地、物、化综合方法在豫西小河岩体南缘找矿中的应用

为研究小秦岭南部小河岩体周边的含矿性,选择1∶50000水系沉积物8-乙3 Ag、W、Bi异常、中元古界小河岩体与中元古界官道口群接触带F1断裂开展了地质、物探及化探综合勘查.土壤测量发现了张吉口1-甲3 Ag、Au、Sb、Zn、Pb、As、Co、Cu、Mo、Bi综合异常,各元素套合较好,异常面积大、强度高;其中Ag异常最高值大于20 ppm,具有清晰的三级浓度分带和较强的浓集中心.激电测深预测F1断裂向深部延伸,地表槽探工程在F1构造蚀变带1-甲3异常区发现银矿体,钻孔资料证实深部存在厚大的银铅锌矿体.该矿床的发现实现了小河岩体南缘的找矿突破,也是化探、物探、地质等综合勘查方法应用的典型实例.

The application of the integrated geological,geophysical and geochemical methods to ore-prospecting at the southern edge of Xiaohe rock body in western Henan Province

In order to study the ore-potential of the area around the Xiaohe rock body in southern Xiaoqinling,the authors chose 1 ∶50 000 8-Yi 3AgWBi stream sediment anomaly,Meso-Proterozoic Xiaohe rock body and F1 fault at the contact zone of Meso-Proterozoic Buandaokou Group to conduct geological,geophysical and geochemical integrated exploration.Soil survey led to the discovery of the Zhangjikou 1-Jia 3 Ag Au Sb Zn Pb As Co Cu Mo B composite anomaly characterized by relatively good element combination,large anomaly area and high intensity,in which the highest value of Ag is higher than 20× l0-6,with distinct three-grade concentration zoning and relatively strong concentration center;IP sounding predicted that F1 fault extends downward,surface trenching discovered a silver orebody at 1-Jia 3 anomaly in F1 structural alteration zone,and drilling revealed the existence of a thick and large Ag-Pb-Zn orebody.The discovery of this ore deposit has realized the ore-prospecting breakthrough at the southern edge of Xiaohe rock body,and also serves as a typical example of the application of the geological,geophysical and geochemical integrated exploration.