Abstract

Goorgoor iron occurrence is located in the northern part of the Sanandaj-Sirjan zone, 25 km west of Dandy. Mineralization at Goorgoor is hosted by deformed metamorphic rocks of schist and quartzite (equivalent to the Kahar formation) that is unconformably overlain by marble and dolomitic units. Schist rocks are consisting of garnet-mica schist, biotite schist, muscovite schist, and quartz-chlorite-epidote schist. Based on petrography, schist rocks show lepidogranoblastic, porphyroblastic and porphyropoiciloblastic textures; quartzite represent granoblastic texture. Three deformation events are recognized in the area, D1, D2, and D3; the main was D2. Iron mineralization occurs as lens-shaped bodies parallel to the foliation of host rocks. Based on mineralography, magnetite is the main ore which is accompanied with minor pyrite. Hematite and goethite are supergene minerals. Quartz and tourmaline are present in the gangue minerals. The ore minerals show disseminated, laminated and massive textures. Alteration is restricted to hematite, sericite and quartz-tourmaline alteration parts of the ore zones. Iron mineralization at Goorgoor was introduced in two stages: 1) The first stage is coeval with the deposition of the volcano-sedimentary units in the area. This stage occurs as stratiform and startabound lens and disseminated magnetite. 2) Stage 2 occurs as magnetite and quartz bands. This stage was formed during metamorphic and deformation events. Field and microscopic studies indicate that iron mineralization in the Goorgoor occurrence seems to be volcano-sedimentary type. Iron mineralization in Goorgoor occurrence could be used as a model for prospecting and reconnaissance of iron mineralization in the Sanandaj-Sirjan zone and similar districts of Iran that have similar geological features.