土壤发育过程中稀土元素的地球化学指示意义

Geochemical Implication of Rare Earth Elements in Process of Soil Development

研究了海南岛北部不同时期喷发的玄武岩上发育土壤中稀土元素的地球化学特征和行为 ,探讨成土过程中稀土元素的分异及其对土壤发育程度的指示作用。REE总量与成土年龄呈显著正相关 ,是指示土壤发育程度的良好指标。同时 ,随土壤发育程度的加深 ,REE出现分异 ,土壤中轻稀土逐渐富集 ,重稀土亏损。伴随着土壤的进一步发育 ,Ce逐渐向正异常而Eu向负异常方向演化。

The geochemical characteristics and behavior of rare earth elements(REE) in soils developed on the basalts in the northern part of Hainan Island erupted in different time were studied as well as the REE partition in the soil formation process and its implication on soil development degree. The results show that the total REE content in soils is correlative with soil age significantly and can be selected as the index to show soil evolution. With the soil developing intensively, LRE gains and HRE loses. The trends of positive Ce anomaly and negative Eu anomaly are remarkable with soil development.