电、磁综合方法在云南北衙铁金矿勘查中的应用

The application of integrated geophysical methods of magnetic survey and AMT to the exploration of the Beiya gold deposit

北衙金矿位于西南三江富碱斑岩成矿带区域,地质构造复杂,华里西期海相玄武岩和喜山期富碱斑岩极为发育;前者普遍具有热液型铜矿化,后者与金、铁、铅、锌、银等多金属矿床具有密切成因关系。本文针对北衙铁金矿,利用高精度磁测圈定的磁异常,结合音频大地电磁法,两种方法互补,遵循"从已知矿床到未知的原则",紧密结合地质资料,较好地探测深部地质构造以及矿体的空间位置,为工程布置提供了有力的指导。

The Beiya gold deposit is located in southwest Sanjiang alkali porphyry belt with complex geological structure,welldeveloped Variscan marine basalt and Himalayan alkali-rich porphyry.The Variscan marine basalt generally contains the hydrothermal mineralization,whereas the Himalayan alkali-rich porphyry has a close relationship with gold,iron,lead,zinc,silver.With the Beiya iron gold deposit as the study object,the authors utilized the magnetic anomalies delineated by high resolution magnetic survey in combination with audio magnetotelluric method,（the two methods are mutually complementary）,followed the principle of ＂from known to unknown＂,and depended on geological data.As a result,deep geological structure and spatial location of the orebody were detected,which can provide a strong guidance for the project layout.