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- W1966751019 abstract "Abstract We report a detailed mineralogical and geochemical study of hydrothermally altered basaltic rocks from the Othris ophiolite, central Greece. The Othris ophiolite was formed during the Early Mesozoic at an oceanic spreading centre. The extrusive rocks studied were erupted in a typical MOR-type environment, as indicated by their immobile-element composition. The Othris ophiolite is also characterized by a hydrothermal seafloor alteration mineralogy and geochemistry similar to that found in other ophiolite bodies (e.g., Troodos, Cyprus). The study of rock samples from three boreholes drilled in the Limogardi area of the Othris mountains indicates the presence of an alteration pipe in which successive zones with distinctive alteration assemblages have developed around a highly altered and mineralized core. The layer silicate minerals that formed during this alteration event also display distinctive chemical changes across the pipe. Furthermore, the bulk chemistry of the altered rocks varies systematically with the distance from the centre of the pipe. We propose that this pipe represents an upflow zone within the oceanic crust, through which hot, metal-bearing hydrothermal solutions rose towards the seafloor to form massive sulphide deposits. The Othris alteration closely resembles that observed beneath several well-known sulphide deposits, notably that of Mathiati, Cyprus, emphasising the uniform style of alteration present in seafloor hydrothermal systems. A model is presented to explain the controls on the mineralogy of upflow pipes, based on fluid chemistry and upflow path length." @default.
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- W1966751019 date "1994-06-01" @default.
- W1966751019 modified "2023-09-24" @default.
- W1966751019 title "The mineralogy and geochemistry of a hydrothermal alteration pipe in the Othris ophiolite, Greece" @default.
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- W1966751019 doi "https://doi.org/10.1016/0009-2541(94)90055-8" @default.
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