Emplacement and deformation of the Vinukonda meta-granite (Eastern Ghats, India)—Implications for the geological evolution of peninsular India and for Rodinia reconstructions

Dobmeier, Christoph; Lütke, S.; Hammerschmidt, Konrad; Mezger, Klaus

doi:10.1016/j.precamres.2006.01.011

Cited by 119 publications

(49 citation statements)

References 34 publications

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“…This tectonic pattern is consistent with an oblique collision of the MawsonAustralia continent with peninsular India, producing dextral escape tectonics along the Pinjarra Orogen [Fitzsimons, 2003] and coeval shearing along major dextral shear zones in the Rengali Province in the northern EGMB [Crowe et al, 2003] and thrusting in the west [Dobmeier et al, 2006;Upadhyay et al, 2006a], something already proposed, among others by Harris [1993], Harris and Beeson [1993], Beeson et al [1995] and Powell and Pisarevsky [2002]. Previous work has, however, highlighted a polyphase nature of tectonism in the EGMB and in the Rengali Province [e.g.…”

Section: Tectonic Implicationssupporting

confidence: 73%

“…[6] Sm-Nd, Rb-Sr and Pb-Pb isotopic investigations on the rocks of the EGMB show Neoarchean to Paleoproterozoic crustal residence ages (2.5 -3.9 Ga) which are interpreted to reflect variable mixing of Archean and Proterozoic materials, consistent with an active continental margin setting [Paul et al, 1990;Rickers et al, 2001;Dobmeier et al, 2006]. Four isotopic domains have been identified in the belt (Figure 2) cutting across the lithotectonic zones with the exception of the Domain 1 which parallels the WCZ [Rickers et al, 2001].…”

Section: Geochronologymentioning

confidence: 99%

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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

2007

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Sensitive High Resolution Ion MicroProbe (SHRIMP) U‐Pb dating of zircon from basement granite gneisses and nepheline syenites of the Sinapalli Nappe, occurring along the northwestern margin of the Eastern Ghats Mobile Belt, indicate high grade regional metamorphism and associated folding accompanying juxtaposition of the nappe with the Bhandara Craton, to have taken place between 617 ± 85 Ma (lower intercept age of a reworked basement unit) and 517 Ma (age of the youngest syenite). This shows, for the first time, that the final juxtaposition of the northwestern parts of the Eastern Ghats Mobile Belt against the Bhandara Craton came about in the late Neoproterozoic and not, as previously thought, during the Mesoproterozoic. The northwestern part of the Eastern Ghats Mobile Belt comprises a fold‐ thrust belt consisting of a stack of northwesterly verging nappes that have been thrust over the Bhandara Craton. The Sinapalli Nappe is the lowermost nappe and rests over a tectonic contact on the Archean granites and gneisses of the craton. The basal décollement is exposed as a two‐km‐wide ductile‐brittle thrust, hosting nepheline syenite plutons that show fabrics consistent with a synkinematic emplacement during thrusting. The Sinapalli Nappe is comprised of a sequence of alternating mafic granulites and quartzofeldspathic gneisses with slivers of basement granites, which are folded in three phases of folding (F1, F2 and F3) and were subjected to granulite facies metamorphism during F1 folding. Thrusting is synkinematic to F2 folding and is responsible for the juxtaposition of the northwestern part of the Eastern Ghats Terrane over the Bhandara Craton during the assembly of parts of eastern Gondwana.

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Section: Tectonic Implicationssupporting

confidence: 73%

Section: Geochronologymentioning

confidence: 99%

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

2007

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“…Rb-Sr model age for the Vellaturu granite is given as ∼ 1575 Ma (Agnigundla granite of Crawford and Compston 1973). Similar dates have been reported for the Vinukonda granite occurring in the NSB c.10 km east of Vellaturu (Rb-Sr isochron age ∼ 1600 Ma, Gupta et al 1984; U-Pb Zr discordia age ∼ 1580 Ma, Dobmeier et al 2006). The Vellaturu granite has been interpreted either as representing a reactivated basement circumscribed by a metasedimentary cover (Nagaraja Rao et al 1987), or as intrusive into the surrounding Nallamalai rocks (Narayanswami 1966;Ramam and Murthy 1997;Saha 2002).…”

Section: Regional Geologysupporting

confidence: 67%

“…A later deformation affecting the Nallamalai group, as well as the overlying Neoproterozoic Kurnool Group in Kundair valley and Palnad area has not so far been directly constrained by any radiometric dates. But the regional geologic set-up and available dates from the neighbouring regions indirectly suggest superimposed deformation of these rock groups during the Grenville and/or PanAfrican convergence (Saha and Chakraborty 2003;Dobmeier et al 2006).…”

Section: Regional Geologymentioning

confidence: 99%

Advective heat transfer and fabric development in a shallow crustal intrusive granite — the case of Proterozoic Vellaturu granite, south India

Saha

Chakraborti

2007

J Earth Syst Sci

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Syntectonic plutons emplaced in shallow crust often contain intermediate-to low-temperature deformation microstructures but lack a high-temperature, subsolidus deformation fabric, although the relict magmatic fabric is preserved. The Proterozoic Vellaturu granite emplaced at the eastern margin of the northern Nallamalai fold belt, south India during the late phase of regional deformation has a common occurrence of intermediate-to low-temperature deformation fabric, superimposed over magmatic fabric with an internally complex pattern. But high-T subsolidus deformation microstructure and fabric are absent in this pluton. The main crystal plastic deformation and fluid enhanced reaction softening was concentrated along the margin of the granite body. Resulting granite mylonites show Y-maximum c-axis fabric in completely recrystallized quartz ribbons, dynamic recrystallization of perthites, and myrmekite indicative of fabric development under intermediate temperature (∼ 500-400 • C). The weakly-deformed interior shows myrmekite, feldspar microfracturing and limited bulging recrystallization of quartz. The abundance of prism subgrain boundaries is indicative of continuing deformation through low-temperature (∼ 300 • C). The relative rates of cooling influenced by advective heat transfer and deformation of the pluton seem to control the overall subsolidus fabric development. The rapid advective heat transfer from the interior in the early stages of subsolidus cooling was followed by slow cooling through intermediate temperature window as a well-developed phyllosilicate rich mylonitic skin around the granite body slowed down conductive heat loss. Low-T crystal plastic deformation of quartz was effected at a late stage of cooling and deformation of the shallow crustal granite body emplaced within the greenschist facies Nallamalai rocks.

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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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Emplacement and deformation of the Vinukonda meta-granite (Eastern Ghats, India)—Implications for the geological evolution of peninsular India and for Rodinia reconstructions

Cited by 119 publications

References 34 publications

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

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

Advective heat transfer and fabric development in a shallow crustal intrusive granite — the case of Proterozoic Vellaturu granite, south India

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

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