交鲁山—东天山火山岩带HS-8金异常查证

交鲁山—东天山火山岩带位于大兴安岭德尔布干成矿带东北端,1∶5万水系沉积物测量圈出了一处显示Au成矿潜力的HS-8化探组合异常,运用大比例尺土壤地球化学测量、激电中梯测量方法,对可能导致HS-8化探组合异常的深部隐伏控矿构造及矿化蚀变进行了查证。查证结果:共圈定地球化学组合异常6处,推断断裂构造4条;对1∶2万土壤地球化学测量、激电中梯测量异常进行了槽探工程验证,并根据化学样分析结果圈出了6条金矿(化)体。研究表明,激电中梯测量视极化率(ηs)异常主要与黄铁(褐铁)矿化有关,成矿元素金在英安岩和流纹岩中具有明显的富集趋势,这两种岩石可能为金矿化提供了物质来源。

Investigation of HS - 8 anomaly in the Jiaolushan,Dongtianshan volcanic belt

The Jiaolushan-Dongtianshan volcanic belt is located in the northeastern end of the Derbugan metallo- genic belt in Greater Khingan Mountains. The 1：50 000 stream sediment surveys there identified an area of combina- tion anomaly of HS -8 chemical exploration, indicating possibility of gold mineralization. With large scale geochemi- cal soil survey and IP intermediate gradient survey, this paper investigated and verified the deep concealed controlling structure and the mineralized alteration that may cause combination anomaly of HS - 8 chemical exploration. Six areas of geochemical combination anomaly were circled and four fracture structures deduced. Trenching engineering revela- tions were carried out to testify to the 1 ： 20 000 geochemical soil surveys and IP intermediate gradient surveys, and six gold ore bodies were circled based on chemical analysis. The results indicated that the polarizability （7/s） anomaly in IP intermediate gradient surveys was mainly related to pyritization （ferritization） ; the metallogenic element Au had an obvious trend of enrichment in dacite and rhyolite, which may be the material source for gold mineralization.