山东招远大尹格庄金矿深部三维可视化建模与定位预测

Three-Dimensional Visual Modeling and Location Prediction of Deep Dayingezhuang Gold Deposit in Zhaoyuan, Shandong

山东招远大尹格庄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。招平断裂带是沿玲珑花岗岩体和前寒武纪结晶基底岩系的侵入接触带而发展、承生、并经多期构造叠加的一条北东向断裂,既属控矿构造,又是导矿和容矿构造,大尹格庄金矿床主要产于招平断裂下盘的碎裂状玲珑花岗岩中,在其上盘的基底岩系中亦有分布,为一典型的破碎带蚀变岩型金矿床。本文以大尹格庄金矿田为研究对象,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、矿体圈定规范和成矿地质规律并结合已知的地震、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,对大尹格庄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。在大尹格庄金矿田共圈定了I、II和Ⅲ号三个可视化立体找矿靶区,为今后深部工作优选区位提供了方向。

The Dayingezhuang gold deposit in Zhaoyuan Shandong is located in the Zhaoyuan-Pingdu Fault Zone (Zhaoping Fault for short) in the Jiaobei uplift area of the North China Plate. Zhaoping Fault Zone is a NE-trending fault developed along the intrusive contact zone of Linglong granite body and Precambrian crystalline basement rock series and subjected multiphase tectonic superposition. It is not only an ore-controlling structure, but also an ore-conducting and ore-bearing structure. The Dayingezhuang gold deposit is a typical fractured zone altered rock type gold deposit, which mainly occurs in the cataclastic Linglong granite of the Zhaoping fractured footwall and is also distributed in the upper wall basement series. Targeting Dayingezhuang gold field as the research object, this paper introduced the three-dimensional geological modeling (3-DGM) and three-dimensional (3-D) visualization technology, to study and explore the 3-D, quantitative and visualization technology of concealed ore body prediction. Therefore, the key technologies such as 3-D morphological analysis of complex geological bodies, simulation of ore-controlling geological factor field, and 3-D quantitative extraction of metallogenic information have been made breakthrough. Also, the method of 3-D visual prediction of concealed ore body is preliminarily formed. Based on exploration engineering data, contouring specification and ore-forming geological regularity and combined with all kinds of data obtained from the known seismic, gravity, magnetotelluric method as the basic data of the deep geological structure research, the deep mineralization structure was reconstructed in 3-D, and the deep mineralization space and 3-D ore-forming information were analyzed and extracted. Further, the 3-D quantitative ore-forming prediction has been carried out. And on this basis, the 3-D quantitative metallogenic prognosis model is established. Finally, two visualized and stereoscopic prospecting targets I and II are delineated in the Dayingezhuang gold mine, which provided information for the optimal location of deep work in the future.