华北克拉通北缘西段SEDEX型铅锌矿成矿地质信息及综合找矿模型

Metallogenic Geological Information and Integrated Prospecting Model of the SEDEX Type Pb-Zn Deposit in the Western Segment of the Northern Margin of North China Craton

华北克拉通北缘西段的狼山—渣尔泰山矿集区为我国北方具有代表性的中元古代喷流—沉积(Sedimentary exhalative,SEDEX)型矿床成矿带。通过系统分析该成矿带的相关研究成果,首先总结了华北克拉通北缘西段典型矿床的成矿地质条件、地球物理特征、地球化学特征以及勘探研究进展等找矿信息,并从典型矿床的成矿地质条件等角度总结了不同尺度的找矿标志。然后提出了包含查找同沉积期火山岩分布、辨认含矿构造、寻找围岩蚀变、查证物化探异常、实施工程验证等环节的找矿勘探思路,构建了多源信息-多因素耦合综合找矿模型,该模型包含了狼山群第二岩组(Pt2ls2),近矿围岩蚀变(硅化、黄铁矿化、绿泥石化),重力梯度带以及中—高磁性、弱极化、中电阻异常,Cu、Pb、Zn、Ag物化探综合异常等要素,并对区域范围内的找矿远景区进行了圈定。最后通过系统研究近年来国内外典型SEDEX型矿床的勘探研究进展,对华北克拉通北缘西段狼山—渣尔泰山矿集区SEDEX型铅锌矿床后续勘查研究提出了一些建议。

The Langshan-Zha＇ertaishan ore concentration area is located in the western segment of the northern margin of North China Craton,and it is a representative Mesoproterozoic SEDEX deposit metallogenic belt in North China.Based on the systematic analysis of the related study results of the metallogenic belt,firstly,the prospecting information such as metallogenic geological condition,geophysical characteristics,geochemical characteristics and exploration progress of the typical SEDEX deposits in the western segment of the northern margin of North China Craton is summarized,based on the study of metallogenic model,the prospecting indicators with different scales are summarized from the aspects of the metallogenic geological condition of the typical SEDEX deposits.Then,the prospecting process includes finding the distribution of syndepositional volcanic rock,identifying the ore-bearing structures,searching for surrounding rock alteration,verifying the geophysical and geochemical anomalies and conducting engineering verification work are proposed,the multi-source information and multiple factors coupled integrated prospecting model is established,the model includes the factors such as the second rock group of Langshan Formation（Pt2 ls2）,surrounding rock alteration near ore-bodies（silicification,pyritization and chloritization）,gravity gradient belt and high magnetism,weak polarization and medium resistance anomalies,the comprehensive geophysical and geochemical anomalies of Cu,Pb,Zn and Ag,besides that,the prospecting prospective area of the study area is delineated.Finally,through systematic study of the prospecting progress of the SEDEX deposit at home and abroad in recent years,some suggestions about the further prospecting of SEDEX Pb-Zn deposit in Langshan-Zha＇ertaishan ore concentration area in the western segment of the northern margin of North China Craton is given.