Geological features and origin of the Huize carbonate-hosted Zn-Pb-(Ag) District, Yunnan, South China

被引:122
|
作者
Han, Run-Sheng [1 ]
Liu, Cong-Qiang
Huang, Zhi-Long
Chen, Jin
Ma, De-Yun
Lei, Li
Ma, Geng-Sheng
机构
[1] Kunming Univ Sci & Technol, Inst SW Geol Survey, Kunming 650093, Peoples R China
[2] Chinese Acad Sci, Inst Geochem, Open Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China
基金
中国国家自然科学基金;
关键词
MVT deposit; carbonate-hosted Zn-Pb-(Ag) sulphide deposit; Huize Zn-Pb-(Ag) district; Yunnan; China;
D O I
10.1016/j.oregeorev.2006.03.003
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The Huize Zn-Pb-(Ag) district, in the Sichuan-Yunnan-Guizhou Zn-Pb-(Ag) metallogenic region, contains significant highgrade, Zn-Pb-(Ag) deposits. The total metal reserve of Zn and Pb exceeds 5 Mt. The district has the following geological characteristics: (1) high ore grade (Zn+Pb >= 25 wt.%); (2) enrichment in Ag and a range of other trace elements (Ge, In, Ga, Cd, and Tl), with galena, sphalerite, and pyrite being the major carriers of Ag, Ge, Cd and Tl; (3) ore distribution controlled by both structural and lithological features; (4) simple and limited wall-rock alteration; (5) mineral zonation within the orebodies; and (6) the presence of evaporite layers in the ore-hosting wall rocks of the Early Carboniferous Baizuo Formation and the underlying basement. Fluid-inclusion and isotope geochemical data indicate that the ore fluid has homogenisation temperatures of 165-220 degrees C, and salinities of 6.6-12 wt.% NaCl equiv., and that the ore-forming fluids and metals were predominantly derived from the Kunyang Group basement rocks and the evaporite-bearing rocks of the cover strata. Ores were deposited along favourable, specific orecontrolling structures. The new laboratory and field studies indicate that the Huize Zn-Pb-(Ag) district is not a carbonatereplacement deposit containing massive sulphides, but rather the deposits can be designated as deformed, carbonate-hosted, MVTtype deposits. Detailed study of the deposits has provided new clues to the localisation of concealed orebodies in the Huize ZnPb-(Ag) district and of the potential for similar carbonate-hosted sulphide deposits elsewhere in NE Yunnan Province, as well as the Sichuan-Yunnan-Guizhou Zn-Pb-(Ag) metallogenic region. (c) 2006 Elsevier B.V All rights reserved.
引用
收藏
页码:360 / 383
页数:24
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