深穿透地球化学勘查技术对胶东冲积土覆盖区隐伏金矿的勘查指示  

Indication of deep-penetrating geochemistry for hidden gold deposit in alluvial soil covered area in Jiaodong

作　　者：刘汉粮[1,2,3] 王学求 张必敏[1,2] 张宝匀[1,2] 王强 杨德平 熊玉新 周建 Liu Hanliang;Wang Xueqiu;Zhang Bimin;Zhang Baoyun;Wang Qiang;Yang Deping;Xiong Yuxin;Zhou Jian(MNR Key Laboratory of Geochemical Exploration,CAGS Institute of Geophysical and Geochemical Exploration,Langfang,Hebei 065000,China;UNESCO International Centre on Global-scale Geochemistry,Langfang,Hebei 065000,China;School of Earth and Resources,China University of Geosciences(Beijing),Beijing 100083,China;MNR Key Laboratory of Gold Mineralization Processes and Resources Utilization,Shandong Institute ofGeological Sciences,Jinan,Shandong 250013,China)

机构地区：[1]自然资源部地球化学探测重点实验室,中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000 [2]联合国教科文组织全球尺度地球化学国际研究中心,河北廊坊065000 [3]中国地质大学(北京)地球科学与资源学院,北京100083 [4]自然资源部金矿成矿过程与资源利用重点实验室,山东省地质科学研究院,山东济南250013

出　　处：《地质学报》2023年第5期1683-1700,共18页Acta Geologica Sinica

基　　金：国家自然科学基金项目(编号41903071);国家重点研发计划项目(编号2016YFC0600600);物化探所中央级公益性科研院所基本科研业务费项目(编号AS2022P03);中国地质调查项目(编号DD20221807)联合资助的成果。

摘　　要：胶东是当今世界仅有的探明金资源储量超过5000 t的三个金矿省之一,随着地质勘查程度的不断提高,其找矿方向逐渐由浅表矿转向覆盖区深部隐伏矿。土壤微细粒分离技术是一种能反映深部异常信息的深穿透地球化学勘查技术,已在多种景观区取得成功试验案例。本文选择胶东冲积土覆盖区曲家隐伏金矿及其外围开展土壤微细粒分离技术的勘查试验。结果表明:相比于中国土壤、山东省土壤、烟台市土壤背景值,研究区内Au元素高度富集,区域浓集系数高达2.88,金、银等地球化学异常范围与已知隐伏矿体位置具有很好的对应关系,能够互相印证,且与钻孔原生晕地球化学信息有继承关系。异常形成机理是:深部成矿物质以呈类气体性质的纳米颗粒形式沿断层、地层接触面等宏观裂隙和围岩中的微裂隙等通道在多营力接续作用下迁移至地表,并被地表微细粒土壤捕获形成矿化异常。土壤微细粒分离技术对隐伏金矿的勘查指示取得理想效果,可以应用于胶东冲积土覆盖区地球化学找矿勘查。Jiaodong is one of the three gold provinces with proven gold reserves of more than 5000 tons.With the continuously increasing degree of geological exploration,there are fewer and fewer surface and shallow deposits,and the deep and covered areas have become the key focus of ore prospecting in this area.The fine-grained soil prospecting method,a deep-penetrating geochemistry method that can recognize the anomaly information coming from the deep orebodies,has been successfully used for mineral exploration in the covered areas.In this paper,the fine-grained soil prospecting method was carried out in the Qujia concealed gold deposit and its periphery area which is located in the Laizhou City,Shandong Province and covered by alluvial soil.The results show that:①the content of Au is significantly higher than that of Chinese,Shandong Province,and Yantai City soils,and the regional concentration coefficient is as high as 288,indicating that Au is highly enriched in the study area;②the range of Au and Ag geochemical anomalies has a good corresponding relationship with the known hidden orebodies,which can confirm each other,and have an inheritance relationship with the geochemical information of the primary halo of the borehole.A potential genesis mechanism of the anomalies is as follows:the deep ore-forming materials migrate to the surface under the action of multi-agent relay in the form of nanoparticles with gas-like properties along macro-fractures such as faults and stratum contact surfaces and micro fractures in surrounding rocks,and are captured by surface fine-grained soil to form mineralization anomalies.Satisfactory results have been obtained in the validity experiments of fine-grained soil prospecting method,which can be applied to geochemical exploration in the alluvium-covered area of Jiaodong.

关 键 词：深穿透地球化学 土壤微细粒分离技术 曲家金矿 冲积土覆盖区 胶东 

分 类 号：P618.51[天文地球—矿床学] P632[天文地球—地质学]