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.
出处
《沉积与特提斯地质》
CAS
CSCD
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
关键词
滇东南
法郎组
锰矿
稀土元素
铀
钍
southeastern Yunnan
Falang Formation
manganese deposit
REE
U
Th
