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江苏石油勘探开发公司地质研究院与同济大学海洋地质研究所协作,于1985年7月～10月在F测区开展了比例尺为1:10000的地面高精度磁测圈定火成岩体的试验研究工作。在野外使用CSC-3型高精度悬丝式磁力仪和CZM-2型高精度质子磁力仪同时测定地磁场垂直分量和总磁场强度,测网为250×100m,测区面积为100km~2,测量精度为1.4nT(1.4γ)。由此得到的Z_a磁异常平面图,北部为正异常区,异常很不规则,有三个局部异常;南部为负异常区,呈南北向分布,有二个局部异常。为了消除浅部干扰,对磁异常进行-100m、-200m、-500m向上延拓。为了消除区域场的影响,分离出局部磁异常,对实测磁异常向下做了500m、1000m和3000m延拓。下延后的磁异常呈现许多北东向的局部异常。利用切线法,特征点法等反演手段,计算出测区北部的正磁异常,有可能是上端埋深为1200m、宽度分别为100m、150m、230m的三条辉绿岩岩脉所引起,南部负磁异常形态更加复杂,有可能为上端埋深在1100—1300m左右的多层玄武岩所引起。
In collaboration with the Institute of Marine Geology, Tongji University, Jiangsu Petroleum Exploration and Production Company, Institute of Geology, Tongji University conducted a pilot study on the determination of igneous igneous rocks with a 1: 10000 scale on the F-zone from July to October 1985. In the field, CSC-3 high-precision wire-suspended magnetometer and CZM-2 high-precision proton magnetometer were used to measure the vertical component of geomagnetic field and the total magnetic field intensity at the same time. The measuring area was 250 × 100m and the measuring area was 100km ~ 2. Measurement accuracy of 1.4nT (1.4γ). The resulting Z_a magnetic anomaly map shows that the northern part is a positive anomaly and the anomaly is very irregular with three local anomalies. The southern part is a negative anomaly region with a north-south distribution and two local anomalies. In order to eliminate shallow interference, the magnetic anomaly -100m, -200m, -500m upward extension. In order to eliminate the influence of the regional field, local magnetic anomalies were separated and the measured magnetic anomalies were extended downward for 500m, 1000m and 3000m. The delaminated magnetic anomaly presents many northeastward local anomalies. The tangent method and feature point method are used to calculate the positive anomalies in the northern part of the survey area, which may be caused by the three diabase dikes with the upper buried depth of 1200 m and the widths of 100 m, 150 m and 230 m, respectively Negative magnetic anomaly morphology is more complex, it is possible for the upper buried depth of about 1100-1300m caused by the multi-layer basalt.