胶东玲珑金矿区煌斑岩及其蚀变岩地球化学特征  

Geochemistry of lamprophyre and its altered rocks in Linglong gold cluster in Jiaodong peninsular

作　　者：赫银峰 龚庆杰[1] 韩东昱[1] 刘宁强[1] 李淼[1] 马云涛[1] 袁玉涛[1] 

机构地区：[1]中国地质大学(北京)地球科学与资源学院 [2]中国人民武装警察部队黄金第八支队

出　　处：《黄金》2014年第7期13-20,共8页Gold

基　　金：国家自然科学基金重点项目(41230311);国家科技支撑计划课题(2011BAB04B09)

摘　　要：煌斑岩与金矿化在时间、空间和成因方面关系密切。选择胶东玲珑矿区煌斑岩及其蚀变岩开展56项元素地球化学研究,结果发现胶东玲珑金矿区煌斑岩在成分上相当于高钾玄武质粗面安山岩,相对中国基性岩富K2O、Fe2O3、P2O5、轻稀土、Th、U、Pb、Be、Sr、Ba、Li、Rb、F、Cr,贫Na2O、Ti2O、CaO、MnO、重稀土、Nb、Ta、Sc、W、Bi、Zn、Cd、As、Co、V、B。玲珑金矿区蚀变煌斑岩相对新鲜煌斑岩贫Na2O,富MnO、Pb、Zn、As、W、Sb、Cd、Au、Ag,这表明引起煌斑岩蚀变的这期热液流体富含W、Pb、Zn、Cd、Au、Ag、As、Sb等热液成矿元素。花岗岩风化指数WIG可较好地适用于煌斑岩蚀变过程的研究,且较蚀变指数CIA在反映蚀变程度上更灵敏。The lamprophyre rock has a co-occurrence relationship with gold deposits in time, space and genesis. Lamprophyre and its altered rock in Linglong gold cluster in Jiaodong peninsular were investigated and analyzed on 56 geochemical items. The results indicate that lamprophyre in Linglong gold cluster is equivalent to high potassium basaltic andesite in composition. With respect to basic rocks in China, the lamprophyre in Linglong gold cluster is rich in K2O, Fe2O3 , P2O5 ,light REE, Th, U, Pb, Be, Sr, Ba, Li, Rb, F, Cr, and poor in Na2O, TiO2, CaO, MnO, heavy REE, Nb, Ta, Sc, W ,Bi ,Zn, Cd, As, Co, V, B. The altered lamprophyre is poor in Na2 O, and rich in MnO, W, Pb, Zn, Cd, Au, Ag, As and Sb relative to the fresh lamprophyre in this study, which implies that the hydrothermal fluid which re- sulted in the alteration of the lamprophyre must be rich in Pb,Zn,As, W, Sb, Cd, Au and Ag in Linglong gold cluster. The weathering index of granite （WIG） was tested to describe the alteration degree of lamprophyre rocks firstly and the results indicate that the WIG is not only suitable to describe the alteration degree of lamprophyre rocks, but also is more sensitive than the commonly used chemical index of alteration （CIA）.

关 键 词：煌斑岩 蚀变 地球化学特征 玲珑金矿区 胶东 

分 类 号：TD11[矿业工程—矿山地质测量] P618.51[天文地球—矿床学]