胶东金山金矿床地质特征及构造控矿模式浅析

Primary Study on Geological Characteristics and Structural Orecontrolling Model of Jinshan Gold Deposit in Jiaodong Area

摘要:

金山金矿位于胶东栖霞蓬莱金成矿带中，属于热液交代蚀变岩型金矿床，严格受小庄金山大庄头韧性剪切带控制。该文在介绍研究区成矿地质特征的基础上，将该矿床的构造成矿作用期次划分为3个成矿阶段：成矿前韧性剪切变形阶段、成矿期韧脆性变形阶段和成矿后脆韧性变形阶段，每个阶段对矿脉的形成和分布起着不同的控制作用。其中，在主成矿期左形张剪构造应力场作用下，在断裂带不同部位分别形成不同类型矿脉(体)，这种构造控矿模式是胶东地区中生代伸展构造背景的反映。

Abstract:

Jinshan gold deposit locates in QixiaPenglai gold ore belt of Jiaodong Peninsula. It belongs to typical altered rock type in the fracture zone(Jiaojia type gold deposit) and the ore veins are completely controlled by XiaozhuangJinshanDazhuangtou ductile shear fault. On the basis of geological characteristics, the structuremineralization period of this deposit can be divided into three stages: ductileshear deformation stage before the mineralization, ductile brittle deformation stage in mineralization and brittle ductile deformation stage after mineralization. Every stages play different role in controlling the formation and the distribution of gold ore veins. Affected by the structural stress field of left lateral ringent shear in mineralization period, different types of gold veins or ore bodies are formed in different position of the orecontrolling fault. This structural orecontrolling pattern reflects the extensional tectonic setting of Jiaodong Peninsula in Mesozoic period.