胶东玲南-水旺庄巨型金矿床三维地质特征及断裂控矿规律

    Three-dimensional geological characteristics and fracture-controlling laws of Lingnan-Shuiwangzhuang giant gold deposit in Jiaodong

    • 摘要: 胶东玲珑金矿田是著名的玲珑式石英脉型金矿产地,近年深部找矿发现了资源量超过600 t的蚀变岩型巨型金矿床,深入研究金矿床的三维空间特征,有助于指导该区进一步的深部找矿。利用375个钻孔资料建立了玲南-水旺庄巨型金矿床三维地质模型,分析了金矿床的三维空间特征和主要矿体的空间分布规律。矿床由3个主矿体组成,矿体沿招平断裂北段的九曲蒋家断裂和破头青断裂主裂面下盘分布。赋矿断裂沿走向呈舒缓波状,沿倾向由浅到深由陡变缓且呈阶梯状。矿体厚度的三维分布沿走向和倾向均呈现厚—薄相间变化,矿体品位与厚度相关系数为0.192,矿体品位×厚度的三维分布构成了4处矿化富集区。分析表明,断裂表面坡度变化较大区域易于矿体富集,且矿体主要富集在坡度较缓部位。由此认为,断裂倾角变化是金矿化富集的关键因素,深部找矿应注重对断裂倾角变化的研究和探测。

       

      Abstract: The Linglong gold field in Jiaodong Peninsula was well known for numerous quartz vein-type gold deposits.In recent years, a giant altered rock type gold deposit with resources of more than 600 tons was discovered in the deep.Detail study on three-dimensional characteristics of this gold deposit will help guide further deep prospecting in the region.This paper introduces how to establish a three-dimensional geological model of the Lingnan-shuiwangzhuang giant gold deposit using 375 drilling holes.The three-dimensional spatial characteristicsand the spatial distribution law of main orebodies were revealed through the 3D model.There were three main ore bodies, which were distributed along the footwall of the Jiuqu-Jiangjia Fault and the Potouqing Fault in the north section of Zhaoping Fault Systems.The ore-bearing faults are in a gentle wave shape along the striking direction, and dip angle gradually changes to gentle from shallow to deep along thedipping direction.The thickness of ore bodies shows an alternating change of along the striking thickness along the strike and inclination.The correlation coefficient between the grade and thickness of the ore body is 0.192.The three-dimensional distribution of the product of the grade and thickness constitutes four mineralized enrichment areas.The analysis shows that the ore bodies are easy to be enriched in the areas with large slope changes on the fault surface and the areas with gentle slope.It can be seen that the change of fault dip angle is the key factor of gold mineralization enrichment, and the study and exploration of the change of fault dip angle should be paied more attention to in deep prospecting.

       

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