山东招远夏甸金矿深部三维成矿可视化定位预测

招远夏甸金矿床位于华北板块之胶北隆起区内的招远-平度断裂带(简称招平断裂)中。招平断裂沿玲珑花岗岩体与前寒武纪结晶基底岩系的接触面展布,既是控矿构造,又是导矿和容矿构造,夏甸金矿床主要产于断裂下盘的碎裂状玲珑花岗岩中,在其上盘的基底岩系亦有分布,为一典型的破碎带蚀变岩型金矿床。该文以夏甸金矿田为研究对象,引入三维地质建模(3DGM)及三维可视化技术,研究探索隐伏矿体预测的三维化、定量化及可视化技术,重点突破了复杂地质体三维形态分析、控矿地质因素场模拟、成矿信息三维定量提取等关键技术,初步形成了隐伏矿体三维可视化预测的方法。依据勘探工程数据、矿体圈定规范并结合地质规律进行了矿体三维建模,结合已知的地震、重力、大地电磁等方法获得的各类数据作为研究深部地质构造的基本资料,对深部成矿构造进行了三维重构,对夏甸金矿深部进行了矿化空间分析和三维成矿信息提取,开展了三维定量成矿预测,在此基础上建立了三维定量成矿预测模型。在夏甸金矿田共圈定了Ⅰ号、Ⅱ号两个可视化立体找矿靶区,为今后深部工作优选区位提供了信息资料。

3D Visual Orientation Location Prediction in Deep Part of Xiadian Gold Deposit in Zhaoyuan City of Shandong Province

Xiadian gold deposit in Zhaoyuan city is located in Zhaoyuan Pingdu fault zone in Jiaobei uplift area of North China plate. Zhaoping fault distributes along the contact surface between Linglong granite body and Precambrian crystalline basement rock series, which is not only orecontrolling structure, but also oreguiding and orehosting structure. Xiadian gold deposit occurs mainly in the fractured Linglong granite in the lower wall of the fault, and the basement rock series in the upper wall is also distributed. It is a typical fractured zone altered rock type gold deposit. Taking Xiadian gold field as the research object, by introduing threedimensional geological modeling (3DGM), threedimensional visualization technology, quantitative and visualization technology of the prediction of hidden ore bodies have been studied, key technologies, such as threedimensional morphological analysis of complex geological bodies, field simulation of orecontrolling geological factors and threedimensional quantitative extraction of metallogenic information are mainly broken through, and threedimensional visualization prediction method of hidden ore bodies has been preliminarily formed. Based on exploration data, ore body delineation criteria and geological regularities, threedimensional modeling has been carried out. Combining with known seismic, gravity and magnetotelluric data, threedimensional reconstruction of deep metallogenic structures has been carried out, and the mineralization spatial analysis and threedimensional metallogenic information extraction of deep part in Xiadian gold deposit have been carried out. On the basis of threedimensional quantitative metallogenic prediction, a threedimensional quantitative metallogenic prediction model has been established. Two visualized threedimensional prospecting targets have been delineated in Xiadian gold field. It will provide some references for optimizing the location of deep work in the future.