Regional evolution of hydrothermal fluids in the Noranda District, Quebec; evidence from delta 18 O values from volcanogenic massive sulfide deposits

Hydrothermal Alteration and Mineralization in the Neves-Corvo Volcanic-Hosted Massive Sulfide Deposit, Portugal. II. Oxygen, Hydrogen, and Carbon Isotopes

“…A mixing scenario may be consistent with a 800 RELVAS ET AL. Data for active sea-floor vents (de Ronde, 1995), the Hokuroku district (Hattori and Sakai, 1979), Buchans (Kowalik et al, 1981), Aljustrel, Rio Tinto, Blue Hill, and Crandon (Munhá et al, 1986), Kidd Creek (Huston and Taylor, 1999), Horne (Hoy, 1993), Balcooma (Huston, 1999), and Ducktown (Addy and Ypma, 1977). 6.…”

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“…Dans le district minier de Noranda au Québec, les failles syn-volcaniques ont joué un rôle très important dans la circulation des fluides à l'origine des dépôts de sulfures massifs volcanogènes à Cu, Zn, Pb, Ag et Au [de Horne, Delbridge, Corbet, Ansil, Norbec et Mobrun] (Hoy, 1993). L'assemblage d'altération de ces VMS, est formée de quartz, albite, séricite, chlorite et carbonate (Barrett et MacLean, 1994 Schardt et al (2001).…”

Stable isotopic constraints on Kuroko-type paleohydrothermal systems in the Mesoproterozoic Serra do Itaberaba group, São Paulo State, Brazil

“…Relatively high d 18 O whole-rock values also have been observed in wall rocks associated with massive sulfide deposits of Aljustrel in the Carboniferous Iberia pyrite belt (Spain), the Silurian Blue Hill (Maine, USA), and Kidd Creek and Mobrun in the Archean Abitibi greenstone belt (Canada) (Barriga and Kerrich, 1984;Munhá et al, 1986;Beaty et al, 1988;Hoy, 1993). These values have been interpreted as evidence of high 18 O ore-forming fluids and/ or an early low-temperature, near-seafloor alteration stage.…”

“…Munhá et al, 1986); the Triassic Gacun deposit, Sichuan, China (d 18 OZC5.5 to C8.5‰; Zengquian et al, 2001); and the Cretaceous Raul mine, Peru (d 18 OZC9.1 to C12.6‰; Ripley and Ohmoto, 1979). Hoy (1993) Hoy (1993) suggests that hydrothermal discharge duration is correlated with the size of the sulfide ore bodies and apparently is a primary control on the isotope composition of the rocks and mineralizing fluids. Beaty et al (1988) suggest that high 18 O ore-forming fluids are characteristic of exceptionally large base metal deposits.…”

“…In several "super giant" massive sulfide deposits (Ohmoto, 1996)-such as the Archean Kidd Creek and Horne deposits in the Abitibi belt (Canada); the Carboniferous Rio Tinto, San Guillermo, Filon, La Zarza, and Ajustrel deposits in the Iberian pyrite belt (Europe); and the Proterozic Crandon deposit in Wisconsin (USA) (Munhá et al, 1986;Beaty et al, 1988;Hoy, 1993)-one or more of the following features are present: an early low-temperature seafloor alteration stage, high d 18 O values of wall rock, high 18 O ore-forming fluids, and a lack of oxygen isotope homogenization in wall rocks. These characteristics point to long-lived hydrothermal systems, which may generate large base metal sulfide deposits.…”