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

doi:10.1016/j.lithos.2014.01.005

CORC > 北京大学 > 地球与空间科学学院

	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
	Chen, Mi-Mi ; Tian, Wei ; Suzuki, Katsuhiko ; Tejada, M.L-G. ; Liu, Feng-Lin ; Senda, Ryoko ; Wei, Chun-Jing ; Chen, Bin ; Chu, Zhu-Yin
刊名	lithos
	2014
关键词	Mantle xenolith Peridotite Pyroxenite Tarim flood basalt Mantle plume Re-Os isotope OCEANIC UPPER-MANTLE SUBCONTINENTAL LITHOSPHERIC MANTLE NORTHWEST CHINA ABYSSAL PERIDOTITES REFRACTORY MANTLE CONTINENTAL LITHOSPHERE GEOLOGICAL IMPLICATIONS LHERZOLITE XENOLITHS ULTRAMAFIC XENOLITHS SPINEL-LHERZOLITES
DOI	10.1016/j.lithos.2014.01.005
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.; Geochemistry & Geophysics; Mineralogy; SCI(E); 0; ARTICLE; davidtian@pku.edu.cn; ,SI; 97-111; 204
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155400]
专题	地球与空间科学学院
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.
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.
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 (2014).