Metallogenic significance and geochemical characteristics of granite rock from Yangshan gold ore belt Wenxian in Gansu province

Gold ore belt belongs to para-Carlin type gold deposits from Yangshan Wenxian in Gansu province.Gold resources amount reaches to 318 tons.The better development of granite dikes in mining area is closely related to gold mineralization.it is one of the prospecting criteria.According to analysis results of systematic sampling,main trace element and rare earth elements of granite,and lithogeochemical characteristics,the paper holds that plagioclase granite porphyry is named granite which is more accurate,and classified mainly I-type granite and S-type granite.It reflects the products of active continental margin and the characteristics of formative granite in syn-collision and after collision.Ore-forming potential of ore belt granite is very large.So research work for polymetallic comprehensive utilization in mining area can be strengthened.