SULPHUR ISOTOPIC COMPOSITION OF SULPHIDE AND SULPHATE MINERALS FROM LUBIN MINE, SW POLAND

This work presents the results of sulphur isotopic analyses conducted on 130 samples of sulphides and 50 samples of sulphates, collected in different parts of the Lubin mine. Simple copper sulphides contain isotopically very light sulphur. For digenite average value of δ34S was found to be –35,9‰, and for chalcocite –32,0‰. Bornite also has low value of δ34S, on average –31,7‰. Slightly higher values were found for chalcopyrite and covellite: –29,6 and –27,9‰ on average. The heaviest sulphur is in tennantite–tetrahedrite series: –9,3‰. Sphalerite and galena also have isotopically light sulphur, –27,1 and –25,4‰, respectively. The lightest isotopic composition of sulphur was found in pyrite and marcasite (–37,9‰). There were found consistent differences in the isotopic composition of sulphides depending on their formation and localization in the deposit. Barite from the Lubin mine is shows higher values of δ34S: 12,3‰ on average, similarly to gypsum and anhydrite: 12,1‰. All those minerals have lighter composition when they occur in veins with sulphides comparing those in barren veins. Weathering sulphates – chalcantite and epsomite have the lowest values of δ34S, similar to the composition of copper sulphides.

Geochemical Features of Lead and Sulfur Isotope of Yinchanggou Pb-Zn Deposit in Ningnan County, Sichuan Province, China

inchanggou lead-zinc mining area, Ningnan county, Sichuan province is a medium reserves ore deposit in recent years. In order to study origin of the deposit,lead and sulfur isotopic geochemical features of the deposit must be research. In the deposit,mean value of 206Pb／204Pb of 9 samples is 0.285 (from 18.116 to 18.401), mean value of 207Pb／204Pb is 0.098 (from 15.658 to 15.756),and mean value of 208Pb／204Pb is 0.635 (from 38.249 to 38.884).which show lead of the ore deposit come main from upper earth's crust and few from orogenic zone. Average value is δ34S in the lead-zinc ore is 15.02 per thousand(from 5.8 per thousand to 20.32 per thousand), with positive value of sulphur isotopic composition. It is shown as heavy sulfur-rich, which is similar with composition characteristics of δ34S of seawater evaporate. The deposit is a strata-bound deposit with multi-material source.

Sulphur-isotopic composition of the deep-sea mussel Bathymodiolus marisindicus from currently active hydrothermal vents in the Indian Ocean

Sulphur-isotopic composition of soft tissues from Bathymodiolusmarisindicus collected from hydrothermal vents in the Indian Ocean was reported. The δ34S values of the soft tissues (+3∼+5‰ vs Cañyon Diablo troilite) were nearly identical to those from the associated hydrothermal fluid and chimney sulphides (+5 to +8‰), but were significantly different from that of the common seawater sulphate (+21‰), which suggested that the endosymbiotic bacteria used sulphide in the fluid as an energy source. Transmission electron microscopic observation of the endosymbionts also suggested that the symbiont is a thioautotroph. Bathymodiolus species, which depend on either sulphide or methane oxidation, or both, have a worldwide distribution. Bathymodiolus marisindicus from the Indian Ocean has a close relationship with congeners in the Pacific Ocean as evidenced by form of symbiosis. Biogeography and migration of the genus Bathymodiolus based on the relevant data are briefly discussed.