| 藏南罗布莎蛇绿岩壳层熔岩地球化学特征及成因 |
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| 引用本文： | 钟立峰,夏斌,崔学军,周国庆,陈根文,韦栋梁.藏南罗布莎蛇绿岩壳层熔岩地球化学特征及成因[J].大地构造与成矿学,2006,30(2):231-240. |
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| 作者姓名： | 钟立峰 夏斌 崔学军 周国庆 陈根文 韦栋梁 |
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| 作者单位： | 1. 中国科学院边缘海地质重点实验室,中国科学院广州地球化学研究所,广东,广州,510640;中国科学院研究生院,北京,100039
2. 中国科学院边缘海地质重点实验室,中国科学院广州地球化学研究所,广东,广州,510640 |
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| 基金项目： | 中国科学院知识创新工程项目(KZCX2-SW-117)，中国科学院边缘海重点实验室开放研究基金项目(MSGL-04-12)资助. |
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| 摘 要： | 罗布莎蛇绿岩是雅鲁藏布江蛇绿岩带东段出露较好,也是研究程度较高的蛇绿岩片之一,对其壳层熔岩研究表明,该熔岩属于亚碱性玄武岩与安山岩/玄武岩之间的过渡类型,富集Rb、K、Ba等大离子亲石元素,高场强元素具有轻微左倾正斜率分布特征,并亏损Nb、Ta,反映出该蛇绿岩受到了俯冲作用的影响,稀土元素显示LREE亏损、HREE平缓的球粒陨石标准化分布模式,体现了该蛇绿岩N-MORB的地球化学特征,结合第一过渡系元素地球化学特征,通过对其构造环境的判别,提出罗布莎蛇绿岩属于岛弧型蛇绿岩范畴,其构造环境应为俯冲带之上(SSZ)的弧间盆地。
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| 关 键 词： | 蛇绿岩 罗布莎 雅鲁藏布江 弧间盆地 西藏 |
| 文章编号： | 1001-1552(2006)02-0231-10 |
| 收稿时间： | 2005-09-02 |
| 修稿时间： | 2005-12-28 |
GEOCHEMICAL CHARACTERISTICS AND ORIGIN OF THE LUOBUSA OPHIOLITE CRUST LAVAS IN XIZANG, CHINA |
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| ZHONG Lifeng,XIA Bin,CUI Xuejun,ZHOU Guoqing,CHEN Genwen,WEI Dongliang.GEOCHEMICAL CHARACTERISTICS AND ORIGIN OF THE LUOBUSA OPHIOLITE CRUST LAVAS IN XIZANG, CHINA[J].Geotectonica et Metallogenia,2006,30(2):231-240. |
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| Authors: | ZHONG Lifeng XIA Bin CUI Xuejun ZHOU Guoqing CHEN Genwen WEI Dongliang |
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| Institution: | 1. CAS Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, GD 510640, China ; 2. Graduate School, Chinese Academy of Sciences, Beijing 100039, China |
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| Abstract: | The Luobusa ophiolite is one of well-outcropped and well-studied rock suite that occurs in the eastern segment of Yarlung Zangbo ophiolite belt. The research results on Luobusa ophiolite crust lavas indicates that it belongs to the transitionary type between the sub-alkaline basalt and the andesite/basalt. It is rich in large ion lithophile elements such as Rb, K, Ba. The HFS elements distribution pattern shows a small positive slope, depletion in Nb, Ta, which implies that the ophiolite is affected by subduction. The chondrite-normalized REE pattern shows LREE-depleted and HREE-smoothed distribution, which demonstrates that the ophiolite is geochemically represented by N-MORB. According to the above discussions, and by combining the geochemical characters of the first transitional elements and based on discrimination of tectonic environment, we conclude that the Luobusa ophiolite belongs to the island-arc ophiolite formed in the interarc basin of supra-subduction zone. |
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| Keywords: | ophiolite Luobusa Yarlung Zangbo River interarc basin Tibet |
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