| 内蒙古浩尧尔忽洞金矿三维建模与深部成矿预测 |
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| 引用本文： | 李楠,曹瑞,叶会寿,李强,王义天,吕喜平,郭娜,苏元祥,郝建瑞,肖扬,张帅,楚文楷.内蒙古浩尧尔忽洞金矿三维建模与深部成矿预测[J].地学前缘,2021,28(3):170-189. |
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| 作者姓名： | 李楠 曹瑞 叶会寿 李强 王义天 吕喜平 郭娜 苏元祥 郝建瑞 肖扬 张帅 楚文楷 |
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| 作者单位： | 1.自然资源部成矿作用与资源评价重点实验室; 中国地质科学院 矿产资源研究所, 北京 1000372.中金黄金国际资源有限公司内蒙古太平矿业有限公司, 内蒙古 乌拉特中旗 0153083.中国地质大学(北京) 研究生院, 北京 1000834.成都理工大学 管理科学学院, 四川 成都 6100595.四川省冶金地质勘查院, 四川 成都 610051 |
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| 基金项目： | 国家自然科学基金项目(41972311);国家自然科学基金项目(41672330);内蒙古太平矿业有限公司乌拉特中旗浩尧尔忽洞金矿成矿规律与找矿预测研究项目;中国地质科学院矿产资源研究所基本科研业务费项目(KK2007) |
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| 摘 要： | 内蒙古浩尧尔忽洞金矿位于华北克拉通北缘,是我国黑色岩系金矿的典型代表,其赋存于白云鄂博群比鲁特组的碳质板岩中,品位低而可采储量大。针对金矿增储保障问题,本文以矿床模型和“三位一体”找矿预测方法为指导,采用三维建模可视化技术,首先,构建了浩尧尔忽洞金矿三维找矿模型,实现了矿区的透明化、立体化;其次,开展了地球物理电磁联合反演,重新解译了研究区地质构造格架;第三,提取了浩尧尔忽洞褶皱南翼剪切带、比鲁特组碳质板岩、以及矿区东采坑控矿构造、地球化学晕以及蚀变矿物等预测变量并建立了综合异常三维模型;最后,运用证据权方法,开展综合信息定量预测评价,圈定了深部成矿有利地段,并在地质认识上得到了较好的印证。研究表明:本区高极化率位置应为哈拉霍疙特地层(H3),岩浆岩侵入自两侧以岩墙形式,顺较大的剪切破碎带充填,而碳质板岩恰好为矿体提供了化学屏障;基于证据权计算结果,浩尧尔忽洞褶皱南翼东段深部极有可能存在第二个成矿富集段,具有较大找矿潜力;同时,通过证据权蒙脱石预测变量的对比度分析,定量地验证了构造控制下的流体充填与交代(蚀变)是形成浩尧尔忽洞金矿的重要机制的认识。
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| 关 键 词： | 深部三维预测 三维建模 异常提取 综合成矿预测 黑色岩系金矿 |
| 收稿时间： | 2021-03-20 |
Three-dimensional modeling and comprehensive quantitative mineral resources assessment: A case study of the Haoyaoerhudong gold deposit in Inner Mongolia |
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| LI Nan,CAO Rui,YE Huishou,LI Qiang,WANG Yitian,LÜ,Xiping,GUO Na,SU Yuanxiang,HAO Jianrui,XIAO Yang,ZHANG Shuai,CHU Wenkai.Three-dimensional modeling and comprehensive quantitative mineral resources assessment: A case study of the Haoyaoerhudong gold deposit in Inner Mongolia[J].Earth Science Frontiers,2021,28(3):170-189. |
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| Authors: | LI Nan CAO Rui YE Huishou LI Qiang WANG Yitian LÜ Xiping GUO Na SU Yuanxiang HAO Jianrui XIAO Yang ZHANG Shuai CHU Wenkai |
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| Institution: | 1. MNR Key Laboratory of Metallogeny and Mineral Assessment; Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China2. Inner Mongolia Pacific Mining Co., Ltd., Wulatezhongqi 015308, China3. Graduate School of China University of Geosciences(Beijing), Beijing 100083, China4. School of Management Science, Chengdu University of Technology, Chengdu 610059, China5. Sichuan Institute of Metallurgical Geology and Exploration, Chengdu 610051, China |
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| Abstract: | The low-grade Haoyaoerhudong gold deposit in the Urad Middle Banner, Inner Mongolia, China is one of the largest gold deposit in the northern margin of the North China Craton. The gold orebodies are hosted by carbonaceous slate in the Bilute Formation of the Mesoproterozoic Bayan Obo Group. To enhance security of national gold mineral reserves, we conducted gold prospecting in the Haoyaoerhudong gold deposit through examinations of ore geology, lithology, metallotectonic system, and mineralization indicators. First we constructed a 3D prediction model for the Haoyaoerhudong gold deposit by 3D modeling. Next, inverted CSAMT data were used to interpret and redefine the structural framework of the orefield, including the Haoyaoerhudong syncline—a major ore-controlling structure. From the above results, predictor variables were extracted—such as the shear zone on the south side of the Haoyaoerhudong syncline, the Bilute carbonaceous slate, and the ore-controlling structure and geochemical and alteration indicators of the east pit—and an integrated 3D geological anomaly model was constructed. Finally, the weight of evidence (WOE) method was used to target the favorable deep gold mineralization areas. Our study demonstrates that the high susceptibility value area is the Halahoghous Formation (H3), into which magmatic rocks intruded and filled from both sides along the larger shear fault zone in the form of dikes while carbonaceous slates provided a chemical barrier for gold orebody. Based on the WOE result, we targeted the favorable deep ore field at the east section of the south side of the Haoyaoerhudong syncline. In addition, contrast analysis of montmorillonite prediction variables using WOE provided quantitative verification to show that geological inference of filling and metasomatism under geological structural controls is one of the most important formation mechanism of the Haoyaoerhudong gold deposit. |
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| Keywords: | 3D deep prediction 3D modeling anomaly extraction synthetic metallogenic prognosis black rock series gold mine |
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