摘要
文章从粤北诸广南部岩体内棉花坑、东坑等典型富铀矿床成矿期黄铁矿Pb同位素及微量元素着手，对富铀矿成矿流体性质及物质来源进行了研究，结果表明：成矿期黄铁矿^206 Pb／^204 Pb为20.02～60.88，^207 Pb／^204 Pb为15.80～17.70，显示成矿流体具有放射性成因铅富集的特点，成矿物质来源于富铀岩体；同时，黄铁矿中异常富集 U、Pb等元素，∑ REE含量低，富集 HREE及部分LREE ，亏损La、Nd；高场强及过渡族元素变化较大， Zr／Hf、Nb／Ta、Y／Ho、 Hf／Sm等比值显示两矿床的成矿流体具有不同性质，且均受到不同来源热液体系的混染。
High grade granite type uranium deposits has been found in north Guangdong. Pb isotope and trace elements of pyrite in Mianhuakeng and Dongkeng deposit were studied as the cases.Ratio of ^206Pb/^204Pb of pyrite in the deposits was 20.02 ～ 60.88 and ^207Pb/^204 Pb was 15.80 ～ 17.70 ,which indicate that ore forming fluid is with radioactive Pb and originated from uranium rich granite. The py‐rite was abnormally riched in U ＆ Pb ,low in total REE but enrich in HREE and some LREE ,depleted in La ,Nd.Ratio of Zr/Hf ,Nb/Ta ,Y/Ho ,Hf/Sm ,which shows that the two deposits have different kind ore forming fluid and mixed by different source hydrothermal system.
出处
《铀矿地质》
CAS
CSCD
2015年第2期73-80,共8页
Uranium Geology
基金
中国地质调查局"全国铀矿资源调查"项目(编号:1212011220781)
国家科技支撑计划项目(编号:2011BAB04B07)
中国核工业地质局生产中科研项目(编号:201369)等联合资助
关键词
花岗岩
铀矿
PB同位素
微量元素
成矿流体
granite
uranium deposit
Pb- isotope
trace element
ore- forming fluid
