焦家金矿田构造蚀变岩填图及其地球化学特征分析  

Tectonic-alteration mapping and geochemical characteristic analysis of Jiaojia orefield

作　　者：范潇 吕古贤[2] 王宗永[3] 邵鹤森 杨美汪 房长云 

机构地区：[1]内蒙古地质工程有限责任公司,内蒙古呼和浩特010010 [2]中国地质科学院地质力学研究所,北京100081 [3]中国地质大学(北京),北京100083

出　　处：《地学前缘》2015年第4期46-52,共7页Earth Science Frontiers

基　　金：国家自然科学基金项目(40972061);山东省国土资源厅项目(鲁地调合[2012]33号)

摘　　要：以蚀变岩作为重要填图图例,首次完成了焦家金矿田构造岩相成矿图(1∶5万)。通过区域填图结合大量的巷道剖面实测,厘定了硅化蚀变带、黄铁绢英岩化蚀变带、强钾化蚀变带和弱钾化蚀变带的分带特征。对两类金矿蚀变带的地球化学特征分析发现,绢英岩化蚀变阶段是矿化元素富集的主要阶段。通过岩石矿物计算方法建立了蚀变带主要成岩矿物的交代剖面,结果显示蚀变岩型金矿主要发生硅化和钾长石化,而石英脉型金矿的形成主要伴随硅化和去钙化作用。With the altered-rock as an important legend, we completed the tectonic-alteration map of Jiaojia orefield. After lots of measured profiles, we clarified the zoning character of silicified alteration, phyllic alteration, strong-potassic alteration, and weak-potassic alteration. The comparison of different gold deposits shows that the phyllic alteration is the main process of mineralization. By the way of CIPW method, we created the metasomatic profiles of the main diagenetic minerals. The results show that in altered-type gold deposit, silicified alteration and potassic alteration played important roles, but in quartz-type gold deposit, the important processes are silicified alteration and decalcification.

关 键 词：焦家金矿田 构造蚀变岩填图 蚀变分带 地球化学 矿物交代剖面 

分 类 号：P618.51[天文地球—矿床学]