Timing and dynamics of the juxtaposition of the Eastern Ghats Mobile Belt against the Bhandara Craton, India: A structural and zircon U‐Pb SHRIMP study of the fold‐thrust belt and associated nepheline syenite plutons

Biswal, Tapas Kumar; Waele, Bert De; Ahuja, Harish

doi:10.1029/2006tc002005

Cited by 105 publications

(71 citation statements)

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“…French et al (2008) dated a mafic sill in the Cuddapah basin of the Dharwar Craton as *1.9 Gy old and proposed that the Bastar-Cuddapah mafic igneous activity represented a large igneous province emplaced in the Dharwar and Bastar cratons at *1.9 Ga. Palaeomagnetic results from mafic dykes lend credence to the notion of temporal and spatial link between the Dharwar and Bastar cratons by *1.9 Ga (Meert et al 2011) and between the Bastar and Bundelkhand cratons by *2.0 Ga (Pradhan et al 2012). The EGMB, which is a granulite facies, high-grade metamorphic belt, was juxtaposed against the Bastar Craton along a terrane boundary shear zone during the Pan-African orogeny at 550-500 Ma (Biswal et al 2007;Das et al 2008). …”

Section: Geology Of the Bastar Cratonsupporting

confidence: 51%

Petrology of Lamproites from the Nuapada Lamproite Field, Bastar Craton, India

Sahu

Gupta²,

Patel³

et al. 2013

Proceedings of 10th International Kimberlite Conference

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This work presents the first mineralogical, geochemical and 40 Ar/ 39 Ar geochronological data on hypabyssal facies lamproites near Kalmidadar and Darlimunda in the Nuapada Lamproite Field of the Bastar Craton. The Kalmidadar lamproite is a diamondiferous intrusion with surface dimension of *320 m 9 160 m, whereas the Darlimunda lamproite is a dyke swarm comprising clusters of several narrow (\5 m wide) and elongated bodies. Indicator mineral suite around the Kalmidadar lamproite is marked by abundance of Cr-spinel, rarity of garnet and absence of Cr-diopside and picroilmenite. Mineralogically, the Kalmidadar lamproite comprises phenocrysts of olivine (pseudomorphed by calcite and talc) and microphenocrysts of phlogopite set in a groundmass of chlorite and calcite. The phlogopite is Ti rich (5.4-7.4 wt % TiO 2 ), and the relationship between its Ti content and octahedral site deficiency indicates two substitution mechanisms, viz. Ti + ' $ 2 Mg and Ti ? 2Al $ Mg ? 2Si. The Darlimunda lamproites have undergone pervasive hydrothermal and/or deuteric alteration, which has resulted in complete chloritisation of phlogopite and extensive silicification of the rocks. Tiny grains of rutile and apatite are commonly scattered in the groundmass of both Kalmidadar and Darlimunda lamproites. The Nuapada lamproites have high contents of compatible elements such as V, Cr and Ni and of incompatible elements such as Ba, Zr, Nb and Hf. They also show high abundance of REE and enrichment in LREE relative to HREE. The incompatible element distribution patterns of the lamproites are marked by Nb, Sr, P, Hf and Zr anomalies relative to REE. The observed petrological and geochemical characteristics of the Nuapada lamproites are consistent with the derivation of the magma from a metasomatised subcontinental lithospheric mantle source. Whole-rock 40 Ar/ 39 Ar isotopic data yields an age of 1055 ± 10 Ma for the Nuapada lamproites.

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Section: Geology Of the Bastar Cratonsupporting

confidence: 51%

Petrology of Lamproites from the Nuapada Lamproite Field, Bastar Craton, India

Sahu

Gupta²,

Patel³

et al. 2013

Proceedings of 10th International Kimberlite Conference

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“…1). The craton (eastern DharwareBastareSinghbhum)e EGB contact in eastern India, where the granulite-facies rocks of the EGB are thrusted over the cratonic rocks, has been interpreted as a crustal suture related to Indo-Antarctic collisional events (Chetty and Murthy, 1994;Leelanandam et al, 2006;Biswal et al, 2007;Das et al, 2008;Upadhyay, 2008;Mohanty, 2012) which resulted in the formation of the Proterozoic EGB orogen (Grew and Manton, 1986;Dasgupta and Sengupta, 2003;Dobmeier and Raith, 2003). Like the SGT, EGB also includes a series of multiply deformed and polymetamorphosed terrains, bounded and segmented by shear zones and thrust faults (Ramakrishnan et al, 1998;Rickers et al, 2001;Dasgupta and Sengupta, 2003;Dobmeier and Raith, 2003).…”

