【摘要】 对海南岛北部玄武岩区岩石—土壤—植物—地下水系统中稀土元素迁移和分布模式的研究表明 ,随土壤的发育 ,REE出现分异 ,LREE逐渐富集 ;Ce由玄武岩中的负异常向土壤中正异常演化。地下水中REE的含量和分布模式主要受岩石风化和成土作用影响。植物虽对REE具有选择吸收作用 ,但REE的生物地球化学循环不活跃更多还原

【Abstract】 The partition of rare earth elements(REE)is great significant to study on geochemistry.The migration characteristics and distribution patterns of REE in rock-soil-plant-groundwater system in the basalt-distributing region of Northern Hainan Island have been dealt with to research on geochemical behavior of REE in process of hypergenesis.The results show that the fraction of REE in soils mainly depends on REE leaching in soil formation process and disparity of chemical properties among REE.With soil development, REE partition, and light rare earth elements (LREE) accumulate while heavy rare earth elements (HREE) lose gradually.Meanwhile the trends of positive Ce-anomaly and negative Eu-anomaly are remarkable with soil development.REE contents and distribution patterns in groundwater are influenced by rock weathering and soil formation, more HREE than LREE inflow into groundwater so that difference in quantity between LREE and HREE in groundwater is not so great as that in soils.Though plant absorbed REE selectively,biogeochemical cycle of REE is not active.更多还原