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地质人員最熟悉的罗盘,就是一种最簡单的“磁法勘探仪器”。不少强磁性的铁矿,常是由于“罗盘失灵”的线索而被找到的。罗盘的指針本来是指北的,但在有强磁性体的地方就不一定再指北,用物探的术語說,这就是有了“磁异常”。“磁异常”是磁法勘探借以完成地质任务的基础。本章着重說明什么是磁异常;磁异常是怎样产生的;怎样推断解释磁异常以及磁法勘探应用的范围等等。
Geological staff most familiar compass, is one of the most simple “magnetic exploration equipment.” A lot of ferromagnetic iron ore is often found due to the “compass failure” clues. Compass pointer originally refers to the North, but there is not necessarily a place in the ferromagnetic North, in geophysical terms, this is the “magnetic anomaly.” “Magnetic anomaly” is the basis of magnetic exploration to accomplish geological tasks. This chapter focuses on what magnetic anomalies are, how magnetic anomalies are generated, how to infer magnetic anomalies and the range of magnetic exploration applications, and more.