Sisir Kanti Mondal

Jadavpur University | JU · Department of Geological Sciences

The Deccan basalts from the Kumbharli, Nadlapur, Bijaynagar, Hazarmacchi and Surli Ghat sections (surface samples) and the Koyna borehole-7 (KBH-7, subsurface samples) from Maharashtra (western India) demonstrate a two-stage crystallization process. Olivine and chromite were crystallized earlier in a shallow crustal magma chamber while clinopyroxen...

In the Archean Gorumahishani greenstone belt (~120 km) of the Singhbhum Craton, the komatiitic suite of rocks (~3.51Ga) is present at the lower part of the metamorphosed volcano-sedimentary sequence. The lower adcumulate zone (~28 m) of the komatiitic sequence is represented by meta-dunite whereas meta-peridotite is manifested in the spinifex zone...

The metamorphosed ultramafic-mafic bodies of the Kudada area are located close to the Singhbhum Shear Zone (SSZ) in Eastern India, where the major rock types are talc-magnesite schist and serpentinite with accessory chromite and magnetite veins. The ultramafic bodies and associated metavolcanic rocks are part of the northern extension of the Early...

It is well established that the major and minor element contents of chromites are subject to change during greenschist to amphibolite facies metamorphism. During upper amphibolite facies metamorphism, chromite can be completely converted to chrome magnetite. However, not all elements are affected to the same degree, the concentrations of +2 ions (e...

The well-preserved exposures of pillow basalts from the late Archean (2.7 Ga) Chitradurga greenstone belt (Western Dharwar Craton) have been studied in detail using petrological, bulk-rock geochemical and isotope data. The pillows are compositionally basalts to basaltic andesites, and constituted of actinolite and plagioclase. The pillows show slig...

Dolerite dyke swarms are widespread within the Singhbhum Craton (eastern India) that emplaced from the Neoarchean to Paleoproterozoic era just after the stabilization of crust before c. 3 Ga. These dyke swarms are oriented in NE - SW to NNE - SSW, NW - SE to WNW - ESE, E - W, and N - S directions. The WNW - ESE trending c. 1.77 Ga Pipilia dyke swar...

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https://2021.goldschmidt.info/goldschmidt/2021/meetingapp.cgi/Paper/3585

The Shankaraghatta ultramafic-mafic suite of rocks (12 x 0.3 km) within the late Archean Shimoga greenstone belt (Western Dharwar Craton, southern India) is constituted of sulfide-bearing serpentinized dunite flanked by metabasaltic schist rocks, which are probable analogues of the adcumulate-mesocumulate sheet flows in a komatiitic sequence, flank...

The Archean Mayurbhanj mafic complex in the Singhbhum Craton (eastern India) contains a magmatic Fe-Ti-(V) oxide ore deposit within a gabbro-norite-anorthosite suite of rocks. Immediate country rocks belong to the early Archean Gorumahisani greenstone belt and 3.1 Ga granitic complex. The gabbro-noritic rocks of the Mayurbhanj complex consist of pl...

This special issue in Lithos is focused on recent insights into the origin and evolution of the continental mantle lithosphere. The papers collectively grouped in this thematic issue employed petrological, mineralogical, geochemical and geophysical tools to unravel the architecture and evolution of the subcontinental lithospheric mantle (SCLM) and...

The chromite and magnesite deposits from Talur, Sindhuvalli, and Doddakanya in the layered ultramafic-mafic plutonic sequence are a part of the Archean Sargur greenstone belt within the Western Dharwar Craton of the Indian shield. The ultramafic bodies in these three areas are highly sheared and comprise of serpentinized dunite with chromitite bodi...

The Deccan basalt erupted at the K-T boundary and comprises multiple flow units with spatial variations in physiography and geochemistry. The Koyna borehole-7 (KBH-7 of MoES-BGRL) of the Koyna Seismic Zone is situated in the western part of the Deccan continental flood basalt province, where the lava pile is 1251 m thick. Thirty-one samples of four...

Laser ablation MC-ICP-MS was used to measure the Os-isotope compositions of single sulfide grains, including laurite (RuS2) and pentlandite [(Fe,Ni)9S8], from two chromitite bodies and host lherzolites from ophiolites of North Andaman (Indo-Burma-Sumatra subduction zone). The results show isotopic heterogeneity in both laurite (n = 24) and pentland...

Based on trend, cross-cutting relationships and U-Pb dating, Precambrian mafic dykes in the Singhbhum craton, earlier collectively identified as ‘Newer Dolerite Swarm’, have been separated into seven distinct swarms, which are thought to be the plumbing systems for Large Igneous Provinces (LIPs). These Singhbhum swarms range in age from∼2.80 Ga to∼...

http://13ips.com/wp-content/uploads/2018/07/13IPS-Abstract-Volume.pdf

Palladium concentrations of 1–3 ppm with an average Pt/Pd ratio of 0.15 have been located for the first time in a magnetitite layer in the Nuasahi Massif in Orissa India. This layer occurs at a high stratigraphic level in the complex and is nearly 4-km long and 5–12-m thick. The sections of the Pd-rich zone identified to date extend over a distance...

We investigate the microtextural–chemical features of partially serpentinized harzburgites from the lower ultramafic unit of the Mesoarchean Nuasahi Massif, eastern India, in order to understand the role of reacting fluid composition and temperature on the phase evolution across replacement interfaces during progressive alteration. Two distinct typ...

We present a detailed investigation of the micrometer- to nanometer-scale textural–chemical features in partially serpentinized dunites from the lower ultramafic unit of the Mesoarchean Nuasahi Massif, eastern India; these data are used to interpret the evolution in fluid chemistry at the reaction interface during progressive hydration of olivine....

