Proterozoic polyphase metamorphism in the Chhotanagpur Gneissic Complex (India), and implication for trans-continental Gondwanaland correlation

Maji, Avijit; Goon, S.; Bhattacharya, Atreyee; Mishra, Biswajit; Mahato, Souradeep; Bernhardt, Heinz-J.

doi:10.1016/j.precamres.2007.10.002

Cited by 105 publications

(80 citation statements)

References 44 publications

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“…Although the metamorphic P-T path for this granulite event is not known at present, an intermediate-P, high-T (P$4-6 kbar, 750-8508C) nature of this event was deduced in the Saltora-Bero area, at the southern margin of the CGC (Maji et al, 2008). These granulites were subsequently intruded by the Bengal anorthosites (Maji et al, 2008), for which an emplacement age of $1.55 Ga was determined, based on U-Pb zircon dating, applying isotope dilution thermal ionization mass spectrometry (ID-TIMS) technique (Chatterjee et al, 2008). The date provides a minimum age for the granulite metamorphism in the CGC (Chatterjee et al, 2008;Mahato et al, 2008).…”

Section: Discussionmentioning

confidence: 93%

“…The CGC is a high-grade granulite-gneiss domain, where granulite facies litho-associations of metapelites-calc silicates-metabasites and metaanorthosites occur as enclaves of different dimensions within gneiss-migmatites and intrusive granitoids (Figure 8a; see Acharyya, 2003 for a summary). Recent petrological, structural and geochronological studies reveal a polyphase metamorphic evolution in the CGC (Chatterjee et al, 2008;Maji et al, 2008). The earliest record of prograde granulite metamorphism is recorded in the granulite enclaves by the stability of scapolite þ wollastonite in the calc silicates, garnet þ sillimanite þ K-feldspar þ biotite þ ilmenite þ rutile AE green spinel in the metapelites, orthopyroxene þ plagioclase þ clinopyroxene þ ilmenite AE hornblende in the mafic granulites, garnet AE orthopyroxene þ plagioclase þ K-feldspar þ biotite AE hornblende in the migmatitic quartzo-feldspathic gneisses (Sen and Bhattacharya, 1993;Maji et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

“…Recent petrological, structural and geochronological studies reveal a polyphase metamorphic evolution in the CGC (Chatterjee et al, 2008;Maji et al, 2008). The earliest record of prograde granulite metamorphism is recorded in the granulite enclaves by the stability of scapolite þ wollastonite in the calc silicates, garnet þ sillimanite þ K-feldspar þ biotite þ ilmenite þ rutile AE green spinel in the metapelites, orthopyroxene þ plagioclase þ clinopyroxene þ ilmenite AE hornblende in the mafic granulites, garnet AE orthopyroxene þ plagioclase þ K-feldspar þ biotite AE hornblende in the migmatitic quartzo-feldspathic gneisses (Sen and Bhattacharya, 1993;Maji et al, 2008). Although the metamorphic P-T path for this granulite event is not known at present, an intermediate-P, high-T (P$4-6 kbar, 750-8508C) nature of this event was deduced in the Saltora-Bero area, at the southern margin of the CGC (Maji et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

“…The earliest record of prograde granulite metamorphism is recorded in the granulite enclaves by the stability of scapolite þ wollastonite in the calc silicates, garnet þ sillimanite þ K-feldspar þ biotite þ ilmenite þ rutile AE green spinel in the metapelites, orthopyroxene þ plagioclase þ clinopyroxene þ ilmenite AE hornblende in the mafic granulites, garnet AE orthopyroxene þ plagioclase þ K-feldspar þ biotite AE hornblende in the migmatitic quartzo-feldspathic gneisses (Sen and Bhattacharya, 1993;Maji et al, 2008). Although the metamorphic P-T path for this granulite event is not known at present, an intermediate-P, high-T (P$4-6 kbar, 750-8508C) nature of this event was deduced in the Saltora-Bero area, at the southern margin of the CGC (Maji et al, 2008). These granulites were subsequently intruded by the Bengal anorthosites (Maji et al, 2008), for which an emplacement age of $1.55 Ga was determined, based on U-Pb zircon dating, applying isotope dilution thermal ionization mass spectrometry (ID-TIMS) technique (Chatterjee et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

