Abstract:Machangqing CuMoAu deposit is one of the deposits which have a close genetic relation with Himalayan alkaline intrusive in western Yunnan Province. The CuMoAu mineralization is spatially and temporally accompanied with the Machangqing intrusive. There are distinct zonations of alteration, mineralization and the element assemblages: porphyrytype CuMo mineralization inside the intrusive, contact metasomatictype CuMoAu mineralization along the contact between the intrusive and surrounding rock, epithermal AuAgPbZn mineralization in wallrock, and CuMo mineralization mainly in the alteration zone of quartzKfeldsparsericite of intrusive. The spatial and temporal relationship of metallogeny, the types of mineralization and alteration, and the distribution of element association display that oreforming fluid deriving from magma crystallization accumulated along the path while migrating outward. Isotopic geochemistry research shows that CuMoAu deposits may be the products of the same magmatictectonic metallogenic system under different physicalchemical conditions. Alkaline intrusive rock in Himalayan provided oreforming material and fluid, and the thermal dynamic condition for deposit formation, which is reflected by the alteration change from the interior of porphyry mass to contact zone and country rock. The types of mineralizatin, alteration of the country rock, as well as element assemblage indicate the evolution process from high temperature to low temperature suggesting an indispensable result of magmatic evolution.