The 3.1 Ga Nuggihalli greenstone belt in the Western Dharwar craton is comprised of chromitite-bearing sill-like ultramafic–mafic rocks that are surrounded by metavolcanic schists (compositionally komatiitic to komatiitic basalts) and a suite of tonalite–trondhjemite–granodiorite gneissic rocks. The sill-like plutonic unit consists of a succession...

This study investigates Cr isotope fractionation during soil formation from Archean (3.1–3.3 Ga) ultra-mafic rocks in a chromite mining area in the southern Singhbhum Craton (Orissa, India). The Cr-isotope signatures of two studied weathering profiles, range from non-fractionated mantle values to negatively fractionated values as low as d 53 Cr = À...

The Mesoarchean Nuasahi Massif in eastern India comprises a lower ultramafic and an upper gabbro unit. The lower unit consists of orthopyroxenite, harzburgite, dunite and three chromitite bands. All these rocks are characterized by adcumulate textures. The upper unit consists of gabbro with magnetite layers. At the contact between the eastern ortho...

Nuggihalli greenstone belt is one of the oldest greenstone belts (3.4–3.0 Ga) in the Western Dharwar craton, southern India. It consists of conformable metavolcanic (e.g., komatiite and komatiitic basalt) and metasedimentary rocks belonging to the Sargur Group. Sill-like ultramafic–mafic plutonic bodies are present within these schistose rocks whic...

Platinum group elements (PGE: Os, Ir, Ru, Rh, Pt, Pd) are important geochemical and cosmochemical tracers. Depending on physical and chemical behaviour the PGEs are divided into two subgroups: IPGE (Ir, Os, Ru) and PPGE (Pd, Pt, Rh). Platinum group elements show strong siderophile and chalcophile affinity. Base metal sulfides control the PGE budget...

The chromite deposits in the Archean Nuggihalli schist belt are part of a layered ultramafic–mafic sequence within the Western Dharwar Craton of the Indian shield. The 3.1-Ga ultramafic–mafic units occur as sill-like intrusions within the volcano-sedimentary sequences of the Nuggihalli greenstone belt that are surrounded by the tonalite–trondhjemit...

Boninite-norite (BN) suites emplaced in an intracratonic setting in Archaean Cratons, are reported from many parts of the world. Such high-Mg low-Ti siliceous rocks are emplaced during Neoarchaean-Paleoproterozoic. The Archaean central Indian Bastar Craton also contains such a boninite-norite suite, which occurs in the form of dykes and volcanics....

Chromite is an important accessory phase in ultramafic-mafic rocks and because of its robust nature it can be used as an efficient guide to understand the tectonomagmatic evolution and crust-mantle processes that operate in the Earth. Composition of chromite is highly sensitive to parent melt composition which is generated in different tectonic set...

Layered ultramafic-mafic rocks with chromitite bodies occur as sill-like intrusions within the Archean greenstone sequences of the Nuggihalli belt, Western Dharwar Craton. The 3.1Ga chromitite-bearing ultramafic-mafic rocks occur as dismembered en echelon, lenticular units that are conformable within the metasedimentary rocks, and surrounded by the...

The Mesoarchean Nuasahi chromite deposits of the Singhbhum Craton in eastern India consist of a lower chromite-bearing ultramafic unit and an upper magnetite-bearing gabbroic unit. The ultramafic unit is a ∼5km long and ∼400m wide linear belt trending NNW-SSE with a general north-easterly dip. The chromitite ore bodies are hosted in the dunite that...

Archean granite-greenstone belts of the Singhbhum craton bear a continuous crustal evolution history from ~3.6 to 3.1 Ga. Within the Iron Ore Group greenstone belts 3.2 Ga ultramafic bodies are present as sill like intrusions. Ultramafic bodies are cumulates from boninitic magma and in places associated with upper gabbroic intrusions. Dunite of the...

The Archaean cratonic nuclei of the continents are important as they contain the most significant evidences for the evolution of Earth e.g. the greenstone sequences. In the Indian Shield, one of the important cratons is the Singhbhum craton, where nearly 95% of the Indian chromite deposits and only PGE deposits are located which are hosted within M...

Sill-like ultramafic intrusions with massive chromitite bodies are common in Archean greenstone belts such as in the Zimbabwe craton and in the Singhbhum and Dharwar cratons of the Indian shield. In the western Dharwar craton deformed massive chromitites are hosted within dissected peridotitic rocks of the Nuggihulli schist belt and part of early t...

Os isotope studies of Mesoarchean (3.2 Ga) chromitite and associated gabbro–breccia hosted platinum-group element (PGE) deposits of the Singhbhum Craton in eastern India provide evidence for a complex history involving source mantle heterogeneity and hydrothermal processes. The average initial 187Os/188Os compositions of unaltered chromites of mass...

Supplementary Data Files of the UG2 chromitite paper published in JP 2007

The chromitite deposits of the Nuasahi and Sukinda massifs are part of layered ultramafic bodies which occur within Archaean low-grade metamorphic rocks of the Iron Ore Group (IOG) in the Singhbhum Craton of the Indian Shield. The chromitite seams are interlayered with dunite, and associated with orthopyroxenite. Detailed electron microprobe study...

Massive chromitite bodies and associated breccia hosted PGE deposits occur within Archaean greenstone belts in the Singhbhum craton in eastern India. The chromitite seams are interlayered with serpentinized dunite, and spatially associated with orthopyroxenite. The ultramafic suite is characterized by very high Mg# (0.66-0.82) and Cr# (0.75-0.87) f...

Chromitite layers are common in large mafic layered intrusions. A widely accepted hypothesis holds that the chromitites formed as a consequence of injection and mixing of a chemically relatively primitive magma into a chamber occupied by more evolved magma. This forces supersaturation of the mixture in chromite, which upon crystallization accumulat...