchean growth and orogenesis

Petrological and geochemical evolution of the Central Gneissic Belt, Rengali Province, eastern India: Implications for the Neoarchean growth and orogenesis

The geological evolution of the Gangpur Schist Belt, eastern India: Constraints on the formation of the Greater Indian Landmass in the Proterozoic

Significance and dynamics of the Neoproterozoic (810 Ma) Phulad Shear Zone, Rajasthan, NW India

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