Abstract
The Lobash copper-molybdenum-porphyry mineralization of the Lobash deposit. Northern Karelia, Russia, is located in the apical portion of the 2.715 Ga Lobash granitic intrusion and at its exocontact in an Upper Archean greenstone rock sequence. Molybdenite mineralization is confined to a quartz vein at the massif margin, while disseminated-streaky mineralization is confined to a stockwork in host rock sequences. The gold-base metal mineralization of the Lobash-1 deposit lies to the north of the molybdenum deposit. Mineral associations of ores and their geochemical characteristics were studied by microprobe analysis and the ICP-MS method. At the Lobash deposit, molybdenite is associated with pyrite, chalcopyrite and zonal scheelite-molybdoscheelite. The ore mineralization of the Lobash-1 deposit is confined to schistosity zones and rhyodacite dyke contacts. It consists of pyrrhotite, sphalerite, chalcopyrite, galena, gold, electrum, hessite, bismuth, bismuthine and various bismutotellurides. The ore mineralization of the Lobash Ore Field formed at a temperature which decreased from 440 to 145 ℃.
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The study was conducted under Scientific Research Project GR AAAA-A18-118020290084-7.
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Kuleshevich, L.V. (2023). New Data on the Mineralogy of Copper-Molybdenum-Porphyry and Associated Gold-Base Metal Mineralization of the Lobash and Lobash-1 Deposits, Karelia. In: Marin, Y. (eds) XIII General Meeting of the Russian Mineralogical Society and the Fedorov Session. GMRMS 2021. Springer Proceedings in Earth and Environmental Sciences. Springer, Cham. https://doi.org/10.1007/978-3-031-23390-6_45
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