عنوان مقاله [English]
Qarah Gol study area is located in Ahar- Arasbaran metallogenic zone in Ardabil province, 50 km from Meshginshahr city in Moradloo section. According to field studies, the main exposed rock units in the region include volcanic, plutonic and pyroclastic igneous rocks, microdiorite masses have injected into volcanic and igneous rocks and caused alteration and mineralization on a weak scale. Mineralized silica veins are often formed in parallel band and are sometimes seen as stockwork veins. According to geochemical results, the average concentration of copper is 138.21 ppm. Petrological observations and geochemical data show that the graniteoids of Qarah Gol area are calc alkalines type I related to subduction zone which is linked to porphyry copper mineralization. To identify the tectonic environment of the study area, diagrams of La/Yb versus Th/Yb and ZR3-Nb50-Ce/P2O5 can be used. These results show that the study area is located in post-continental collision. Also, the use of La / Yb versus Sm / Yb diagram shows that the samples were made from partial melting of 10 to 20% garnet peridotite. Based on Ce against Ce / Yb diagram, the melting depth of 100 to 110 km is estimated. Productive magma has a higher LREE / HREE ratio than barren magma, which is evident in samples of the Qarah Gol area. The values of Eu / Eu* igneous rocks in the range of Qarah Gol are between 0.7 to 1.07 and in this respect it is similar to the magmas that produce in the Urmia-Dokhtar belt.