Low Pressure Metamorphism, Deformation and Syntectonic Granite Emplacement in the Palaeoproterozoic Mahakoshal Supracrustal Belt, Central India

Roy, Abhinaba; Prasad, M. Hanuma; Devarajan, Malathi

doi:10.1016/s1342-937x(05)70737-1

Cited by 28 publications

(17 citation statements)

References 10 publications

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“…In fact, most Late Palaeoproterozoic basins in the South Indian Block are riftogenic Chaudhuri et al, 2002;Naqvi, 2005) with syndepositional (anorogenic) volcanic rocks, prominent being the Cuddapah Supergroup (deposited over the Eastern Dharwar Craton) and the Mahakoshal Group, deposited on the Bastar Craton (Roy and Devarajan, 2000). Hence a general state of extension prevailed during the Late Palaeoproterozoic in the South Indian Block, associated with anorogenic volcanism.…”

Section: Introductionmentioning

confidence: 99%

Palaeoproterozoic (∼1.9Ga) extension and breakup along the eastern margin of the Eastern Dharwar Craton, SE India: New Sm–Nd isochron age constraints from anorogenic mafic magmatism in the Neoarchean Nellore greenstone belt

Vadlamani

2010

Journal of Asian Earth Sciences

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Section: Introductionmentioning

confidence: 99%

Palaeoproterozoic (∼1.9Ga) extension and breakup along the eastern margin of the Eastern Dharwar Craton, SE India: New Sm–Nd isochron age constraints from anorogenic mafic magmatism in the Neoarchean Nellore greenstone belt

Vadlamani

2010

Journal of Asian Earth Sciences

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“…1999; Acharyya & Roy 2000; Roy & Devarajan 2000; Bandyopadhyay et al. 2001; Roy et al. 2002; Roy & Prasad 2003).…”

Section: Introductionmentioning

confidence: 99%

Petrogenesis and tectonic setting of bimodal volcanism in the Sakoli Mobile Belt, Central Indian shield

Ahmad¹,

Longjam²,

Fouzdar³

et al. 2009

Island Arc

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The Sakoli Mobile Belt comprises bimodal volcanic rocks that include metabasalt, rhyolite, tuffs, and epiclastic rocks with metapelites, quartzite, arkose, conglomerate, and banded iron formation (BIF). Mafic volcanic rocks are tholeiitic to quartz‐tholeiitic with normative quartz and hypersthene. SiO2 shows a large compositional gap between the basic and acidic volcanics, depicting their bimodal nature. Both the volcanics have distinct geochemical trends but display some similarity in terms of enriched light rare earth element–large ion lithophile element characteristics with positive anomalies for U, Pb, and Th and distinct negative anomalies for Nb, P, and Ti. These characteristics are typical of continental rift volcanism. Both the volcanic rocks show strong negative Sr and Eu anomalies indicating fractionation of plagioclases and K‐feldspars, respectively. The high Fe/Mg ratios for the basic rocks indicate their evolved nature. Whole rock Sm–Nd isochrons for the acidic volcanic rocks indicate an age of crystallization for these volcanic rocks at about 1675 ± 180 Ma (initial 143Nd/144Nd = 0.51017 ± 0.00017, mean square weighted deviate [MSWD] = 1.6). The εNdt (t = 2000 Ma) varies between −0.19 and +2.22 for the basic volcanic rock and between −2.85 and −4.29 for the acidic volcanic rocks. Depleted mantle model ages vary from 2000 to 2275 Ma for the basic and from 2426 to 2777 Ma for the acidic volcanic rocks, respectively. These model ages indicate that protoliths for the acidic volcanic rocks probably had a much longer crustal residence time. Predominantly basaltic magma erupted during the deposition of the Dhabetekri Formation and part of it pooled at crustal or shallower subcrustal levels that probably triggered partial melting to generate the acidic magma. The influence of basic magma on the genesis of acidic magma is indicated by the higher Ni and Cr abundance at the observed silica levels of the acidic magma. A subsequent pulse of basic magma, which became crustally contaminated, erupted as minor component along with the dominantly acidic volcanics during the deposition of the Bhiwapur Formation.

