云南思茅大平掌铜矿三维地质建模及矿化规律

Three Dimensional Modeling and Mineralization Regularity of Dapingzhang Copper Deposit in Simao County,Yunan Province

大平掌铜矿地处澜沧江火山岩带中南段,属于典型的火山喷流沉积矿床,上、下部分别发育V_1~#块状矿体群及V_2~#细脉—浸染状矿体群。以V_1~#、V_2~#矿体群为研究对象,基于DIMINE三维矿业软件系统,构建了V_1~#、V_2~#矿体群的三维实体模型,发现V_1~#矿体群连续性较差,V_2~#矿体群规模较小。通过钻探/坑探样品化验数据的收集、整理,对两矿体群Cu品位的分布规律进行了统计分析,并沿走向、倾向及厚度方向对两者Cu品位的空间变化特征进行了讨论。结果表明:(1)V_1~#、V_2~#矿体群Cu品位呈明显的几何各向异性,其中V_1~#矿体群矿化沿水平方向具有较强的连续性,V_2~#矿体群局部富集特征显著,矿化在水平方向上连续性较差;(2)总体上,V_1~#、V_2~#矿体群沿水平方向矿化连续性较好而在厚度方向上矿化不均匀。在上述分析的基础上,根据两矿体群Cu品位空间变异性的分析,从三维角度揭示了V_1~#、V_2~#矿体群的矿化空间结构,进一步验证了两者地质特征及成因的不同,为进一步研究大平掌铜矿床的矿化规律提供了重要理论依据。

Dapingzhang copper deposit is a typical volcanic exhalation-sedimentary deposit which is located in middle-south section of Lancang volcanic rock zone. The V1# massive ore-bodies group and V2# veinlet-disseminated ore-bodies group are distributed above and below Dapingzhang copper deposit respectively. Taking the V1# and V2# ore-bodies groups as the study example, the three-dimensional solid models of them are established respectively based on DIMINE three-dimensional mining software, it is show that the continuity characteristics of the former is poor, and the scale of the later is small. Based on the collection and analysis of the chemical tests data of the samples collected in drilling and pitting engineering,the distribution regularities of Cu grade of V1# and V2# ore-bodies groups are discussed in detail, and the spacial variation characteristics of Cu grade in the directions of strike, tendency and vertical are analyzed in depth. The results show that：（1）the Cu grade of V1# and V2# ore-bodies groups with the obvious characteristics of geometrical anisotropy, Cu mineralization of V1# ore-bodies group with better continuity in horizontal direction, while the Cu mineralization of V2# ore-bodies group with poor continuity in horizontal direction and the local enrichment of Cu mineralization is significant;（2）in general, the Cu mineralization of V1# and V2# ore-bodies groups in horizontal direction are good, while the Cu mineralization of them are distributed uneven in thickness direction. Based on the above analysis results, according to the analysis re suhs of the spatial variability of Cu grade of V1# and V2# ore-bodies groups , the spatial structure of Cu mineralization of them are reveled from the aspect of three-dimensional, and the difference of geological characteristics and genesis of them are verified, which can provide the important theoretical basis for the study of mineralization regularity of Dapingzhang copper deposit.