甘肃省玛曲矿集区基于MRAS证据权重法找矿预测

利用MRAS证据权重法,在大水金矿成矿带玛曲矿集区进行找矿预测,经过深部钻探验证,获得显著找矿突破。在成矿地质背景分析和以格尔柯金矿床为代表的典型矿床研究基础上,利用已知矿床的控矿要素与区域地质、物探、化探和遥感等资料进行二次融合,并对融合成果进行空间关联分析,建立玛曲矿集区岩浆期后热液型金矿床找矿模型,提取和构置多源地学信息预测因子。基于MRAS证据权重法,分级评价了岩浆期后热液型金矿床的A级、B级、C级3个级别的预测远景区。圈定出辛曲(Ⅰ-1)、大水金矿田(Ⅰ-2)2处Ⅰ级找矿靶区,辛曲东(Ⅱ-1)、忠曲地区(Ⅱ-2)和格尔柯北(Ⅱ-3)3处Ⅱ级找矿靶区。目前,对其中2处Ⅱ级找矿靶区进行钻探工程验证,发现了1处小型金矿床和2处金矿点。

Metallogenic predictions in Maqu high ore concentration area of Gansu Province based on MRAS evidence weighting method

The MRAS evidence weighting method was used to conduct prospecting prediction in Maqu high ore concentration area of the Dashui Gold Mine ore belt,and after deep drilling verification,significant breakthroughs in ore prospecting were made.Based on the analysis of metallogenic geological background and the study of typical deposits represented by Dashui Gold Mine,the secondary integration of ore-controlling elements of known deposits,regional geology,geophysical prospecting,geochemical exploration and remote sensing was made before the results were analyzed pertaining to their spatial association,the ore-prospecting model of post-magmatic hydrothermal gold deposit in the Maqu high ore concentration area was established,and various kinds of geological information prediction variables were extracted and constructed.Based on the MRAS evidence weighting method,grading evaluation of the prospecting and forecasting areas of A,B and C grade of post-magmatic hydrothermal gold deposits in the study area was conducted.Two gardeⅠprospecting targets were identified:Xinqu Gold Mine(Ⅰ-1)and Dashui Gold Field(Ⅰ-2),as well as three GradeⅡprospecting targets:east of Xinqu(Ⅱ-1),Zhongqu Area(Ⅱ-2)and north of Geerke(Ⅱ-3).At present,drilling tests have been carried out on two Grade II prospecting targets among them,and one small gold deposit and two gold spots have been discovered.