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内蒙古温都尔庙地区蛇纹石化橄榄岩地球化学特征及其地质意义
Geochemical Characteristics of the Serpentinized Peridotite in the Wenduermiao Area, Inner Mongolia,China and Their Geological Significance

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梅盛旺 1   汪玉梅 2   杜显锋 3   迟洪兴 3   郭谱 3   张明峰 4   王先彬 4   卓胜广 3 *  
文摘 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。
其他语种文摘 In order to discuss genetic significance of the serpentinized peridotite in the Wenduermiao area,Inner Mongolia, 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,Al_2O_3, TiO_2 contents than those of the primitive mantle,with negative correlations between their MgO contents and respective CaO,Al_2O_3, TiO_2 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 HFSE(U、Pb、Hf) are strongly enriched. These features 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 peridotite 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.
来源 矿物岩石地球化学通报 ,2016,35(2):212-221 【核心库】
DOI 10.3969/j.issn.1007-2802.2016.02.002
关键词 蛇纹石化 ; 地幔橄榄岩 ; 蛇绿岩 ; 温都尔庙
地址

1. 东北大学秦皇岛分校资源与材料学院, 同位素地球化学国家重点实验室, 河北, 秦皇岛, 066000  

2. 大庆油田有限责任公司井下作业分公司, 黑龙江, 大庆, 163453  

3. 东北大学秦皇岛分校资源与材料学院, 河北, 秦皇岛, 066000  

4. 甘肃省油气资源研究重点实验室, 甘肃省油气资源研究重点实验室;;中国科学院油气资源研究重点实验室, 兰州, 730000

语种 中文
文献类型 研究性论文
ISSN 1007-2802
学科 地质学
基金 国家自然科学基金项目
文献收藏号 CSCD:5693847

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引证文献 2 篇

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2 韩江涛 西伯利亚板块与华北克拉通碰撞带地电结构及对深部缝合边界的讨论 地球物理学报,2019,62(3):1159-1171
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