云南都龙锡锌多金属矿床三维空间矿化分带研究

Research on the Mineralization Zoning in Three-dimensional Space of Dulong Sn-Zn Polymetallic Deposits,Yunnan

云南都龙锡锌多金属矿床不但锡、锌等主要金属储量规模巨大,矿床伴生分散元素铟和镉的储量也非常可观。以矿区勘查形成的570组主量、微量元素分析数据为研究对象,在样品三维空间定位的基础上,进行了元素聚类分析和空间分带研究。聚类分析结果显示Ag-Cu-As聚为一类,为近矿的中低温元素组合;Zn-Cd-S-In-Sn聚为一类,为多金属硫化矿元素组合;Ga、Ge与其它元素相关性差。在倾向—垂向、走向—垂向方向对Sn、Zn、Cd、Ga、Ge和In元素分带指数进行了复合作图,结果显示,Zn元素在矿体及以上层位复合分带指数高,Sn元素在矿体及以下层位复合分带指数高,两元素成矿既有呈层分布的特征,又有垂向穿层的特征,推测是多期成矿作用叠加的结果。Cd空间富集规律与Zn一致,推测Cd主要赋存在铁闪锌矿的晶格中。Ga的富集与花岗岩空间位置关系密切。Ge和In富集层位稳定且与主矿体重合度高,推测Ge和In元素随多金属硫化物一起成矿。

Yunnan Dulong Sn-Zn polymetallic deposits has large reserves of major metals such as Sn and Zn,and the reserves of associated scattered elements such as In and Cd in the deposits are also considerable.Based on the three-dimensional spatial positioning of samples,the cluster analysis and spatial zoning of 570 groups of main and trace elements analysis data formed by mining exploration were studied.Cluster analysis results show that Ag-Cu-As is clustered into one group,which is the low and medium temperature element association near the ore;Zn-Cd-S-In-Sn is clustered into group of polymetallic sulphide ore elements,and Ga and Ge have poor correlation with other elements.Composite mapping of the zoning indices of Sn,Zn,Cd,Ga,Ge and In elements in the dip-vertical and strike-vertical directions was carried out.The results show that the Zn has a high composite zoning index in the ore body and above,and the Sn has a high composite zoning index in the ore body and below.The two-element mineralization has both the characteristics of layer distribution and the characteristics of vertical layering,which is supposed to be the result of superposition of multi-stage mineralization.The spatial enrichment law of Cd is consistent with that of Zn,it is speculated that Cd mainly occurs in the lattice of marmatite.The enrichment of Ga is closely related to the spatial position of the granite.Ge and In enrichment layers are stable and have a high degree of coincidence with the main orebody,it is speculated that Ge and In are mineralized together with polymetallic sulfides.