Experimental studies to constrain parental magma of Malangtoli volcanics from Singhbhum craton of the eastern Indian shield

Alvi, Shabber Habib; Ray, Jyotishankar

doi:10.1007/s12594-016-0483-9

Cited by 8 publications

(3 citation statements)

References 13 publications

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“…The IOG volcanic rocks are modelled to have been derived by <1-1% partial melting of garnet lherzolite whereas the Malangtoli basalts were generated by 3 -<10% partial melting from spinel to garnet lherzolite. Banerjee et al (2016), on the basis of tectonic discrimination diagrams, supported the idea that the Malangtoli Volcanics have island arc tholeiitic affinity and were erupted in a supra-subduction setting. Their experimental work suggests crystallization of the parental magma at temperatures ranging from 1500ºC to 1200ºC.…”

Section: Malangtoli and Jagannathpur Volcanicsmentioning

confidence: 59%

The Architecture and Evolution of the Singhbhum Craton

Mukhopadhyay

Matin

2020

Episodes

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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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Section: Malangtoli and Jagannathpur Volcanicsmentioning

confidence: 59%

The Architecture and Evolution of the Singhbhum Craton

Mukhopadhyay

Matin

2020

Episodes

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“…The IOG volcanic rocks are modelled to have been derived by <1-1% partial melting of garnet lherzolite whereas the Malangtoli basalts were generated by 3-<10% partial melting from spinel to garnet lherzolite. Banerjee et al (2016), on the basis of tectonic discrimination diagrams, supported the idea that the Malangtoli Volcanics have island arc tholeiitic affinity; in other words they were erupted in a suprasubduction setting.…”

Section: Malangtoli and Jagannathpur Volcanicsmentioning

confidence: 60%

Recent Studies on the Singhbhum Craton

Mukhopadhyay¹,

Matin²

2020

PINSA

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“…The stratigraphic status and age of these sequences are controversial due to the lack of geochronological data. Among them, the Malangtoli volcanic rocks are exposed to share a tectonic contact with the Banded Iron Formation (BIF) of IOG and cover an area of over 800km 2 to the west of Keonjhargarh town between Malangtoli (21˚45'N: 85˚15'E) in the north and Pala Lahara (21˚28'N: 85˚15'E) in the South (Figure 1B, C; Banerjee et al, 2016;Bose, 2009;Ray et al, 2006;Saha, 1994). Along the Southern boundary of Malangtoli lavas, the gently southwardly dipping quartzite-sandstone with pebble beds overlie the lavas on an unconformity.…”

Section: Geological Settingsmentioning

confidence: 99%

Geochemistry of Khandadharpahar-Thakuranipahar metabasites from the western Singhbhum Craton, eastern India: implications for subduction-zone tectonics and mantle-wedge metasomatism

Rajani

2022

GeA

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The identification of new rock types in the volcano-sedimentary sequences of the Singhbhum Craton has attractedmuch attention in recent years. The present study deals on newly identified Nb-Enriched Basalts (NEB) from theKhandadharpahar-Kadakala-Thakuranipahar (KKT) section, western Singhbhum Craton, which is comparablein composition to basalts-basaltic andesites and calk-alkaline in character. These metabasites have a porphyritictexture with phenocrysts of pyroxene and plagioclase, as well as a groundmass that has metamorphosed to thegreenschist facies. High Nb contents (7.5-22.8ppm) combined with high (Nb/Th)PM (0.28-0.59), (Nb/La)PM (0.40-0.69) and Nb/U (11.7-34.4) ratios, compared to arc basalts ((Nb/Th)PM= 0.10-1.19; (Nb/La)PMn 0.17-0.99, Nb/U<10), characterized them as NEB. Negative Nb, Zr, Hf and Ti anomalies, and Nb/Th vs La/Nb and Th/Nb vs. La/Sm relationships, collectively indicate typical arc volcanics. The available geochemical parameters suggest a genesisof KKT metabasites through i) slab melt migration from the downgoing oceanic crust, ii) low-degree melting ofthe garnet-bearing peridotite in the mantle wedge metasomatized by the slab melts, iii) slab melt - peridotiteinteraction triggering increasing Nb concentrations and iv) NEB generation in an arc-related environment. Thediscovery of KKT NEB sheds new information on Paleoproterozoic subduction-zone processes and crustal growthin the Singhbhum craton.

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Experimental studies to constrain parental magma of Malangtoli volcanics from Singhbhum craton of the eastern Indian shield

Cited by 8 publications

References 13 publications

The Architecture and Evolution of the Singhbhum Craton

The Architecture and Evolution of the Singhbhum Craton

Recent Studies on the Singhbhum Craton

Geochemistry of Khandadharpahar-Thakuranipahar metabasites from the western Singhbhum Craton, eastern India: implications for subduction-zone tectonics and mantle-wedge metasomatism

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