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∼1.6 Ga ultrahigh‐temperature granulite metamorphism in the Central Indian Tectonic Zone: insights from metamorphic reaction history, geothermobarometry and monazite chemical ages

et al. 2011

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In this study, we present precise pressure-temperature (P-T) and age constraints of ultrahigh-temperature (UHT) metamorphism of the Bhandara-Balaghat granulite (BBG) domain at the southern margin of the Central Indian Tectonic Zone (CITZ). Supracrustal and metaigneous granulites of this domain, which lie as detached pods and lenses of various sizes within felsic gneiss-migmatite association record protracted high-T crustal anatexis events, broadly synchronous with and/or punctuated with felsic and mafic plutonism. Magnesian metagreywacke protolith of the supracrustal suite records extensive biotite melting and subsequent melt extractions at deep crustal, UHT metamorphic conditions (T ! $9008C at P$8 kbar), producing restitic mineral assemblages of garnet þ rutile, garnet þ cordierite and garnet þ aluminous orthopyroxene. The diversity of the mineral assemblages is related to the domainal-scale variation of the bulk rock composition. In situ chemical age dating of five monazite grains, which occur in the different textural settings of the garnet þ cordierite þ orthopyroxene þ rutile-bearing granulite reveals two age domains: (1) Pervasive $1.6 Ga domain, which is recorded in monazites occurring as inclusions in garnet and in the leucosome matrix is correlated with the timing of the UHT metamorphism. (2) $1.47 Ga domain reflects a fluid-mediated recrystallization event leading to dissolution and re-precipitation of older monazite. The $1.6 Ga monazite chemical ages provide robust constraints on the timing of the earliest stage of tectonothermal processes in the CITZ (defined here as the 'Central Indian Orogeny'). The significance of the $1.6 Ga hot orogenesis in interorogen correlation is discussed.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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∼1.6 Ga ultrahigh‐temperature granulite metamorphism in the Central Indian Tectonic Zone: insights from metamorphic reaction history, geothermobarometry and monazite chemical ages

et al. 2011

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“…Sen & Battacharya (1993) opine that a garnet-forming reaction is triggered during retrograde metamorphism as a consequence of near-isobaric cooling (IBC-path). On the other hand, Maji et al (2008) advocate a prograde growth of garnet at the expense of plagioclase + ilmenite ± biotite ± hornblende ± quartz.…”

Section: Discussionmentioning

confidence: 99%

Petrography and geochemistry of the Pedra Dourada Granulite, southeastern Minas Gerais, Brazil

2016

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The Pedra Dourada Granulite (PDG) occurs at the southeastern portion of the Araçuaí Belt, north of the town of Ponte Nova. It comprises bodies up to 45 km 2 inserted into amphibolite-facies gneisses of the Mantiqueira Complex. Motivated by the discrepancy of metamorphic grade with surrounding rocks, this paper presents results of the petrographic and geochemical investigation of the PDG. The unit is comprised of meta-igneous and metasedimentary rocks. Meta-igneous rocks dominate and include felsic granulites (biotite ± garnet-bearing and orthopyroxene-bearing) and subordinate mafic granulites. Metasedimentary rocks are aluminous granulites with Al-rich mineral assemblages (garnet, sillimanite, spinel). Geochemical data show that most of felsic protoliths are peraluminous rocks including granites, granodiorites and diorites of calc-alkaline character, chemically similar to granitoids of convergent tectonic settings. Mafic protoliths are metaluminous rocks comprised of gabbros and subordinate diorites of tholeiitic affinity, compositionally similar to plate margin basalts. Aluminous protoliths may be peraluminous pelitic rocks and wackes, analogous to sediments from convergent environments. The mineral assemblages indicate that these rocks were metamorphosed under medium-P granulite-facies conditions. Coronitic garnet textures suggest a near-isobaric cooling (IBC-path) after metamorphic peak.

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How far does a ductile shear zone permit transpression?

Dasgupta

Mandal

Bose

2015

Ductile Shear Zones

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Proterozoic polyphase metamorphism in the Chhotanagpur Gneissic Complex (India), and implication for trans-continental Gondwanaland correlation

Cited by 105 publications

References 44 publications

∼1.6 Ga ultrahigh‐temperature granulite metamorphism in the Central Indian Tectonic Zone: insights from metamorphic reaction history, geothermobarometry and monazite chemical ages

∼1.6 Ga ultrahigh‐temperature granulite metamorphism in the Central Indian Tectonic Zone: insights from metamorphic reaction history, geothermobarometry and monazite chemical ages

Petrography and geochemistry of the Pedra Dourada Granulite, southeastern Minas Gerais, Brazil

How far does a ductile shear zone permit transpression?

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