Carbonic Fluid Overprints in Volcanogenic Massive Sulfide Deposits: Examples From the Kelan Volcanosedimentary Basin, Altaides, China

Geology, fluid inclusion geochemistry, and 40Ar/39Ar geochronology of the Wulasigou Cu deposit, and their implications for ore genesis, Altay, Xinjiang, China

“…12). We believe this result is acceptable considering that it is consistent with previous estimations for the neighboring Tiemurt Pb-Zn-Cu deposit using carbonic fluid inclusions (Xu et al, 2011;Zhang et al, 2012). The fluctuation of the estimated pressure (Fig.…”

“…However, recent studies revealed that some of the deposits in the Abagong polymetallic belt (e.g. Tiemurt; Xu et al, 2008bXu et al, , 2011Zhang et al, 2012) contain common CO 2 -rich fluid inclusions, which is inconsistent with the nature of seafloor hydrothermal systems forming syngenetic massive sulfide deposits Pirajno, 2009;Zaw et al, 1996), but accords with the epigenetic orogenic-type systems. This implies that at least some of the deposits in the Abagong polymetallic belt are orogenictype systems.…”

Ore geology and fluid inclusion geochemistry of the Tiemurt Pb–Zn–Cu deposit, Altay, Xinjiang, China: A case study of orogenic-type Pb–Zn systems

“…9). This result overlaps a previous trapping pressure estimation of 180-300 MPa using carbonic fluid inclusions (Xu et al, 2011). The fluctuation range of the estimated pressures (Fig.…”

“…2) and is hosted in the Devonian volcanic-sedimentary strata (He et al, 1995;Wang et al, 1998;Xiao et al, 2003, 2009Xu et al, 2008Xu et al, , 2011Wan et al, 2010). In the area of interest, the Kelan basin is deformed into an overturned syncline that strikes 50 km with axial plane dipping to northwest.…”

“…2005; Xu et al, 2008Xu et al, , 2011Wan et al, 2010). Modern seafloor hydrothermal systems (Luders et al, 2001) and ancient fluids forming VMS or Sedex deposits, such as the Kuroko in Japan (Pisutha-Arnond and Ohmoto, 1983), Ural in Russia (Bailly et al, 1999) and Hellyer in Australia (Zaw et al, 1996), are characterized by low salinity, CO 2 -poor, typically hydrostatic, and generally low-temperature ranging from 140 to 280°C.…”