中文摘要：

为探讨内蒙古温都尔庙地区蛇纹石化橄榄岩的成因意义,采用X荧光光谱法和电感耦合等离子体质谱法对具代表性蛇纹石化橄榄岩进行了全岩的主量、微量和稀土元素分析。结果显示,MgO含量高于原始地幔,易熔组分CaO、Al_2O_3、TiO_2等亏损且与MgO呈负相关关系,表明研究区地幔橄榄岩是一套亏损的原始地幔熔融残留体;稀土元素和微量元素配分型式表现出,LREE轻微富集,部分LILE（如Rb）明显亏损,另有一些HFSE（U、Pb、Hf等）强烈富集,暗示可能既与地幔源区相关也与俯冲消减带流体交代或蛇纹石化作用有关。本区地幔橄榄岩源于尖晶石相地幔源区,根据Melcher建立的部分熔融模型,判断出岩石部分熔融程度为5%~20%,接近深海地幔橄榄岩（10%~22%）。上述这些特征暗示地幔橄榄岩可能经历了洋中脊型（MOR）和俯冲带型（SSZ）两个阶段的构造演化。

英文摘要：

In order to discuss genetic significance of the serpentinized peridotite in the Wenduermiao area, Inner Mongo- lia, China, many representative serpentinized peridotite samples have been selected to analyze their major, trace, and REE elements by using XRF and ICP-MS methids. Results show that serpentinized peridotites have higher MgO but lower CaO, Al2O3, TiO2 contents than those of the primitive mantle, with negative correlations between their MgO contents and respective CaO, Al2O3, TiO2 contents. This implies that the peridotite in the Wenduermiao area could be the residue of partial melting of the depleted primary mantle. Their REE and trace elements distribution patterns show that LREE are slightly enriched, some LILE （Rb） are obviously depleted, while some H FSE （U,Pb,Hf） are strongly enriched. These fea- tures imply that they could be related not only to the mantle source, but alsoto the metasomatism of the subduction zone fluid or the serpentinization of the peridotite. Additionally, the mantle peridotite was derived from the partial melting of a spinel phase mantle. Based on the partial melting model established by Melcher, it is suggested that the Wenduermiao per- idotite was originated by partial melting of 5% -20% of the spinel phase mantle, similar to those of the abysmal sea mantle peridotite. All above features imply that the peridotite of the Wenduermiao ophiolite could be formed in a MOR setting and then modified by fluids in a SSZ setting.