| 山东牟乳成矿带金青顶矿区三维综合找矿模型的构建及深部预测 |
| |
| 引用本文： | 李金岷,黄鑫,石文杰,王勇军,崔凯,孔凡顺,谭俊.山东牟乳成矿带金青顶矿区三维综合找矿模型的构建及深部预测[J].地质科技通报,2021,40(6):151-164. |
| |
| 作者姓名： | 李金岷 黄鑫 石文杰 王勇军 崔凯 孔凡顺 谭俊 |
| |
| 基金项目： | 山东省煤田地质局2019年度科研专项奖励基金项目鲁煤地科字[2019]4号山东省地勘基金项目鲁勘字(2018)15号山东省自然科学基金面上项目ZR2020MD031 |
| |
| 摘 要： | 探讨山东牟平-乳山成矿带金青顶金矿区成矿元素地球化学场三维分布特征，总结成矿规律，建立三维综合找矿模型，为金矿深部成矿预测提供更为丰富的信息，指导矿山生产与发展方向。针对金青顶矿区深部找矿问题，在全面收集已有地质、矿产资料的基础上，结合野外实地调查，应用三维建模与可视化技术、构造叠加晕及地质统计学理论与方法，构建矿床地质、地球化学场等方面的三维综合找矿模型，将金青顶矿床的预测评价研究拓展到三维空间，揭示了区内成矿地质特征和地球化学异常表征，据此探讨了矿体及地球化学场的三维空间分布规律。并在此基础上，开展了矿区的地质-地球化学综合信息分析与深部预测评价，减少了深部预测的不确定性。矿体三维模型显示，矿体呈现中间宽两端窄的形态，有向深部尖灭的趋势。三维地球化学场分布特征显示，Au、As、Sb、Hg、Cu、W、Sn、Co、Ni元素及组合因子主要分布于矿体浅部，向深部呈现元素场强度下降的趋势；Mo、Bi元素主要分布于矿体深部；Ag、Pb、Zn元素分布较分散，存在多个矿化中心。地质-地球化学三维模型显示，组合因子高得分区域与组合矿物富集区域相符合，Au成矿作用主要发生于矿体浅部，深部成矿作用减弱。应用格里戈良分带指数法求取Ⅱ号金矿体的原生晕垂向分带序列为Sb-Cu-Ni-Au-Sn-W-Hg-As-Co-Ag-Zn-Pb-Mo-Bi，该序列与单一期次成矿垂向分带序列进行对比无明显反常现象，指示Ⅱ号矿体当前开采深度以下成矿潜力不高。研究结果显示，在综合找矿模型指导下，基于三维地球化学空间场晕模型的三维地质、地球化学异常信息的展示、提取与综合分析，可以有效地评价深部成矿潜力，为深部成矿预测研究提供了新思路，有利于指导矿山工作的部署。综合分析认为金青顶Ⅱ号主矿体在-1 200 m以下找矿潜力一般，不宜继续进行大规模的深部探矿。
|
| 关 键 词： | 金青顶 三维地质模型 构造叠加晕 垂向分带序列 深部成矿预测 |
| 收稿时间： | 2020-11-26 |
Three-dimensional comprehensive model and deep prediction of the Jinqingding gold deposit,Muping-Rushan metallogenic belt,Shandong, China |
| |
| Abstract: | The study of the three-dimensional(3D) distribution characteristics of ore-forming element geochemical field in Jinqingding gold deposit, Mouping-Rushan metallogenic belt, Shandong Province, summarizes the metallogenic law and establishes a 3D comprehensive prospecting model. It provides richer information for deep prediction and guides the direction of mine production and development. In this study, 3D modelling of the deposit and its geochemical field was carried out. Guided by the prospecting model of this deposit, the 3D geological bodies and 3D geochemical model of ore bodies were built up in this study based on comprehensive analysis upon the geological and geochemical data in this deposit, by using 3D modelling visualization technology and geostatistics. These models reveal the ore bodies features and geochemical characterization of this deposit. In order to reduce the uncertainty of the deep prospecting information, the 3D modelling of the Jinqingding gold deposit was carried out by the comprehensive information analysis and prediction of geology and geochemistry in the study area. The 3D model of the ore body shows that the ore body is wide in the middle and narrow at ends, and tends to narrow and disappear to the deep. The distribution characteristics of the geochemical field show that the elements and combination factors of Au, As, Sb, Hg, Cu, W, Sn, Co, Ni are distributed in the shallow part of the ore bodies, showing a decreasing trend of element-field strength to the deep. The characteristics of Mo and Bi are distributed deep in the ore bodies. The characteristics of Ag, Pb, and Zn are more scattered and there are multiple metallogenic centers. The 3D model of the combination geochemical field shows that the metallogenesis of gold occurred in the shallow area of the ore bodies, while it weakened in the deep. The results show that guided by the comprehensive prospecting model, the display, extraction and comprehensive analysis of 3D geological and geochemical anomaly information based on the 3D geochemical field model effectively evaluate the potential of deep prospecting and provide the evidences for deep prospecting prediction. The comprehensive analysis results show that the prospecting potential of the No.2 orebody of the Jinqingding gold deposit below -1 200 m is low-expected, and it is inappropriate to continue deep exploration massively. |
| |
| Keywords: | |
|
| 点击此处可从《地质科技通报》浏览原始摘要信息 |
|
点击此处可从《地质科技通报》下载全文 |
|
