Influence of Tectonic Factor on Porphyry Copper Deposits Localization and Distribution (Arasbaran District,NW Iran): Synthesis of Alteration Patterns and Lineaments Using Digital Techniques

Geotectonics - The Kighal and Bormolk porphyry copper deposits (PCDs) are known subeconomic deposits and are ~10 km south of Sungun, the world-class copper mine in NW Iran. The deposits are located...     

Petrography,geochemistry, and U–Pb geochronology of pegmatites and aplites associated with the Alvand intrusive complex in the Hamedan region,Sanandaj–Sirjan zone,Zagros orogen (Iran)

International Journal of Earth Sciences - The Alvand intrusive complex in the Hamedan area in Iran is in the Sanandaj–Sirjan zone of the Zagros orogen. It consists of a wide range of plutonic...     

Spatial Analysis on Gold Mineralization in Southwest Saqqez Using Point Pattern,Fry and Fractal Analyses

Geotectonics - The Baneh- Saqqez zone is part of the Sanandaj‒Sirjan Zone, northwest of Iran. Generally, this zone is recognized as a gold bearing zone, and the mineralization in it is...     

Chemical zoning of Ca-amphiboles in amphibolites,from the Hamedan area,West Iran

Amphibolite layers of the Hamedan area (Sanandaj-Sirjan zone, west Iran) contain amphibole crystals with strong optical zoning. These amphibolites occur as interlayers in middle Jurassic, Buchan-type andalusite-garnet-staurolite and sillimanite-garnet-andalusite schist of the area that were intruded by late Jurassic magmatic bodies of the Alvand plutonic complex. Electron microprobe analyses results show that the zoned amphiboles have ferrohornblende cores that change to ferroedenite toward the rims. The core-to rim increase of Al, Fe, Na, and K and decrease of Si and Mg along with edenitic substitution in amphiboles is consistent with increase in metamorphic grade. Thermobarometry calculations based on amphibole composition and hornblende-plagioclase thermometry provided 492 to 508 ^o C and 4.3 to 4.9 kbar for the inner cores, 495 to 514 ^o C and 4.5 to 5.1 kbar for the outer cores, 538 to 564 ^o C and 5.3 to 5.8 kbar for the inner rims and 552 to 573 ^o C and 5.5 to 5.9 kbar for the outer rims, respectively. These results point to a nearly isobaric prograde P-T path for the Hamedan area amphibolites, compatible with a metamorphic evolution dominated by the thermal perturbation associated with the late Jurassic magmatism of the northern Sanandaj-Sirjan zone.