甘肃省河西地区花岗岩类岩石与钨矿成矿关系探讨OACHSSCD

The Hexi area of Gansu province is located in the southern section of the Beishan orogenic belt and is one of the important tungsten polymetallic mineralization belts in China.There is a close spatiotemporal and genetic relationship between tungsten mineralization in the area and Mesozoic granite rocks.On the basis of systematically summarizing previous research results,this article explores the geological and geochemical characteristics,genetic types,and tectonic environments of granite rocks related to tungsten mineralization in the Hexi area,and deeply analyzes their relationship with tungsten mineralization.Research has shown that the mineralized granite in this area is mainly composed of highly differentiated and strongly over aluminum S-type or highly differentiated Ⅰ-type granite,formed in the Mesozoic intracontinental extensional environment.The mineralization of tungsten has gone through a complete process from the formation of ore bearing fluids through high differentiation evolution in the late magmatic stage to the filling metasomatism mineralization in the hydrothermal stage.The morphology of the rock mass,the characteristics of surrounding rock alteration,and the laws of structural ore control jointly control the positioning of tungsten ore bodies.this article establishes a three in one tungsten mineralization model of"high differentiation granite-structure-alteration"in the area,and points out future exploration directions.