The Archaean gold mineralization in Rämepuro, llomantsi greenstone belt, Eastern Finland |
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| Authors: | VJ Ojala LJ Pekkarinent T Piirainen PA Tuukki |
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| Institution: | Department of Geology, University of Oulu, SF-90570 Oulu, Finland;Outokumpu Oy Exploration, SF-83500 Outokumpu, Finland |
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| Abstract: | The Rämepuro gold mineralization is situated in the Hattu sub-belt of the Archaean Ilomantsi greenstone belt, Eastern Finland. It consists of gold-bearing quartz veins located mainly within the shear zone contact between felsic volcanics and sedimentary rocks. The quartz veins cutting all the types of Archaean rocks are composed mainly of quartz and tourmaline and minor amounts of pyrite, pyrrothite, chalcopyrite, sphalerite, siderite, hedleyite, native bismuth and gold. The highest amounts of gold are found in the quartz-tourmaline veins, with abundant chalcopyrite and sphalerite. Gold has its best correlation with Bi, Te, S, Zn and Cu. The minor mineralogical alterations (sericirization, saussuritizarion, chloritization) are connected with variations in some major elements. The quartz veins were emplaced under greenschist facies conditions after the peak in the lower amphibolite facies metamorphism. |
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