The role of magmatogene fluid in the formation of the Talgan copper-zinc-pyritic deposit, Southern Urals

U-Th-He Geochronology of Pyrite from the Uzelga VMS Deposit (South Urals)—New Perspectives for Direct Dating of the Ore-Forming Processes

“…The Uzelga deposit is an example of a long-lived, volcanic-related, seafloor/subseafloor ore-forming system [32,36,81,[87][88][89]. The formation of main sulfide masses was synchronous with the Late Eifelian basalt-rhyolitic magmatism and was coeval with the terrigenous-carbonate sedimentation, ca.…”

Direct data on the ore potential of acid magmas of the Uzel’ginskoe ore field (Southern Urals, Russia)

“…Most researchers agree to its origin from seawater transformed upon interaction with the host volcanic rocks. However, the isotope data (Sr, H, O, C) provide evidence for a mixed [4,5] or a predominantly deep [6,7] nature of matter in hydrothermal fluid. The major role of the mantle component (DMM A and EM I) is evident from lead of galena in sulfide ores of the Urals [8].…”

“…It is necessary to men tion that the peaks of 107 Ag and 197 Au associate with 23 Na, which provides evidence for their presence in the composition of fluid. Magmatic fluid contains high concentrations (ppm) of B (40-2000), Cu (300-3700), Zn (80-3400), Pb (14-1000), Ba (20-2200), Sn (4-1600), Au (4)(5)(6)(7)(8), and Ag (4-11).…”

“…Rudnitskii [1] demon strated that the contents of these metals were not suf ficient for the formation of large Cu and Zn deposits. Alternative ideas on the deep or magmatogene nature of metals [5,7,8] were essentially intuitive before our study. Many geologists in our country [14] and abroad (see, for example [15]) are returning to the magmato gene hypothesis of sulfide ore formation.…”

“…Ore forming fluids in the deposits of the region studied by FIs in hydrothermal quartz, sphalerite, bar ite, and calcite [4,5,7] had salinity in most cases 2-3 times as high as mineralization of seawater (up to 23 wt % eq. NaCl).…”