%0 Journal Article
%T 粤北302铀矿床成矿流体与成矿物质来源研究：H、O、Sr、Nd同位素证据
%A 傅丽雯
%A 孙立强
%A 凌洪飞
%A 沈渭洲
%A 李坤
%A 冯尚杰
%J 高校地质学报
%D 2016
%X 粤北地区是中国花岗岩型铀矿最为重要的大型矿集区。位于粤北诸广复式岩体东部的302 铀矿床是一个规模大，埋 藏较深，矿化垂幅较大的花岗岩型铀矿床。矿体呈似脉状、扁豆状或透镜状产于印支期油洞岩体和燕山早期长江岩体的断 裂蚀变带内，矿石矿物以沥青铀矿为主。近年来，研究者们对该矿床的成矿流体与成矿物质来源一直存在争议。文中对该 矿床进行的氢、氧同位素研究表明，成矿流体的δ18OH2O 值为-7.09‰~3.24‰， δDH2O 值为-105‰~-63‰，反映成矿流体主要 由深循环的大气降水通过水-岩相互作用演化形成， δDH2O 值的偏低可能主要由成矿流体的热液沸腾作用和/或大气降水在深 循环过程中与少量有机水（ δDH2O =-90‰~-250‰） 的混合引起。成矿期萤石的εNd(t)值(-11.9~-11.4)和稀土元素分布模式与 赋矿围岩长江岩体十分相似而与油洞岩体区别明显，萤石落在Gd/Yb-Nb/Ta 图解中的长江岩体及其邻近范围内，表明302 矿床的成矿物质主要来源于赋矿围岩长江岩体。</br>The 302 uranium deposit, located at the eastern part of the Zhuguangshan granite composite in northern Guangdong province which is the most important large ore-concentrated area of granite-hosted uranium deposit in China, is a large-scale, deeply buried and largely vertical mineralized granite-hosted uranium deposit. Uranium ore bodies occur mainly as vein type, flat beanpod-like and lens-like, and are hosted within hydrothermally altered fault zones in the Indosinian Youdong granite and the early Yanshanian Changjiang granite. And the dominant uranium-bearing mineral is pitchblende. Despite intensive research over the past few decades, the source of ore-forming fluid and ore-forming material of this uranium deposit remains controversial. The results of hydrogen and oxygen isotopes in this article show that δDH2O and δDH2O values of ore-forming fluids range from -7.09‰ to 3.24‰ and from -105‰ to -63‰ , respectively, indicating that ore-forming fluids were mainly formed by deeply circulating meteoric water which have
%K 同位素&lt
%K /br&gt
%K 成矿流体与成矿物质
%U http://geology.nju.edu.cn/CN/abstract/abstract9748.shtml