滇东南中三叠统法郎组含锰岩系稀土元素和铀、钍元素的特征及意义  

REE and trace elements U and Th from the manganese-bearing rock series in the Middle Triassic Falang Formation in southeastern Yunnan

作　　者：杨伟[1,2] 伊海生[1] 杜秋定[3] 夏国清[1] 达雪娟[1] 

机构地区：[1]成都理工大学沉积地质研究院,四川成都610059 [2]四川省核工业地质局二八二大队,四川德阳618000 [3]成都地质矿产研究所,四川成都610081

出　　处：《沉积与特提斯地质》2011年第4期104-110,共7页Sedimentary Geology and Tethyan Geology

基　　金："十一五"国家科技支撑项目(编号:2006BAB01A12-5)资助

摘　　要：对滇东南中三叠统法郎组含锰岩系进行了系统采样,用ICP-MS法分析了17件锰矿样品和两件含锰灰岩样品中的稀土元素组成。研究表明,所有样品REE配分模式皆为富LREE型,锰矿样品表现较弱的Ce(δCe值0.79～1.29)异常和Eu(δEu值0.84～1.20)异常;而含锰灰岩则显示出强烈的负Ce异常和较弱的负Eu异常。并通过logTh-logU图解分析,得出滇东南中三叠统法郎组含锰岩系普遍经受了多期次的热液的作用。The REE compositions are explored by using ICP-MS method for 17 pieces of manganese ore samples and 2 pieces of manganese-bearing limestone samples from the manganese-bearing rock series in the Middle Triassic Falang Formation in southeastern Yunnan.The REE distribution patterns for all these samples display the patterns for the enrichment in LREE.The manganese ore samples are characterized by slight Ce（δCe values ranging from 0.79 to 1.29） and Eu（δEu values ranging from 0.84 to 1.20） anomalies.The manganese-bearing limestone samples are characterized by highly negative Ce anomalies and slightly negative Eu anomalies.It is concluded that the manganese-bearing rock series in the Middle Triassic Falang Formation in southeastern Yunnan are commonly subjected to hydrothermal processes and resulted from polyphase processes.

关 键 词：滇东南 法郎组 锰矿 稀土元素 铀 钍 

分 类 号：P595[天文地球—地球化学]