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• W2188450892 abstract "The Middle Valley deposit is one of the largest massive sulfide deposits so far discovered on the seafloor. It is hosted within a thick (-500 m) sequence of alternating turbidites and hemipelagic sediments that overlie an equally thick sediment-basaltic sill complex. Pyrite and pyrrhotite are the most common phases within the deposit, with lesser amounts of sphalerite, magnetite, and chalcopyrite. Carbonates, hydrated magnesium silicates, and iron oxyhydroxides are common interstitial phases, and are paragenetically later than the sulfides. Hydrothermal reworking has resulted in some zone refining, with sphalerite enriched near the top of the deposit and chalcopyrite more common at deeper levels within the sulfide mound. Porous areas appear to have become sites for minor element accumulation during this metal redistribution. The deposit appears to have undergone pervasive low-temperature oxidation due to the circulation of a seawater-dominated fluid that has resulted in the oxidation of pyrrhotite to pyrite + magnetite, and the precipitation of magnesium-rich silicates and carbonates in voids between earlier-formed sulfide minerals. Sulfur isotope values of primary pyrite and pyrrhotite are relatively high, with a maximum value of 9.8‰, although there is a wide spread in the data (δ34S = 1.3‰ to 9.8‰). These sulfides are isotopically heavier than those from massive sulfide deposits on sediment-free spreading centers, where the sulfur is mainly derived from footwall basalts. The high sulfur isotope values of the Middle Valley sulfides reflect mixing in the hydrothermal fluids of basalt-derived sulfide with reduced seawater sulfate trapped in the porous turbidites." @default.
• W2188450892 created "2016-06-24" @default.
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• W2188450892 date "1994-01-01" @default.
• W2188450892 modified "2023-09-26" @default.
• W2188450892 title "Mineralogy and sulfur isotopic composition of the Middle Valley massive sulfide deposit, Northern Juan de Fuca Ridge" @default.
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