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云南省马关县都龙超大型锡锌多金属矿床是我国重要锡锌资源基地之一,夕卡岩化是矿床中最主要近矿围岩蚀变,近年的地质勘探与找矿过程中,发现了前人所忽视的符山石,该类夕卡岩矿物主要分布于无水夕卡岩与含水夕卡岩过渡部位,属于含水夕卡岩阶段的产物,并与Zn-Cu矿化关系密切,可以作为相关矿化找矿标志。本文通过LA-ICP-MS对该类矿物进行了原位主、微量及稀土元素分析,结果表明,符山石中富集Zn、Sn、W和Bi等成矿元素,这些成矿元素以类质同象形式置换了符山石的晶格中的Mg2+和Fe2+,暗示在湿夕卡岩阶段成矿流体中已经大量富集了这类成矿元素,有利于后期相关矿化的形成。此外,该类矿物稀土配分模式为中等向右倾斜曲线,Y/Ho比值在22.3~34.4之间,与矿区深部燕山期隐伏花岗岩较为相似,表明其形成与该岩体关系密切。
The Du Long ultra-large tin-zinc polymetallic deposit in Maduan County, Yunnan Province, is one of the important tin-zinc resource bases in China. Skarnization is the most important alteration of the near-ore rock in the ore deposit. In the geological exploration and prospecting process in recent years, The discovery of previously ignored Fu Shan, this type of skarn minerals are mainly distributed in the anhydrous skarn and aqua skarn transitional areas, belong to the product of aqueous skarn stage, and Zn-Cu mineralization is closely related , Can be used as a relevant mineralization prospecting symbol. In this paper, primary, trace and rare earth elements of these minerals were analyzed by LA-ICP-MS. The results show that these elements are enriched in mineral elements such as Zn, Sn, W and Bi, The isomorphic substitution of Mg2 + and Fe2 + in the Kunshanite crystal lattice suggests that a large amount of these ore-forming elements have been enriched in the ore-forming fluids during the wet skarn stage, contributing to the formation of later-stage mineralization. In addition, the REE patterns of this type of minerals are moderate-to-right slope curves with Y / Ho ratios ranging from 22.3 to 34.4, which are similar to the Yanshanian hiding granite in the deep ore area, indicating that the formation of this mineral is closely related to the rock mass.