八卦庙金矿化及其围岩蚀变过程的元素迁移  

Elements migration of gold mineralization and wall-rock alteration process in Baguamiao

作　　者：翁海蛟 孔凡乾 韦龙明[1,2] 陆叶 孙宁[1,2] 

机构地区：[1]桂林理工大学广西隐伏金属矿产勘查重点实验室,广西桂林541006 [2]桂林理工大学地球科学学院,广西桂林541006 [3]广西壮族自治区二七二地质队,南宁530031

出　　处：《桂林理工大学学报》2015年第4期721-726,共6页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(40772053);广西矿冶与环境科学实验中心项目

摘　　要：根据水岩反应理论,通过围岩与蚀变岩的对比分析,利用图解法求取惰性元素,对八卦庙金矿千枚岩在矿化蚀变过程中元素的迁移规律进行探讨。研究表明,在金矿化蚀变过程中,不同元素的带入带出程度不同,迁移规律明显:重稀土元素均为带出元素,成矿元素和亲硫元素均为带入,顺层脉旁蚀变岩的Au、Ag带入量明显低于节理脉旁蚀变岩;但Cu、Pb的带入量则相反,表明热液蚀变早期形成的顺层脉主要偏向铜铅锌元素富集,而晚期节理脉主要形成金矿化;Bi元素异常高的带入量,可能暗示八卦庙金矿床成矿与深源物质的带入以及深部岩浆活动有内在联系。According to the water-rock reaction theory,through the comparative analysis of surrounding rocks and altered rocks,and seeking inert element by the graphic method,the elements migration study covers the phyllite process of mineralization and alteration in Baguamiao gold deposit. It is shown that various elements are carried in and out at different degrees in the process of gold mineralization and alteration,The element migration rule is obvious. All heavy rare-earth elements were carried-out ones. The ore forming elements and parent sulfur elements are carried-in ones. The quantity of Au,Ag in the altered rocks beside the bedded veins is lower than that in the altered rocks beside the jointed veins,but the situations of Cu and Pb are on the contrary. It is indicated that copper and lead-zinc elements are mainly concentrated in the early hydrothermal alteration period with the formation of bedded veins. However,the gold mineralization is mainly accompanying with the formation of jointing vein in the later period. It suggests that the mineralization has inherent connection with deep materials and magmatic activity by carried-in Bi of abnormally high content in Baguamiao gold deposit.

关 键 词：元素迁移 围岩蚀变 八卦庙金矿 

分 类 号：P614[天文地球—矿床学]