中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
  4. 岩石圈演化国家重点实验室
Ultra-refractory mantle domains in the Luqu ophiolite (Tibet): Petrology and tectonic setting

文献类型：期刊论文

作者Zhang, Chang1,2; Liu, Chuan-Zhou1,3; Wu, Fu-Yuan1,3; Ji, Wen-Bin1; Liu, Tong1,2; Xu, Yang1,2
刊名LITHOS
出版日期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
DOI10.1016/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
WOS记录号WOS:000408286700017
出版者ELSEVIER SCIENCE BV
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)
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.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。