胶东地区新城金矿床地质特征及控矿因素研究

The Geological Characteristics and Ore-controlling Factors of Xincheng Gold Deposit in Jiaodong Area

本文研究表明:矿体呈层状、似层状产出,矿体位于焦家—新城断裂破碎带下盘,展布特征与断裂面特征基本一致,且在走向上与倾向上具有分枝复合、膨大狭缩特征;矿床围岩蚀变发育,从矿体中心部位向两侧围岩具有“黄铁绢英岩化碎裂岩带→黄铁绢英岩化花岗闪长质碎裂岩带→绢英岩化花岗闪长岩带→花岗闪长岩带”的规律;矿体的形成与郭家岭型花岗闪长岩具有良好的时空耦合关系,焦家—新城断裂带是主要的导矿构造和控矿构造。

The study shows that the ore body is layered,and the ore body is located in the footwall of the Jiaojia-Xincheng fault zone.The distribution characteristics of the ore body are basically the same as the characteristics of the fracture surface,and the ore body has branching compound,expanding and narrowing characteristics in strike and dip.The alteration and development of the surrounding rock of the deposit,from the center of the ore body to the surrounding rock on both sides,has the law of"pyrite sericite cataclastic belt→pyrite sericite granodiorite cataclastic belt→sericite sericite granodiorite belt".The formation of the orebody has a good space-time coupling relationship with the Guojialing type granodiorite,and the Jiaojia-Xincheng fault zone is the main ore-guiding structure and ore-controlling structure.