摘要
针对北秦岭丹凤地区产铀花岗岩的区域地层、赋矿围岩、蚀变岩和铀矿石进行稀土元素地球化学研究,结果表明:各类样品具有大体类似的LREE富集及Eu负异常的稀土配分模式,表明它们之间稀土元素特征具有继承性;赋矿黑云母二长花岗岩与区域地层(丹凤岩群变质基性火山岩)稀土元素特征指示,二者均形成于岛弧环境;蚀变花岗岩和铀矿石主要继承了赋矿花岗岩的特征。各类样品Y/Ho值变化范围狭窄,为25.09~33.46,显示它们具有共同的源区。铀矿石具有最高的wB(∑HREE),且与铀矿石的品位存在正相关关系,暗示HREE与铀的迁移具有同步性。
The REE geochemistry of four groups of samples (the regional stratigraphy ,ore‐hosting rocks ,altered rocks ,and uranium ores ) were analyzed by using ICP‐MS method to investigate the genesis of the uranium bearing granite in Danfeng area ,North Qinling .The different groups of samples show significant similarity in LREE‐enriched REE patterns and negative Eu anomalies .This indicates that the ore‐hosting rocks and regional strata were formed in a typical island arc tectonic environment . Besides ,altered rocks and uranium ores inherited abundant REE geochemical characteristics from the ore‐hosting rocks .The rocks and uranium ores with narrow range of Y /Ho ratios between 25 .09 33 .46 were derived from the same source .In addition ,uranium ores are characterized by highest ∑ HREE ,and HREE contents correlate positively with uranium ores grades , which is regarded as a clue to a simultaneous transportation of HREE and U .
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2015年第6期1713-1721,共9页
Journal of Jilin University：Earth Science Edition
基金
中国核工业地质局铀矿地质项目(201351)
中国地质调查局地质调查项目(1212011120567
1212011220375)
