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| 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 |
| 杨伟,伊海生,杜秋定,夏国清,达雪娟 |
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(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) |
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| 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。 |
| 关键词: 滇东南 法郎组 锰矿 稀土元素 铀 钍 |
| DOI： |
| 附件 |
| 投稿时间：2010-11-04修订日期：2011-02-08 |
| 基金项目:“十一五”国家科技支撑项目(编号:2006BAB01A12-5)资助 |
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| REE and trace elements U and Th from the manganese-bearing rock series in the Middle Triassic Falang Formation in southeastern Yunnan |
| YANG Wei, YI Hai-sheng, DU Qiu-ding, XIA Guo-qing, DA Xue-juan |
(1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China;
2. No. 282 Geological Party, Sichuan Bureau of Geology for Nuclear Industry, Deyang 618000, Sichuan, China;
3. Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, Sichuan, China) |
| Abstract: |
| 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. |
| Key words: southeastern Yunnan Falang Formation manganese deposit REE U Th |