Fossil marginal bassin from the Indian shield: A model for the evolution of Singhbhum Precambrian belt, Eastern India

Bose, Mihir K.; Chakraborti, Manas K.

doi:10.1007/bf01822131

Cited by 42 publications

(18 citation statements)

References 17 publications

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“…The majority of these models envisage an early N-S extension, leading to the opening of a volcano-sedimentary basin (cf. NSMB) either in ensialic (Gupta et al, 1980;Mukhopadhyay, 1984;Sarkar et al, 1992;Ghosh et al, 2006;Acharyya et al, 2006), or marginal basin (Bose and Chakrabarty, 1981;Bose et al, 1989) settings, and succeeded by compressional deformation, causing basin inversion following either intraplate subduction (Sarkar and Saha, 1977), microcontinental subduction (Sarkar, 1982) or collision (Ghosh et al, 2006;Mahato et al, 2008). Available geochronological data, however, do not support an intracontinental rift related setting for the evolution of the NSMB, as Archaean ancestry of the CGC, which is required for a uniform cratonic basement across the NSMB, has not been established.…”

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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“…the supracrustals) of Singhbhum craton cut across the conventional Archaean-Proterozoic boundary (Mahadevan, 2002). However, the Proterozoic Singhbhum Basin (PSB) accreted on the northern fringe ( Fig.3) of the Singhbhum nucleus, has the characteristic bimodal volcanic geochemistry (represented by midbasinal Dalma volcanic belt) and related tectonosedimentary features of Archaean greenstone belts (Bose and Chakraborti, 1981;Bose et al 1989;Condie, 1990;Bose, 2000).…”

Section: Geological and Tectonic Setting Of The Terrainmentioning

confidence: 99%

“…The Dalma volcanic sequence is characterised by a lower komatiite/picrite member followed by younger MORB-like Bose, 1994) basalt, the two lithomembers separated by a feebly reworked coarse pyroclastic horizon (Bose and Chakraborti, 1981). A model of upwelling magma ponding and crustal delamination (Mukhopadhyay, 1984) would have produced highly evolved magmas rather than komatiite and MORBlike Dalma basalts (Bose et al 1989).…”

Section: Geological and Tectonic Setting Of The Terrainmentioning

confidence: 99%

“…"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). Thus "gabbro-pyroxenite" couple does not represent a temporal group for basin volcanism.…”

Section: Age and Distribution Of Mafic Igneous Rocksmentioning

confidence: 99%

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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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“…Sedimentary facies variations indicate that the Chaibasa formation is a flysch (Saha, 1994;Mahadevan, 2002;Mukhopadhyay, 1988;Sinha-Roy and Gupta, 1995). In the northern fringe of the Singhbhum nucleus there is a Proterozoic Singhbhum basin (PSB) which shows characteristic bimodal volcanic geochemistry (shown in the mid-basinal Dalma volcanic belt) and related tectono-sedimentary features of Archean greenstone belts (Bose and Chakraborty, 1992;Bose et al, 1989;Condie, 1990;Bose, 2000). Reconstruction of the paleo-tectonic setting (Chakraborty and Bose, 1985) suggests that PSB is a rifted continental margin generated in an extensional tectonic regime (Bose, 1994).…”

Section: Introductionmentioning

confidence: 99%

Newer Dolerite dykes, Jharkhand, India: a case study of magma generation, differentiation and metasomatism in a subduction zone setting

Sengupta

Ray

2012

Geochem. J.

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belong to different generations (Saha et al., 1973). The geochemical characters of these dykes are strikingly uniform over a long period of time (Bose, 2008;Mallick and Sarkar, 1994). Bose (2008) suggested that Newer Dolerite dykes generated through partial melting of subcontinental mantle which in turn was metasomatised. Mir et al. (2010) documented geochemical characteristics of these dykes similar to those of back arc extension basalts (BABB). In the studied area shear fractures which appears to act as pathways of these mafic intrusives have two dominant trends NE-SW and E-W and a subsidiary NW-SE trends. This might suggest that stress system have not an uniform direction over a long period, but it changed orientation with time. The geochemical classification of these dykes and their linking to possible tectonic settings have not yet been reported by earlier workers. In the present work, attempts have been made to classify these dykes according to their trace and REE composition. The genesis of different chemical types of Newer Dolerite dykes has been discussed in the perspective of possible tectonic setting. GEOLOGICAL SETTINGThere is a prevalent idea to consider the Singhbhum craton as a "greenstone granite terrain" (Mahadevan, The NE-SW, NW-SE and E-W trending Proterozoic Newer Dolerite dykes around Chaibasa, Jharkhand, India are found to intrude Singhbhum Granites of late Archean age. Clouded plagioclase, bastitised orthopyroxene and uralitized clinopyroxene, magnetite-ilmenite, quartz-feldspar granophyric intergrowth are the characteristic minerals present in the dolerite dykes which assign a low grade metamorphosed character to the dolerite. Both olivine normative and quartz normative varieties are observed in this suite of dykes. These dolerites have been classified into two groups on the basis of REE distribution patterns: one with LREE (Light Rare Earth Element) enriched pattern (Group I) and the other with flat REE pattern (Group II). A significant positive correlation among trace elements Nb, Zr, La, Ce for Group I dykes suggest variable degree of partial melting of the mantle source. In tectonic discrimination diagrams made with immobile incompatible trace elements Nb, Zr, Ti and Y, Group I dykes show arc-like geochemical signature while Group II dykes are similar to MORBs. Enrichment in some of the LILE and prominent depletion in Nb, P and Ti in Group I dykes suggest that the original melt was derived from a metasomatised mantle source. Group II dykes might derived from a MORB-type mantle source. Melting was triggered by volatiles in case of dykes of Group I while for the Group II dykes, melting was produced by thinning of the lithosphere and subsequent decompression.

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Fossil marginal bassin from the Indian shield: A model for the evolution of Singhbhum Precambrian belt, Eastern India

Cited by 42 publications

References 17 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

Newer Dolerite dykes, Jharkhand, India: a case study of magma generation, differentiation and metasomatism in a subduction zone setting

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