在大小兴安岭进行航空磁测结果,得到了一副广泛分布着强度很大的杂乱磁场变化图景,经过对许多异常进行地面检查证实,它们都是由强磁性火山岩引起的,包括玄武岩、安山岩、流纹斑岩、粗面流纹岩等.在100米左右的飞行高度上磁异常强度最高可达5000γ,一般都有3000—4000γ,地面最大强度经常都在10000γ以上(丝悬式磁秤超格). Aeromagnetism results were obtained in the magnitudes of the Great and Hinggan Mountains, resulting in a picture of a wide range of disordered magnetic fields widely distributed in intensity. After many anomalies were inspected on the ground, they were all caused by ferromagnetic volcanics, including basalt, andesite, Rhyolite porphyry, rough rhyolite, etc. At a flight altitude of about 100 meters, the magnetic anomaly intensity can reach as high as 5000γ, generally 3000-4000γ, and the maximum ground intensity is always above 10000γ ).