【作者】 韩学林；

【导师】 陈永清；

【作者基本信息】 中国地质大学（北京） ， 矿产普查与勘探， 2010， 硕士

【摘要】 内蒙古花敖包特铅锌银多金属矿床构造上位于滨西太平洋成矿域,内蒙古大兴安岭成矿带中南段,是一个近年来发现的与白垩纪早期构造岩浆活动有关的隐伏热液脉状矿床。原生晕异常分析得出:成晕组分可以分为:前缘元素(Sb、Cd、Ag、Pb)、近矿元素(Zn、Hg、Cu、In)、尾晕元素(As、Sn、Bi、Mo、W),自矿体头部至尾部,前缘晕元素异常呈逐渐减小,尾晕元素异常呈逐渐增大,原生晕轴向分带和横向分带都较为明显。基于Grigorian分带序列定量计算公式获取的矿床原生晕轴向分带序列(从浅部至深部)为:Sb→Pb→Cd→Ag→Zn→Hg→Cu→In→As→Bi→Sn→Mo→W;分析横向分带得出:其分带序列与轴向分带序列基本一致,Cd、Pb、Zn、Sb、Ag均排在分带序列的前端,表明该五种元素成矿作用强,为矿体的重要指示元素;As、Bi、Mo、W排在了序列的后面,表明该四种元素可能是深部矿化的主要成分。通过聚类分析得出:Zn、Cd、Hg、In、Sn、Cu元素归为一类的相关性水平为0.73,反映出了近矿元素组合特征;Pb、Ag、Sb元素归为一类的相关性水平为0.62,反映出了矿体前缘元素组合特征;Bi、As、Mo、W四个元素分别与其它元素聚为一类的相关性水平均小于0.4,且Mo、W与其它元素聚类时呈现出负相关水平,反映出成矿过程具有多期、多阶段性。基于13种成矿成晕元素的因子分析获取了三个具有成矿意义的元素组合:F1为Pb-Zn-Ag-Hg-Cd-Cu-Sb-Sn-In组合,以Pb-Zn-Ag成矿元素组合为特征的铅锌银矿化阶段;F2为Bi-Sn-In组合,代表了另一次矿化阶段,主要形成Bi、Sn和In硫化物。F3为W-Mo-As组合,推测为W、Mo、As富集为主的热液矿化阶段,这表明该矿床成矿过程至少经历三个不同的矿化阶段。最后构建深部矿体评价指标为(Sb×Pb×Cd×Ag)D /(As×Sn×Mo×W)D,该指标自矿脉的头部至尾部(从浅部至深部)急剧降低,矿体头部(850m标高):1.30→矿体中上部(775m标高):0.35→矿体中下部(645m标高):0.056→矿体尾部(550m标高):0.005,这表明该指标随深度的增加急剧降低,因此能够用于有效地预测深部Pb、Zn和Ag的资源潜力。更多还原

【Abstract】 The Huaaobaote Pb-Zn-Ag Deposit, tectonically located in the mid-southern segment of Da Hinggan Mountains’Ore-forming Belt of Innermongolia, belonging to the circum-Pacific metallogenetic domain, is a discovered recently buried hydrothermal vein deposit and may be associated with early Cretaceous technomagma activities. Depending on the analysis of anomalies of primary halo, elements of primary halo can be divided into three categories: front elements (Sb, Cd, Ag, Pb), nearby elements of ore body (Zn, Hg, Cu, In), trailing elements (As, Sn, Bi, Mo, W). From head to foot of ore body, the anomalies of front elements of primary halo are becoming smaller while the anomalies of tail elements are becoming bigger, meanwhile, both of axial zoning and transversal zoning are obvious. A detailed zonation sequence of indicator elements is obtained using the Grigorian’s method as follows (from up to down): Sb→Pb→Cd→Ag→Zn→Hg→Cu→In→As→Bi→Sn→Mo→W; Based on the analysis of transversal zoning, we can get that the axial zonal sequence is consistent with the transversal zonal sequence. These elements that are at front of the transversal zonal sequence, such as Cd, Pb, Zn and Sb, Ag, are important indicator elements of ore body. Based on cluster analysis, Zn, Cd, Hg, In, Sn and Cu can be put into one group when the level of its correlation coefficient is below 0.73, which represents the combined characteristic of nearby elements of ore body; Pb, Ag and Sb can be put into one group when the level of its correlation coefficient is below 0.62, which represents the combined characteristic of front elements of ore body; Bi, As, Mo and W may be put into one group when the level of correlation coefficient is below 0.4. Furthermore, Mo and W have a little negative correlation with other elements, which reflects that the ore-forming process is a multi-stage process. Three significant ore-forming element associations have been identified from factor analysis basing on 13 kinds of halo-forming elements are as follows. F1[Pb-Zn-Ag-Hg–Cd-Cu -Sb-Sn–In]:association reflects that Pb-Zn-Ag mineralization stage is a main stage. F2 [Bi-Sn-In] association represents sulfides of Bi, In and Sn, which reflects the other hydrothermal mineralization stage; F3 [W-Mo-As] association may reflects another hydrothermal mineralization stage in which the elements of As ,W and Mo are anomalously enriched. These element associations may reflect three different mineralization stages. At the last, a criterion such as (Sb×Pb×Cd×Ag)D /(As×Sn×Mo×W)D can be constructed for evaluating the ore potential in depth. The criterion values are greater than 1.3 on the top portion of the ore deposit, 0.35 in the middle-upper portion, 0.056 in the middle–lower portion and 0.005 at the end portion, which illustrate that these criterion values decrease abruptly with depth and can be used for predicting the potentials of Pb, Zn, and Ag at a given depth.更多还原