Geochemical constraints on the tectonic setting of the Sonakhan Greenstone Belt, Bastar Craton, Central India

Deshmukh, S. D.; Hari, K.R.; Diwan, Prabhat; Prasanth, M.P. Manu

doi:10.1007/s11631-017-0213-z

Cited by 6 publications

(10 citation statements)

References 48 publications

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“…They considered the pillow basalts of SGB as the lower unit (LB‐1) and proposed that that particular sequence was plume‐derived and the upper mafic and felsic volcanic rock units were related to an island arc setting. Deshmukh et al () proposed that the pillow basalts and metabasalts of the SGB (LB‐2) exhibit low Nb/La (0.45 wt%), Ti/Y (252.3 wt%), Ti/V (20.5 wt%), TiO 2 (0.77 wt%), Ta (0.52 wt%), and Nb (1.3 wt%), which are akin to depleted magma source modified by dehydration of the subducting slab in SSZ. As proposed by Mondal and Raza, if we consider the OIB magmas in the genesis of SGB rocks, then those rocks should exhibit high HFSE abundances (e.g.…”

Section: Discussionmentioning

confidence: 93%

“…The initial decompression melting and the resulting upwelling of the MORB‐like lavas in the forearc environment resulted to the formation of lower pillow basalts (LB‐1; Mondal & Raza, ) in the SGB. Subduction‐derived minor fluids and MORB‐related melts collectively attributed to the formation of LB‐2 samples (Deshmukh et al, ). Further, continued subduction, slab dehydration, and hydrous fluxing liberated the LREE‐ and LILE‐enriched fluids, which induced partial melting of the depleted mantle wedge.…”

Section: Discussionmentioning

confidence: 99%

“…Subduction-derived minor fluids and MORB-related melts collectively attributed to the formation of LB-2 samples (Deshmukh et al, 2017). • The whole-rock geochemistry, mineral chemistry of clinopyroxenes, and chromites depict SSZ in the SGB.…”

Section: Figure 14mentioning

confidence: 99%

“…The Neoarchean Sonakhan greenstone belt (SGB), located in the north-eastern Bastar Craton of Central India, is mainly composed of metavolcanic and metasedimentary sequences. Mondal and Raza (2009) proposed a plume-arc interaction process for the genesis of SGB, whereas Deshmukh, Hari, Diwan, and Prasanth (2017) and Manu Prasanth, Hari, Chalapathi Rao, Hou, and Pandit (2017) considered the SGB as a subduction-accretion complex. However, no detailed geochemical studies were carried out in the ultrabasic rocks exposed in the southern part of the SGB.…”

Section: Introductionmentioning

confidence: 99%

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Neoarchean suprasubduction zone magmatism in the Sonakhan greenstone belt, Bastar Craton, India: Implications for subduction initiation and melt extraction

et al. 2018

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The Neoarchean Sonakhan greenstone belt (SGB) in the north‐eastern Bastar Craton is mainly composed of an association of pillowed and massive tholeiitic basalts emplaced within an intraoceanic environment. Two types of ultrabasic rocks were identified and are designated as TH‐1 and TH‐2 on the basis of geochemical parameters. Both sample suites exhibit depletion of HFSE with reference to LILE and LREE, LREE/HFSE ratios, and negative Nb–Ta–Ti anomalies in the primitive mantle‐normalized multi‐element diagrams. The geochemical characters of TH‐1 and TH‐2 are consistent with Island arc tholeiites (IAT) and boninite‐like rocks of both Archean and Phanerozoic terranes. Mineral chemistry of clinopyroxenes from both volcanic suites indicate an oceanic arc affinity. The chromite chemistry indicate its derivation from a boninite‐like magma in a suprasubduction zone (SSZ) environment. Trace element modelling depicts that source depletion with significant influence of fluids derived from the subducting oceanic slab collectively controlled the trace element inventory of the mantle wedge, which result to the higher abundance of LREE and LILE compared to HREE and HFSE. The occurrence of lower basalt sequence followed by IAT and boninite‐like rocks in the SGB define a magmatic evolution which is comparable to the Phanerozoic ophiolite suites that exhibit subduction initiation prior to forearc rifting and suprasubduction zone magmatism. The subduction initiation in the intraoceanic lithosphere and the initial decompression melting followed by the upwelling of the MORB‐related magmas were attributed to the formation of the lower pillow basalts. Dehydration of the subducting plate and the melt extraction processes in the hydrous lherzolite mantle wedge account for the formation of TH‐1. Subsequent depletion and significant modification of a more refractory harzburgite source by the slab‐derived fluids generated the TH‐2 rocks. The compositionally diverse magmatic imprints with IAT and boninite affinity in the SGB indicate the significance of episodic melt extraction processes, dehydration of the subducting plate, and hydrous fluxing in SSZ tectonic setting.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Figure 14mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Neoarchean suprasubduction zone magmatism in the Sonakhan greenstone belt, Bastar Craton, India: Implications for subduction initiation and melt extraction

