鲁西归来庄金矿床三维地质建模及深部成矿预测

3D Geological Modeling Technology and Deep Metallogenic Prediction of Guilaizhuang Gold Deposit in Western Shandong Province

归来庄金矿床为隐爆角砾岩型金矿,是鲁西地区已探明金储量最多的金矿床。由于其产出形态变化多样,利用传统方法进行深部找矿难度较大,近年来三维地质建模技术在成矿预测方面应用较广,为该矿区深部找矿预测提供了新方向。利用三维地质建模平台Micromine中的三维建模技术及地质统计学等方法,基于收集测试得到的相关钻孔数据和采样点品位、成矿元素等数据,构建了归来庄金矿区三维地质模型,包括断裂构造模型、矿体模型及地层—岩体模型等,并采用距离幂次反比法建立了原生晕地球化学三维模型。根据三维空间上断裂延伸规律,结合原生晕地球化学三维空间分析,认为归来庄矿区深部仍有较好的成矿前景,且圈定了深部找矿靶区。经钻探验证扩大了主矿体规模,在深部新发现并评价了“磨坊沟式”金矿体,取得良好的找矿效果,证实找矿靶区预测结果较为可靠,进一步拓宽了该区深部找矿方向。

The Guilaizhuang Gold Deposit is a cryptoexplosive breccia type gold deposit with the largest proven gold reserves in Western Shandong Province.Due to the various occurrence forms,it is difficult to find deep deposits by traditional prospecting methods.In recent years,three-dimensional geological modeling technology has been widely used in mineralization prediction,providing a new direction for deep prospecting prediction in Guilaizhuang mining area.Based on driling geological data,grade of the sampling site and metallogenic elements,the 3D structual,orebody and stratum-rock mass models of the Guilaizhuang Au deposit were constructed by using 3D geological modeling and geostatistical analysis in Micromine platform,and the three-dimensional primary halo geochemical modle was constructed with inverse distance weighted method.According to the law of fault extension in three-dimensional space,combined with the three-dimensional analysis of primary halo geochemistry,it is proposed that the deep part of Guilaizhuang mining area still has good metallogenic prospects,and the deep prospecting target area was delineated.After verifying with drilling,the scale of the main orebody has been expanded,and the“Mofanggou-type”gold orebody has been discovered and evaluated in the deep.Good prospecting results have been obtained.It has been confirmed that the prospecting target area prediction is relatively reliable,and the prospecting direction of the deep area has been further broadened.