Ultra-refractory mantle domains in the Luqu ophiolite (Tibet): Petrology and tectonic setting

doi:10.1016/j.lithos.2017.05.021

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	Ultra-refractory mantle domains in the Luqu ophiolite (Tibet): Petrology and tectonic setting
	Zhang, Chang1,2 ; Liu, Chuan-Zhou 1,3; Wu, Fu-Yuan 1,3; Ji, Wen-Bin 1; Liu, Tong 1,2; Xu, Yang 1,2
刊名	LITHOS
	2017-08-01
卷号	286 页码:252-263
关键词	Mantle peridotites Ultra-refractory mantle Partial melting Xigaze ophiolites Tibetan Plateau
ISSN号	0024-4937
DOI	10.1016/j.lithos.2017.05.021
文献子类	Article
英文摘要	Fresh mantle peridotites occur in the Luqu ophiolite, which is located at the central segment of the Yarlung-Tsangpo Suture Zone in the Tibetan Plateau. This study presents major and trace element compositions of clinopyroxene from harzburgites and dunites of the Luqu ophiolite, with the aim to study melt depletion and late-stage melt-rock interaction processes. The studied harzburgites have refractory to ultra-refractory compositions, as indicated by low whole-rock Al2O3 and high MgO contents, as well as high spinel Cr# values. Clinopyroxenes in the Luqu harzburgites are variably depleted in light rare earth elements (LREEs) relative to the middle and heavy rare earth elements (MREEs and HREEs), with Yb contents of 1.4-3.4 times of CI chondrites. Modeling results suggest that the Luqu harzburgites have experienced up to 8% garnet-facies melting followed by 10-18% fractional melting in the stability field of spinel. In both cases melting occurred under anhydrous conditions. This suggests that the Luqu ophiolite originated from a mid-ocean ridge setting rather than a supra-subduction zone environment. Nevertheless, the high degrees of partial melting are inconsistent with the thin oceanic crustal sequence preserved in the Luqu ophiolite, implying that the Luqu peridotites might have experienced melt extraction prior to entering into the spreading centers of the Neo-Tethyan Ocean during the Early Cretaceous. Clinopyroxenes in the dunites are interstitial among olivine grains. They display slightly LREE-enriched patterns and have higher REE contents than those in the harzburgites. They also show markedly positive anomalies in Sr, Zr and Hf. These features suggest that the dunites were generated through reaction between percolating melts and the harzburgites, during which the interstitial clinopyroxenes formed. (C) 2017 Elsevier B.V. All rights reserved.
WOS关键词	ZANGBO SUTURE ZONE ; MID-ATLANTIC RIDGE ; MELT-ROCK INTERACTION ; BENEATH GAKKEL RIDGE ; OCEANIC UPPER-MANTLE ; ZIRCON U-PB ; SOUTHERN TIBET ; ABYSSAL PERIDOTITES ; XIGAZE OPHIOLITE ; YUNGBWA OPHIOLITE
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000408286700017
资助机构	National Natural Science Foundation of China(41673038) ; National Natural Science Foundation of China(41673038) ; Key Research Program of Frontier Sciences from CAS(QYZDB-SSW-DQC032) ; Key Research Program of Frontier Sciences from CAS(QYZDB-SSW-DQC032) ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB03010201) ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB03010201) ; National Natural Science Foundation of China(41673038) ; National Natural Science Foundation of China(41673038) ; Key Research Program of Frontier Sciences from CAS(QYZDB-SSW-DQC032) ; Key Research Program of Frontier Sciences from CAS(QYZDB-SSW-DQC032) ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB03010201) ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB03010201) ; National Natural Science Foundation of China(41673038) ; National Natural Science Foundation of China(41673038) ; Key Research Program of Frontier Sciences from CAS(QYZDB-SSW-DQC032) ; Key Research Program of Frontier Sciences from CAS(QYZDB-SSW-DQC032) ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB03010201) ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB03010201) ; National Natural Science Foundation of China(41673038) ; National Natural Science Foundation of China(41673038) ; Key Research Program of Frontier Sciences from CAS(QYZDB-SSW-DQC032) ; Key Research Program of Frontier Sciences from CAS(QYZDB-SSW-DQC032) ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB03010201) ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB03010201)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/61914]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Liu, Chuan-Zhou
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Chang,Liu, Chuan-Zhou,Wu, Fu-Yuan,et al. Ultra-refractory mantle domains in the Luqu ophiolite (Tibet): Petrology and tectonic setting[J]. LITHOS,2017,286:252-263.
APA	Zhang, Chang,Liu, Chuan-Zhou,Wu, Fu-Yuan,Ji, Wen-Bin,Liu, Tong,&Xu, Yang.(2017).Ultra-refractory mantle domains in the Luqu ophiolite (Tibet): Petrology and tectonic setting.LITHOS,286,252-263.
MLA	Zhang, Chang,et al."Ultra-refractory mantle domains in the Luqu ophiolite (Tibet): Petrology and tectonic setting".LITHOS 286(2017):252-263.