| Abstract: | The Panxi Rift Zone is a famous metallogenic province in Southwest China. Continental rifting developed in Hercynian period (P 2, 260～250Ma) accompany with a series of basic|ultrabasic rocks. Various in lithologies, such as layered intrusions (V|Ti|Fe formation), small|sized mafic|ultramafic bodies (stocks) and large|scale basalt (Emeishan Basalt) are constituted of a complete melanocratic rock system.Most of Cu|Ni|PGE sulfide deposits are related to small|sized ultramafic rock bodies. It is a perfect possibility for them to be an affinity of basic eruptive lava and for the neck facies. But in ① Panzhihua|Center Yunnan Province, the Gaojiacun, also Jinbaoshan, as large stratiform basic|ultrabasic complex used to be thought that is older one intruded to basement rocks in Precambrian. However, new evidences suggest it is similar with the small|sized ultramafic rock bodies containing Cu|Ni|PGE, and also the both are affinity of the Emeishan Basalt; ② Miyi district, Cu|Pt mineralization was discovered in the Xinjie bedded basic complex, and in where ophitic olivine|pyroxenite|peridotite facies are exactly Pt|bearing layers; ③ Longzhoushan district, we have recently researched basic|ultrabasic clusters which intruded into fracture zones, and Cu|Ni|Pt, Pd mineralization developed at the salbands.Generally, the basalt is poor in PGE and rich in Cu. It is suggested as the result of PGE dispersion|concentration processing in the melanocratic rock system when rifting happened. |
