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| 碳酸盐岩红色风化壳Ce异常特征及形成机理 | |
| 引用本文： | 李艳丽,王世杰,孙承兴,刘秀明.碳酸盐岩红色风化壳Ce异常特征及形成机理[J].矿物岩石,2005,25(4):85-90. |
| 作者姓名： | 李艳丽 王世杰 孙承兴 刘秀明 |
| 作者单位： | 1. 中国科学院地球化学研究所环境地球化学国家重点实验室,贵州,贵阳,550002;中国石化胜利油田有限公司地质科学研究院,山东,东营,257015 2. 中国科学院地球化学研究所环境地球化学国家重点实验室,贵州,贵阳,550002 3. 中国科学院地球化学研究所环境地球化学国家重点实验室,贵州,贵阳,550002;上海交通大学环境科学与工程学院,上海,200240 |
| 基金项目： | 国家自然科学基金（40273015和40371012）;中国科学院地球化学研究所知识创新前沿领域项目（IG-04-01） |
| 摘 要： | Ce在贵州碳酸盐岩红色风化壳剖面上部表现为正异常，在底部稀土超常富集层显示强烈亏损。通过对Ce的质量迁移系数的计算，结合相态分析和水化学分析结果，对碳酸盐岩红色风化壳中“的异常行为进行系统的分析后发现：在剖面上部，Ce^3＋氧化水解，水解产物主要与铁锰氧化物共沉淀，少量的与粘土矿物结合，使得ce保留而相对显示正异常；在剖面底部，Ce负异常一方面来源于对基岩负异常的继承；更重要的是，Ce较其他轻稀土稳定，发生迁移富集的量远远小于La，Nd等轻稀土元素，导致Ce在底部富集时相对于其他轻稀土元素发生强烈亏损。而Ce与HCO3^-络合迁出并不是导致碳酸盐岩红色风化壳中强烈Ce负异常的主要原因。 |
| 关 键 词： | 碳酸盐岩风化壳 REE超常富集层 Ce异常 形成机理 |
| 文章编号： | 1001-6872（2005）04-0085-06 |
| 收稿时间： | 2005-05-11 |
| 修稿时间： | 2005-07-25 |
THE CHARATERISTICS OF Ce ANOMALIES IN WEATHERING CRUSTS OF CARBONATE ROCKS AND ITS FORMATION MECHANISM |
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| LI Yan-li,WANG Shi-jie,SUN Cheng-xing,LIU Xiu-ming.THE CHARATERISTICS OF Ce ANOMALIES IN WEATHERING CRUSTS OF CARBONATE ROCKS AND ITS FORMATION MECHANISM[J].Journal of Mineralogy and Petrology,2005,25(4):85-90. | |
| Authors: | LI Yan-li WANG Shi-jie SUN Cheng-xing LIU Xiu-ming |
| Institution: | 1. The State Key Laboratory of Environmental Geochemistry, Institue of Geochemistry, Chinese Academy of Science,Guiyang 550002,China; 2. Geological Scientific Research Institute of Shengli Oil Field Ltd. Co. , SNOPEC,Dongying 257015,China ; 3. School of Enviromental Science and Engineering, Shanghai ,liao Tong University,Shanghai 200240,China |
| Abstract: | In this paper,Ce geochemical behavior has been studied systematically through REE mass transport coefficient,REE combining states and water chemistry of cave drip waters.In the upper part of weathering profiles,Ce 3+ is oxidized into Ce 4+ and hydrated,then mainly co-precipitated with Fe-Mn oxides and partly adsorbed by clay minerals,showing positive anomalies,whereas at the rock-soil boundary,Ce shows intensively negative anomalies.Two reasons are considered to be responsible for this phenomenon.Firstly,soil samples inherited Ce negative anomalies from the basement carbonate rocks.Secondly,more important reason is that in the weathering process Ce is more stable than the other LREEs and the Ce content in the downward leaching solution is much less than the other LREE contents such as La and Nd,resulting in intensively negative Ce anomalies when LREE are super-enriched at the rock-soil boundary.Consequently,the authors excluded the possibility of Ce migrating downward by the preferential formation of complexes with HCO_3- ligand. |
| Keywords: | weathering crust of carbonate rock super-enriched REE bed Ce anomalies formation mechanism |
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