层次分析法在冀北地区多金属矿找矿预测中的应用

Application of analytic hierarchy process method to ore-prospecting prognosis in northern Hebei

冀北地区大地构造单元包括华北陆块、天山-兴蒙造山系及中国东部造山-裂谷系,区内太古代变质岩广泛分布,海西期及燕山期岩浆侵入、喷发活动频繁,围岩蚀变发育,是寻找多金属矿产的有利区域。在分析遥感地质解译要素、蚀变遥感异常与矿化关系的基础上,以中分遥感解译的线、环及蚀变遥感异常、侵入岩、赋矿地层及矿产分布信息为判断因子,运用层次分析法建立找矿预测模型,圈出找矿靶区29个,其中3个找矿靶区内已发现5处大型-特大型矿床,6个找矿靶区内发现12处中型矿床。结果表明,在冀北地区运用层次分析法进行多金属矿找矿预测及找矿靶区圈定,具有较好的实用性。

North Hebei geotectonic unit includes North China craton, Tianshan - Xingmeng orogenic system and China＇s eastern orogenic mountains-rift system. Archean metamorphic rocks are widely distributed, the magmatic intrusion-eruption activities of Hercynian and Yanshanian period are frequent and, what is more, wallrock alterations are widely spread in this area; therefore, polymetallic deposits are likely to be found in this area. According to the relationship between the remote sensing geological interpretation factors, alteration remote sensing anomalies and the mineralization, the author selected the linear and ringed structures in medium space resolution remote sensing images and alteration remote sensing anomalies, intrusive rocks, ore formation and mineral distribution information as judgment factors, and established the prospecting prognositic models by AHP （Analysis Hierarchical Process）. As a result, 29 prospecting target areas were delineated, 5 superlarge ore deposits were found in 3 prospecting target areas, and 12 medium-sized ore deposits were found in 6 prospecting target areas. The results indicate that polymetallic ore prospecting prediction and delineation of prospecting targets can achieve good effect by AHP in northern Hebei area.