Abstract
This work presents the occurrence of sulphide mineralization for the first time in the Middle Porcellanite Member belonging to the Porcellanite Formation of the Semri Group in and around Amrora-Barwari-Kupa areas, Garhwa district, Jharkhand. The Porcellanite Formation has been categorised into four mappable units i.e. lower Porcellanite Member; middle Porcellanite Member; Amrora Member, and upper Porcellanite Member. Out of the four members, sulphide mineralization has been mostly observed in the middle Porcellanite Member which is represented by grey to black, fine-grained, thinly laminated porcellanite and made up of quartz and few grains of feldspar. Petrographic study shows that it comprises of devitrified glass, quartz shards, K-feldspar, plagioclase, and perthite phenocrysts as essential minerals and accessories are sericite, calcite, chlorite, opaque, and devitrified groundmass. It consists of sulphide minerals like chalcopyrite, pyrite, pyrrhotite, and grains of arsenopyrite and gold. Based on the field observations and ore petrographic study, three zones of sulphide mineralization have been marked within this unit. The longest sulphide mineralization zone exposed to the northeast of Amroa village is 750m long and 300m wide having an E-W trend. In this mineralization zone, specks of pyrite, chalcopyrite, and gold are observed which occur as dissemination. The second and third mineralization zones are 360m long and 150m wide having N-S trend and 300m long and 100m wide having NW-SE trend respectively which have mainly been noticed to the southeast of Barwari and northeast of Kupa village. The sulphide mineralization is mainly associated with shearing and faulting which has been corroborated by the petrography and field evidences.
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The authors are sincerely obliged to the Director General, Geological Survey of India for according necessary permission to publish this manuscript. We are also extremely grateful to Dr. Rajesh Asthana, Deputy Director General, Geological Survey of India, SU: Bihar for his constant cooperation, encouragement, guidance, and valuable suggestions during the finalization of the manuscript. We also thank the anonymous reviewers for their comments and suggestions which helped to improve the presentation.
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Yadav, P.K., Patel, D.K. & Dutta, S.K. Incidence of Sulphide Mineralization in Porcellanite of the Chopan Formation from the Vindhyan Supergroup, Eastern India. J Geol Soc India 98, 641–646 (2022). https://doi.org/10.1007/s12594-022-2039-5
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DOI: https://doi.org/10.1007/s12594-022-2039-5