Abstract: (138 Views)
The Sefidabh and Heydar Abad antimony mines are located in the northwest of Zahedan in the Sistan suture zone. The rock units in the area are Cretaceous ophiolitic complex, Eocene flysch sequence, Oligocene conglomerate and Oligocene intermediate igneous rocks. The antimony mineralization occurs as quartz-stibnite veins in the Oligocene conglomerate along a faulted zone. The hypogene sulfide minerals are stibnite and minor pyrite. The supergene minerals are hematite, goethite, limonite, stibiconite and senarmontite. The main alteration types are silicic, argillic and carbonatic that occurred around the veins and are characterized with quartz, calcedony, clay and carbonate minerals. The common ore textures are open space filling and brecciaed. Coliform and comb structure and lamellar and acicular stibnite crystals are observed in microscopic and mesoscopic scales as well. The vein type hypogene sulfides are formed by hydrothermal fluids in fractures and faults. The result of micro-thermometry of fluid inclusion in quartz, show that the homogenization temperatures range from 420 to 130 Cº and salinities range from 4 to 5.68 wt. % NaCl eq. that are in range those of epithermal ore deposits. The mineral assemblage, alteration types and texture of ore show that antimony mineralization in Sefidabeh and Heydar Abad mines is of low-sulfidation epithermal type, which are controlled by strike-slip faults.
Keywords: : Mineralization controls, antimony mineralization, Sefidabeh and Heydar Abad mines, Sistan suture zone
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