摘要
通过对广山―江藻锌多金属矿区大比例尺地质矿产填图、土壤地球化学测量、高精度磁测以及可控源音频大地电磁测深等,了解矿区含矿构造蚀变带分布、地球化学元素组合特征及深部控矿断裂的延伸情况。矿区土壤发育Zn、Cu、Pb、Ag、As、Sb、W、Sn、Bi等组合异常,异常强且套合好;地磁场基本为平缓正值场区,花岗岩与碳酸盐岩地层接触交代矽卡岩矿化蚀变带磁性总体不强,一般为40~80nT,构成NE向条带,但局部含矿地段显示为较强正磁异常;CSAMT测量较好地反映深部构造特征,显示在矽卡岩蚀变带深部-500^-1000m存在NE向低阻断裂带及近直立长条状低阻体。土壤地球化学、高精度磁法测量及CSAMT测量综合应用较好地圈定了矿区找矿地段,为下一步验证提供参考。
After a series of works such as large scale geology and mineral resource mapping,pedogeochemical survey, high precision magnetic measurement and controlled-source audio frequency magnetotelluric (CSAMT)measurement in Guangshan-Jiangzao zinc polymetallic mining area,the author ascertains the dis-tribution of ore-bearing structural alteration zones,combined characteristics of geochemical elements and ex-tension of deep ore-controlling fractures.Composite anomalies of Zn,Cu,Pb,Ag,As,Sb,W,Sn and Bi develop in the soils of the mining area,and the anomalies are strong and coincide with each other.The geo-magnetic field is basically a flat positive magnetic field area,the magnetism of skarn mineralized alteration zone contacted and alternated by granite and carbonatite is not strong,ranging from 40 to 80nT,and forms a NE-trending belt,where in parts ore-bearing sections show relatively strong positive magnetic anomalies. CSAMT measurement preferably reflects the characteristics of deep structures,and shows that a NE-tren-ding low resistivity fracture belt and a nearly vertical elongated low resistivity body occur at the depth of-500^-1000m in deep part of skarn alteration zone.The author concluded that the integrated application of pedogeochemical survey,high precision magnetic measurement and CSAMT measurement can preferably block out prospecting sections in the mining area and provide reference for verification in the future.
出处
《矿产与地质》
2015年第5期670-674,共5页
Mineral Resources and Geology
基金
中国地质调查局地质大调查项目(编号:1212010011730)资助
关键词
锌多金属矿
物化特探征
找矿前景
广山―江澡
浙西北
zinc polymetallic deposit,geophysical and geochemical characteristic,prospecting potential,Guangshan-Jiangzao,northwestern Zhejiang
