磁法勘探在新疆尉犁县且干布拉克蛭石、磷灰石矿床普查评价中的应用效果

尉犁县且干布拉克蛭石矿为特大型,磷灰石矿为大型.蛭石、磷灰石均赋存于磁性较强的透辉石岩及超基性岩中,矿体与围岩间有较明显的磁性差异,含矿母岩70%被第四系覆盖.利用地面磁测,较好地圈定了含矿母岩的边界,提供了含矿体的平面形态及产状,为勘查缩小了靶区.磁法勘探不仅是直接找磁铁矿床及某些有关金属矿床的有效方法,而且在间接寻找非金属矿床上亦能发挥作用.

THE EFFECT OF MAGNETIC PROSPECTING APPLIED TO EVALUATION OF QIEGANBULAK VERMICULITE, APATITE DEPOSIT RECONNAISSANCE OF YULI, XINJIANG

Qieganbulak vermiculate deposit has been demonstrated to be an enormous de-posit and apatite deposit to be a large deposit.Vermiculite and apatite exist in di-opside and ultrabasic rocks with stronger magnetism than that of country rocks.70 percent of mother rock is covered by Quaternary. On taking advantage of ground measurement of magnetic properties, the borders of mother rock have been successfully delineated, horizontal shape and attitude of ore-bearing body have been recognized, the defined sizes of the deposits are expanded. All this narrows the target area for detail prospecting of mineral resources reduces geological engineer-ing work,so investment expensese of exploration is saved and the period of exploration is cut down. The achievements proves that not only magnetite deposit as well as some metallic mineral deposits directly, but also can play its role in fin-ding some nonmetallic mineral deposits may be indirectly recognized by magnetic prospecting when the conditions are favourite.