湖北大冶石头咀矿区磁法正演计算

DIRECT PROBLEM ON MAGNETIC PROSPECTING IN SHITOUZUI ORE AREA,DAYE,HUBEI

我国目前大多数地表浅部矿床(矿体)已被探明、开采,寻找深部隐伏矿体已成为当务之急。本文即利用湖北大冶石头咀矿区磁法正演求剩余异常,来说明正演计算法在寻找隐伏矿体中的可行性。并在计算方法中说明了直立线元法正演计算时,对南北向测线工区计算座标的处理办法。

With most of the surface(shallow) ore deposits(ore bodies) in China being demonstrated and exploited, the future targets will be aimed at the concealed ore bodies at depth. As a very aim, the prospecting for blind ore bodies in Shitouzui ore area, Daye, Hubei is effective in utilizing the calculated results of the direct prob-lem on magnetic prospecting. The curve of the direct problem on magnetic prospect-ing in Shitouzui ore area coincides with the known ore body very well, explaining the success of calculation with vertical line unit method; because of the high degree of exploration in the ore area, the curve of the direct problem(DZ) coincides with the geomagnetic field value curve of the initial observation on surtace(Za) con-siderably; for this, the residual anomaly is not so clear. But, it is fully indicated that this method for calculation is completely feasible, so long as there exists the concealed ore body(related to the magnetics) and the observation of the initial geo-magnetic field value(Za) fits the request in accuracy. It is worthy to propose for the working area with measured line of N-S trending(or approximately N-S trending), the calculation datum(original point) should be set below on the right in the corner of the working area during the calculation by the vertical line unit method and the calculation information DOU, equal to zero(DOU=0) in order to make the direct problem curve of the orebody to be ideal.