Abstarct: The Qarah Chay Neogene caldera is located at 30 km SE Quchan in the Binalud Zone. The volcanic rocks of the caldera are mainly dacite in composition and composed of plagioclase and amphibole. The rocks present a variety of porphyry, microlitic porphyry, sieve, trachytic and glomeroporphyritic textures. These rocks are enriched in light rare earth elements and large ion lithophyll (LILE) and depleted in heavy rare earth elements (HREE) and high field strength elements (HFSE). Calc-alkaline nature, apparent negative anomalies of high field strength elements (such as Ti, Nb and P), Pb positive anomaly, high Sr, Sr / Y, Na2O / K2O values, and low K and MgO values indicating the adakitic character of Persilis (HSA). The rocks are composed of continental marginally active environments. Also, the Nb and Ti depletion and high concentration of Rb, Ba, K and Th indicate the crustal contamination of the magma-forming rocks of the rocks. According to the results of mineral chemistry analysis, plagioclases are oligoclase to andesine and amphiboles are magmatic to hornblende. Calculations on amphiboles in dacitic rocks show that amphiboles crystallize at temperatures of 814 to 970 ° C and a compressive range of 55 to 245 MPa. Considering the relationship between depth and pressure, it can be concluded that magmatic crystallization It lies 6 to 1 km deep and then explodes and accumulates as microfiber facies. Due to the high temperature of the rock cut, there is significant corrosion between them.