【摘要】 在野外地质工作基础上,运用岩石地球化学方法,通过主量元素、稀土元素和微量元素研究,探讨了水洞岭矿区石英角斑岩的岩石化学特征、形成环境及其与成矿的关系。研究表明:石英角斑岩的w（SiO2）=73.11%⁷9.30%,w（K2O）=1.20%⁵.99%,w（Na₂O）=1.57%⁴.61%,w（K₂O+Na₂O）=4.82%⁸.67%,Na₂O/K₂O=0.45³.49,ACNK=0.99¹.25。稀土元素总量w（ΣREE）=70.19×10^-6198.75×10^-6,轻稀土元素富集,重稀土元素亏损,轻重稀土元素分馏明显（（La/Yb）N=3.65⁸.20）,Eu中度至轻度亏损（δEu=0.53⁰.96）;大离子亲石元素（Rb、Ba、Th、U、K）和Pb等元素富集,高场强元素（Nb、Ta、Ti、P）和Sr等元素亏损。综合表明水洞岭矿区石英角斑岩形成环境类似于洋壳俯冲成因的火山弧环境。更多还原

【Abstract】 Based on field geological investigation,we systematically studied major and trace elements of quartz keratophyre in the Shuidongling Orefield,Nanzhao County,Henan Province,in order to constrain its geochemical characteristics,emplacement setting,as well as relationship with mineralization.Analyses show that the quartz keratophyre has SiO₂ contents ranging from 73.11%to 79.30%,K₂O contents from 1.20% to 5.99%,Na₂O contents from 1.57% to 4.61%,K₂O+Na₂O contents from 4.82% to 8.67%,Na₂O/K₂O ratios from 0.45 to 3.49,and ACNK ratios of 0.99 to 1.25.It is enriched in light rare earth elements and depleted in heavy rare earth elements.This exhibits obvious light-heavy rare earth element fractionation（（La/Yb）N=3.65-8.20）and slight-moderate Eu negative anomalies（δEu=0.53-0.96）,with total rare earth elements（ΣREE）contents of 70.19×10^-6 to 198.75×10^-6.The quartz keratophyre is enriched in LILEs（Rb,Ba,Th,U,K etc）and Pb,but depleted in HFSEs（Nb,Ta,Ti,etc）,Sr,and P.Integrated study indicates that the quartz keratophyre is emplaced in an extensional setting,similar to arc-volcanics derived from subduction of oceanic crust.更多还原