International Journal For Multidisciplinary Research

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Presence of Ecandrewsite and Zincian-ilmenite in Auriferous Quartz Veins of North Singhbhum Mobile Belt, Jharkhand

Author(s) MADHUSHREE MANDAL, MADHUMITA BANARJEE, CHINCHU S.V., SUPRIYO PAL
Country India
Abstract Ecandrewsite (ZnTiO3), which is the zinc analog of ilemnite, has been found as an accessory phase in the metamorphosed hydrothermally altered rocks associated with gold mineralization in Lawa area, Jharkhand. We report the first description of zincian ilmenite-ecandrewsite from the auriferous mineralized zones of the area. The Palaeo to Mesoproterozoic North Singhbhum Mobile belt (NSMB), comprises low to medium grade meta-sedimentary and meta-igneous rocks along with auriferous quartz veins. The close resemblance of the NSMB to other Proterozoic gold deposits, with all the requisites for the formation of gold deposits, makes it potential auriferous deposit. The volcano sedimentary units comprise the dominant rock units at NSMB. The rock has undergone polyphase deformation and subsequent metamorphism, leading to extensive shearing of all the rock units. The gold in the northern part of the NSMB is associated with sheared grey quartz veins, trending E-W mostly showing parallel to sub parallel trends, with the South Purulia shear zone. Compositionally two distinct populations belonging to the (Zn-poor and Zn-rich) Ilmenite-Ecandrewsite solid solution series have been found from the auriferous mineralized zones in the Lawa mines. Petrographically also the distinction between both the end members of the ilmenite series have been observed, where the ilmenite is pure ilmenite along with zincian ilemnite along with ecandrewsite. Most of the grains of ecandrewsite donot show any zoning. Thermodynamically, at higher metamorphic grades the solubility of ZnTiO3 in ilmenite is primarily governed by temperature and pressure conditions, with the Zn atomic percent (apfu) rarely surpassing 4. Nevertheless, occurrences of zincian ilmenite containing 8 mol% ZnTiO3, accompanied by nearly pure ZnAl2O4 components, have been documented in areas subjected to nearly granulite grade metamorphic conditions.
Keywords Ecandrewsite, Gold mineralization, Zincian-ilmenite, Auriferous quartz veins, Palaeo-Mesoproterozoic, North Singhbhum Mobile Belt
Field Sociology > Geology
Published In Volume 6, Issue 2, March-April 2024
Published On 2024-04-17
Cite This Presence of Ecandrewsite and Zincian-ilmenite in Auriferous Quartz Veins of North Singhbhum Mobile Belt, Jharkhand - MADHUSHREE MANDAL, MADHUMITA BANARJEE, CHINCHU S.V., SUPRIYO PAL - IJFMR Volume 6, Issue 2, March-April 2024. DOI 10.36948/ijfmr.2024.v06i02.15456
DOI https://doi.org/10.36948/ijfmr.2024.v06i02.15456
Short DOI https://doi.org/gtrfp9
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