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.
出处
《地球化学》
CAS
CSCD
北大核心
1992年第3期213-220,T001,共9页
Geochimica
基金
国家自然科学基金
