Titaniferous Magnetite Deposits Associated with Archean Greenstone Belt in the East Indian Sheild

Mondal, Riya; Baidya, Tapan Kr.

doi:10.11648/j.earth.s.2015040401.12

Cited by 2 publications

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“…However, the presently studied Kulamati gabbro-anorthosite-hosted vanadiumbearing titano-magnetite body is a recent discovery in the region and is an unmetamorphosed body that intruded into the Shillong Group (Majumdar & Gogoi, 2019). There are examples of gabbro-hosted Fe-Ti and V-bearing layered complexes in the Archean and younger intrusions located in the Boula Nausahi Complex in Odisha, Betjharan in Mayurbhanj district, Dublabera area of the West Singhbhum district, Jharkhand, in parts of the Purulia district of West Bengal (Mondal & Baidya, 2015), as well as in the Simdega area in Eastern India F I G U R E 1 Regional geological map of Karbi Anglong, Assam (NE India), showing the location of Kulamati complex (D. Kumar, Pandit, & Chalapathi Rao, 2021). In general, Fe-Ti and V deposits occur in two distinct forms viz., stratiform and nonstratiform massif-type intrusives.…”

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confidence: 99%

An investigation of Fe‐Ti, V in the north‐east Karbi Hills, Shillong Plateau, north‐east India: Implication for mineralization

2021

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The Kulamati gabbro-anorthosite complex in the Karbi Hills of the Shillong Plateau, north-east India is a newly discovered stratified Fe-Ti-V-bearing magmatic body that has been classified as a titano-magnetite ore. The host gabbro-anorthosite is found intruded into the Mesoproterozoic Shillong Group. The stratified Fe-Ti-V oxide body consists mostly of magnetite-rich and magnetite-poor layers. The magnetite-rich bands are composed of titanomagnetite, haematite, ilmenite, and coulsonite with minor Alspinel, while the mineral constituents of silicate bands contain plagioclase, clinopyroxene, olivine, apatite, and chlorite. Titaniferous magnetites display a wide variety of subsolvus features, including Al-spinel-magnetite-ulvöspinel exsolutions and crystallographically oriented ilmenite exsolutions, but magnetites are exclusively vanadiferous. Comprehensive chemical analyses show that the ore is rich in TiO 2 (10.98-12.78 wt%) and V 2 O 5 (1.32-1.47 wt%). Ti is attributed by the presence of rutile, titanite, and ilmenite, while V is attributed by coulsonite as a solid solution component in the titanomagnetite. It records moderate to high Al 2 O 3 (4.51-5.46 wt%), with enrichment of FeO and Fe 2 O 3 (26.22-28.32 wt% and 39.34-42.86 wt%, respectively), which can be attributed to the presence of magnetite-spinel-ulvospinel. Higher Fe 2 O 3 and lower FeO are indicative of oxidizing conditions of the ore-forming environment. The rare earth element (REE) patterns have (La/Yb) N and (Ce/Yb) N ratios comparable to an evolved basaltic melt, with light REE being enriched compared to heavy REE and a positive Eu anomaly. The electron probe micro analyser data of magnetite is conformable with the bulk chemistry, and shows consistently high FeO (70.87-88.06 wt%), Cr 2 O 3 (1.02-2.44 wt%), TiO 2 (0.16-6.20 wt%), and V 2 O 3 (1.47-2.26 wt %), with trace amounts of Al, Si, Mg, Mn, and PGE. As per targeted parameters, the ore occurrence distinctly belongs to a stratified Fe-Ti-V class, where alternate thick (>1.0 m) and thin (<20 cm) strata resulted from the late magmatic crystallization of the original tholeiitic composition.

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Section: Introductionmentioning

confidence: 99%

An investigation of Fe‐Ti, V in the north‐east Karbi Hills, Shillong Plateau, north‐east India: Implication for mineralization

2021

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First Report on Platinum Occurrence in Ultramafic-Mafic Complex, East-Central Karbi Hills of Assam, North East India

Majumdar

Gogoi

2019

Journal of the Geological Society of India

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The results of SEM-EDS and XRD, indicating the presence of PGE in stratified vanadium bearing magnetite-ilmenite ore, hosted by layered ultramafic-mafic complex in a part of east-central Karbi Anglong district, Assam (NE India) are reported here. The initial XRD data indicate presence of PGE minerals like braggite, laurite and cooperite; the SEM-EDS indicate variable wt. % of PGE and rare metals like 11.58% Re and gold. The highest weight % value is 19.55 Pt; 13.83 Ir; 7.36 Os; 0.95 Pd and 0.45 Ru. Plume model has been cited as the key factor causing high partial melting of the upper mantle in back arc rift environment, producing platinum rich but sulphur poor magma, subsequently acquiring sulphur from pelites of Shillong Group, thereby, gaining PGE.

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Titaniferous Magnetite Deposits Associated with Archean Greenstone Belt in the East Indian Sheild

Cited by 2 publications

References 27 publications

An investigation of Fe‐Ti, V in the north‐east Karbi Hills, Shillong Plateau, north‐east India: Implication for mineralization

An investigation of Fe‐Ti, V in the north‐east Karbi Hills, Shillong Plateau, north‐east India: Implication for mineralization

First Report on Platinum Occurrence in Ultramafic-Mafic Complex, East-Central Karbi Hills of Assam, North East India

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