Geochemical Characteristics and Behaviors of Rare Earth Elements in Process of Vertisol Development  

作　　者：黄成敏 王成善 

机构地区：[1]School of Environmental Sciences & Engineering, Sichuan University, Chengdu 610065, China [2]Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China

出　　处：《Journal of Rare Earths》2004年第4期552-557,共6页稀土学报（英文版）

基　　金：ProjectsupportedbytheNationalNaturalScienceFoundationofChina ( 4 983 10 0 4) ;andPost DoctorFoundationofSichuanProvince

摘　　要：Vertisol developed on argillaceous rocks has its special pedogenic processes and properties, and formed some secondary nodules. In study area, contents of rare earth elements (REE) are significantly different in different sedimentary rocks due to varied contents of clay fraction and clay mineral composition, etc. Under the dry and hot climate, REEs were less differentiated than their parent sedimentary rocks. However, REEs in secondary nodules formed in pedogenic process display their specific behaviors. They are more concentrated in iron concretions, the content of heavy REEs increases relatively, and positive Ce-anomaly appears. But, negative Ce-anomaly was found in calcium concretions, while normal Ce content in parent rocks and vertisol.Vertisol developed on argillaceous rocks has its special pedogenic processes and properties, and formed some secondary nodules. In study area, contents of rare earth elements (REE) are significantly different in different sedimentary rocks due to varied contents of clay fraction and clay mineral composition, etc. Under the dry and hot climate, REEs were less differentiated than their parent sedimentary rocks. However, REEs in secondary nodules formed in pedogenic process display their specific behaviors. They are more concentrated in iron concretions, the content of heavy REEs increases relatively, and positive Ce-anomaly appears. But, negative Ce-anomaly was found in calcium concretions, while normal Ce content in parent rocks and vertisol.

关 键 词：CERIUM Clay ECOLOGY Geochemistry Rare earth elements Sedimentary rocks WEATHERING 

分 类 号：P595[天文地球—地球化学]