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Persistence of fertile and hydrous lithospheric mantle beneath the northwestern Ethiopian plateau: Evidence from modal, trace element and Sr-Nd-Hf isotopic compositions of amphibole-bearing mantle xenoliths

文献类型：期刊论文

作者Alemayehu, Melesse1,2; Zhang, Hong-Fu1,3; Aulbach, Sonja4
刊名LITHOS
出版日期2017-07-01
卷号284页码:401-415
关键词Ethiopian plateau mantle xenoliths amphibole metasomatism Sr-Nd-Hf isotopes
ISSN号0024-4937
DOI10.1016/j.lithos.2017.04.021
文献子类Article
英文摘要We present new trace element compositions of amphiboles, Sr-Nd-Hf isotope compositions of clinopyroxenes and mineral modes for spinet peridotite xenoliths that were entrained in a Miocene alkali basalt (Gundeweyn, northwestern Ethiopian plateau), in order to understand the geochemical evolution and variation occurring within the continental lithospheric mantle (CLM) in close proximity to the East African Rift system, and its dynamic implications. With the exception of a single amphibole-bearing sample that is depleted in LREE (La/Yb-N = 0.45 x Cl), amphiboles in lherzolites and in one harzburgite show variable degrees of LREE enrichment (La/YbN = 2.5-12.1 x Cl) with flat HREE (Dy/Yb-N = 1.5-2.1 x Cl). Lherzolitic clinoyroxenes have Sr-87/Sr-86 (0.70227 to 0.70357), Nd-143/Nd-144 (0.51285 to 0.51346), and Hf-176/Hf-177 (0.28297 to 0.28360) ranging between depleted lithosphere and enriched mantle. LREE-enriched clinopyroxenes generally have more enriched isotope compositions than depleted ones. While lherzolites with isotope compositions similar to those of the Afar plume result from the most recent metasomatic overprint, isotope compositions more depleted than present-day MORB can be explained by an older melt extraction and/or isotopic rehomogenisation event, possibly related to the Pan-African orogeny.
WOS关键词EAST-AFRICAN RIFT ; SPINEL PERIDOTITE XENOLITHS ; PLATINUM-GROUP ELEMENTS ; NORTH CHINA CRATON ; COLLECTOR ICP-MS ; VOLCANIC PROVINCE ; CONTINENTAL LITHOSPHERE ; MASS-SPECTROMETRY ; SOUTHERN ETHIOPIA ; MELT PERCOLATION
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000405252300026
出版者ELSEVIER SCIENCE BV
资助机构Chinese Academy of Sciences(2014FFBZ003) ; Chinese Academy of Sciences(2014FFBZ003) ; National Science Foundation of China(41450110429) ; National Science Foundation of China(41450110429) ; (91414301) ; (91414301) ; Chinese Academy of Sciences(2014FFBZ003) ; Chinese Academy of Sciences(2014FFBZ003) ; National Science Foundation of China(41450110429) ; National Science Foundation of China(41450110429) ; (91414301) ; (91414301) ; Chinese Academy of Sciences(2014FFBZ003) ; Chinese Academy of Sciences(2014FFBZ003) ; National Science Foundation of China(41450110429) ; National Science Foundation of China(41450110429) ; (91414301) ; (91414301) ; Chinese Academy of Sciences(2014FFBZ003) ; Chinese Academy of Sciences(2014FFBZ003) ; National Science Foundation of China(41450110429) ; National Science Foundation of China(41450110429) ; (91414301) ; (91414301)
源URL[http://ir.iggcas.ac.cn/handle/132A11/43595]  
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Alemayehu, Melesse; Zhang, Hong-Fu
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R China
2.Adama Sci & Technol Univ, Dept Earth Sci, Sch Appl Sci, POB 1888, Adama, Ethiopia
3.Northwest Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
4.Goethe Univ Frankfurt, Inst Geowissensch, D-60438 Frankfurt, Germany
推荐引用方式
GB/T 7714		 Alemayehu, Melesse,Zhang, Hong-Fu,Aulbach, Sonja. Persistence of fertile and hydrous lithospheric mantle beneath the northwestern Ethiopian plateau: Evidence from modal, trace element and Sr-Nd-Hf isotopic compositions of amphibole-bearing mantle xenoliths[J]. LITHOS,2017,284:401-415.
APA Alemayehu, Melesse,Zhang, Hong-Fu,&Aulbach, Sonja.(2017).Persistence of fertile and hydrous lithospheric mantle beneath the northwestern Ethiopian plateau: Evidence from modal, trace element and Sr-Nd-Hf isotopic compositions of amphibole-bearing mantle xenoliths.LITHOS,284,401-415.
MLA Alemayehu, Melesse,et al."Persistence of fertile and hydrous lithospheric mantle beneath the northwestern Ethiopian plateau: Evidence from modal, trace element and Sr-Nd-Hf isotopic compositions of amphibole-bearing mantle xenoliths".LITHOS 284(2017):401-415.

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来源：地质与地球物理研究所

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