新疆恰瓦克南超基性岩体剩磁异常研究

Study on abnormal of remanent magnetization in Xinjiang's Wacker south ultrabasic rock

为解译超基性岩体引起的强负磁异常,对异常识别综合采用了柯尼希斯贝格比、磁异常的平面特征、地磁场的短周期微扰、磁异常剖面正演拟合四种方法,结合定向标本的磁参数,分别从定性和定量两个方面对强负磁异常进行了判识,推断强负磁异常是具有剩余磁化场特征的超基性岩体引起。该推断与钻探验证结果一致,避免了盲目实施钻探工程。

For the strong negative magnetic anomaly caused by ultrabasic rock,a combination of four methods including Koenigsberger ratio,the plane characteristics of magnetic anomaly,short period geomagnetic perturbation and magnetic anomaly profile forward has been used.The strong negative magnetic anomaly is identified from two aspects of qualitative and quantitative combining with the magnetic parameters of the samples.Strong negative magnetic anomaly caused by the ultrabasic rock body has the characteristics of residual magnetization field,which is consistent with the drilling results and avoid blind drilling.