化学风化作用中的稀土元素行为及其影响因素  

REE BEHAVIOR AND INFLUENCE FACTORS DURING CHEMICAL WEATHERING

作　　者：马英军[1] 霍润科[2] 徐志方[1] 张辉[3] 刘丛强[3] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]西安建筑科技大学土木工程学院 [3]中国科学院地球化学研究所,贵州贵阳550002

出　　处：《地球科学进展》2004年第1期87-94,共8页Advances in Earth Science

基　　金：国家自然科学基金项目"喀斯特小流域营养离子循环及酸沉降影响的锶同位素示踪"(编号:40203008);国家攀登计划项目"地质流体作用及其成矿效应研究"(编号:95 预 39);国家自然科学基金项目"阿尔泰3号伟晶岩脉绿柱石通道水氢同位素组成及意义"(编号:49903002)资助.

摘　　要：地表风化作用长期以来一直是地球和环境科学研究的焦点问题。风化作用中微量元素地球化学行为的研究不但有助于对一系列全球性问题的认识和理解,而且有助于许多与人类生存密切相关的环境问题的解决。系统总结了近年来国内外在风化作用中的稀土元素地球化学研究领域的主要内容和最新进展,着重介绍了风化壳中稀土元素的分布特征、Ce异常成因、稀土元素的赋存状态和迁移方式、影响稀土元素分布和循环的主要因素,以及风化作用稀土元素地球化学的主要研究方法。最后,分析指出有机质和微生物作用对稀土行为的影响是未来的重要研究方向。Chemical weathering plays an important role in many aspects of geological and environmental processes and is of great significance in both theoretical study and practical application. Study on geochemical behavior of trace elements during weathering can not only provide significant insight into a lot of worldwide earth science problems, but also shed light on solving some ecological and environmental problems that are closely related to mankind's living. Consequently, more attention is being paid to research on chemical weathering of the Earth crust. The physicochemical processes leading to in situ production of the detrital soil components and the release and mobilization of rare earth elements (REE) during weathering are well-documented. From all these studies, it becomes evident that the REE mobility is mainly controlled by two factors, the climatic weathering conditions and the stability of the primary REE carrying minerals, and both geochemical and microbial factors control the abundance, distribution and form of REE during weathering and soil formation. The study contents and latest progress of REE geochemistry during chemical weathering are summarized in this paper, including aspects of REE distribution features in weathering crusts, formation cause of Ce anomaly, modes of occurrence and migration species of REE, and factors influencing geochemical distribution and migration of REE during chemical weathering. At the same time, the main methods of studying REE behavior during chemical weathering are briefly reviewed. Finally, it is particularly emphasized that the study on the effect of organic matter and microbes on REE behavior is an important study perspective in the future.

关 键 词：稀土元素 化学风化 风化壳 地球化学 

分 类 号：P512.12[天文地球—地质学]