东川矿区1∶5万重力资料地改及地质效果

在某一特定的重力勘探区，用统一的校正密度来作地改是不合理的．作者将新兴的几何学——分形分析理论引入重力勘探领域，把布格异常分形维最小的校正密度作为最佳校正密度．在此基础上，对东川矿区重力数据进行了处理，获得了本区的分区布格校正密度，并对其进行了三角面高精度的地形改正，得到了该区较为可靠的重力异常，使其地质意义更加明确．

HIGH PRECISE GRAVITY TERRAIN CORRECTION AND THE GEOLOGY EFFECTS IN DONGCHUAN ORE OF YUNNAN

In a gravity prospecting area, it is unreasonable to use the same density value in the whole area to calculate Bouger correction value. In this paper, the writer applys a new geometry theory fractal analysis to gravimetric field. According to the minimum fractal dimension of anomaly, we can get the optimum Bouger correction density. Based on the new method, the gravity data in Dongchuan ore have been processed. We get the optimum Bouger correction density in different subregions, and furthermore we use triangular element model to calculate the terrain correction value, so we have got the better gravity anomaly which is less correlate with the terrain. By the new gravity anomaly, the mineralization belts are prognosticated.