浙西北杜家东坞斑岩型钼矿床特征及找矿前景分析  

Geological Characteristics and Prospecting Potential of the Dujiadongwu Porphyry Molybdeum Deposit in Northwestern Zhejiang Province

作　　者：张建芳 解怀生 龚瑞君 许新苗 高海发 

机构地区：[1]浙江省地质调查院,浙江杭州311203

出　　处：《地质与勘探》2012年第2期297-304,共8页Geology and Exploration

基　　金：中国地质调查局地质大调查项目(编号:1212010011730)资助

摘　　要：杜家东坞钼矿床位于钦杭成矿带北东端绍兴夏履桥-萧山浦阳火山构造洼地,成矿与青化山破火山口-龙角尖火山通道构造活动关系密切;钼矿化呈细脉浸染状赋存于火山通道周围的火山(角砾)岩裂隙及断裂中,成矿与钾化、硅化、黄铁矿化、磁铁矿化蚀变关系密切;矿床成因类型为斑岩型钼矿床。综合分析矿区成矿地质背景、矿化蚀变特征、地球物理特征及地球化学特征,认为在火山通道环形张性断裂与北西向断裂裂隙带、低阻带及中低阻过渡高极化带、磁异常零值区、负值区或正负值交界处等区域有望找到富矿体,龙角尖火山通道的深部有望找到小斑岩体,这说明在浙西北火山岩区具有寻找斑岩型矿床的良好前景。The Dujiadongwu Cu-Mo deposit is located in the Xialvqiao-Xiaoshan Puyang volcanic- structure sag northeast of the Qinghang metallo- genic belt, Shoaxing, Zhejiang Province. Its mineralization is intimately related to the Qinghuashan caldera-Longjiaojian volcanic conduit structure. Based on the integrated analysis of geological setting, alteration, geophysical and geochemical characteristics, the regional metallogenic regularity and prospecting indicators are summarized as follows. The areas, including joint space of extension faults in the volcanic conduit, N-W faults, joints and crack belt, contact zone of low and moderate resistivity, zero-value aeromagnetic anomaly district, boundary district of negative and positive aemmagnetic anomalies, high gradient induced polarization district, are the potential places for finding high-concentration ore bodies or veins. Small porphyry intru- sions and porphyry deposits likely exist at depth in the Longjiaojian volcanic conduit.

关 键 词：矿床特征 斑岩型钼矿 钦杭成矿带 杜家东坞 浙江 

分 类 号：P618.41[天文地球—矿床学] P618.65[天文地球—地质学]