湖南雪峰金矿田地球化学异常特征及其指示意义

Characteristics of geochemical abnormal and its indication effect in Xuefeng gold ore field, Hunan Province

雪峰金矿田是近年确立的湖南找金的重点区域。该区金的成矿地质条件优越 ,各类异常均反映了金矿化的存在 ,Au、As是最重要的指示元素 ,两者吻合程度好。异常与断裂构造控制的矿化形态及产状关系密切 ,进一步说明该区金矿是以断裂控矿为主。不同化探方法均具一定的找矿效果 ,所圈定的异常浓度分带清晰 ,指示作用明显。水系沉积物异常指示了找矿地段 ;次生晕异常指示了矿带位置及延伸 ;原生晕异常指示了蚀变矿化带或矿体部位 ;汞气异常能指示含金断裂破碎带或含金石英脉的存在。充分说明地球化学异常对金矿具有重要指示意义。

Xuefeng gold ore field, which has been determined in recent years,is a focusing area for gold finding in Hunan Province.The geologic condition in this area is favorable for gold mineralization.Various abnormities reflect the existence of gold mineralization.Au and As are the most important indicator elements and they are identical.The abnormities are closely related with the mineralization forms and occurrences controlled by the faulted structures,which is a further explanation for the fact that the gold ore in this area is mainly controlled by the faulted structures.Various geochemical prospecting can all be effective for ore finding because the circled abnormal concentration zonings are clear and the indications are obvious.The stream sediment anomalies indicate the plat for ore finding, the secondary dispersion halos anomalies indicate the location of ore zones and their stretches, the primary dispersion halos anomalies indicate the altered mineralization zones or the positions of orebodies, and the mercury anomalies can indicate the existence of faulted fracture zones or quartz veins containing gold.All these have proved that geochemical anomalies are important indications for gold ores.