Document Type : Original Research Paper
Authors
1 Ph.D., Department of Geology, Islamic Azad University, Science and Research Branch, Tehran, Iran.
2 Assistant Professor, Department of Geology, Faculty of Natural Science, Tabriz University, Tabriz, Iran
3 Professor, Department of Geology, Faculty of Earth Science, Shahid Beheshti University, Tehran, Iran
4 Associate Professor, Department of Geology, Faculty of Natural Science, Tabriz University, Tabriz, Iran.
Abstract
The Syah kamar molybdenum deposit is a porphyry molybdenum system which has been explored during the recent research of author in the northwest of Iran and is being reported for the first time and its ore mineralization is explained and discussed in this paper on the basis of geological data, mineralization evidences, geochemistry and fluid inclusions thermometry data. A porphyry quartz-monzonitic stock, which belongs to the K-rich (alkali-rich) calc-alkaline rock series and on the basis of geochemical data and tectonic setting viewpoint, formed as the post-collision granites is considered as the mineralization parent rock of this system. According to the emplacement pattern of productive intrusive bodies of the region, the mineralization of molybdenum have occurred after Eocene time, about the Oligocene time, and the mineralization process has taken place most probably at the last stage of magma emplacement, and on the basis of microthermometery and salinity data, its metaliferous hydrothermal solution have had low salinity and medium homogenization temperature. In addition, according to the host rock type, accompanying alterations and some other evidences, the mineralization characteristics of Syah kamar molybdenum prospect are comparable with the molybdenum deposits of the quartz-monzonitic type. During the tectonic processes, the ore-bearing hydrothermal solution ascended along weak zones and suitable fault structures, and intruded into the joints and fissures of surrounding rocks, and as a result of physiochemical changes of environment and some other effects, finally the Syah kamar molybdenum deposit has been formed.
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