基于GIS证据权重法的祁连山地区铜矿床成矿预测

在成矿地质规律研究基础上，将祁连山地区划分9432个统计单元，对其中的192个铜矿床进行多源地质信息（包括地层、岩体、断裂信息）的提取。认为祁连山地区铜矿有利成矿地层组合为下古生界砂岩；与成矿有关的岩体为基性一超基性岩，代表了不同的铜矿床类型；断裂发育有利于成矿，其中80％的矿床集中在距离断裂2．59km的范围之内，断裂的密集程度与含矿性呈正相关。利用证据权重法，对研究区铜矿各成矿因素按照权重提取12个证据层，进行全区铜矿床成矿预测。

APPLICATION OF WEIGHT EVIDENCE METHOD FOR MINERAL POTENTIAL ASSESSMENT BASED ON GIS:A CASE STUDY ON PREDICTION OF COPPER DEPOSITS IN QILIAN MOUNTAIN AREA

Based on full understanding of characters of geological setting and mineralization regulation, the Qilian mountain research area has been divided into 9432 units with 10 km× 10 km for each unit,we extract multi-source information （including strata,magma,fault） of 192 copper deposits in Qilian mountain area. We have come to the following conclusions：sandstone of Lower Paleozoie group is host rock of copper ore;basic-ultrabasic intrsives are related to copper mineralization; the sandstone and the intrusives represent different copper deposit type; fault is favorable for the ore-forming process, 80% of the copper deposits occur within distance of 2.39km from the fault and fault density is positively correlated to copper deposit occurrences. Using the weight evidence method we extract 12 evidence layers for ore prediction.