Section: Eastern Ghats Beltmentioning

confidence: 99%

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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“…The Prydz-Denman region is the most likely candidate for displacements of this magnitude, although another possible site is the Eastern Ghats Belt of India, where, like Antarctica, there is increasing evidence for Pan-African 0.5 Ma tectonism within what was previously regarded as a c. 1.0 Ga metamorphic belt. This has led to controversial proposals that the Eastern Ghats and equivalent Rayner Complex of Antarctica collided with the Dharwar and Bastar cratons of India at c. 0.5 Ga (Dobmeier et al 2006;Biswal et al 2007;Simmat & Raith 2008), but most workers still argue for assembly at c. 1.0 Ga followed by intracratonic reworking at c. 0.5 Ga (e.g. Dasgupta et al 2013).…”

Section: Antarctica Dividedmentioning

confidence: 99%

Antarctica and supercontinent evolution: historical perspectives, recent advances and unresolved issues

Harley

Fitzsimons

Zhao

2013

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The Antarctic rock record spans some 3.5 billion years of history, and has made important contributions to our understanding of how Earth's continents assemble and disperse through time. Correlations between Antarctica and other southern continents were critical to the concept of Gondwana, the Palaeozoic supercontinent used to support early arguments for continental drift, while evidence for Proterozoic connections between Antarctica and North America led to the 'SWEAT' configuration (linking SW USA to East Antarctica) for an early Neoproterozoic supercontinent known as Rodinia. Antarctica also contains relicts of an older Palaeo-to Mesoproterozoic supercontinent known as Nuna, along with several Archaean fragments that belonged to one or more 'supercratons' in Neoarchaean times. It thus seems likely that Antarctica contains remnants of most, if not all, of Earth's supercontinents, and Antarctic research continues to provide insights into their palaeogeography and geological evolution. One area of research is the latest Neoproterozoic-Mesozoic active margin of Gondwana, preserved in Antarctica as the Ross Orogen and a number of outboard terranes that now form West Antarctica. Major episodes of magmatism, deformation and metamorphism along this palaeo-Pacific margin at 590 -500 and 300-230 Ma can be linked to reduced convergence along the internal collisional orogens that formed Gondwana and Pangaea, respectively; indicating that accretionary systems are sensitive to changes in the global plate tectonic budget. Other research has focused on Grenville-age (c. 1.0 Ga) and PanAfrican (c. 0.5 Ga) metamorphism in the East Antarctic Craton. These global-scale events record the amalgamation of Rodinia and Gondwana, respectively. Three coastal segments of Grenville-age metamorphism in the Indian Ocean sector of Antarctica are each linked to the c. 1.0 Ga collision between older cratons but are separated by two regions of pervasive Pan-African metamorphism ascribed to Neoproterozoic ocean closure. The tectonic setting of these events is poorly constrained given the sparse exposure, deep erosion level and likelihood that younger metamorphic events have reactivated older structures. The projection of these orogens under the ice is also controversial, but it is likely that at least one of the Pan-African orogens links up with the Shackleton Range on the palaeo-Pacific margin of the craton. Sedimentary detritus and glacial erratics at the edge of the ice sheet provide evidence for the c.

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Timing and dynamics of the juxtaposition of the Eastern Ghats Mobile Belt against the Bhandara Craton, India: A structural and zircon U‐Pb SHRIMP study of the fold‐thrust belt and associated nepheline syenite plutons

Cited by 105 publications

References 68 publications

Petrology of Lamproites from the Nuapada Lamproite Field, Bastar Craton, India

Petrology of Lamproites from the Nuapada Lamproite Field, Bastar Craton, India

A geochemical perspective on charnockite magmatism in Peninsular India

Antarctica and supercontinent evolution: historical perspectives, recent advances and unresolved issues

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