Metallogenic system of polymetallic Fe-Cu-Au-Pb-Zn deposits in Jinchanghe ore concentration district,Baoshan block,Southwest China

The Baoshan block in western Yunnan is an important part of the Sanjiang Tethys tectonic belt in southwest China. Its tectonic position is located at the middle section of the Sibumasu plate, which has been one of the hotspots in geoscientific research and has been a geological prospecting target in recent years. Controlled by the regional tectonic evolution, the Baoshan block has experienced the evolution processes of the Proto-, Paleo-, Meso- and Neo-Tethys, and the multi-stages of diagenetic and metallogenic events have occurred. The Jinchanghe polymetallic iron-copper-gold-lead-zinc ore concentration district includes Jinchanghe iron-copper-lead-zinc deposit, Hetaoping lead-zinc deposit, Douya polymetallic iron-Copper deposit, Heiniuao gold deposit, and Huangjiadi gold deposit.The deposits in the region have obvious metallogenetic zonings in space, and even ore bodies of a single deposit are also regularly distributed in zonings in the vertical and horizontal directions. In addition to deposit types, the useful mineral assemblages and element associations appear in zones in space, and the metallogenic elements change from high temperature to low temperature. Usually, it is showed that the pattern of Fe→Cu-Fe→Cu-Pb-Zn→Au mineral zonings from bottom to top or from inside to outside and the pattern of the skarn type→tectonic altered rock type→quartz vein type mineral zonings from the center to the outside. The sulfur and lead isotopic compositions and their variation ranges of representative deposits are relatively consistent, and the ore-forming fluids have similar characteristics, showing that different types of mineralization may have formed in the closing process of the Meso-Tethys Ocean in the early Cretaceous. Based on the characteristics of typical deposits and the sequences of tectonic events in the study area, the metallogenic model for polymetallic iron-copper-gold-lead-zinc deposits in Jinchanghe ore concentration district is proposed to provide scientific basis for future geological prospecting in the area.