The effects of applying high precision magnetic survey to geological mapping in Altay glacial till covering area
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摘要: 在阿尔泰高纬度冰碛物等覆盖区,通过分析岩石磁性资料,调查区岩石磁性差异明显,初步建立地质体磁异常识别标志,磁场划分为三大区,Ⅰ?1高平稳场区与黑云花岗岩体对应,Ⅰ?2高跳跃场区反映了志留纪深变质岩区的分布,Ⅱ中等平稳场区对应二云母花岗岩,Ⅲ低磁场区是震旦系—下寒武统弱—无磁的浅变质岩的反应;推断北西、北东向两组隐伏断裂构造8条,为本区构造格架的建立提供了物探依据,地面高精度磁测在覆盖区辅助地质填图效果良好,在实际地质填图中起到了指导作用。Abstract: In the Altay high latitude glacial till covering area, an analysis of rock magnetic data shows that magnetic properties of rocks are different from each other conspicuously. The magnetic anomaly identification marks have been established preliminarily. The mag?netic field can be divided into three districts:Ⅰ?1 high stability zone corresponding to biotite granite, andⅠ?2 highly jumping magnet?ic field zone reflecting the distribution of Silurian hypometamorphic rocks; Ⅱ medium stability magnetic field zone corresponding to two?mica granite; Ⅲ low magnetic field zone representing the reflection of Sinian?Cambrian weak to non?magnetic epimetamorphic rocks. Eight NW?and NE?trending concealed faulted structures were determined through deduction. The results achieved by the author provide geophysical basis for the construction of the structural framework of this area. The ground high?precision magnetic survey is ef?fective in supplementary geological mapping of the glacial till covering area and plays a guiding role in practical geological mapping.
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