辽东沉积变质型铁矿找矿预测研究

Study on prospecting prediction of sedimentary metamorphic iron deposit in Liaodong

辽东为华北地台5个重点成矿区之一,铁矿资源丰富,铁矿主要成因类型为沉积变质型。在对区域地质环境、成矿作用、矿床形成以及后期改造作用分析的基础上,探讨了辽东沉积变质型铁矿的成矿模式。在成矿模式指导下筛选出地质、化探、物探等多元找矿信息,建立适合本区域资源预测的找矿模型。依据已建立的辽东区域找矿模型,采用证据权重法对辽东地区进行铁矿资源预测与评价,根据预测的后验概率值圈定一级成矿远景区3个,二级成矿远景区5个。预测结果表明,辽东地区具有较大的找矿潜力,该矿产资源预测方法有效性较好。

Liaodong area was one of the five important metallogenic areas in north China platform, where there were rich iron ore re- sources and large prospecting potential. The main genetic types of iron ore was sedimentary metamorphic type. The authors discussed the metallogenic model of iron ore in Liaodong area on the basis of analyzing regional geological environment, mineralization and the process of formation and later reconstruction of sedimentary metamorphic iron deposits. Secondly the authors built the mineral resources prospecting model which was suitable for the iron ore prediction through extracting the geological, geochemical, geophysical information under the guidance of metallogenic model. According to the established prospecting model of the study area, by using the evidence weights method to predict and evaluate the iron ore resources deposit in the area. Finally the authors analyzed the values of posterior probability and delineated metallogenic prospects, they contained three level one metallogenic prospects and five level two metallogenic prospects. The predicted results showed that eastern Liaoning area was of a good potential for prospecting minerals and the ore predic- tion method was very effective.