胶东金矿区夏甸金矿床矿化分布规律及构造控矿分析

Analysis on Mineralization Distribution Law and Structural Ore Control of Xiadian Gold Deposit in Jiaodong Gold Field

夏甸金矿床是胶西北地区典型的蚀变岩型金矿床,金矿化主要受招平断裂带控制。本文对夏甸金矿床进行了野外地质调查,三维地质建模和构造空间分析,以期从三维空间和勘查数据中厘清矿化分布规律、探明构造控矿作用。研究结果显示,夏甸金矿床矿化主要为蚀变岩型和硫化物脉型,主要受招平断裂带及其次级构造控制,在空间中呈现出不均一分布的特征。夏甸金矿床的矿化侧伏规律,在空间中存在差异性,其中南部为NE侧伏,中段侧伏规律不明显但分支复合特征明显,而北段呈SE侧伏。这种侧伏规律与招平断裂带主裂面在走向方向的转折密切相关。进一步的空间分析显示,夏甸金矿床不同类型的矿体是不同空间范围内构造变形差异的结果。

Xiadian gold deposit is a typical altered rock type gold deposit in the northwest of Jiaozhou area.Gold mineralization is mainly controlled by Zhaoping fault zone.In this paper,field geological survey,three-dimensional geological modeling and structural spatial analysis of Xiadian gold deposit have been carried out in order to clarify the mineralization distribution law and prove the structural ore control role from three-dimensional space and exploration data.It is showed that the mineralization of Xiadian gold deposit is altered rock type and sulfide vein type,which is mainly controlled by Zhaoping fault zone and its secondary structures,and presents the characteristics of uneven distribution in space.There are spatial differences in the regularity of lateral mineralization of Xiadian gold deposit.In the southern part,it is lateral with the trend of NE.In the central part,it is not obvious but has obvious branching and compounding characteristics.In the northern part,it is lateral with the trend of SE.This lateral subduction law is closely related to the turning of main fracture surface of Zhaoping fault zone in the strike direction.It is showed that the altered rock type and sulfide vein type deposits of Xiadian gold deposit occur within the range of 150~250m from the fault plane,respectively,and are closely related to the dip and fluctuation of the fault plane.It is suggested that different types of ore bodies in Xiadian area are actually the result of structural deformation differences in different spatial ranges.Therefore,the ore prospecting should pay attention to the occurrence change of main fracture surface of Zhaoping fault zone.