Mid-Proterozoic Plume-Related Thermal Event in Eastern Indian Craton: Evidence from Trace Elements, REE Geochemistry and Sr - Nd Isotope Systematics of Basic-Ultrabasic Intrusives from Dalma Volcanic Belt

Roy, Abhinaba; Sarkar, Anindya; Jeyakumar, S. Johnson; Aggrawal, S. K.; Ebihara, Mitsuru

doi:10.1016/s1342-937x(05)70897-2

Cited by 94 publications

(49 citation statements)

References 43 publications

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“…An areally extensive felsic volcanic lithopackage of welded tuffs and ignimbrites is located in the northern part of the NSMB (Acharyya et al, 2006). While available Rb-Sr whole rock isochron age data appear to indicate an Early Mesoproterozoic age for mafic and felsic volcanism (Sengupta et al, 2000;Roy et al, 2002), this needs to be tested by U-Pb zircon dating. Several workers determined the deformation and metamorphic history of the chloritoid þ kyanite, chlorite þ garnet þ staurolite, chlorite þ kyanite þ staurolite AE chloritoid, chlorite þ biotite þ garnet AE plagioclase, garnet þ kyanite þ biotite þ muscovite assemblages in pelites of varying bulk rock compositions, along the length of the belt.…”

Section: Discussionmentioning

confidence: 99%

∼1.6 Ga ultrahigh‐temperature granulite metamorphism in the Central Indian Tectonic Zone: insights from metamorphic reaction history, geothermobarometry and monazite chemical ages

et al. 2011

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In this study, we present precise pressure-temperature (P-T) and age constraints of ultrahigh-temperature (UHT) metamorphism of the Bhandara-Balaghat granulite (BBG) domain at the southern margin of the Central Indian Tectonic Zone (CITZ). Supracrustal and metaigneous granulites of this domain, which lie as detached pods and lenses of various sizes within felsic gneiss-migmatite association record protracted high-T crustal anatexis events, broadly synchronous with and/or punctuated with felsic and mafic plutonism. Magnesian metagreywacke protolith of the supracrustal suite records extensive biotite melting and subsequent melt extractions at deep crustal, UHT metamorphic conditions (T ! $9008C at P$8 kbar), producing restitic mineral assemblages of garnet þ rutile, garnet þ cordierite and garnet þ aluminous orthopyroxene. The diversity of the mineral assemblages is related to the domainal-scale variation of the bulk rock composition. In situ chemical age dating of five monazite grains, which occur in the different textural settings of the garnet þ cordierite þ orthopyroxene þ rutile-bearing granulite reveals two age domains: (1) Pervasive $1.6 Ga domain, which is recorded in monazites occurring as inclusions in garnet and in the leucosome matrix is correlated with the timing of the UHT metamorphism. (2) $1.47 Ga domain reflects a fluid-mediated recrystallization event leading to dissolution and re-precipitation of older monazite. The $1.6 Ga monazite chemical ages provide robust constraints on the timing of the earliest stage of tectonothermal processes in the CITZ (defined here as the 'Central Indian Orogeny'). The significance of the $1.6 Ga hot orogenesis in interorogen correlation is discussed.

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Section: Discussionmentioning

confidence: 99%

∼1.6 Ga ultrahigh‐temperature granulite metamorphism in the Central Indian Tectonic Zone: insights from metamorphic reaction history, geothermobarometry and monazite chemical ages

et al. 2011

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“…Study of Sm and Nd isotopes from some subvolcanic/intrusive mafic-ultramafic rocks viz. "gabbropyroxenite" from within PSB metasediments and of unknown temporal relation with Dalma volcanism, has generated an age of 1619±38 (Roy et al 2002a). It should also be emphasized that (older) ultrabasic and (younger) basic effusions of Dalma volcanic belt are separated by a time interval marked by reworked volcaniclastic deposits (Bose and Chakraborti, 1981).…”

