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• W3174287676 endingPage "125795" @default.
• W3174287676 startingPage "125795" @default.
• W3174287676 abstract "Petrographic, SEM, and EPMA analyses are used to study the micro-textures and mineralogical composition of samples collected by a TV-grab from the 26°S SMAR (southern Mid-Atlantic Ridge) hydrothermal field. The investigated samples include the outermost chimney walls and sulfide debris. Isocubanite-chalcopyrite intergrowths are the major Cu-Fe sulfide phase in the chimney wall samples. These intergrowths include normal chalcopyrite, anomalous chalcopyrite (Cu-poor, Zn- and Fe-rich), normal isocubanite with Cu/Fe < 0.50, and Cu-rich isocubanite with Cu/Fe > 0.50. Anomalous chalcopyrite and Cu-rich isocubanite represent the intermediate phases between stoichiometric chalcopyrite and isocubanite in the Cu-Fe-S system. Anomalous chalcopyrite occurs as cores or thin rims bordering isocubanite, which associated with sphalerite. While Cu-rich isocubanite commonly associates pyrite. Based on textural relationships and microanalytical data of both phases, we interpret the abundant anomalous chalcopyrite and Cu-rich isocubanite as metastable or as high-temperature (~300 °C) rapidly precipitated hydrothermal sulfides. This interpretation advocates the SMAR 26°S hydrothermal field as an immature and short-living system. • Petrography of the SMAR 26°S chimney wall reveals information about vent evolution. • Hydrothermal activity of SMAR 26°S was short and chimney maturity is low. • Temperature of SMAR 26°S fluid at the time of mineral precipitation was ~300 °C. • Various sub-types of isocubanite and chalcopyrite are identified in the SMAR 26°S. • Isocubanite of various known seafloor massive sulfide deposits is compared." @default.
• W3174287676 created "2021-07-05" @default.
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• W3174287676 date "2021-11-01" @default.
• W3174287676 modified "2023-10-05" @default.
• W3174287676 title "Isocubanite-chalcopyrite intergrowths in the Mid-Atlantic Ridge 26°S hydrothermal vent sulfides" @default.
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• W3174287676 doi "https://doi.org/10.1016/j.chemer.2021.125795" @default.
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