Sources of material for massive sulfide deposits in the Urals: Evidence from the high-precision MC-ICP-MS isotope analysis of Pb in galena

Lead isotopic systematics of massive sulphide deposits in the Urals: Applications for geodynamic setting and metal sources

“…The lower mafic boninitic-like sequence is host for the Oktiabrskoye deposit with the least radiogenic lead. The most radiogenic isotopic composition was recorded for the Baymak-type BaltaTau deposit, which occurs at the contact between the Baymak-Buribai Formation and the overlying Irendik Formation (Herrington et al 2002, Seravkin et al 1994 Pb/ 204 Pb ratio (based on our data and data from Chernyshev et al, 2008). All other deposits clusters are very tight isotopic groups,…”

“…Given that a large fractionation for lead isotope data from the Bakr-Tau deposit was found in the independent study by Chernyshev et al (2008), this may be geologically significant.…”

“…The most recent paper describing the lead isotopic composition of massive sulphide deposits in Urals was published by Chernyshev et al (2008) who studied galenas from 13 massive sulphide deposits situated in the Middle and Southern Urals. They concluded that the ancient continental crust of the eastern island-arc margin and marine sediments of the Devonian volcano-sedimentary sequences played a crucial role in the contamination of primary mantle melts with crustal material.…”

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

“…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).…”

“…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]. Our investigations of melt inclusions and fluid inclusions of magmatic water (FI) in quartz phe nocrysts from acid volcanic rocks of the Uzel'ginskoe ore field performed by the high precision local method of mass spectrometry with laser ablation (LA ICP MS) allowed us to establish high saturation of primary magmatic fluid and magmatic melt by met als.…”