The Western Charnockite Zone of the Eastern Ghats Belt, India — An Independent Crustal Province of Late Archaean (2.8 Ga) and Palaeoproterozoic (1.7—1.6 Ga) Terrains

Ковач, В. П.; Simmat, Ralf; Rickers, Karen; Berezhnaya, N. G.; Сальникова, Е. Б.; Dobmeier, Christoph; Raith, M.; Yakovleva, S. Z.; Котов, А. Б.

doi:10.1016/s1342-937x(05)70462-7

Cited by 79 publications

(45 citation statements)

References 6 publications

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“…1), preserve evidence for a granulite-facies metamorphic event at w2.8 Ga (Kovach et al, 2001). Although no subsequent metamorphic imprints are identified from the Jeypore and Rengali provinces, the shear zones and fault zones forming respective boundaries with the Eastern Ghats province were reactivated during w1.1e1.0 Ga and w0.6e0.5 Ga orognesis (Crowe et al, 2001;.…”

Section: Eastern Ghats Beltmentioning

confidence: 88%

A geochemical perspective on charnockite magmatism in Peninsular India

Rajesh

2012

Geoscience Frontiers

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Large charnockite massifs occur in the high-grade Southern Granulite Terrain (SGT) and Eastern Ghats Belt (EGB) crustal provinces of Peninsular India. Available geochronological data indicate that the magmatism is episodic, associated with distinct orogenic cycles in the different crustal domains. The geochemical data also indicate a change in composition from trondhjemitic at w3.0e2.9 Ga to dominantly tonalitic at w2.6e2.5 Ga to tonalitic-granodiorite-granitic at w2.0e1.9 Ga to dominantly tonalitic at 1.7e1.6 Ga to quartz monzonitic or tonalitic at w1.0e0.9 Ga to granodiorite-granitic at w0.8e0.7 Ga. The trondhjemitic and tonalitic end members are metaluminous, magnesian and calcic to calc-alkalic, characteristic of magnesian group charnockites. The granodioritic to granitic end members are metaluminous to slightly peraluminous, ferroan and calc-alkalic to alkali-calcic, characteristic of ferroan group charnockites. The quartz monzonitic end members are metaluminous to peraluminous, magnesian to ferroan and calcic to calc-alkalic, neither characteristic of the magnesian group nor of the ferroan group of charnockites. Based on the occurrence and difference in composition of the charnockite massifs, it is suggested that the charnockite magmatism registers the crustal growth of the Indian plate on its southern (SGT) and eastern (EGB) sides, along active continental margins by accretion of arcs. ª 2012, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. All rights reserved.

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Section: Eastern Ghats Beltmentioning

confidence: 88%

A geochemical perspective on charnockite magmatism in Peninsular India

Rajesh

2012

Geoscience Frontiers

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“…1). The Archean crust was consolidated by 2.5 Ga (Sarkar et al 1993;Chadwick et al 2000;Kovach et al 2001), whereas Nd-model ages from different lithologies of the Eastern Ghats Province imply that its crust formed in Proterozoic time . Lithological similarities (Katz 1989), a similar crustal evolution (Mezger and Cosca 1999;Rickers et al 2001), and combined tectonic and petrologic studies at the contact with the Bhandara craton (Gupta et al 2000) strongly suggest that the Eastern Ghats Province and East Antarctica formed one crustal terrane that collided with proto-India during the global Grenvillian orogeny (Mezger and Cosca 1999;Gupta et al 2000).…”

Section: Geological Settingmentioning

confidence: 99%

Emplacement of Proterozoic massif-type anorthosite during regional shortening: evidence from the Bolangir anorthosite complex (Eastern Ghats Province, India)

Dobmeier

2005

Int J Earth Sci (Geol Rundsch)

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A study of the 933±32-Ma-old Bolangir massiftype anorthosite complex (Eastern Ghats Province, India) yielded strong evidence for anorthosite emplacement during regional shortening, and thereby new insights in massif-type anorthosite formation. Several lines of evidence strongly suggest synchronism of plutonism and regional deformation. First, structures in the country rocks, which imply N-S-directed shortening accompanied by E-W extension, are mirrored by a E-W trending post-magmatic foliation and N-S trending shear zones in the anorthosite complex. Near the intrusion, the foliation in the country rocks becomes parallel to the contact and an internal marginal foliation, and foliation triple points occur in the country rocks. Second, synshortening dikes inside and outside the anorthosite complex are filled with pluton-related melts. Third, ferrodiorites, which are considered late-stage differentiates of the anorthositic pluton, concentrate in tectonic voids at the pluton margin. Some of these occurrences have been affected by the last increments of the regional deformation, but others transect the same structures. Ascent mechanism and significance of the adjacent terrane boundary of the Eastern Ghats Belt for ascent and emplacement of the Bolangir anorthosite complex are discussed. The results of this study imply that emplacement of Proterozoic massif-type anorthosite is not restricted to extensional settings.

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“…The charnockite-enderbite gneisses of Jeypore are of Archaean age, 2.5 Ga reported from complexly zoned zircon (Simmat and Raith 2008). But south of Godavari graben, charnockiteenderbite gneisses record a much younger age, namely ∼ 1.6 Ga (Kovach et al 2001;Simmat and Raith 2008;Bhattacharya et al 2010). It is important to note that the Prakasam alkaline complex, representing rift-valley magmatism, occurs to the west of the Ongole domain of the Eastern Ghats granulite belt.…”

Section: Geological Settingmentioning

confidence: 99%

Mafic dykes at the southwestern margin of Eastern Ghats belt: Evidence of rifting and collision

Bhattacharya

Chaudhary

Teixeira³

2010

J Earth Syst Sci

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The southwestern margin of the Eastern Ghats Belt characteristically exposes mafic dykes intruding massif-type charnockites. Dykes of olivine basalt of alkaline composition have characteristic trace element signatures comparable with Ocean Island Basalt (OIB). Most importantly strong positive Nb anomaly and low values of Zr/Nb ratio are consistent with OIB source of the mafic dykes. K-Ar isotopic data indicate two cooling ages at 740 and 530 Ma. The Pan-African thermal event could be related to reactivation of major shear zones and represented by leuco-granite vein along minor shear bands. And 740 Ma cooling age may indicate the low grade metamorphic imprints, noted in some of the dykes. Although no intrusion age could be determined from the present dataset, it could be constrained by some age data of the host charnockite gneiss and Alkaline rocks of the adjacent Prakasam Province. Assuming an intrusion age of ∼ 1.3 Ga, Sr-Nd isotopic composition of the dykes indicate that they preserved time-integrated LREE enrichment. In view of the chemical signatures of OIB source, the mafic dykes could as well be related to continental rifting, around 1.3 Ga, which may have been initiated by intra-plate volcanism.

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The Western Charnockite Zone of the Eastern Ghats Belt, India — An Independent Crustal Province of Late Archaean (2.8 Ga) and Palaeoproterozoic (1.7—1.6 Ga) Terrains

Cited by 79 publications

References 6 publications

A geochemical perspective on charnockite magmatism in Peninsular India

A geochemical perspective on charnockite magmatism in Peninsular India

Emplacement of Proterozoic massif-type anorthosite during regional shortening: evidence from the Bolangir anorthosite complex (Eastern Ghats Province, India)

Mafic dykes at the southwestern margin of Eastern Ghats belt: Evidence of rifting and collision

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