在JX地区,由莫氏界面的起伏只能引起21—42毫伽的重力异常值。然而,在此区却出现了5—70毫伽的重力异常值,从中去除莫氏界面的影响,其剩余异常值还有30—50毫伽。出现这样的重力低异常,应从该区的地质构造和地球物理、化学成因上去分析,结果说明该区有两个大的重力低异常是由两个火成岩体引起的。 In the JX region, the fluctuations caused by the Mohs interface can only cause gravitation anomalies of 21-42 milliamps. However, gravitational anomaly values ​​of 5-70 milligram have been observed in this region, removing the effect of the Mohs interface with residual anomalies of 30-50 milligram. The occurrence of such low gravity anomalies should be analyzed from the geologic structure and geophysical and chemical origin of the area. The results show that two large low-gravity anomalies in the area are caused by two igneous rocks.