Crustal architecture and evolution of the Eastern Ghats Belt and adjacent regions of India

Dobmeier, Christoph; Raith, M.

doi:10.1144/gsl.sp.2003.206.01.09

Cited by 216 publications

(230 citation statements)

References 65 publications

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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%

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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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 grade and timing of metamorphism and charnockitic magmatism, along with the nature of protolithic crust, are shared with the Eastern Ghats of the Indian peninsula, and the two terranes are now regarded as having been a single tectonic entity attached to the cratonic core of India before the Neoproterozoic (e.g. Dobmeier & Raith 2003). Metamorphic reworking of the eastern Rayner -Eastern Ghats terrane in the late Neoproterozoic is limited to its margins (east and south in the Rayner Complex, north in the Eastern Ghats; Mezger & Cosca 1999).…”

Section: The Rayner Complexmentioning

confidence: 99%

Geosciences research in East Antarctica (0°E–60°E): present status and future perspectives

Satish-Kumar

Hokada

Kawakami

et al. 2008

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In both palaeoenvironmental and palaeogeographical studies, Antarctica plays a unique role in our understanding of the history of the Earth. It has maintained a unique geographical position at the South Pole for long periods. As the only unpopulated continent, the absence of political barriers or short-term economic interests has allowed international collaborative science to flourish. Although 98% of its area is covered by ice, the coastal Antarctic region is one of the wellstudied regions in the world. The integrity and success of geological studies lies in the fact that exposed outcrops are well preserved in the low-latitude climate. The continuing programme of the Japanese Antarctic Research Expedition focuses on the geology of East Antarctica, especially in the Dronning Maud Land and Enderby Land regions. Enderby Land preserves some of the oldest Archaean rocks on Earth, and the Mesoproterozoic to Palaeozoic history of Dronning Maud Land is extremely important in understanding the formation and dispersion of Rodinia and subsequent assembly of Gondwana. The geological features in this region have great significance in defining the temporal and spatial extension of orogenic belts formed by the collision of proto-continents. Present understanding of the evolution of East Antarctica in terms of global tectonics allows us to visualize how continents have evolved through time and space, and how far back in time the present-day plate-tectonic regime may have operated. Although several fundamental research problems still need to be resolved, the future direction of geoscience research in Antarctica will focus on how the formation and evolution of continents and supercontinents have affected the Earth's environment, a question that has been addressed only in recent years.

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“…Beside the polyphase deformation history, the Eastern Ghats Belt is also characterized by polycyclic metamorphic record and dehydration melting in different crustal protoliths [5][6][7][8][9]. However, in view of different crustal residence ages from different parts of the regional granulite terrain, as also distinct isotopic records of granulite facies metamorphism across this regional granulite terrain, the tectonic-metamorphic evolution should be discussed separately for the different crustal domains & provinces identified [10,11]. Barring the Archean domains of Ren- gali and Jaypore, the northern Eastern Ghats Belt, north of the Godavari rift is now described as the Eastern Ghats Province (EGP) and south of the Godavari rift is the Ongole domain (Figure 2).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…But an intrusive relation of the large-scale charnockitic bodies into the metasedimentary granulites (supracrustals) is not corroborated by the published isotopic data, as discussed in the following lines. Based primarily on Nd-mapping, several crustal domains or provinces with unrelated pre-metamorphic histories have been identified in the Eastern Ghats Belt [10,11]. Moreover, considering the metamorphic records in terms of their age two provinces are also recognized.…”

Section: Geochronologymentioning

confidence: 99%

Relative Chronology in High-Grade Crystalline Terrain of the Eastern Ghats, India: New Insights

Bhattacharya

Kar²,

Saw

et al. 2011

IJG

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The two major lithology or gneiss components in the polycyclic granulite terrain of the Eastern Ghats, India, are the supracrustal rocks, commonly described as khondalites, and the charnockite-gneiss. Northern Eastern Ghats belt, north of the Godavari rift has been defined as the Eastern Ghats Province, while that to the south has been defined as the Ongole domain; and although, these distinct crustal domains also record different ages of granulite metamorphism, both of these domains are dominated by the two lithologies. Many of the workers considered the khondalites as the oldest component with unknown basement and the charnockiteprotoliths as intrusive into the khondalites. However, published geochronological data do not corroborate the aforesaid relations. Onset of khondalite sedimentation in the Proterozoic Eastern Ghats Province, constrained by detrital zircon data, as around 1.3 Ga and the charnockite-protolith emplacement between 1.9 and 2.9 Ga, argue against intrusion of felsic magma (tonalite, now enderbite!) in to the khondalites. The field relations of the hornblende-mafic granulite with the two gneiss components together with Sm-Nd isotopic data of the hornblende-mafic granulites (both the xenoliths within charnockites and those interbanded with the khondalites) indicate that khondalite sediments were deposited on older mafic crustal rocks. Mafic basement and supracrustal rocks were subsequently deformed and metamorphosed together during collisional orogeny at high to ultra-high temperatures-partial melting of mafic rocks producing the charnockitic melt; and partial melting of pelitic sediments producing the peraluminous granitoids. This is compatible with all the geochronological data as well as the petrogenetic model of partial melting for the charnockitic rocks in the Eastern Ghats Belt. The Ongole domain, south of the Godavari rift, though, is distinct in terms of the age of first/ earliest UHT metamorphism, but here too the charnockite-protoliths are older mafic rocks evidently not intrusive in to the khondalites..

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Crustal architecture and evolution of the Eastern Ghats Belt and adjacent regions of India

Cited by 216 publications

References 65 publications

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

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

Geosciences research in East Antarctica (0°E–60°E): present status and future perspectives

Relative Chronology in High-Grade Crystalline Terrain of the Eastern Ghats, India: New Insights

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