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Peridotite and pyroxenite xenoliths from Tarim, NW China: Evidences for melt depletion and mantle refertilization in the mantle source region of the Tarim flood basalt

文献类型：期刊论文

作者Chen, Mi-Mi1; Tian, Wei1; Suzuki, Katsuhiko2; Tejada, M. -L-G.2; Liu, Feng-Lin1; Senda, Ryoko2; Wei, Chun-Jing1; Chen, Bin1; Chu, Zhu-Yin3
刊名LITHOS
出版日期2014-09-01
卷号204页码:97-111
关键词Mantle xenolith Peridotite Pyroxenite Tarim flood basalt Mantle plume Re-Os isotope
ISSN号0024-4937
DOI10.1016/j.lithos.2014.01.005
文献子类Article
英文摘要Mantle-derived spinel peridotite and spinel plagioclase pyroxenite xenoliths hosted in Cenozoic alkali basalts (20 Ma) are found in the Xikeer area, western Tarim Block, NW China. Based on petrographic and geochemical characteristics, the peridotite xenoliths are divided into three groups. Group 1 peridotite xenoliths have experienced high degree melt extraction (similar to 17% fractional melting) and weak, incipient metasomatism. Group 2 and 3 peridotite xenoliths have undergone extensive silicate melt metasomatism, resulting in clinopyroxenes with spoon-shaped and highly fractionated REE patterns respectively. Although their present texture is metamorphic, the pyroxenite xenoliths were initially of metasomatic origin, with high pressure protolith mineral assemblage of orthopyroxene + clinopyroxene + spinel +/- olivine. Numerical modeling of the Mg-number shows that the Xikeer pyroxenites may have resulted from reaction between Group 1 peridotite and a primitive Permian picritic melt at a high melt/rock ratio (>15) and that the host basanite is incapable of being the metasomatic melt The Re-Os isotopic systematics of the Xikeer peridotites and pyroxenites yield an apparent isochron of similar to 290 Ma, virtually identical to the age of Tarim flood basalts. Their epsilon(Nd)(t = 290 Ma) ranges from + 9.5 to +143, typical of convecting mantle. We propose that the Xikeer xenolith suite may have been initially formed by melt extraction from the convecting mantle and, shortly after, was refertilized by Tarim mantle plume melts during the Early Permian, a process which is referred to as mantle 'auto-refertilization'. (C) 2014 Elsevier B.V. All rights reserved.
WOS关键词OCEANIC UPPER-MANTLE ; SUBCONTINENTAL LITHOSPHERIC MANTLE ; NORTHWEST CHINA ; ABYSSAL PERIDOTITES ; REFRACTORY MANTLE ; CONTINENTAL LITHOSPHERE ; GEOLOGICAL IMPLICATIONS ; LHERZOLITE XENOLITHS ; ULTRAMAFIC XENOLITHS ; SPINEL-LHERZOLITES
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000342260400010
出版者ELSEVIER SCIENCE BV
资助机构NSFC(41072040 ; NSFC(41072040 ; "973" project(2010CB808906) ; "973" project(2010CB808906) ; 41121062 ; 41121062 ; 41272368) ; 41272368) ; NSFC(41072040 ; NSFC(41072040 ; "973" project(2010CB808906) ; "973" project(2010CB808906) ; 41121062 ; 41121062 ; 41272368) ; 41272368) ; NSFC(41072040 ; NSFC(41072040 ; "973" project(2010CB808906) ; "973" project(2010CB808906) ; 41121062 ; 41121062 ; 41272368) ; 41272368) ; NSFC(41072040 ; NSFC(41072040 ; "973" project(2010CB808906) ; "973" project(2010CB808906) ; 41121062 ; 41121062 ; 41272368) ; 41272368)
源URL[http://ir.iggcas.ac.cn/handle/132A11/85625]  
专题中国科学院地质与地球物理研究所
通讯作者Tian, Wei
作者单位1.Peking Univ, Sch Earth & Space Sci, MOE, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China
2.Japan Agcy Marine Earth Sci & Technol, Inst Res Earth Evolut, Yokosuka, Kanagawa 2370061, Japan
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Mi-Mi,Tian, Wei,Suzuki, Katsuhiko,et al. Peridotite and pyroxenite xenoliths from Tarim, NW China: Evidences for melt depletion and mantle refertilization in the mantle source region of the Tarim flood basalt[J]. LITHOS,2014,204:97-111.
APA Chen, Mi-Mi.,Tian, Wei.,Suzuki, Katsuhiko.,Tejada, M. -L-G..,Liu, Feng-Lin.,...&Chu, Zhu-Yin.(2014).Peridotite and pyroxenite xenoliths from Tarim, NW China: Evidences for melt depletion and mantle refertilization in the mantle source region of the Tarim flood basalt.LITHOS,204,97-111.
MLA Chen, Mi-Mi,et al."Peridotite and pyroxenite xenoliths from Tarim, NW China: Evidences for melt depletion and mantle refertilization in the mantle source region of the Tarim flood basalt".LITHOS 204(2014):97-111.

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来源：地质与地球物理研究所

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