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

Majumdar, Dilip; Gogoi, Abhijit

doi:10.1007/s12594-019-1303-9

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“…The studied gabbro-anorthosite-hosted vanadium-bearing titanomagnetites with PGE have been discussed previously (Majumdar & Gogoi, 2019). Existing records on the regional distribution of similar occurrences are reported from the ultramafic-mafic-carbonatitealkaline complex in Samchampi-Samteran of Karbi Anglong, Assam.…”

Section: Discussionmentioning

confidence: 99%

“…In the past two decades, however, studies have indicated the presence of a wide array of metals, including copper in many parts of this Precambrian shield (Majumdar, 2010). Here, we present a report of the petrological-geochemical analyses on the Kulamati mafic-ultramafic complex, which is a layered gabbro-anorthosite body enriched in Fe-Ti, V, and platinum group of elements minerals (Majumdar & Gogoi, 2019). The Kulamati magmatic complex is located along the Kalapahar ridge in the vicinity of Koilamati (26 21 0 39.3 00 N; 93 46 0 39.6 00 E), close to the northern periphery of the Dhoniram Ingti Village (26 22 0 0.3 00 N; 93 45 0 57.5 00 E) in eastern Karbi Hills (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

“…There are several reports of Fe-Ti and V occurrences in nearby localities, for example, syenite-hosted vanadium-bearing titaniferous magnetite in Ganjang (Saha, Ganguly, Ray, & Chatterjee, 2010;Saha, Ganguly, Ray, & Dhang, 2010) in Karbi Anglong, PGE-bearing leuco-hornblende-gabbroic complex of East Khasi Hills in the Shillong Plateau (Hazra, Ray, Manikyamba, Saha, & Sawant, 2015), and the Fe, P, Nb, rare earth element (REE)-rich Samchampi-Samteran alkaline igneous complex in Karbi Anglong (D. Kumar, Mamallan, Saravanan, Jain, & Krishnamurthy, 1989;Nag, Sengupta, Gaur, & Absar, 1999;Saha, Ganguly, Ray, & Chatterjee, 2010;Saha, Ganguly, Ray, & Dhang, 2010). 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).…”

Section: Introductionmentioning

confidence: 99%

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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: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%