摘要
广西摩天岭北缘高芒地区近年发现多处铀矿化,其分布与围岩蚀变类型及强度具有一定的联系。利用质量平衡计算方法对该地区的新鲜花岗岩、蚀变岩石和矿化岩石的主量、微量元素进行分析,探讨各蚀变带的元素地球化学特征和迁移规律。结果表明,高芒铀矿点成矿物质主要来源于赋矿围岩摩天岭花岗岩体,硅化作用贯穿了整个热液蚀变过程,矿化类型为硅质脉-沥青铀矿型。Eu在矿化中心带大量迁入,说明成矿流体性质相对偏氧化,为U的萃取和富集提供了有利条件。绿泥石化、赤铁矿化和黄铁矿化蚀变促进了成矿元素的聚集。微量元素Li、Be、Cu、Mo、Cs的迁移规律与U相似,暗示它们与U成矿关系密切,可以作为在高芒地区寻找铀矿化的指示标志。本研究为今后在摩天岭地区的铀矿找矿勘查工作提供了一定的依据。
In recent years,multiple uranium mineralizations have been discovered in the Gaomang area on the northern margin of Motianling,Guangxi,the distribution of which has a certain connection with the types and intensities of surrounding rock alterations.The major and trace elements of fresh granite,altered rocks and mineralized rocks in this area were analyzed by using the mass balance calculation method to explore the geochemical characteristics and migration laws of elements in each alteration zone.The results show that the metallogenic materials of the Gaomang uranium deposit mainly originate from the Motianling granite body of the hosting rock.Silicification runs through the entire hydrothermal alteration process,and the mineralization type is siliceous vein-pitchblende type.The large amount of Eu immigration in the mineralization center zone indicates that the nature of the ore-forming fluid is relatively oxidized,providing favorable conditions for the extraction and enrichment of U.The alterations of chloritization,hematitization and pyritization promote the accummulation of metallogenic elements.The migration laws of trace elements such as Li,Be,Cu,Mo and Cs are similar to that of U,suggesting that they are closely related to U mineralization and can be used as indicator signs for the search of uranium mineralization in the Gaomang area.This study provides a certain basis for the future uranium prospecting and exploration in the Motianling area.
作者
叶凡琛
王凯兴
YE Fan-Chen;WANG Kai-Xing(East China University of Technology,Nanchang 330013,Jiangxi,China)
出处
《华南地质》
CAS
2024年第4期655-670,共16页
South China Geology
基金
中国铀业有限公司-东华理工大学核资源与环境国家重点实验室联合创新基金项目(2023NRE-LH-01)
中国核工业地质局高校科研攻关项目(201619)
东华理工大学研究生创新专项资金项目(DHYC-202408)。
关键词
铀矿化
热液蚀变
元素迁移
质量平衡
摩天岭
uranium mineralization
hydrothermal alteration
element migration
mass balance
Motianling
