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Reactive origin of mantle harzburgite: Evidence from orthopyroxene-spinel association

文献类型：期刊论文

作者Jing, Jie-Jun1,2,3; Su, Ben-Xun1,2; Xiao, Yan3; Zhang, Hong-Fu2,3; Uysal, Ibrahim4; Chen, Chen1,2; Lin, Wei2,3; Chu, Yang2,3; Saka, Samet4
刊名LITHOS
出版日期2019-10-01
卷号342页码:175-186
ISSN号0024-4937
关键词Orthopyroxene Spinel Melt/fluid-rock interaction Mantle harzburgite Continental margin
DOI10.1016/j.lithos.2019.05.011
英文摘要Harzburgites with high modal orthopyroxene (generally >23 vol%) in Archean craton, mantle wedge and oceanic lithospheric mantle are considered to be produced by the interaction between Si-rich liquids and rocks. However, the absence of samples from continental margin hinders the recognition whether this process is prevalent. Mantle xenoliths entrained in Miocene basalts from the Thrace Basin, the margin of Eurasian continent, are dominated by harzburgites with anomalously high orthopyroxene modes. These orthopyroxene grains closely associate with spinel and occasionally with clinopyroxene. In these orthopyroxene-spinel associations, orthopyroxene grains can be up to 1 cm in diameter and display high Al2O3 contents (1.41-4.61 wt%) and Mg# values (89.6-92.4), while spinel crystals are anhedral and bud-shaped and are commonly foliated, with a wide variation in Cr# values ranging from 7.8 to 52.7. The Fe2+/Fe3+ vs. TiO2 diagram shows lots of these spinels are "magmatic" (i.e. spinel crystallized from melts). The orthopyroxene grains have LREE diverging from the modelled melting trends, indicating possible metasomatism following partial melting. They are present in elongated shape, cutting across olivine grains and also replacing olivine as surrounding rims. Fine-grained olivine is occasionally enclosed in the orthopyroxene-spinel association. We, therefore, propose that the association of orthopyroxene and spinel developed from the melt/fluid-rock interaction. These features indicate mineral phase transformation from olivine to orthopyroxene, which can be expressed by the equation: 'Mg2SiO4 (Ol) + SiO2 = Mg2Si2O6 (Opx)'. The observed Al-rich rim of spinel and bud-shaped Al-spinel, suggest sufficient amount of AI in the Si-rich liquids. The mechanism involved here is the consumption of olivine to produce orthopyroxene and spinel as in the equation: Mg2SiO4 (Ol) + Al2O3 = MgSiO3 (Opx) + MgAl2O4 (Sp)'. The Si and Al were enriched in the percolating liquids. Both the high-Cr# and low-Cr# spinels with 'magmatic' features imply the percolating liquids were multi-staged or inhomogeneous Cr contents in the liquids. This melt/fluid-rock interaction may account for the formation of abundant harzburgites with high orthopyroxene modes in the Eurasian continental margin. Thus, it indicates the reacting harzburgites are prevalent in the lithospheric mantle beneath oceanic crust, Archean craton and mantle wedge, as well as in the continental margin. (C) 2019 Elsevier B.V. All rights reserved.
WOS关键词NW TURKEY IMPLICATIONS ; PERIDOTITE XENOLITHS ; LITHOSPHERIC MANTLE ; LHERZOLITE XENOLITHS ; CARBONATITE METASOMATISM ; CONTINENTAL-CRUST ; MELT INCLUSIONS ; VOLCANIC-ROCKS ; AVACHA VOLCANO ; RIDGE BASALT
资助项目National Natural Science Foundation of China[41673037] ; National Natural Science Foundation of China[41772055] ; National Natural Science Foundation of China[91855102] ; National Natural Science Foundation of China[91755205] ; State Key Laboratory of Lithospheric Evolution[201701] ; Youth Innovation Promotion Association, Chinese Academy of Sciences[2016067]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者ELSEVIER
WOS记录号WOS:000477091500011
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/92929]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Jing, Jie-Jun; Su, Ben-Xun
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R China
4.Karadeniz Tech Univ, Dept Geol Engn, TR-61080 Trabzon, Turkey
推荐引用方式
GB/T 7714		 Jing, Jie-Jun,Su, Ben-Xun,Xiao, Yan,et al. Reactive origin of mantle harzburgite: Evidence from orthopyroxene-spinel association[J]. LITHOS,2019,342:175-186.
APA Jing, Jie-Jun.,Su, Ben-Xun.,Xiao, Yan.,Zhang, Hong-Fu.,Uysal, Ibrahim.,...&Saka, Samet.(2019).Reactive origin of mantle harzburgite: Evidence from orthopyroxene-spinel association.LITHOS,342,175-186.
MLA Jing, Jie-Jun,et al."Reactive origin of mantle harzburgite: Evidence from orthopyroxene-spinel association".LITHOS 342(2019):175-186.

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来源：地质与地球物理研究所

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