Rajib Kar

Research Field

Arenite

Terrigenous sediment

Siltstone

Pillow lava

Pelagic sediment

10.1016/j.gr.2017.04.032

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Citations (13)

High-temperature crustal anatexis in a clockwise P – T – t path: isotopic evidence from a granulite–granitoid suite in the Eastern Ghats belt, India

Journal of the Geological Society (2003)

S. Bhattacharya Rajib Kar Wilson Teixeira Miguel Ângelo Stipp Basei

The high-grade metamorphic belt of the Eastern Ghats, India, displays polyphase deformation structures, a complex metamorphic record and dehydration melting in different crustal protoliths. High-temperature melting in pelitic and greywacke-like precursors in a clockwise P – T path, decompression and subsequent isobaric cooling have recently been described from the south–central sector of this belt. In this contribution, high-temperature melting has been dated at c . 1162 Ma by Sm–Nd whole-rock isotopic compositions of granitoids. Subsequent isobaric cooling could have occurred between 988 and 900 Ma as indicated by U–Pb ages of zircon and monazite in pelitic granulites. Thus, a prolonged orogenic cycle of at least 250 Ma is envisaged. Additionally, isotopic disequilibrium between whole rock and minerals in sapphirine granulites could have resulted from rapid melting and been further enhanced by a prolonged reaction history of the sapphirine granulite.

Anatexis

Pelite

Protolith

Charnockite

Sillimanite

10.1144/0016-764902-063

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Citations (33)

Zircon U-Pb geochronology and Hf isotopes from granulites and gneisses from Kabbaldurga, in the Dharwar Craton, South India: Implications for Mesoarchean magmatic charnockite in the crustal evolutionary trajectory

Episodes (2024)

Samarendra Bhattacharya Miguel Ângelo Stipp Basei Rajib Kar Mathias Hueck Sanchari Chatterjee

Geochronology

Dharwar Craton

Charnockite

10.18814/epiiugs/2024/024006

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Citations (0)

Petrogenesis of granitoid rocks at the northern margin of the Eastern Ghats Mobile Belt and evidence of syn-collisional magmatism

Journal of Earth System Science (2004)

S. Bhattacharya Rajib Kar S. Moitra

Petrogenesis

Protolith

10.1007/bf02704022

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Citations (2)

Petrological and Geochemical Constraints on the Evolution of the Alkaline Complex of Koraput in the Eastern Ghats Granulite Belt, India

Gondwana Research (2005)

S. Bhattacharya Rajib Kar

Felsic

Alkali feldspar

10.1016/s1342-937x(05)71160-6

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Citations (9)

Geochronological Constraints for Boundary Shear Zones between Eastern Ghats Province and Bastar Craton: Implication for the Formation of Granulites and Their Exhumation History

International Journal of Geosciences (2022)

Rajib Kar Miguel Ângelo Stipp Basei Samarendra Bhattacharya Anwesha Ghosh Sanchari Chatterjee

Shear zones in the boundary between Eastern Ghats Province (EGP) and the cratons of Singhbhum in the north and Bastar in the west provide an excellent opportunity to study the tectonics of shear zone development and its timing in relation to the evolutionary history of the granulite suites. Detailed structural, microfabric and quartz C-axis patterns revealed a high temperature shear zone, at the western boundary between EGP and Bastar Craton (BC) around Paikmal. Petrological studies in this shear zone indicated decompression coeval with stretching in the sheared granulites. Geochronological constraints provided here indicate rapid exhumation of deep seated granulites in this boundary shear zone; the timing also is late in relation to the long-lived thermal (granulite formation) event in the EGP. Additionally, our geochronological data demonstrated the ~1600 Ma event in the Eastern Ghats Belt (EGB) involving sedimentation, magmatism, metamorphism and crustal anatexis, as a significant world event.

Anatexis

10.4236/ijg.2022.138032

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Citations (1)

Unraveling the pre-metamorphic cooling history of the Koraput Alkaline Complex, India: constraints from feldspar exsolution texture

Mineralogy and Petrology (2022)

Manojit Koley Biswajit Ghosh Debaditya Bandyopadhyay Sankhadeep Roy Archisman Dhar

Orthoclase

Alkali feldspar

Sanidine

Microcline

10.1007/s00710-022-00795-x