نوع مقاله : مقاله پژوهشی
نویسندگان
1 کارشناس ارشد رشته مهندسی اکتشاف معدن
2 عضو هیئت علمی مهندسی معدن دانشگاه ارومیه
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسنده [English]
Agh Ziarat area is situated in the southeastern of the Salmas city. The important lithologic outcrops in this area are intrusive bodies well known as Qushchi granite which are late Carboniferous in age. Geochemically, these intrusive bodies have alkaline affinity and most likely classified as A-type granites. Moreover, a syenite body has cut this granite. The intrusion of granite body, into the reginal metamorphic rocks, has led to the metasomatism, alteration and mineralization processes. The Cu-Au-Mo mineralization has occurred in the pyrite-silica zones which have stockwork structure. Pyrite and melnikovite are the main sulfide minerals in altered zone. Arsenopyrite, chalcopyrite, sphalerite and galena are found in minor amounts. Microprobe mineralogical study indicates that gold has concentrated in pyrite within strongly silicified rocks. Average value of Au have obtained as 670 ppb in 70 lithogeochemical samples collected from mineralized zones and their maximum amount reach to 1.8 ppm. Au has a positive correlation coefficient with Mo (0.53). As is correlated with Co, Ni, Pb and Mo by the values 0.72, 0.53, 0.58, 0.57, respectively. Based on the geochemical factor analysis method three major factors are involved in mineralization. First factor includes As, Co, Ni, the second factor is Zn and Cu, and the third factor is Au, Mo and Pb.
کلیدواژهها [English]
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