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“…The different intrusions have given Palaeoto Meso-proterozoic ages: 1.8-1.865 Ga for Tamkhan and Barambara granites; 2.405 Ga for associated Barambara granodiorite; 1.7-1.8 Ga for Jhirgadandi monzodiorite/quartz syenite, Bori syenite and Rihand-Renusagar calc-alkaline granitoids Roy and Devarajan, 2000). As stated already, the MFB is a volcano-sedimentary assemblage.…”

Section: Parsoi Formation Agori Formationmentioning

confidence: 71%

Cratons and Fold Belts of India

Sharma

2010

Lecture Notes in Earth Sciences

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BC Bastar Craton BKC Bundelkhand Craton (massif) BGC Banded Gneissic Complex CGC Chhotanagpur Granite-Gneiss Complex EDC Eastern Dharwar Craton MGC Meghalaya Craton SBC Singhbhum Craton WDC Western Dharwar Craton vi A hundred times a day I remind myself that my inner and outer lives are based on the labors of other people, living and dead, and that I must exert myself in order to give in the same measure as I have received and am still receiving. Albert Einstein Dedicated to the memory of my sister Rajbai and her mother-in-law Bhoribai whose benevolence and guardianship helped me attain what I could. ForewordProfessor Ram Swaroop Sharma whom I affectionately address as Bhratashri has asked me to write a foreword for his book on "Cratons and Fold Belts of India". Bhratashri's wish is always my command and this foreword is written with both delight and humility. Formation of rocks to make up the continental crust and the assembly of such rocks to form a contiguous and large physiographic feature called landmass is a first order geological problem. Several other geological problems such as the formation of various landforms (mountains, plateaus and plains), various mineral deposits, development/maintenance/evolution of hydrologic cycle, climate and life, and rivers and their basins are integral parts of this first order problem. Just as the fundamental thing called water is taken for granted, so also the existence of land on earth. Although land may not be a critical environmental resource, the existence of land is critical to the physics and chemistry of the life system on earth. This basic truth, perhaps realized by Vedic men, is dawned on to the contemporary scientific community only towards the end of the twentieth century, thanks to the developing environmental problems.Our knowledge of the earth, its materials and processes, is very rapidly increasing due to advancement in technical tools of investigations and in theoretical aspects of physics, chemistry and biology. The advent of plate tectonic theory after the Second World War and the realization of environmental consequences of consumption of earth materials and ecosystem services contributed very significantly to our understanding of earth processes. Studies of the Precambrian Geology of India have made very good use of all these development as well as International scientific cooperation. Although our knowledge of the formation of India as a landmass is better today than ever before, it is still far from what is required to sustain human "civilization."Prof. Sharma's book on "Cratons and Fold Belts of India" is an excellent exposition of the current status of our knowledge of the geology of Archaean cratonic parts of the Indian landmass and of the geology and processes of formation of Proterozoic fold belts on the cratonic basements (cratonic, of course, not during Proterozoic!). The book also provides, for an uninitiated but interested, in the first three chapters, concepts of terrain and terrain making processes, major cratonic terrains of India and pro...

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Low Pressure Metamorphism, Deformation and Syntectonic Granite Emplacement in the Palaeoproterozoic Mahakoshal Supracrustal Belt, Central India

Cited by 28 publications

References 10 publications

Palaeoproterozoic (∼1.9Ga) extension and breakup along the eastern margin of the Eastern Dharwar Craton, SE India: New Sm–Nd isochron age constraints from anorogenic mafic magmatism in the Neoarchean Nellore greenstone belt

Palaeoproterozoic (∼1.9Ga) extension and breakup along the eastern margin of the Eastern Dharwar Craton, SE India: New Sm–Nd isochron age constraints from anorogenic mafic magmatism in the Neoarchean Nellore greenstone belt

Petrogenesis and tectonic setting of bimodal volcanism in the Sakoli Mobile Belt, Central Indian shield

Cratons and Fold Belts of India

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