【摘要】 云南省保山—镇康古生代沉积盆地的上寒武统碳酸盐岩中发育有脉状铅锌矿体,它们均受地层和构造的双重控制. 芦子园铅锌矿是该区此类型规模最大的一个矿床,矿体赋存于沙河厂组的大理岩及大理岩化灰岩中.其原生矿金属矿物组 合为:闪锌矿、方铅矿、黄铜矿、黄铁矿和磁铁矿.围岩蚀变有矽卡岩化、绿泥石化、硅化、黄铁矿化和大理岩化等.流体包裹 体研究表明,该地区铅锌矿化经历中低温(160～280℃)和中高温(280～420℃)2个主要矿化阶段.芦子园铅锌矿的硫、铅 同位素组成具有变化范围窄、相对均一的特点(δ(34S)=9.23×10-3～10.17×10-3;w(206Pb)/w(204Pb)=18.224～18.338, w(207Pb)/w(204Pb)=15.715～15.849,w(208Pb)/w(204Pb)=38.381～38.874),其矿石硫与铅同位素都反映了成矿过程曾 受到岩浆活动的影响.研究表明:镇康地区铅锌矿为与上寒武统局部层位和隐伏岩体有关的热液型铅锌多金属矿床.更多还原

【Abstract】 Carbonate-hosted lead-zinc sulfide veins in the Upper Cambrian are located in the southern area of the Baoshan-Zhenkang Paleozoic sedimentary basin, Yunnan Province. Geologic evidence suggests that controls on the deposit are both stratigraphic and structural. The Luziyuan Pb-Zn deposit, hosted by marble and marbleization-limestone of the Shahechang Group, is the largest in this area. Mineralization consists of galena, sphalerite, chalcopyrite, pyrite, and magnetite. Alteration consists of skarnization, chloritization, silicification, pyritization, and marbleization. Fluid inclusion studies indicate that the mineralization has two main stages: the lower-middle temperature stage （homogenization temperatures of 160 ℃ to 280 ℃） and the upper-middle temperature stage （homogenization temperatures of 280 ℃ to 420 ℃）. Sulfide has a very uniform S, Pb isotope composition, with δ(³⁴S)=（9.23-10.17）×10^-3, w(²⁰⁶Pb)/w(²⁰⁴Pb)=18.224-18.338, w(²⁰⁷Pb)/(w(²⁰⁴Pb))=15.715-15.849, and w(²⁰⁸Pb)/w(²⁰⁴Pb)=38.381-38.874. Both the S and Pb isotopes of ore indicate the partial role of magma hydrothermal fluid in mineralization. The carbonate-hosted Pb-Zn deposits in the Zhenkang area are considered to be strata-bound hydrothermal deposits that formed in favorable tectonic areas in the basis of ore source beds, are associated with magma activities, and have the features of multi-epochs and multi-stages as well as multi-sources in mineralization.更多还原