| چکیده انگلیسی مقاله |
The Saheb skarn iron deposit is located about 16 km northwest of the Saheb district, in Saqez city, Kurdistan Province. This area lies within the Sanandaj-Sirjan metamorphic-magmatic zone. The main rock units in the study area include dolomitic rocks of the Soltanieh Formation, Permian and Cretaceous limestones, shale and granitoid batholith. The Saheb batholith shows quartz monzodiorite, quartz monzonite and granite in composition. This batholith has intruded into Permian and Cretaceous sedimentary units during the Late Cretaceous-Early Palaeocene, causing contact metamorphism and skarnification. The contact metamorphism zone in the area includes endoskarn and exoskarn zones and garnet skarn, garnet pyroxene skarn, pyroxene skarn, epidote skarn, marble and mineralized skarn subzones. The Saheb iron mineralization has vein and lenzoid-shape with a length of 20 to 100 m and a thickness of 3 to 10 m which formed within marble and hornfelsic units (exoskarn) and to a lesser extent in the intrusive mass (endoskarn). The ore bodies occur as massive, brecciated, open space filling, banded, vein-veinlet, disseminated and relict. Magnetite is the main ore mineral, which is accompanied by pyrite, chalcopyrite, and secondary minerals such as hematite, goethite, azurite, chalcocite, covellite and malachite. Garnet, pyroxene, epidote, actinolite, tremolite, calcite and quartz are present as the gangue minerals. According to the field and microscopic studies, epidotization, chloritization, sericitization, propylitization, and argillic alterations are the most extensive alterations in the mineralized area, respectively. Based on remote sensing studies, it can be stated that carbonate, sericitic and propylitic and gossan alterations are well developed in the region and in some cases, the alteration zones in the study area overlap with together. Field studies, mineralogical and textural features show that the Saheb iron mineralization is classified as a calcium-type skarn deposit. |
