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

发布时间：2018-04-10 20:18

  本文选题：同位素 + 成矿流体与成矿物质　； 参考：《高校地质学报》2016年01期

【摘要】：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δ18O_(H_2O)值为-7.09‰~3.24‰,δD_(H_2O)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,δD_(H_2O)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(δD_(H_2O)=-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。
[Abstract]:Northern Guangdong is the most important large-scale ore-gathering area of granitic uranium deposits in China.Uranium deposit 302, located in the eastern part of the Guang-Guang complex in northern Guangdong, is a granitic uranium deposit with large scale, deep burial and large vertical mineralization.The orebody is vein-like, lentil or lenticular, and occurs in the fault-alteration zone of the Indosinian Youdong rock body and the early Yanshanian Yangtze rock mass. The main ore minerals are asphaltene uranium deposits.In recent years, researchers have been controversial about the ore-forming fluid and ore-forming material source.The hydrogen and oxygen isotopic studies of the deposit show that the 未 18 O _ S _ H _ 2O value of the ore-forming fluid is -7.09 鈥，

本文编号：1732755