Volcano-sedimentary and metallogenic records of the Dharwar greenstone terranes, India: Window to Archean plate tectonics, continent growth, and mineral endowment

Manikyamba, C.; Ganguly, Sohini; Santosh, M.; Subramanyam, K.S.V.

doi:10.1016/j.gr.2017.06.005

Cited by 74 publications

(37 citation statements)

References 226 publications

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“…The banded gneiss represents the oldest granitoid magmatism in the study region. Arc related volcanic rocks like boninite, high‐Mg andesite, arc basalt, and Nb‐enriched basalt have been reported from different parts of the EDC (Manikyamba et al, ). The banded gneiss is sodic in nature with low contents of ferromagnesian elements (Cr, Ni, V, and Sc) and low Mg#, which indicate a mafic intracrustal source without any additional interaction with the mantle.…”

Section: Discussionmentioning

confidence: 99%

“…The period 2.5–2.4 Ga marked the stabilization of almost all Archaean cratons with intrusion of diverse granitoid plutons. Crustal growth in the eastern Dharwar craton (EDC) occurred from 2.7–2.5 Ga, and different authors have proposed different tectonic scenario on the EDC (Chadwick et al, ; Dey, ; Jayananda et al, , ; Manikyamba & Kerrich, ; Manikyamba, Ganguly, Santosh, & Subramanyam, ). Many changes have been documented across the Archaean–Proterozoic boundary, including mantle‐derived signatures, although these are often obscured due to major crustal mixing (Jayananda, Moyen, Peucat, Auvray, & Mahabaleswar, ).…”

Section: Introductionmentioning

confidence: 99%

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Neoarchaean magmatism through arc and lithosphere melting: Evidence from eastern Dharwar Craton

2019

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The Neoarchaean era is characterized by rapid crustal growth corresponding to some fundamental global changes in geodynamic processes. However, the nature of crustal growth including the mechanism and tectonic setting of the Neoarchaean are controversial issues. The eastern Dharwar Craton (EDC) exposes widespread Neoarchaean granite‐greenstone belts, which provide an opportunity to evaluate the various models proposed for Neoarchaean crustal growth. In this study, we present field, petrographic, and geochemical data and discuss the petrogenesis and significance for crustal evolution for a suite of previously undescribed banded gneisses, TTG (tonalite–trondhjemite–granodiorite), biotite granites, alkali feldspar granite and gabbro. These rocks are associated with Neoarchaean metavolcanic and metapelites rocks of the Tsundupalle greenstone belt, in the eastern fringe of the EDC. Whole‐rock major and trace element geochemical data are consistent with diverse sources, including both crust and enriched mantle in an evolving subduction zone. A convergent orogenic setting is proposed for interpreting the association of various granitoids in the Tsundupalle area. Finally, intrusion of crustally derived, highly silicic, alkali‐rich granite, and mantle‐derived gabbro emplaced in a post‐subduction regime is proposed. Lithospheric delamination and attendant mantle melting are suggested as possible mechanisms for generation of these rocks. The understanding of generation of the different granitoid types along with gabbro provides significant insights into the mechanism of Neoarchaean crustal growth.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Neoarchaean magmatism through arc and lithosphere melting: Evidence from eastern Dharwar Craton

2019

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“…The studies on the Phanerozoic island‐arc systems provide significant understanding about the magmatic and tectonic processes operative in subduction zones. The mantle wedge above a subduction zone in modern arc systems have been chemically modified and enriched by components from the subducting oceanic lithosphere including (i) fluid flux derived from dehydration of altered oceanic crust or subducted sediments and (ii) addition of melts of subducted slab sediments and basaltic crust (Kimura & Yoshida, ; Manikyamba, Ganguly, Santosh, & Subramanyam, ; McCulloch & Gamble, ; Tatsumi, ; Yogodzinski, Kay, Volynets, Koloskov, & Kay, ; Zhao & Zhou, ). Metasomatism and flux‐controlled partial melting of mantle wedge peridotites triggered by the subduction‐derived components including hydrous fluids, siliceous slab melts, and sediments from subducted oceanic lithosphere are widely accepted as fundamental processes for subduction zone magmatism in intraoceanic and continental arc regime (Kimura & Yoshida, ; Mullen & McCallum, ; vanKeken, Hacker, Syracuse, & Abers, ).…”

Section: Discussionmentioning

confidence: 99%

Geochemical characteristics of basalts from Andaman subduction zone: Implications on magma genesis at intraoceanic back‐arc spreading centres

