1. The early Proterozoic Zn-Cu-Pb sulphide deposit of Rauhala in Ylivieska, western Finland.
- Author
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Kojonen K. (ed.), IGCP project 257., Iisalo E., Johanson B., Jokinen T., Rasilainen K., Ruotsalainen A., Soininen H., Tornroos R., Vaasjoki M., Vasti K., Kojonen K. (ed.), IGCP project 257., Iisalo E., Johanson B., Jokinen T., Rasilainen K., Ruotsalainen A., Soininen H., Tornroos R., Vaasjoki M., and Vasti K.
- Abstract
The ore deposit forms a slightly bent sheet conformably embedded within metasediments dipping about 30 degrees to northeast. The ore sheet, which is about 590 m long, 350 m wide and 2.1 m thick, consists of massive and disseminated ores. The major ore minerals are pyrrhotite, sphalerite, chalcopyrite, galena and pyrite. The textures of the ore minerals indicate recrystallisation and reequilibration during metamorphism. The galena lead of the deposit is homogenous, irrespective of style of mineralisation or the immediate host rocks, and belongs to the group of central Finland batholith type leads. The deposit is zoned geochemically resembling other volcanic- or sediment-hosted massive sulphide deposits with vertical zonation and a lateral sequence., The ore deposit forms a slightly bent sheet conformably embedded within metasediments dipping about 30 degrees to northeast. The ore sheet, which is about 590 m long, 350 m wide and 2.1 m thick, consists of massive and disseminated ores. The major ore minerals are pyrrhotite, sphalerite, chalcopyrite, galena and pyrite. The textures of the ore minerals indicate recrystallisation and reequilibration during metamorphism. The galena lead of the deposit is homogenous, irrespective of style of mineralisation or the immediate host rocks, and belongs to the group of central Finland batholith type leads. The deposit is zoned geochemically resembling other volcanic- or sediment-hosted massive sulphide deposits with vertical zonation and a lateral sequence.