岩石矿物学杂志2011，Vol.30Issue(1)：71-82,12.
粤北302铀矿床围岩蚀变的地球化学特征和成因研究
Geochemical characteristics and causes of wall rock alteration in the No.302 uranium deposit, northern Guangdong
摘要
Abstract
With the drill hole ZK23-2 as the object and the microscopic slice identification and the geochemical analysis of fluid inclusions of the ore-forming period as the main means, this paper mainly studied wall rock alteration of the No.302 uranium deposit.The results show that the ore deposit has a variety of alterations, which are composed of such types as alkali feldspathization, silicification, sericitization, hematitization, chloritization, epidotization, carbonation, and kaolinitization.The ore deposit shows obvious vertical and horizontal zoning.From the top to the bottom of the ZK23-2 drill hole, four alteration zones were recognized, i.e., red-sericitization zone→intense silicification red alteration-sericitization zone (uranium enrichment zone)→chloritization-sericitization zone→weak alteration or normal granite zone.Major elements, trace elements and rare elements in the rock show regular variations.The altered rock has preserved the same geochemical characteristics as the ore-hosting Changjiang rock body, as can be seen from the consistency of their distribution patterns of trace elements and rare elements.Homogenization temperatures of fluid inclusions in different alteration zones are all below 220℃ , belonging to moderate-low temperature hydrothermal fluids.As for chemical components of fluid inclusions, inert gas N2 appears at all the alteration zones, and gaseous CO2 exists in the strong alteration zone, suggesting that the dissolution, migration and enrichment of uranium were related to gaseous CO2 and occurred in gaseous N2 environment during the formation of the uranium deposit.In addition, a study of fluid inclusions in the ore-forming period shows that characteristics of different wall rock alteration zones might have resulted from the mixture of ore-forming hydrothermal fluids.关键词
粤北302铀矿床/围岩蚀变/地球化学特征/成因/热液混合作用分类
天文与地球科学引用本文复制引用
高翔,沈渭洲,刘莉莉,姚薇,朱捌,黄国龙,李秋英..粤北302铀矿床围岩蚀变的地球化学特征和成因研究[J].岩石矿物学杂志,2011,30(1):71-82,12.基金项目
中国核工业地质局生产中科研项目"花岗岩型三大铀矿田铀矿勘香模式及靶区预测"资助项目 （）
