晋北吕梁群含石榴石变质岩的地质地球化学特征  

Geological and Geochemical Features of Metamorphic Rocks Containing Garnets in Lliang District Shanxi Province

作　　者：卢保奇[1] 王赐银[2] 翁臻培[1] 

机构地区：[1]上海大学材料科学与工程学院,上海201800 [2]南京大学地球科学系,南京210093

出　　处：《上海大学学报（自然科学版）》2003年第4期313-317,共5页Journal of Shanghai University:Natural Science Edition

基　　金：国家自然科学基金 (493 72 1 0 2 )资助项目

摘　　要：该文系统地研究了山西吕梁群含石榴石变质岩的地质地球化学特征.研究表明该变质岩的原岩为泥、砂质和富铝的粘土质沉积岩,其特点为SiO2>65%;Al2O3平均为14%,且Al2O3>MgO;K2O的含量较高(平均为2.8),且K2O>Na2O,K2O/K2O+Na2O>0.5;CaO<MgO.不同样品的稀土配分曲线较相似,表明稀土元素对中高级变质作用的惰性.稀土元素Ce表现出正异常或基本无异常,表明其形成环境为浅海相、边缘海或被陆地封闭的海相环境.Geological and geochemical features of metamorphic rocks containing garnets in Lliang District Shanxi Province are studied in this paper. The results show that the metamorphic rocks originated from mud rocks are characterized by relatively higher aluminum (Al2O3) and kalium (K2O>Na2O,K2O/K2O+Na2O>0.5), and lower caicium (CaO<MgO). The REE distribution pattern is similar to each other, indicating that REE is inactive in the metamorphism. Distribution of Ce in REE indicates that the sediment of mud rocks was formed in a shallow sea environment or in seawater near land.

关 键 词：含石榴石变质岩 稀土元素 稀土配分模式 形成环境 吕梁群 

分 类 号：P619.28[天文地球—矿床学] P511.5[天文地球—地质学]