Articles
Publication Date: 2025
Journal of African Earth Sciences (1464343X)230
The structural system related to iron mineralization in the form of skarn and hydrothermal deposits in the Shizan region, northeastern Iran, has a direct relationship with the geometry of deformations, fractures, faults, and intrusive masses, with their penetrative nature serving as the source of fluid motion. This study aims to investigate tectonic structures, analyze them, identify stress trends and mineralization phases, and illustrate the region's structure. A tectonic model related to mineralization in the Shizan region, situated at the eastern end of the intracontinental Doruneh fault, will be presented. Tectonic events in the area are attributed to the activity of this fault, with a particular focus on the Illeh fault. This fault is an important branch that influences mineralization and morphology. By surveying the faults in the region and analyzing the density of each fault series and mineral trends, two main stress trends were identified: one trending NW-SE and the other NE-SW. The change in stress trends has led to the formation of three generations of faults and mineralization. The first mineralization phase, characterized by the N080-120 trend, occurred within the first stress trend along E-W to NW-SE faults. The subsequent mineralization phase with the N350-070 trend was associated with the second stress trend along N-S to NE-SW faults. Following the N015-060 trend, the final mineralization phase occurred when the second stress trend was reactivated along NE-SW faults. The structural evolution during the initial phase of the stress trend resulted in the formation of horsts, grabens, and half-grabens. The results indicate a clear correlation between the open spaces formed in the fault zones and mineralization, facilitating solution flow and promoting iron precipitation in the first and second phases. © 2025
Publication Date: 2022
Neues Jahrbuch fur Mineralogie, Abhandlungen (00777757)197(3)pp. 285-301
The Hureh Au-Cu veins are located north of Shahrekord, in the central part of the Sanandaj-Sirjan Zone (SaSZ). Mineralized country rocks consist of Mesozoic volcanic, sedimentary and low-grade metamorphic rocks. Main vein minerals are quartz, adularia, carbonates, pyrite, chalcopyrite, chalcocite, covellite, malachite, azurite, hematite, magnetite and goethite. Mineralization occurs as veins, vein swarms, stockwork, and as disseminated and breccia type with quartz, adularia, illite, calcite, hematite, chlorite and sericite as gangue minerals. The analyzed vein samples show up to 1343 ppm Au and > 10000 ppm Cu. The vein minerals reflect the near neutral-pH and reduced composition of the ore fluid. Micro-thermometric analyses show that the salinity of the ore-bearing fluid was between 6.74 and 10.74 wt% NaCl equiv. Fluid inclusion microthermometry indicates mineralization temperatures between 180° and 290 °C. Minimum pressure at the time of fluid entrapment is estimated at about 50 to 100 bars, equivalent to hydrostatic depths of 110 to 150 m. The main factors that gave rise to the Hureh mineralization are an island arc tectonic setting, presence of fractures and faults, and permeabil-ity of the country rocks. The Hureh mineralization can be classified as a low sulfidation epithermal system. © 2022 E. Schweizerbart’sche Verlagsbuchhandlung, Stuttgart, Germany.
