山东招远界河金矿床断裂构造特征及其控矿规律

Characteristics of the fracture structure and ore-controlling regularities in Jiehe gold deposit,Shandong province

界河金矿床为胶东地区典型的蚀变岩型金矿床,矿床产于望儿山断裂的北段,矿体的产出严格受断裂构造控制。矿区断裂构造主要由F1、F2主断裂及一系列次级断裂组成,矿体主要受F1主断裂控制。主断裂沿走向及倾向均呈现波状起伏的特征,其在主成矿期具有左型走滑的正断层性质。主断裂面凸凹转换部位对成矿最有利,其控制了矿体沿走向呈似等距性分布以及向南西侧伏的规律。次级断裂的类型以及构造岩的类型和破碎程度控制了不同的矿化类型。次级节理裂隙发育的频度控制着裂隙脉型矿化的强弱,形成了在主断裂与次级断裂收敛部位富集成矿的"断夹片式"控矿构造模式。通过断裂构造控矿规律分析推断,在Ⅰ号矿体深部存在一定的找矿前景。

Jiehe gold deposit, a typical altered rock type gold deposit in Jiaodong area, occurs in northern Wang＇ershan fault zone and is strictly controlled by fracture structures. The fracture structure of the deposit consists of the main fractures, F1 and F2, and a sequence of subfractures. The orebody is mainly controlled by F1 fracture. The main fracture surface that is a normal fault of sinistral strike-slip in the main metallogenic stage presents undulation a- long trend and tendency. The transferring sites between concave and convex of the fracture surface are the favorable places where gold orebodies occur, which also has controlled the regularities of the equidistant distribution of gold de- posit along strike and the lateral trending of northeast-southwest. The degrees of mineralization are controlled by the types of secondary faults, the types and fragmentation degrees of the tectonite. The frequency of secondary joint fissure control the mineralization intensity of fissure vein type, and it established a model of broken clamping piece type that the minerals are enriched at the convergence site between the main fracture and the sub. Based on the study of the fault-controlled regularities,it is inferred that there are good prospects of mineral exploration in deep orebody I.