铜石杂岩体稀土元素地球化学特点

GEOCHEMICAL CHARACTERISTICS OF RARE EARTH

摘要:

铜石杂岩体是由三个阶段多期次岩浆活动形成的中偏碱性火山杂岩体，其稀土元素分析结果经统计表明：该杂岩体稀土元素总量（ΣＲＥＥ）与地壳克拉克值基本一致，ΣＣｅ／ΣＹ（ＬＲＥＥ／ＨＲＥＥ）比值较大，轻稀土相对富集，Ｅｕ具弱亏损，各期次侵入岩的稀土元素分布形式均呈左高右低的平缓弧形，形态基本相似。这些特征反映了该杂岩体三个侵入阶段的岩浆均来源于地壳深部或上地幔的同一岩浆房，且具有强烈分异的特点。

Abstract:

As showed by the statistical analysis of REE in Tongshi complex,the total content of REE(ΣREE)is nearly equal to Clarke value,the value of ΣCe/ΣY is high,and light REE is relatively rich,while Eu is slightly loss.The REE distribution formulities of every stages intrusive are in gentle arc which is high in left and low in right,and their shapes are generally similiar.The characteristics demonstrates that the threestage intrusives which are composed of Tongshi complex are from the same magma source which orig...