Deep Ore Body Targeting Based on 3D Integrated Information
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摘要: 在三维空间中综合已揭露浅部地质和深部地球物理资料进行深部预测，既能深化浅部认识，还能减少地球物理多解性带来的困扰，成为深部成矿预测的新趋势和重要手段.以北衙金矿床万硐山矿段为例，通过收集钻孔、勘探线剖面、化探和地球物理等资料，在三维建模平台中建立了万硐山矿段三维地质模型；基于建模结果，综合地表、浅部和深部重力资料，对成矿地质条件和深部成矿潜力进行了研究和分析，筛选出隐伏断裂、斑岩体和青天堡组砂岩3种成矿有利要素，对应建立了成矿有利区三维体模型（sgrid）.在此基础上，采取多源信息综合方法，对3种成矿控制要素的有利成矿区域取交集，圈定了万硐山矿段海拔1 100~900 m内深部靶区，为周边同类型矿段深部靶区预测提供了参考.Abstract: The combination of subsurface geology and deep geophysics data is a new tendency and method for the mineralizing prognosis of deep zone in the three-dimensional space, of which the results can deepen the cognitions of subsurface feature and reduce risks from multiplicities of geophysical interpretations. Focused on the Beiya gold deposit, 3D visualization of Wandongshan key ore sections was realized by using the GOCAD modeling platform based on the geological, geochemical, and deep geophysical data in this study. Furthermore, metallogenetic regularity and deep metallogenic potential of geological bodies were analyzed, and three favorable factors were screened out for mineralization including hidden faults, beschtauite, and Qingtianbao sandstone.In addition, corresponding sgrid was established. Comprehensive multi-source information synthesis method was adopted to locate deep buried ore body of Wandongshan ore section with an altitude between 1 100-900 m via obtaining results from intersections of three favorable areas for mineralization. This study provides an important reference for the prediction of deep target area in this belt as well as in similar type of ore sections in the surrounding areas.
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图 1 北衙金矿大地构造位置(a)和三维地质图(b)
Fig. 1. The tectonic location (a) and 3D geological map of Beiya gold deposit (b)
图 3 北衙金矿床万硐山矿段正长斑岩-矿体-地层接触关系
a.近景；b.远景
Fig. 3. Spatial coupling relationship of intrusions-ore body-stratum in Wandongshan ore section, Beiya gold deposit
图 4 北衙金矿万硐山矿段地质体三维建模结果
a.矿体金品位模型（黑色为空值）；b.主干断裂三维面模型；c.矿体面模型；d.万硐山三维实体模型栅格
Fig. 4. 3D modeling results of geological bodies in Wandongshan ore section, Beiya gold deposit
图 5 断裂（a）和岩体（b）（70%透明度）与金高品位体的关系
Fig. 5. Spatial coupling relationship between fault plane (a), intrusions (b) (70% transparency) and Au high grade sgrid
图 6 北衙金矿万硐山矿段密度切片(a、b)和富碱斑岩体面模型(c)
Fig. 6. Density slice (a, b) and beschtauite (c) in Wandongshan ore section, Beiya gold deposit
图 8 富碱斑岩有利成矿区
Fig. 8. Favorable area for mineralization of beschtauite in Wandongshan ore block
图 9 深部隐伏断裂有利成矿区
Fig. 9. Favorable area for mineralization of hidden faults in Wandongshan ore block
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