高校地质学报2016，Vol.22Issue(1)：43-52,10.DOI:10.16108/j.issn1006-7493.2015059
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
Study on the Source of Ore-forming Fluid and Ore-forming Material of the 302 Uranium Deposit in Northern Guangdong Province: Evidence from H-O-Sr-Nd Isotope Geochemistry
摘要
Abstract
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 experienced water-rock interaction. The relatively low δDH2O value may be caused by hydrothermal boiling action of ore-forming fluids or mixing up with small amount of organic water (δOH2O-90‰to-250‰) in the process of deep circulation. TheεNd(t) values (-11.9 to-11.4) and rare earth element distribution patterns of the fluorite of metallogenic period are similar to those of the Changjiang granite but obviously different from those of the Youdong granite. Fluorites are in or near the scope of Changjiang granite in Gd/Yb-Nb/Ta diagram, indicating that uranium source of the 302 deposit was mainly derived from the Changjiang granite.关键词
同位素/成矿流体与成矿物质/302铀矿床/华南Key words
Isotopes/source of ore-forming fluid and ore-forming material/uranium deposit 302/South China分类
天文与地球科学引用本文复制引用
傅丽雯,孙立强,凌洪飞,沈渭洲,李坤,冯尚杰..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[J].高校地质学报,2016,22(1):43-52,10.基金项目
973课题(2012CB416703) （2012CB416703）
中国核工业地质局十二五高校铀矿地质科研项目 （）
