海南抱板地区中元古代花岗岩副矿物锆石的特征及U-Pb同位素年龄测定  

CHARACTERISTICS AND U-Pb ISOTOPIC AGES OF ZIRCONS IN THE MIDDLE PROTEROZOIC GRANITOIDS FROM BAOBAN AREA, HAINAN PROVINCE

作　　者：俞受鋆[1] 夏萍[1] 邓铁殷 李强 陈毓蔚[2] 

机构地区：[1]中山大学地质系,广州510275 [2]中国科学院地球化学研究所广州分部,广州510640

出　　处：《地球化学》1992年第3期213-220,T001,共9页Geochimica

基　　金：国家自然科学基金

摘　　要：海南抱板地区中元古代花岗岩体中各种类型锆石的晶体形态、化学成分、U-Pb同位素组成等特征具有典型的岩浆型锆石的特点,不同于沉积锆石及再生锆石。锆石结晶年龄为1440.87Ma左右,属中元古代。前人所谓的抱板混合岩,主体实质上是中元古代的花岗岩。The crystal form, chemical composition and U-Pb isotopic composition of various zircon fractions in the Middle Proterozoic granitoids from the Baoban area suggest that the zircons are typically magmatogenic in nature, and differe nt from those sedimentary and epigenetic zircons. The various zircon fractions yield an age of about 1440.87Ma, which may represent the age of zircon crystallization. The so-called Baoban Group migmatite is, as a matter of fact, a Middle Proterozoic granitoid body.

关 键 词：花岗岩 矿物 锆石 同位素 年龄 

分 类 号：P588.121[天文地球—岩石学]