Section: Age and Distribution Of Mafic Igneous Rocksmentioning

confidence: 99%

Precambrian mafic magmatism in the Singhbhum craton, eastern India

Bose

2009

J Geol Soc India

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The Singhbhum craton has a chequred history of mafic magmatism spanning from early Archaean to Proterozoic. However, lack of adequate isotopic age data put constraints on accurately establishing the history of spatial growth of the craton in which mafic magmatism played a very significant role. Mafic magmatism in the craton spreads from ca.3.3 Ga (oldest "enclaves" of orthoamphibolites) to about 0.1 Ga ('Newer dolerite' dyke swarms). Nearly contemporaneous amphibolite and intimately associated tonalitic orthogneiss may represent Archaean bimodal magmatism. The metabasic enclaves are appreciably enriched and do not fulfill the geochemical characteristics of worldwide known early Archaean (>3.0 Ga) mafic magmatism. The enclaves reveal compositional spectrum from siliceous high-magnesian basalt (SHMB) to andesite. However, the occurrence of minor depleted boninitic type within the assemblage has so far been overlooked. High magnesian basalt with boninitic character of Mesoarchaean age is also reported in association with supracrustals from southern fringe of the granitoid cratonic nucleus. The subcontinental lithospheric mantle (SCLM) below the craton is conjectured to have initiated during the early Archaean. Significantly, recurrence of depleted magma types in the craton is observed during the whole span of mafic igneous activity which has been vaguely related to "mantle heterogeneity", although the alternative model of sequential mantle melting is also being explored.The Singhbhum craton includes the Banded Iron Formation (BIF) associated mafic lavas, MORB-like basic and komatiitic ultrabasic bimodal volcanism -documented as Dalma volcanics, Dhanjori lavas, and the Proterozoic Newer dolerite dykes. Three different types of REE fractionation patterns are observed in the BIF-associated mafic lavas. These are the REE unfractionated type is more depleted than N-MORB and some lavas with boninitic type of REE distribution. MORB-like basic and komatiitic ultrabasic (Dalma volcanics) are emplaced within the Proterozoic Singhbhum Basin (PSB). The vista of magmatism in the basin was controlled by a miniature spreading centre represented by the mid-basinal Dalma volcanic ridge. The volcano-sedimentary basinal domain of Dhanjori emerged at the interface of two subprovinces (viz. the mobile volcano-sedimentary belt of PSB and rigid granite platform) under unique stress environment related to extensional tectonic regime. Trace element distribution in Dhanjori lavas is remarkably similar to that in PSB minor intrusions and lavas (except a Ta spike in the latter). The Proterozoic Newer dolerite dykes within Singhbhum nucleus manifest an unusually wide spam of intrusive activity (ca 2100 Ma to 1100 Ma) and unexpectedly uniform mantle melting behaviour.

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“…We have also plotted in Fig. 7 Nb/Y-Zr/Y ratios of mid-Proterozoic (~1.6 Ga; Roy et al, 1999Roy et al, , 2002a) Dalma basalts, komatiites and ultrabasic intrusives all of which have been found to be depleted mantle products (in terms of both REE and ε Nd , data taken from Bose et al, 1989;Saha, 1994;Roy, 1998, Roy et al, 2002a. Interestingly, all these units of Dalma belt also fall within the plume array and together they indicate that the plume magmatism was quite active during the Proterozoic of the EIC.…”

Section: ; Note That Both the Dhanjori And Dalma Basic/ultrabasic Datmentioning

confidence: 99%

Sm-Nd age and mantle source characteristics of the Dhanjori volcanic rocks, Eastern India.

et al. 2002

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Mid-Proterozoic Plume-Related Thermal Event in Eastern Indian Craton: Evidence from Trace Elements, REE Geochemistry and Sr - Nd Isotope Systematics of Basic-Ultrabasic Intrusives from Dalma Volcanic Belt

Cited by 94 publications

References 43 publications

∼1.6 Ga ultrahigh‐temperature granulite metamorphism in the Central Indian Tectonic Zone: insights from metamorphic reaction history, geothermobarometry and monazite chemical ages

∼1.6 Ga ultrahigh‐temperature granulite metamorphism in the Central Indian Tectonic Zone: insights from metamorphic reaction history, geothermobarometry and monazite chemical ages

Precambrian mafic magmatism in the Singhbhum craton, eastern India

Sm-Nd age and mantle source characteristics of the Dhanjori volcanic rocks, Eastern India.

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