胶东招平断裂带围岩蚀变地球化学特征

招平断裂带是胶东地区重要的金成矿带, 众多蚀变型、石英脉型金矿床产出于该带及下盘次级断裂中。以招平断裂带破头青断裂为研究对象, 进行剖面测量和取样测试分析, 探讨围岩蚀变地球化学特征。研究结果显示, 招平断裂带破头青断裂蚀变分带明显, 不同蚀变强度的蚀变岩中常量元素迁移规律明显, REE配分曲线表现为HREE富集, Eu、Ce均有较明显的负异常, 从弱蚀变至强蚀变过程中, ΣREE、LREE和HREE均有明显降低, 且相应特征值表现出规律的变化, Au-Ag-Bi-Co-Cu-Mo-Ni-Pb-Zn是金成矿密切相关的指示元素组合。 

THE WALL ROCK ALTERATION AND ITS GEOCHEMICAL CHARACTERISTICS OF ZHAOPING FAULT ZONE IN JIAODONG

Zhao-Ping fault belt is an important gold metallogenic belt in Jiaodong area, and lots of altered-rock-types and quartz-vein-type gold deposits output in the belt and secondary faults of the footwall. To explore the geochemical features of the wall rock alteration, the Potouqing fault in Zhao-ping fault belt is taken as the research object, with the profile measuring and sample analyzing. It's showed that the alteration zones of the Potouqing fault are evident in Zhaoping fault belt. With the different alteration intensities in altered rock, the major elements' migration regularity is obvious. The enrichment of HREE is showed in the REE distribution curve. Eu and Ce have obviously negative anomaly. With the process from weak alteration to strong alteration, theΣREE, LREE and HREE significantly decrease, and the regular changes are showed by the corresponding characteristic value, Au-Ag-Bi-Co-Cu-Mo-Ni-Pb-Zn is the indicator element suite which is closely related to the gold mineralization.