The origin of lead and sulfur in Tulare ore field, Lece magmatic complex

Lece magmatic complex in SW Serbia is one of the most promising zones for lead, zinc and precious metals in the Serbo-Macedonian metallogenic province. This complex was formed by post-collisional magmatic activity that lasted from Oligocene to late Paleogene. In this study, lead and sulphur isotope measurements were performed on different ore minerals in order to constrain the origin of mineralizing metals and the temperatures of their deposition.  The galenas from the Bakrenjaca ore field show high 207Pb/204Pb values implying that the lead was dominantly derived from the upper continental crustal geochemical reservoir which was probably recycled within the mantle and erupted during tertiary post-collisional magmatism. Sulphur isotopes were measured on galena, sphalerite and pyrite from this ore field and all d34S values are between 0 and 3 ‰, which indicate that sulphur has a mantle origin.  Sulphur isotopes were also used to estimate temperature of mineral deposition in veins and the calculated temperature was between 300 and 400°C. Since this temperature is too high for epithermal deposits, it is probable that these minerals weren’t deposited in isotopic equilibrium and other methods should be conducted for more precise temperature measurement.