Meso-Neoarchean magmatism and episodic crustal growth in the Kudremukh-Agumbe granite-greenstone belt, western Dharwar Craton, India

Pahari, Arijit; Tang, Li; Manikyamba, C.; Santosh, M.; Subramanyam, K.S.V.; Ganguly, Sohini

doi:10.1016/j.precamres.2019.01.005

Cited by 25 publications

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“…Viable models for lateral growth of Precambrian continental crust espouse accretion of arc magmas through subduction‐collision processes at active continental margins and accretion of island arc and oceanic plateaus to form microcontinents. However, mantle plume activities in terms of ocean island basalts (OIB), oceanic plateau basalts (OPB), continental flood basalts (CFB), and underplating of mantle‐derived melts beneath lower crust account for vertical crustal growth (Bédard, 2018; Condie, 1999; Manikyamba, Ganguly, Santosh, & Subramanyam, 2017; Pahari et al, 2019; Turkina & Nozhkin, 2003; Wyman, 2018). Precambrian mafic magmatism represents major thermal events in the evolutionary history of the earth with dynamic mantle melting and melt extraction processes that contributed to the crust generation mechanisms.…”

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confidence: 99%

Mafic volcanic rocks of western Iron Ore Group, Singhbhum Craton, eastern India: Geochemical evidence for ocean–continent convergence

et al. 2020

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Precambrian mafic magmatism is an important global episode which played a significant role in the crustal evolution. In India, Singhbhum Craton being the oldest craton, witnessed significant occurrences of Precambrian geological activity, marked by several episodes of volcanism, plutonism, sedimentation spanning from Palaeoarchean to Mesoproterozoic age. Here we present petrological and geochemical characteristics of Precambrian mafic volcanic rocks (occurring in western Iron Ore Group (IOG), Singhbhum Craton, eastern India) to evaluate their petrogenetic aspects, tectonic setting, and magma generation. The mafic volcanic rocks are porphyritic in nature with the phenocrysts of plagioclase and groundmass composed of clinopyroxene, plagioclase, ilmenite, and volcanic glass. These rocks are mostly tholeiitic, sometimes with a transitional behaviour towards calc‐alkaline nature and display basalt‐basaltic andesite affinity. These mafic volcanic rocks also preserve geochemical signatures (high Nb/U, Nb/La, [Nb/Th]pm ratios) in support of Nb‐enriched basalts and are classified as Nb‐enriched basalts (NEB; Nb > 7 ppm) and high‐Nb basalts (HNB; Nb > 20 ppm) on the basis of Nb concentrations and mantle normalized Nb/La ratios (>0.5). The NEBs and HNBs are marked by lesser magnitude of negative Nb anomalies with high (Nb/Th)pm, (Nb/La)pm, and Nb/U ratios as compared to normal arc basalts. Several major element oxides, trace elements, and selected element ratios (like SiO2, CaO/Al2O3, Y, V/Cr, Zr/Nb, and ∑REE) show systematic variations with MgO which suggests role of magmatic fractionation. Chondrite‐normalized REE patterns for NEB and HNB rocks exhibit uniform LREE enrichment with distinct Eu negative anomalies while primitive mantle‐normalized incompatible trace element patterns reflect enrichment in LILE and LREE with prominent Nb‐Ta anomalies. Different HFSE ratios corroborate a subduction related setting for magma generation formed by ∼10%–20% melting in the domain of garnet lherzolite. Relative enrichment of LILE and LREE with depleted HFSE characteristics attest a garnet‐bearing mantle source and melt extraction with garnet in the residue. Geochemical signatures suggest that the genesis of NEB and HNB is attributable to slab‐melting and wedge hybridization processes during matured stages of subduction. Selected incompatible trace element ratios for the studied mafic volcanic rocks invoke an enriched (EM1‐EM2 type) mantle source and unequivocally suggest effects of continental crustal assimilation of the parent magma. Liquid immiscibility has played an important role as a differentiation mechanism leading to presence of high and low FeO types. The IOG mafic volcanic rocks preserve distinct geochemical signatures of matured stage of subduction, slab melting, crustal contamination and magma generation at an Archean ocean–continent convergent margin setting.

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Section: Introductionmentioning

confidence: 99%

Mafic volcanic rocks of western Iron Ore Group, Singhbhum Craton, eastern India: Geochemical evidence for ocean–continent convergence

et al. 2020

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“…Ganguly et al (2019) evaluated the geochemical signatures of komatiites from Mesoarchean Sargur Group and Neoarchean Dharwar Supergroup greenstone belts of Dharwar Craton, corroborated possible proponents for Archean upper mantle hydration and suggested a gradual temporal transition of mantle characteristics during Meso-Neoarchean times. Recently, Pahari et al (2019) have reported U-Pb zircon age and detailed geochemistry of the island arc basalts and Nb-enriched basalts from the Kudremukh greenstone belt of western Dharwar Craton which were erupted at 2498+43 Ma and these are geochemically similar with the Phanerozoic counterparts. The arc basalts were generated by the melting of subcontinental lithospheric mantle wedge 40 C Manikyamba and Sohini Ganguly with the influence of slab derived fluids and the Nb enriched basalt are formed due to melting of slab and subsequent fluid fluxed metasomatism and melt fluxed hybridization.…”

