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- W646147675 abstract "Highly deformed and metamorphosed Zn-Cu deposits in the Vihanti-Pyhasalmi district of central Finland preserve the geochemical signature of pre-metamorphic seafloor alteration and are thus considered as volcanogenic massive sulphide (VMS) deposits. The distribution and chemistry of alteration associated with several deposits (Kangasjarvi, Ruostesuo) constrains an overall stratigraphic-hydrothermalframework. Massive sulphide deposits are hosted by chlorite-sericite altered rhyolites (biotite-garnet-orthoamphiboleassemblages) associated with ca. 1.93-1.91 Ga bimodal volcanic sequences. On the mine-scale, alteration of these rocks is contiguous with chloritic stockwork zones (orthoamphibole-cordierite assemblages; depleted δ18O values) developed in adjacent mafic volcanic rocks which define hydrothermal upflow zones within the stratigraphic footwall. Local epidotization and metal leaching of basal basalts and andesites suggests that these rocks were located within high-temperature (>400°C) hydrothermal reaction zones, likely in the immediate hanging wall of felsic subvolcanic intrusions. On a regional scale, low-temperature, semi-conformable alteration of felsic volcanic rocks (alkali exchange; enriched δ18O values) reflects broad areasof hydrothermal recharge and indicate the upper levels of stratigraphy. The above stratigraphic model canbe used to guide lithogeochemistry-based exploration strategies in the district and also provides a frameworkto gauge and test the significance of components within the stratigraphy (e.g., felsic intrusions, high-silicarhyolites) and their fundamental relationship with mineralization." @default.
- W646147675 created "2016-06-24" @default.
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- W646147675 date "2003-01-01" @default.
- W646147675 modified "2023-09-23" @default.
- W646147675 title "Reconstructing the architecture of highly deformed and metamorphosed Zn-Cu massive sulphide deposits in the Vihanti-Pyhäsalmi district, central Finland" @default.
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