胶东典型含矿构造岩相带的地质-地球物理信息预测方法与找矿实践

发布时间：2018-10-18 17:45

【摘要】：地质与地球物理相结合的隐伏矿床定位预测是矿产勘查领域的世界性难题,相关的理论与技术是研究热点。构造是成矿的决定性因素,准确识别控矿构造是预测成功的首要条件,有利的成矿构造部位就是含矿的构造岩相带。依据构造岩相标志及其物性参数特点,提出了面向找矿预测目标的矿床地球物理类型划分方案。摆脱经济指标对矿体范围的限制,将更大规模的含矿构造岩相带作为预测目标,提高了物探方法的识别精度,预测成功率随之显著提高。选择胶东金矿集区内受断裂构造控制的焦家、蓬家夼、七宝山3个典型金多金属矿田,具体介绍了该预测方法的操作程序。首先,在详细的地质观察测量基础上,分析成矿规律,识别含矿构造岩相带,建立成矿地质模型。然后,测量含矿地质体的物性参数,研究其分布规律和影响因素,进而选择有效的地球物理方法和观测系统,完成数据采集、处理和解释,建立地质-地球物理勘查模型,优选找矿靶区靶位。最后,实施工程验证,取得良好的找矿效果。
[Abstract]:The location and prediction of concealed deposits combined with geology and geophysics is a worldwide problem in the field of mineral exploration, and the related theories and techniques are the focus of research. Structure is the decisive factor of metallogenesis, and the accurate identification of ore-controlling structure is the first condition of successful prediction, and the favorable ore-forming structure is the metallogenic tectonic-lithofacies zone. According to the characteristics of tectonic lithofacies and their physical parameters, a scheme for the classification of geophysical types of ore deposits is proposed for the purpose of prospecting and prediction. In order to get rid of the limitation of economic indexes on the scope of orebody and take the ore bearing tectonic facies belt as the prediction target, the recognition accuracy of geophysical prospecting method is improved, and the success rate of prediction is improved significantly. Three typical gold polymetallic ore fields, Jiaojia, Pengjiakuang and Qibaoshan, which are controlled by fault structures in Jiaodong gold concentration area, are selected. The operation procedure of the prediction method is introduced in detail. Firstly, on the basis of detailed geological observation and survey, the metallogenic law is analyzed, and the metallogenic geological model is established by identifying the metallogenic tectonic lithofacies zone. Then, the physical parameters of ore-bearing geological bodies are measured, the distribution law and influencing factors are studied, and then effective geophysical methods and observation systems are selected to complete the data collection, processing and interpretation, and to establish the geological geophysical exploration model. The target position of the optimum selection prospecting area. Finally, engineering verification is carried out and good prospecting results are obtained.
【作者单位】：中国科学院地质与地球物理研究所中国科学院矿产资源研究重点实验室;中国科学院大学;
【基金】：中国科学院地质与地球物理研究所自主创新研究项目(31351460)
【分类号】：P612

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