Section: Greenstone Belts: Volcano-sedimentary Sequencesmentioning

confidence: 99%

“…The dykes intruding into the volcano-sedimentary sequences of the Kudremukh belt of the western Dharwar Craton have been studied for their geochemical and zircon U-Pb geochronology which gave the emplacement age of 2484+29 Ma. The geochemical characteristics of amphibolitic and doloritic dykes reflect on post subduction collisional event in this part of WDC (Pahari et al, 2019). Soderlund et al (2018) reported eighteen new U-Pb baddeleyite ages of mafic dykes with varying trends, comprising the most prominent and extensive swarms from the eastern Dharwar Craton (EDC).…”

Section: Dyke Swarmsmentioning

confidence: 99%

“…The heat and fluid flux associated with sanukitoid magmas caused lower to mid crustal melting resulting in anatectic granites (Jayananda et al, 2018). Further, the U-Pb zircon geochronology of the TTG from the Kudremukh greenstone belt indicate their age 3068+34 Ma and the whole rock geochemical signatures reflect that they were generated through high pressure melting of mafic crust in a garnet spinel peridotite mantle regime with the assimilation of upper crustal material in a subduction zone environment (Pahari et al, 2019).…”

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Annals of Precambrian Lithospheric Evolution and Metallogeny in the Dharwar Craton, India: Recent Paradigms and Perspectives

Manikyamba¹,

Ganguly²

2020

PINSA

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This article brings out a comprehensive overview of the scientific studies that have been executed in different parts of Dharwar Craton during last four years 2016-2020. Recent trends of research and scientific perspectives have emphasized on integrated approaches involving a wide spectrum of geochemical, isotopic and geochronological proxies to address fundamental questions in the Dharwar Craton on Precambrian evolution of the earth, episodes and mechanisms of crust generation and the mantle dynamics. The excellent preservation of Precambrian lithologies including basement gneisses, volcano-sedimentary sequences of greenstone belts, granitoid plutons, ultramafic-mafic complexes, ultrapotassic magmatism and dyke swarms in the Dharwar Craton have provided an opportunity for understanding the geodynamic transitions in the secular evolution of the Earth. A four year status report including the principal lithological associations of Dharwar Craton have been described in this communication detailing the scientific investigations and their implications are brought out under various sections. The salient aspects of the scientific contributions on granite-greenstone terranes of Dharwar Craton emphasising on geochronology, geochemistry, biogeochemical processes, geodynamics and mineralization.

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Neoarchean arc‐back arc subduction system in the Indian Peninsula: Evidence from mafic magmatism in the Shimoga greenstone belt, western Dharwar Craton

Singh

Santosh

et al. 2020

Geological Journal

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The Neoarchean Shimoga greenstone belt (SGB) of western Dharwar Craton is dominated by ultramafic‐mafic‐felsic magmatic suite and sedimentary rocks. Here, we investigate the mineral chemistry and whole‐rock geochemistry of the Koppa–Herambapura mafic magmatic rocks (tholeiitic metagabbro and metabasalt) from the southern SGB in order to understand their petrogenesis and geodynamic implication. The geochemical features classify the Shimoga rocks as basaltic‐basaltic andesite with a sub‐alkaline tholeiitic signature. Both the rock types display uniform depletion in HFSE relative to LILE‐LREE, higher LILE/HFSE, and LREE/HFSE ratios (La/Nb = 1.30–8.07, Nb/Ta = 11.58–16.19, Zr/Sm = 10.24–29.77) and negative Nb–Ta, Zr–Hf, and Ti anomalies in multi‐element patterns, corresponding to magmatic arc rocks generated within intraoceanic subduction environment. Their Nb/Th (2–15), Zr/Sm (10–29), and Zr/Hf (44–233) ratios indicate a depleted to enriched mantle source, and the parental magma of the mafic rock suite was generated by low to medium degrees (~8–30%) of mantle melting at depths corresponding to spinel to garnet peridotite fields of arc‐back arc setting. Our field and analytical data suggest that the tholeiitic metagabbros were derived from depleted mantle source generated in an arc environment, whereas the metabasalts had a mantle source attributed to (a) development of juvenile back‐arc rift; (b) upwelling of MORB‐like mantle; and (c) flux‐induced melting in the compositional domain of spinel‐garnet peridotite. Based on these results, we conclude that the mafic rock suite from the southern SGB possibly marks one of the earliest Neoarchean arc‐back arc subduction in the western Dharwar Craton.

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Meso-Neoarchean magmatism and episodic crustal growth in the Kudremukh-Agumbe granite-greenstone belt, western Dharwar Craton, India

Cited by 25 publications

References 165 publications

Mafic volcanic rocks of western Iron Ore Group, Singhbhum Craton, eastern India: Geochemical evidence for ocean–continent convergence

Mafic volcanic rocks of western Iron Ore Group, Singhbhum Craton, eastern India: Geochemical evidence for ocean–continent convergence

Annals of Precambrian Lithospheric Evolution and Metallogeny in the Dharwar Craton, India: Recent Paradigms and Perspectives

Neoarchean arc‐back arc subduction system in the Indian Peninsula: Evidence from mafic magmatism in the Shimoga greenstone belt, western Dharwar Craton

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