Features of fluid inclusions and sources of ore-forming fluid in the Maoping Zn-Pb-(Ag) deposit, Yunnan, China

摘要

The Maoping Zn-Pb-(Ag) deposit is a important representative of the well-known medium-to large-sized carbonate-hosted Zn-Pb-(Ag) deposits in the northeast of Yunnan, occurring in the Sichuan-Yunnan-Guizhou Pb-Zn Ore-forming Zone. It lies in a structurally compounding position, which is produced by a north-east-trending fault-fold belt, a south-north-trending fault-fold belt, and a north-west-trending fault-fold belt that are controlled by the Xiaojiang fault zone and the concealed SN-trending Zhaotong-Qujing fault zone.rnThe most important ore-bearing strata include the Upper Devonian Zaige Formation and the Baizuo Formation and the Weining Formation of Carboniferous, which are mainly composed of grayish to white, pinkish, ream coarse-grained dolomite, and compact lumpy light yellow limestone and siliceous limestone. The typical ore-controlling structures are the NE-extending interstratified fault zones and Maomaoshan fold in Zhaotong-Zhenxiong depression-fold zone, which are characterized by multiple period activities and a close relationship with mineralization. The ore belts (ore-bodies) are on the northwest wing of Maomaoshan plunging overturned anticline, and the NE-extending interstratified faults controlled the spatial distribution of orebodies. The juvenile motion is dominated by the Upper Permian Emeishan basalt eruption, which outcrops in the outer surrounds of the district.