基于GIS的证据权法在铁力-二股地区铅锌多金属矿床预测中的应用

铁力-二股地区地处伊春-延寿成矿带,是铅锌多金属矿床的重要产地,但近年来面临着找矿难度加大等问题。应用地物化遥等资料进行综合信息成矿预测是目前找矿工作的一个重要手段。以地质理论为指导,基于GIS平台,在研究区地质、地球化学、地球物理以及遥感地质等致矿信息提取的基础上,定量分析各个致矿信息(控矿因素)与矿产的空间分布关系,并利用航磁资料对隐伏断裂构造进行推断和解释;建立铅锌找矿概念模型,从而选择最佳控矿因素作为证据因子。在此基础上基于证据权模型进行多元信息成矿预测,圈定找矿靶区。结果显示所圈靶区总体受北东向、北西向及近南北向构造控制,与下寒武统和二叠系地层也存在较为密切的空间关系,覆盖了已知铅锌矿床的90%以上,表明预测结果的可靠性;在伊春市八林场中部、二股营林所东北部、二股营林所南部等地区存在较大的找矿潜力。本文的研究对铁力-二股地区铅锌多金属矿的找矿勘查工作具有重要的参考意义。

Application of the evidence-weight method based on GIS to the prediction of the lead-zinc polymetallic deposit in the Tieli-Ergu area

Located in the Yichun-Yanshou mineralization zone, the Tieli-Ergu area has been an important lead-zinc deposit. In recent years, it faces increasing difficulties in ore search. To deal with this challenge,this work employs multiple data to perform mineralization prediction, including geology, geochemistry, geophysics and remote sensing based on GIS. We analyze the spatial distribution relationship between each ore-controlling factor and mineral resources and predict the metallogenic prognosis in the study area using the evidence-weight method. Totally 12 ore prospecting targets are delineated. Largely they are controlled by NE, NW, and nearly NS trending structures, covering over 90% of the known metal resources, indicative of reliability of the prediction. We infer some places should have major potential of ore search, which will be important for further prospecting in the study area.