1- Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran
Abstract: (313 Views)
The Sargaz volcanogenic massive sulfide deposit is located in southeastern Iran, northwest of Jiroft County. The lithology of the area includes pillow basalts, andesites, pyroclastics, and flysch. The formation of block smokers in basaltic units with pillow formation has caused the mineralization of copper and zinc massive sulfides in the Sargaz deposit. The copper and zinc mineralization event in the Sargaz deposit is in the southeastern part of the Sanandaj-Sirjan structural zone, which has been formed in the form of massive and stringers. Pyrite is the main sulfide mineral in this deposit, with chalcopyrite, sphalerite, tennantite, and pyrrhotite minerals seen with it. Siliceous and chlorite alteration in the mineralization zones is one of the most important alterations observed in the host rock of mineralization. These alterations are temporally and spatially dependent on the mineralization zone. Using the average homogenization temperature of the fluid inclusions obtained from 89 fluid inclusion samples, the separation of the sulfur isotope of the fluid from the sulfur isotope in equilibrium with sulfide minerals was performed. The studies showed that the origin of the sulfur in the mineralizing hydrothermal fluid consists of metamorphic rocks, as well as magmatic sulfur. The study of trace and rare earth elements in the mineralizing zone indicates a negative anomaly in HFSE elements and a positive anomaly in LILE lithophile elements. The positive anomaly in lithophile elements can indicate the mixing of the ore-forming fluid with silicate rocks.
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