et al. 2018

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This study reports new petrological and geochemical data for the ocean floor volcanic rocks dredged from the back‐arc basin of the Andaman Sea and elucidates their geochemical characteristics and petrogenetic aspects to provide insights into the melt generation processes, oceanic crust emplacement, and tectonomagmatic evolution of the Andaman back‐arc basin. The studied samples are porphyritic basalts with olivine, plagioclase, and clinopyroxene representing the phenocrysts and the groundmass composition marked by plagioclase microlites, granular clinopyroxenes, and glass. Geochemical characteristics of these basalts reflect sub‐alkaline, tholeiitic composition of precursor magma that experienced clinopyroxene‐Ti magnetite fractionation. The overall geochemical trend for these basalts reflects LILE–HFSE–REE depleted MORB‐type chemistry which is modified by input from subduction‐derived components. Pronounced enrichment in selected LREE (Nd) and incompatible fluid‐mobile trace elements like Ba with positive primitive mantle‐normalized La and Sr anomalies in the majority of these basalts are attributed to transport and influx of slab‐dehydrated fluids and sediments into the depleted back‐arc mantle asthenosphere from the dehydrating subducted oceanic lithosphere in the volcanic arc front during initial stage of back‐arc rifting in the Andaman Sea. The studied basalts were derived by 10%–30% partial melting of a heterogeneous spinel lherzolitic mantle at a shallow depth. The chemical heterogeneity of the spinel lherozolite source suggests an enrichment‐depletion history of back‐arc mantle correlatable with the transitional tectonic evolution of the back‐arc basin from an initial rifting to matured spreading stage. The depleted MORB‐type mantle (DMM) beneath a juvenile back arc experienced infiltration of fluids and subduction‐derived components (SDC) from proximal subducting oceanic slab that gradually diminished with increasing distance from the arc and progressive back‐arc spreading. The episodes of melt generation and magma genesis invoke a gradual geodynamic transition from incipient back‐arc rifting to matured back‐arc spreading stages in the tectonomagmatic evolution of the Andaman back‐arc basin system. Oceanic crust generated during the incipient rifting stage sampled arc‐type melts enriched and hydrated by subduction inputs and fluid flux, while oceanic crust formed during matured back‐arc extension stage inherited trace element depleted MORB‐type mantle signatures devoid of subduction influence.

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“…The eastern Dharwar Craton (EDC) is dominated by the Neoarchean granitic rocks known as Dharwar Batholith with minor TTGs and thin narrow elongated greenstone belts trending in the NNW‐SSE direction in north to N–S in the south (Chadwick, Vasudev, & Hegde, ; Jayananda et al, ). These greenstone belts represent a composite tectono‐stratigraphic terranes, accreted from plume‐derived and subduction‐derived volcanics comprising (a) minor komatiites, (b) high Mg–basalts, (C) andesites, (d) adakites, (e) rhyolites, and (f) lamprophyres (Jayananda et al, ; Manikyamba, Ganguly, Santosh, & Subramanyam, and references therein; Pandey et al, ). The Proterozoic rock successions of EDC constitute of mafic dike swarms, Cuddapah Basin, and potassic to ultrapotassic alkaline rocks (Chalapathi Rao, ; Chalapathi Rao, Miller, Pyle, & Madhavan, ; Chalapathi Rao, Miller, Gibson, Pyle, & Madhavan, ; Kumar, Heaman, & Manikyamba, , and references therein; Chalapathi Rao, Wu, et al, ).…”

Section: Regional Geologymentioning

confidence: 99%

Lithosphere–asthenosphere interaction and carbonatite metasomatism in the genesis of Mesoproterozoic shoshonitic lamprophyres at Korakkodu, Wajrakarur kimberlite field, Eastern Dharwar Craton, southern India

et al. 2019

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The spatial and temporal association between lamprophyres and kimberlites provides unique opportunities to explore their genetic relationships. This paper explores such a relationship by detailing mineralogical and geochemical aspects of Korakkodu lamprophyre dykes located within the well‐known Mesoproterozoic diamondiferous Wajrakarur Kimberlite field (WKF), towards the south‐western margin of Paleo–Mesoproterozoic Cuddapah Basin, Eastern Dharwar Craton, southern India. Mineralogy reveals that these dykes belong to calc‐alkaline variety of lamprophyres, but their geochemistry display mixed signals of both alkaline and calc‐alkaline lamprophyres. These lamprophyres are highly potassic, and their high Al2O3 and low‐TiO2 content implies a shoshonitic character. Low Mg#, Ni, and Cr concentration highlight their evolved nature. High (La/Yb)N and (Gd/Yb)N content is consistent with their derivation from low degrees of partial melting, whereas highly fractionated nature suggests the presence of garnet in their source. Absence of prominent Nb‐Ta anomaly implies to the dilution of lithospheric mantle source by melts rich in HFSEs and low La/Nb ratio compared to those of the calc‐alkaline island arc volcanics and suggests an asthenospheric overprint on lithospheric mantle source. Carbonatite metasomatism in the source region of these lamprophyres is apparent from conspicuously high‐Zr/Hf ratio, and the HFSE budget of these lamprophyres are principally controlled by the presence of phlogopite veins in their lithospheric source. An extremely heterogeneous and layered lithospheric mantle beneath Eastern Dharwar Craton has been inferred from the divergent genetic history of Mesoproterozoic lamprophyres and kimberlites in the Wajrakarur field.

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Volcano-sedimentary and metallogenic records of the Dharwar greenstone terranes, India: Window to Archean plate tectonics, continent growth, and mineral endowment

Cited by 74 publications

References 226 publications

Neoarchaean magmatism through arc and lithosphere melting: Evidence from eastern Dharwar Craton

Neoarchaean magmatism through arc and lithosphere melting: Evidence from eastern Dharwar Craton

Geochemical characteristics of basalts from Andaman subduction zone: Implications on magma genesis at intraoceanic back‐arc spreading centres

Lithosphere–asthenosphere interaction and carbonatite metasomatism in the genesis of Mesoproterozoic shoshonitic lamprophyres at Korakkodu, Wajrakarur kimberlite field, Eastern Dharwar Craton, southern India

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