河南卢氏苇园沟金矿区地球化学特征与找矿前景分析

GEOCHEMICAL CHARACTERISTICS AND PROSPECTING POTENTIAL OF WEIYUANGOU GOLDFIELD IN LUSHI COUNTY,HENAN PROVINCE

河南卢氏苇园沟金矿区位于华北陆块南缘北秦岭多金属成矿带,出露地层主要为宽坪岩群,瓦穴子断层及其次级断裂横贯矿区,是该区主要控矿构造,区内变质变形作用强烈.在矿区地质特征、矿区地球化学特征研究的基础上,通过元素相关性分析、地球化学元素分布与构造展布研究,发现异常和金矿(化)体与构造在空间上对应关系较好,异常范围有一定位移;宽坪岩群有利于成矿,对岩性具一定选择性.根据元素组合特征判断矿床总体剥蚀较浅.综合认为研究区Au元素单一富集,主成矿元素Au与其他元素相关性较低;Au元素异常主要围绕断裂带分布,金矿(化)体展布严格受构造控制,研究区具较大可能形成单一元素金矿床.

Weiyuangou goldfield of Lushi County,Henan Province,is located in the North Qinling polymetallic metallogenic belt on the southern margin of North China Block,where Kuanping rock group is dominantly exposed.Waxuezi fault and its secondary faults crossing the orefield are the main ore-controlling structures in the area,with strong metamorphism and deformation.Based on the geological and geochemical characteristics of the area,through the element correlation analysis,geochemical element distribution and structural distribution,it is found that the anomalies and gold ore/mineralized bodies are well corresponded to the structure in space,but the anomaly range has a certain displacement.The Kuanping rock group is favorable to mineralization,with certain lithological selectivity.It is considered that the overall denudation of the deposit is shallow according to the element combination characteristics.From above,it is concluded that there is a single enrichment of Au in the area,and the correlation between the main ore-forming element Au and other elements is low.The Au anomalies are mainly distributed around the fault zone.The distribution of gold ore/mineralized body is strictly controlled by structure.Single element gold deposits are possibly formed in the study area.