贵州织金磷矿区表生作用下稀土地球化学特征

通过对贵州织金磷矿区磷块岩岩石—土壤—植物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,HREE亏损;植物对REE具有选择吸收作用。岩石—土壤—植物中的稀土元素球粒陨石标准化分布模式基本相似,为右倾型,轻稀土富集,重稀土亏损,均显示Ce负异常,Ce由磷块岩中的负异常逐渐向土壤中正异常演化。

REE Geochemistry of Hypergenesis in Posphorite in Zhijin County, Guizhou Province, China

The partition of rare earth elements（REE） is greatly significant to geochemical researches.The characteristics of migration and distribution patterns of REE in rock-soil-plant of phosphorite in Zhijin County,Guizhou Province have been concerned with researches of REE geochemical behaviors in process of hypergenesis.The result shows that the fraction of REE in soil mainly depends on REE leaching in soil formation process and disparity of chemical properties of REE.With the development of soil,REE emerged partition feature that light rare earth elements（LREE） were accumulated,but heavy rare earth elements（HREE） were lost gradually,and plants absorbed REE selectively.All the samples of this profile show negative anomaly.Ce emerged an evolutionary process that from negative anomaly in phosphorite to positive anomaly in soil.