Geological features and origin of the Huize carbonate-hosted Zn–Pb–(Ag) District, Yunnan, South China
Geological features and origin of the Huize carbonate-hosted Zn–Pb–(Ag) District, Yunnan, South China
复制标题
DOI：
10.1016/j.oregeorev.2006.03.003
复制
发表时间：
2007-04
影响因子：
3.3
通讯作者：
Run-sheng Han;Run-sheng Han;Cong-Qiang Liu;Zhilong Huang;Jin Chen;Deyun Ma;Liao Lei;Geng-Sheng Ma-Gen
中科院分区：
文献类型：
--
作者：
Run-sheng Han;Run-sheng Han;Cong-Qiang Liu;Zhilong Huang;Jin Chen;Deyun Ma;Liao Lei;Geng-Sheng Ma-Gen
会泽锌铅银矿区位于川滇黔锌铅银成矿区内，是一个重要的高品位锌铅银矿床。锌和铅的总金属储量超过500万吨。本区具有以下地质特征：（1）矿石品位高（Zn+Pb≥25 wt.%）; (2)富含银和一系列其他微量元素（3）矿石分布受构造和岩性双重控制，（4）围岩蚀变简单而有限，（5）矿体内部矿物分带性，（6）矿石中的微量元素（Ge、In、Ga、Cd、Tl）含量较高，而方铅矿、闪锌矿和黄铁矿是Ag、Ge、Cd、Tl的主要载体。早石炭世白佐组容矿围岩及下伏基底中存在蒸发岩层。流体包裹体和同位素地球化学数据表明，成矿流体的均一温度为165-220 °C，盐度为6.6-12 wt.% NaCl当量，成矿流体和金属主要来源于昆阳群基底岩石和盖层的含镁橄榄石岩石。矿石是沿沿着有利的、特定的控矿构造沉积的。新的实验室和野外研究表明，会泽锌铅（银）地区不是一个碳酸盐交代型含块状硫化物存款矿床，而是一个变形的，碳酸盐容矿的MVT型矿床。矿床的详细研究为会泽铅锌（银）区隐伏矿体的定位、滇东北其他地区碳酸盐岩型硫化物矿床的找矿潜力以及川滇黔铅锌（银）成矿区提供了新的线索。
The Huize Zn–Pb–(Ag) district, in the Sichuan–Yunnan–Guizhou Zn–Pb–(Ag) metallogenic region, contains significant high-grade, 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 °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 ore-controlling structures. The new laboratory and field studies indicate that the Huize Zn–Pb–(Ag) district is not a carbonate-replacement deposit containing massive sulphides, but rather the deposits can be designated as deformed, carbonate-hosted, MVT-type deposits. Detailed study of the deposits has provided new clues to the localisation of concealed orebodies in the Huize Zn–Pb–(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.