Tectonic evolution of the Eastern Ghats Belt, India

Dasgupta, Somnath; Bose, Sankar; Das, Kaushik

doi:10.1016/j.precamres.2012.04.005

Cited by 187 publications

(69 citation statements)

References 82 publications

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“…Nevertheless, these studies represent crucial research that ultimately led to (extensional) accretionary orogenic systems being more widely invoked as regions of UHT/granulite formation (e.g. Collins, 2002;Hyndman et al, 2005;Currie and Hyndman, 2006;Brown, 2007a;Hyndman et al, 2009;Santosh et al, 2009a;Dasgupta et al, 2013). Collins (2002) argued that granulites are more commonly developed in extensional rather than collisional settings, citing the long-lived subductioneaccretion Tasmanide system of eastern Australia as the type example.…”

Section: Tectonic Settings Of Regional Uht/ht Granulite Metamorphismmentioning

confidence: 99%

On ultrahigh temperature crustal metamorphism: Phase equilibria, trace element thermometry, bulk composition, heat sources, timescales and tectonic settings

Kelsey

Hand

2015

Geoscience Frontiers

367

285

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a b s t r a c tUltrahigh temperature (UHT) metamorphism is the most thermally extreme form of regional crustal metamorphism, with temperatures exceeding 900 C. UHT crustal metamorphism is recognised in more than 50 localities globally in the metamorphic rock record and is accepted as 'normal' in the spectrum of regional crustal processes. UHT metamorphism is typically identified on the basis of diagnostic mineral assemblages such as sapphirine þ quartz, orthopyroxene þ sillimanite AE quartz and osumilite in MgeAlrich rock compositions, now usually coupled with pseudosection-based thermobarometry using internally-consistent thermodynamic data sets and/or Al-in-Orthopyroxene and ternary feldspar thermobarometry. Significant progress in the understanding of regional UHT metamorphism in recent years includes: (1) development of a ferric iron activityecomposition thermodynamic model for sapphirine, allowing phase diagram calculations for oxidised rock compositions; (2) quantification of UHT conditions via trace element thermometry, with Zr-in-rutile more commonly recording higher temperatures than Ti-in-zircon. Rutile is likely to be stable at peak UHT conditions whereas zircon may only grow as UHT rocks are cooling. In addition, the extent to which Zr diffuses out of rutile is controlled by chemical communication with zircon; (3) more fully recognising and utilising temperature-dependent thermal properties of the crust, and the possible range of heat sources causing metamorphism in geodynamic modelling studies; (4) recognising that crust partially melted either in a previous event or earlier in a long-duration event has greater capacity than fertile, unmelted crust to achieve UHT conditions due to the heat energy consumed by partial melting reactions; (5) more strongly linking UePb geochronological data from zircon and monazite to PeT points or path segments through using Y þ REE partitioning between accessory and major phases, as well as phase diagrams incorporating Zr and REE; and (6) improved insight into the settings and factors responsible for UHT metamorphism via geodynamic forward models. These models suggest that regional UHT metamorphism is, principally, geodynamically related to subduction, coupled with elevated crustal radiogenic heat generation rates.Ó 2014, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

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Section: Tectonic Settings Of Regional Uht/ht Granulite Metamorphismmentioning

confidence: 99%

On ultrahigh temperature crustal metamorphism: Phase equilibria, trace element thermometry, bulk composition, heat sources, timescales and tectonic settings

Kelsey

Hand

2015

Geoscience Frontiers

367

285

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“…Gregory et al, 2006;Pradhan et al, 2012) and from the Eastern Ghats Belt (e.g. DasGupta et al, 2013). While the overall zircon age distributions vary in terms of relative abundance of grains, strata from both the Marwar Supergroup and the Birmania Formation contain grains of the same age populations.…”

Section: Detrital Zircon Geochronologymentioning

confidence: 99%

Age and implications of the phosphatic Birmania Formation, Rajasthan, India

Hughes

Myrow

McKenzie

et al. 2015

Precambrian Research

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a b s t r a c tThe Birmania inlier in western Rajasthan, India, contains important phosphate deposits, the depositional age of which is poorly constrained. Here we provide the first direct age constraints for the phosphatebearing Birmania Formation using a combination of paleontological and detrital zircon U-Pb data. The occurrence of the multicellular algal fossil Wengania exquisita in phosphatic chert of the Birmania Formation suggest that it was deposited during the Ediacaran. Detrital zircon age distributions contain prominent populations of 1.7-1.9 Ga grains, with subordinate younger grains that range from 650 to 980 Ma. The distribution broadly resembles those from Neoproterozoic strata from both cratonic and Himalayan India but, like zircon age distributions from the Marwar Group, lacks 1.0-1.2 Ga grains, which may suggest that both areas shared similar local sources. The lack of zircon grains younger than ∼650 Ma is consistent with an Ediacaran depositional age because almost all Cambrian or younger strata from India have yielded Cambrian or latest Neoproterozoic age grains. These findings raise the possibility of a previously unrecognized late Neoproterozoic episode of phosphogenesis on the India craton. The presence of Wengania exquisita further supports strong palaeogeographic affinity between the India and South China during the Neoproterozoic and Cambrian.

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“…The eastern foreland of this Pan-African orogen would be the c. 1.0 Ga Rayner Complex of Enderby, Kemp and MacRobertson lands, which has characteristic charnockite magmatism and metamorphism at 990-900 Ma and correlates with the Eastern Ghats Province of India (Black et al 1987;Kelly et al 2002;Dobmeier & Raith 2003;Halpin et al 2005;Dasgupta et al 2013). Protolith ages for the Pan-African granulites of eastern Dronning Maud Land are poorly constrained, but meta-tonalite in the SW Sør Rondane Mountains preserves pre-metamorphic intrusive ages of 998-995 and 945-920 Ma (Kamei et al 2013).…”

Section: Antarctica Dividedmentioning

confidence: 99%

“…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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Tectonic evolution of the Eastern Ghats Belt, India

Cited by 187 publications

References 82 publications

On ultrahigh temperature crustal metamorphism: Phase equilibria, trace element thermometry, bulk composition, heat sources, timescales and tectonic settings

On ultrahigh temperature crustal metamorphism: Phase equilibria, trace element thermometry, bulk composition, heat sources, timescales and tectonic settings

Age and implications of the phosphatic Birmania Formation, Rajasthan, India

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

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