摘要
香草坪岩体主要岩性为中粗粒斑状黑云母花岗岩,SHRIMP锆石U-Pb法年龄为211±2Ma,属于印支期岩浆作用产物。岩石地球化学特征研究表明,其A>CNK,微量元素模式图曲线形态总体向右倾,以及轻稀土富集、Eu明显亏损的稀土配分模式曲线特征,与华南S型花岗岩的地球化学特征相似。该岩体高(87Sr/86Sr)i和低εNd(t)的特点,表明其可能是前寒武系中等成熟度的基底岩石经部分熔融形成的。该区基底岩石较高的铀含量,可为香草坪岩体提供充足的铀元素,形成铀元素的初始富集。
Xiangcaoping granite pluton is mainly composed of medium-macro grain porphyritic biotite.The age of signle zircon dated by SHRIMP U-Pb is 211±2 Ma,which suggests that this pluton was formed during Indosinan.The geochemical characteristics is ACNK,trace elements spider chart is slightly oblique to the right,enriched in LREE and bears obvious negative Eu anomaly which is similar to that of the S-type granite in sorth China.High（87Sr/86Sr）i and low εNd（t）suggest that this pluton was derived from partial melting of middle maturity Precambrian basement rock,which was rich in uranium and had supplied enough U element to the formation of Xiangcaoping granite pluton.
出处
《铀矿地质》
CAS
CSCD
2010年第4期215-221,227,共8页
Uranium Geology
关键词
香草坪岩体
地球化学特征
强过铝质花岗岩
壳源
Xiangcaoping granite pluton
geochemical characteristics
strongle peraluminous granite
crust source