et al. 2018

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“…The whole‐rock geochemical studies of the host granites from this study, and the mineral chemistry of the biotites from the MEs (Figure c,d), conclusively suggest the volcanic arc signatures (Figure ). The volcanic sequences from the adjacent Sonakhan greenstone belt have also been emplaced in a subduction environment (Deshmukh, Hari, Diwan, & Prasanth, ; Manu Prasanth, Hari, Chalapathi Rao, Hou, & Pandit, ), thus suggesting that the volcano‐sedimentary sequences and associated granites of Sonakhan belt are also derived due to subduction, similar to that of Kotri belt. All these observations thus confirm the existence/operation of plate tectonics was more active in Central India than assumed earlier during the Archean/Proterozoic transition.…”

Section: Discussionmentioning

confidence: 99%

Magma chamber processes and geodynamic implications of the Pithora pluton, Bastar Craton, Central India

et al. 2019

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The interaction between the coeval mafic and felsic magmas result in mixing, mingling, and chemical exchanges between both the end‐member magmas. We document the features relevant to the magma chamber processes and quantify the extent of mixing by means of detailed field, petrographic, mineral, and whole‐rock geochemistry from one of the less known granitic plutons from the Pithora region that forms part of the Kanker granite, Bastar Craton. The study area is composed of granite, granodiorite (mixed zone), and quartz diorite microgranular enclaves (MEs). The occurrence of syn‐plutonic mafic dykes, cuspate contact, magmatic flow textures, and hybridization suggest the coeval emplacement of end‐member magmas. Petrographic evidence such as disequilibrium textures such as resorption, quartz ocelli, and spikes in plagioclase, acicular apatites, and mafic clots are formed by magma mixing. Plagioclase from MEs and the mixed region exhibit disequilibrium textures such as normal, reverse, and oscillatory zoning suggestive of magma mixing. Whole‐rock geochemical data indicates the metaluminous to peraluminous host granites and metaluminous ME. The broadly linear trend of geochemical variation diagrams for these granitoids and MEs showcase the hybridization of two end‐member magmas. The mineral chemistry of the biotites and hornblende show subduction affinity, being further constrained by whole‐rock trace elemental systematics. The granitoids of Pithora region were formed in a subduction setting where large‐scale mantle‐ and crustal‐derived magmas were generated and subsequently mixed at crustal emplacement level.

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Platinum‐group element and Au geochemistry of an ultramafic intrusion from the Sonakhan greenstone belt, Bastar craton, Central India: Tectono‐magmatic implications

et al. 2021

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The Sonakhan greenstone belt (SGB), located in the north‐eastern Bastar craton of the Indian shield, comprises mafic‐ultramafic and volcanic‐intrusive sequences in the lower stratigraphic units. We investigate the Platinum‐group element (PGE) relations of Boradih intrusion of the SGB to evaluate its tectono‐magmatic evolution. The chondrite‐normalized PGE patterns of boninitic cumulate rocks exhibit higher abundance of Palladium group PGEs (∑PPGE = 292–496 ppb) relative to the Iridium group PGEs (∑IPGE = 32–52 ppb) along with variable Au concentrations (51.34–718.05 ppb). The PGE concentrations are attributed to a boninitic parental melt, where the IPGEs in the source possibly partitioned into a monosulphide solid solution. The Cu (22–80 ppm), elevated Pt (22–238 ppb), and Pd (31–377 ppb) concentrations indicate Pt and Pd have partitioned into a semi‐metal rich melt during the later stages of crystallization. The geochemical characteristics of the basalts and ultramafic cumulates of the SGB indicate a supra‐subduction zone tectonic setting for its formation. Similar geochemical and litho‐tectonic correlations are also noticed between the SGB of Bastar craton and greenstone belts of the Eastern Dharwar craton of south India. The SGB (V/Yb =146 ± 25) and greenstone belts of Eastern Dharwar craton (V/Yb = 134 ± 52) record similar oxidation conditions of Phanerozoic subduction zones. Accordingly, we propose magmatic as well as tectonic correlations are possible for the Archean‐Palaeoproterozoic Bastar and Eastern Dharwar cratons.

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Geochemical constraints on the tectonic setting of the Sonakhan Greenstone Belt, Bastar Craton, Central India

Cited by 6 publications

References 48 publications

Neoarchean suprasubduction zone magmatism in the Sonakhan greenstone belt, Bastar Craton, India: Implications for subduction initiation and melt extraction

Neoarchean suprasubduction zone magmatism in the Sonakhan greenstone belt, Bastar Craton, India: Implications for subduction initiation and melt extraction

Magma chamber processes and geodynamic implications of the Pithora pluton, Bastar Craton, Central India

Platinum‐group element and Au geochemistry of an ultramafic intrusion from the Sonakhan greenstone belt, Bastar craton, Central India: Tectono‐magmatic implications

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