云南北衙地区成矿地球化学特征及找矿方向

利用北衙整装勘查区1∶20万水系沉积物地球化学数据,综合分析了地层、岩浆岩、典型矿床主要成矿元素Ag、Au、Cu、Pb、Zn的富集规律,对元素分布特征、综合异常特征、相关性及异常元素组合特征进行初步研究,确定了找矿有利指标组合;通过对比北衙金矿区典型矿床成矿地质、地球化学特征,结合地层、岩浆岩等找矿标志预测北衙地区的找矿远景区。结果表明:综合区域上的地层、构造、岩浆岩和区域矿产等资料,对成矿元素异常组合进行地球化学分区是可行的,能有效反映致矿异常,突出矿化信息;根据区域单元素Au、Ag、Pb、Zn、Cu地球化学特征以及组合元素异常特征结合成矿地质背景,指出了炭窑金矿、铅锌矿找矿靶区;马鞍山北部金矿找矿靶区,为北衙整装勘查区外围找矿提供了指导作用。

Geochemistry and ore-prospecting targeting in Beiya area, Yunnan Province

Abstract: According to the?1: 200000 geochemical data obtained from Beiya area and analysis of the?enrichment regularity of?main ore?forming elements of?Ag, Au, Cu, Pb, Zn, the authors studied the?element distribution features, anomaly?characteristics, correlation and abnormal?element composition, and determined the?favorable prospecting?composite?index. Through the comparison of the?typical?metallogenic geological and geochemical characteristics of the Beiya gold ore district, combined with the?formation, magmatite?and other criteria,?the prospecting area was predicted. The results?show that, through an integrated?study of the?regional formation, structure, magmatite?and mineral resources data, the establishment of the?ore-forming elements?anomaly?zoning?is feasible, which can effectively reflect the?anomalies and highlight the mineralization information. According to?the regional metallogenic setting of?single?elements Au, Ag, Pb, Zn, Cu?and the combination of?elements?geochemical characteristics of anomalies, the target areas for further exploration were delineated, which provides?guidance?for ore prospecting.