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根据青海省1:100万航磁化极平面异常图反映,在哈拉湖北西地区有一高强度航磁异常带存在,局部地段见有超基性岩体出露,但出露面积岩体规模有限。中—酸性岩体—二长花岗岩在异常范围内断续出露,根据航磁异常特征推断,该异常是由隐伏的中—酸性岩体—二长花岗岩引起,并用航磁带异常二阶导数零等值线圈出了二长花岗岩体的分布范围;推断北西西向深部断裂一条。这一发现,对研究中、南祁连地质构造演化及地质找矿具有实际指导意义。
According to the anomaly map of 1: 1 million airlines in Qinghai Province, there is a high-strength aeromagnetic anomalous zone in the northwestern area of Hala Lake. Excess ultramafic rocks are found in some areas, but the area of exposed rock mass is limited . The intermediate - acidic rock - monzogranite intermittently exposed in the anomaly range. Based on the anomalous characteristics of aeromagnetic anomalies, the anomaly was caused by the concealed medium - acidic rock - monzogranite. The anomalous second derivative Zero-value coil out of the distribution of the two long granite body; inferred a deep fault from northwest to west. This finding has practical guiding significance for the study on the geological tectonic evolution and geological prospecting in South Qilian.