鄂东南矿集区铜绿山-铜山铜铁金矿床三维地质建模与深部预测

Three-dimensional (3D) geological modeling and deep mineral targeting of the Tonglüshan-Tongshan Cu-Fe-Au deposit in southeastern Hubei Province

铜绿山-铜山是鄂东南地区典型的矽卡岩型铜铁金矿床。针对该矿床深部找矿需求,以科学成矿预测理论为指导,对成矿地质条件及深部找矿潜力进行了综合分析。利用Surpac三维建模软件进行三维可视化研究,构建三维地质体实体模型、三维地球化学模型及三维地球物理模型。对有利的找矿信息进行提取,选择侵入接触面缓冲、蚀变缓冲、F1因子和重磁同源异常4种预测要素,并选用证据权的方法进行综合成矿预测,构建了三维综合信息预测模型,应用该模型圈定了3处找矿靶区,将铜绿山-铜山铜铁金矿床的预测评价研究拓展到三维空间,为周边同类型矿床的深部找矿预测工作提供了参考。

Tonglüshan-Tongshan is a typical skarn Cu-Fe-Au deposit in southeastern Hubei Province. In this study, based on the deep-seated ore-prospecting, and the guidance of scientific deep metallogenic prediction theory, a comprehensive analysis of the metallogenic geological conditions and deep ore prospecting potential has been carried out. A 3 D visualization study based on Surpac 3 D modeling software was carried out. Based on the exploration line profile data and driling geological data, the 3 D geological body solid model of the Tonglüshan-Tongshan Cu-Fe-Au deposit was constructed, including the orebody model, stratum model, skarn model, and intrusion contact surface model. Based on the drilling spectral data, the combination of F1, F2, and F3 factors was constructed by factor analysis, and the 3 D geochemical model was constructed with the inverse distance weighted method. The gravity and magnetic homology anomalies were extracted from the gravity and magnetic data, and the 3 D geophysical model was constructed. Four prediction elements were selected based on favorable prospecting information, including intrusive contact surface buffer, alteration buffer, F1 factor, and gravity and magnetic homology anomalies. The method of evidence weight was applied in comprehensive mineralization prediction to develop a 3 D prospectivity model, and three potential exploration targets were delineated. After verifying with drilling, the scale of the main orebody has been expanded, and good prospecting results have been obtained.The result shows that the research on predicting and evaluating the Tonglüshan-Tongshan deposit has been extended to 3 D space. It is anticipated that the results could provide a reference for deep mineral targeting of the deposits in the peripheral areas with the same type.