安徽沿江地区中生代基性岩稀土元素地球化学特征  

RARE EARTH ELEMENT GEOCHEMISTRY OF MESOZOIC BASIC ROCKS ALONG THE YANGTZE RIVER IN ANHUI

作　　者：徐祥[1] 邢凤鸣 

机构地区：[1]安徽地质调查院,合肥230001

出　　处：《安徽地质》1999年第2期81-89,共9页Geology of Anhui

基　　金：国家科技攻关项目!85-901-03-04

摘　　要：安徽沿江地区中生代基性岩稀土、微量元素模拟表明：该区中生代碱性玄武岩—辉长岩是由石榴石二辉橄榄地幔岩经低度部分熔融形成的产物，并且经历了早期橄榄石、斜方辉石等铁镁矿物的分离结晶作用。其地幔源区受到近期交代富集作用的影响，具有富集LREE、K、P、Th、U等不相容元素的特征。The modelling of rare earth and trace elements of Mesozoic basic rocks along the Yangtze River in Anhui shows that these Mesozoic alkali basalt and gabbro. the primitive melts, are derived from garnet garnet lherzolte source by low - degree parital melting and subjected to early fractional crystallization of mafic minerals of olivine and orthorhombic pyroxene. etc. The mantle source is affected by the recent metasomatic enrichment with the characteristics of the concentration of incompatible trace elements of LREE, K, P, Th. U and so on.

关 键 词：地球化学 稀土元素 成因模拟 中生代基性岩 安徽沿江地区 

分 类 号：P595[天文地球—地球化学]