三江中段侵入岩航磁异常特征及找矿作用

AEROMAGNETIC ANOMALY CHARACTERISTICS OF THE CENTRAL PART OF SANJIANG AREA AND THEIR ROLES IN ORE-PROSPECTING WORK

根据西南三江中段维西—宁蒗地区1∶20万高精度航磁勘查结果,对比已知中酸性侵入岩体的磁异常特征,发现多处磁异常与已知中酸性岩体相对应,结合物性及地质、重力、化探等资料新圈定数十处近地表或隐伏的中酸性侵入岩。通过对这些岩体与已知矿产的关系分析认为,中酸性侵入岩与金、银、铜、铅、锌多金属矿产关系密切,因此,这些侵入岩体是间接寻找上述矿产的有利地带。

Based on 1：200 000 high-precision aeromagnetic survey in Weixi-Ninglang area along the central part of the Sanjiang region and a comparison with the magnetic anomaly characteristics of the known intermediate-acid intrusive bodies, the authors have found that quite a few magnetic anomalies are consistent with the known intermediate-acid intrusive bodies. In combination with physical characters and geological, gravity and geochemical data, tens of shallow or concealed intermediate-acid intrusive bodies were delineated. An analysis of the relationship between these rock bodies and known ore resources reveals the close relationship between the intermediate - acid intrusive bodies and Au, Ag, Cu, Pb, Zn polymetallic ore resources. It is thus concluded that these intrusive bodies serve as favorable areas in search for these ore resources.