选择法在红旗岭矿区重力G_8异常评价中的应用

Application of choice method in appraising gravity anomaly G_8 in Hongqiling Nickel Deposit

为评价引起红旗岭矿区G8重力异常的原因,采用解重力勘探反演问题的选择法对其进行重新解释评价。根据剩余重力异常,结合异常地段及其外围地质、地球物理条件建立正演计算模型,进行正演计算并与实测重力异常曲线进行拟合。结果表明G8重力异常并非是由镁铁-超镁铁岩体引起,而是由地层密度局部增大及重力高背景场的局部重力低G11的衬托效应引起。

In order to interpret the reason of gravity anomaly G8 in Hongqiling orefield, the authors useo the choice method which is an inversed method for inversing gravity exploration. Based on the residual gravity anomaly,combined with the surrounding geological and geophysical features, the normal deduction model is established. Forward solution can be conduced by successive fit with the real gravity anomaly curves. It indicats that gravity anomaly G8 is not induced by mafic-ultromafic rocks but by partial increasement of stratigraplnc density and the blending effect gravity anomaly G11 is lower in the whole comparatively high gravity background field.