米易海塔地区混合岩型铀矿微量元素特征

Trace Element Geochemistry of Chorismite Type Uranium Ore in Haita, Miyi, Sichuan

通过研究海塔地区混合岩型铀矿各类岩矿石的微量元素、稀土元素地球化学特征表明,区内矿化长英质脉体和晚期沿韧脆性剪切带充填的长英质脉体微量元素与稀土元素特征相似,说明其成因一致。区内印支期花岗岩、五马箐组片岩、片麻岩以及混合岩化长英质脉体在微量元素与稀土元素特征上有一定相似性,反映由片岩进一步衍生形成的花岗岩、片麻岩以及混合岩化长英质脉体对其原岩的成分具有明显的继承性。综合研究表明,混合岩化作用不是海塔地区混合岩型铀矿形成的主要机制,铀成矿主要与后期的构造热液活动有关。

Geochemical characteristics of trace element and the REE for various rocks and minerals from the chorismite uranium ore in Haita, Miyi, Sichuan indicate that trace elements and REE of mineralized felsic veins are similar to those of felsic veins filling the in later ductile-brittle shear zone in the region. Indo-Chinese granite, schist and gneiss of the Wumaqing Formation, migmatization felsic veins are similar in trace elements and REE geochemistry which shows the uranium mineralization was related to structure and hydrothermal activity other than migmatization.