Platinum-group element geochemistry of boninite-derived Mesoarchean chromitites and ultramafic-mafic cumulate rocks from the Sukinda Massif (Orissa, India)

Mondal, Sisir K.; Khatun, Sarifa; Prichard, Hazel Margaret; Satyanarayanan, M.; Kumar, G. R. Ravindra

doi:10.1016/j.oregeorev.2018.11.027

Cited by 26 publications

(9 citation statements)

References 75 publications

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“…Dominance of the Os-Ir-Ru alloys suggestive crystallization at high temperature and low fS 2 within a S-under saturated boninitic magma ascending from the upper mantle. This study reveals potential for PGE mineralization in the Sukinda area, possibly an extension of the neighboring Baula-Nuasahi area (Mondal et al, 2019).…”

Section: Chromite and Pge Oresmentioning

confidence: 76%

“…The layered ultramafic unit in the Mesoarchean Sukinda Massif comprises serpentinized dunite, orthopyroxenite and chromitite, apart from brecciated ultramafic rocks cemented by gabbro-granodiorite clasts. The positive correlation between MgO and Ni, and MgO and Cr in these rocks is due to fractionation of early cumulus olivine/chromite from the high-Mg parental magma (Mondal et al, 2019). While the correlation between Zr and Cu suggests that the parental boninitic magma was S-under saturated, the flatter trend in the Zr-Cu plot from the matrix gabbro indicates sulfide saturation to have occurred later in the evolved boninitic magma.…”

Section: Chromite and Pge Oresmentioning

confidence: 88%

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Magmatic and Hydrothermal Ore Deposits

Mishra¹

2020

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This article briefly reviews all contributions by Indian geoscientists between the period 2015 and 2019, in the field of magmatic and hydrothermal ore deposits. The contributions covered are mainly on deposits and prospects of chromite, PGE, gold and uranium. Very few contributions have been made on base metals. However, experimental sulfide phase equilibrium research, related to metamorphic remobilization of massive sulfides, has continued with its modest initiation.

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Section: Chromite and Pge Oresmentioning

confidence: 76%

Section: Chromite and Pge Oresmentioning

confidence: 88%

Magmatic and Hydrothermal Ore Deposits

Mishra¹

2020

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“…The ultramafic rocks are picrite, lherzolite, orthopyroxenite, harzburgite, dunite and chromitite and characteristically show adcumulate texture. The parent magma is boninitic or siliceous high-Mg basalt (SHMB) (Mondal, 2009;Khatun et al, 2014;Mondal et al, 2019). The spidergrams of trace elements in gabbro samples show negative Nb, Th, Zr, and Hf anomalies indicating derivation from a depleted mantle (Mondal and Zhou, 2010).…”

Section: Ultramafic-mafic-anorthosite Suitesmentioning

confidence: 99%

The Architecture and Evolution of the Singhbhum Craton

Mukhopadhyay

Matin

2020

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The Singhbhum Craton is built up by successive pulses of discrete granitic magmatism at ~3.52 Ga, Ga that produced tonalitetrondhjemite-granodiorite (TTG)-type suites and were followed by younger pulses at 3. Ga producing voluminous granitic-granodioritic magma. There is enough evidence to indicate that continental crust building activity started in the Hadean time and continued through Eoarchean. But the rocks of this period were fully recycled to generate the Paleoarchean and younger crust. The different pulses of granitic magmatism during the Paleoarchean were interspersed with the formation of supracrustal rocks which are now preserved as supracrustal belts peripheral to the craton or as internal screens within the craton. Halfnium isotopic record suggests that the Hadean and Eoarchean granitoids were sourced in an enriched reservoir, probably some form of early mafic protocrust. From ~3.6-3.5 Ga a shift in the isotopic composition of Hf is noticed, marked by upward excursion of ε Hf(t) plots towards suprachondritic values, signifying that the early mantle reservoir was serially modified by contamination by a juvenile melt derived from a depleted source. This probably signals a change in the geodynamic scenario, major depletion of the mantle and generation of voluminous TTG melts. There are contending hypotheses of plume-driven and subduction-driven mechanisms of continental crust formation. In the Singhbhum Craton during Hadean and Eoarchean times episodic mantle plumes probably operated in a stagnant lid tectonic setting. Repeated plume activities and the formation of oceanic plateaus might have triggered the onset of subduction which at the initial stages might have been of short duration. The transition from plume-driven tectonics to subduction-driven tectonics might have taken place at about 3.5 Ga. The supracrustal belts of the Older Metamorphic Group (OMG) and the Iron Ore Group (IOG) are thought to have formed in supra-subduction settings. Widespread metamorphism and deformation affected the craton during 3.34-3.26 Ga. By 3.1 Ga the Singhbhum Craton had stabilized and emerged as a landmass. Paleosols developed on the surface; rift basins were formed which were receptacles of siliciclastic sediments and mafic volcanics; anorogenic K-feldspar bearing granites were emplaced. Swarms of mafic dykes of Paleo-to Meso-Proterozoic age intruded the craton marking a tensional regime that was probably related to the initial stage of basin formation in the North Singhbhum Mobile Belt.

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“…The ultramafic rocks are picrite, lherzolite, orthopyroxenite, harzburgite, dunite and chromitite and characteristically show adcumulate texture. The parent magma is boninitic or siliceous high-Mg basalt (SHMB) (Khatun et al, 2014;Mondal, 2009, Mondal et al, 2019. The geochemistry and REE patterns suggest that the boninitic parental magma was generated by second-stage melting of a metasomatized depleted mantle source in a supra-subduction setting.…”

Section: Ultramafic-mafic-anorthosite Suitesmentioning

confidence: 99%