Effect of low-temperature mineralization of mantle fluid processes: as examplified by the polymetallic deposits of cenozoic alkali-rich porphyry of western Yunnan, China

摘要

Sanjing region (the region of three rivers, i.e. Jinsha-Lanchang-Nujiang rivers) is a very active Cenozoic interplate deformation area on the east margin of Qinghai-Xizang Plateau, where the alkali-rich porphyry bodies occur extensively and the porphyry-related polymetallic mineral resources are produced. Many studies on the petrology and geochemistry of the alkali-rich porphyry have been carried out and the generally accepted conclusion is that the petrogenesis material source has something to do with the enriched source in the mantle. The integrated interactive factors of the mineralization related to the alkalirich porphyry consist in the favourable combination of the mantle fluid metasomatism, which is derived from the deep processes, and the conducting and controlling roles of the large-scale deep faults.