东秦岭西官庄—镇平断裂带两侧金矿成矿地质特征及找矿潜力

Metallogenic Geological Characteristics and Prospecting Potential of the Gold Deposit on the Both Sides of Xiguanzhuang-Zhenping Fault Zone in East Qinling

西官庄—镇平断裂带延伸于豫陕两省边界至南阳盆地之间,隶属于商丹断裂带这一重要的贵金属成矿带。通过对整个断裂带的调查研究以及对韭菜沟—母熊山区域的重点研究,分析了东秦岭西官庄—镇平断裂带两侧(研究区)区域地球化学特征、区域矿产特征以及成矿地质特征,并总结了找矿标志。研究表明:(1)金矿脉主要受西官庄—镇平断裂带的次级构造控制;(2)西官庄—镇平断裂带及其次级构造使得成矿元素及伴生元素进一步发生活化、迁移,随着物理化学条件的改变,Au及其他伴生元素在有利部位发生沉积和富集,从而形成金矿床;(3)西官庄—镇平断裂带的次级构造叠加了以Au为主的化探异常和高阻、高极化物探异常,往往直接指示了矿体的赋存位置;(4)研究区与老湾金矿区具有相似的大地构造位置、矿化蚀变特征以及物化探异常特征。在上述分析的基础上,在研究区内圈定了3处找矿靶区,并在靶区内发现了矿(化)点或大比例尺物化探综合异常等找矿线索,各靶区均具有较大的找矿潜力,值得进一步开展工作。

=Xiguanzhuang-Zhenping fault zone belongs to Shangdan fault zone,which is an important precious metal metallogenic belt,extending from the boundary between Henan and Shaanxi Province to Nanyang Basin.Through the investiga- tion of the whole fault zone and the key research of Jiucaigou-Muxiongshan area,the regional geochemical characteristics,re- gional resources characteristics and metallogenic geological characteristics of the both sides of Xiguangzhuang-Zhenping fault zone (study area)are analyzed,and prospecting indicators of the study area are summarized.The study resuhs show that:①gold ore veins in the area are mainly controlled by the secondary structure of Xiguanzhuang-Zhenping fault zone;②further activa- tion and migration of the metallogenic elements and associated elements are caused by Xiguanzhuang-Zhenping fault zone and its secondary structures,with the change of physical and chemical conditions,the metallogenic elements and associated ele- ments are deposited and enriched in favorable areas,thus the gold deposit is formed;③the occurrence location of orebodies can be directly indicated by the geochemical anomalies and geophysical anomalies with high resistivity and high polarization that are superimposed by secondary structures of Xiguanzhuang-Zhenping fault zone and dominated by gold element ;④by compari- son anaIysis,the study area and Laowan gold deposit have similar characteristics of geotectonic location,altered characteristics and geophysical and geochemical anomalies.Based on the above stildy results,three prospecting target areas in the study area are delineated,and the prospecting clues such as mineralized points and geophysical and geochemical anomalies with large scale are found in the prospecting target areas,which show that the prospecting potential of them is good,they are worth con- ducting further prospecting and exploration work.