中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Diverse origins of pyroxenite xenoliths from Yangyuan, North China Craton: implications for the modification of lithosphere by magma underplating and melt-rock interactions

文献类型:期刊论文

作者Liu, Ya-Dong2,3,4; Ying, Ji-Feng2,3,4; Li, Jian2,3,4; Sun, Yang1,2; Teng, Fang-Zhen5
刊名LITHOS
出版日期2020-11-01
卷号372页码:15
关键词Pyroxenite xenoliths North China Craton Lithospheric mantle Sr-Nd-Mg isotopes
ISSN号0024-4937
DOI10.1016/j.lithos.2020.105680
英文摘要(W)e present detailed major-, trace-element and Sr-Nd-Mg isotopic geochemistry for a suite of pyroxenite xenoliths entrained in Oligocene basalts in Yangyuan county, North China Craton, to reveal their origins and to further constrain the evolution of the lithospheric mantle beneath this area. The Yangyuan pyroxenites exhibit a lithologic spectrum ranging from orthopyroxenite, through orthopyroxene-rich websterite and clinopyroxene-rich websterite to clinopyroxenite. Their equilibrium temperatures (874-975 degrees C), which are within the temperature range of the upper mantle and lower crust, suggest that they came from the crust-mantle transition zone. The Yangyuan pyroxenite xenoliths can be subdivided into three types based on the compositions of their constituent clinopyroxene. Clinopyroxenes in the type I pyroxenites are characterized by high Mg-# (88.3-92.0; Mg-# = Mg/(Mg + Fe2+)*100) and Cr2O3 contents (0.86-1.63 wt.%). Their resemblance to those from the peridotite xenoliths, together with their light rare earth element (LREE) enrichment, indicates that the type I pyroxenites should be produced by lithological heterogeneity in the mantle, which may have including metasomatism. Clinopyroxenes in the type II pyroxenites have intermediate Mg-# (81.0-86.7) and Cr2O3 contents (0.53-0.73 wt.%), which are similar to those of strongly metasomatized mantle-derived Fe-lherzolite xenoliths. Their LREE-enriched compositions, as well as the high Ni contents of the orthopyroxenes and clinopyroxenes, suggest that the type II pyroxenites were produced by melt-peridotite interactions. Clinopyroxenes from type III pyroxenites have the lowest Mg-# (65.2-76.5) and Cr2O3 contents (0.05-0.38 wt.%), which are comparable to those formed by fractional crystallization of primary basalts, suggesting that they are the products of fractional crystallization. The high Mg-#, Ti/Eu ratios, the low (La/Yb)(N) and Ca/Al ratios, and Rb and Ba contents of the clinopyroxenes, as well as the depleted Sr-Nd isotopes of most of the Yangyuan pyroxenites, suggest that asthenosphere or juvenile lithospheric mantle-derived silicate melts were probably involved in their formation, whereas the enriched Sr-Nd isotopes of sample YY17-5 indicate that its source may have mixed with melts derived from recycled ancient lower crust. The light and variable Mg isotopic compositions (delta Mg-26 = -0.23 to -0.46 parts per thousand) of the Yangyuan pyroxenites suggest contributions from a subducted oceanic slab. The diverse origins of these pyroxenite xenoliths provide evidence that the deep lithosphere beneath Yangyuan has been modified by multiple melt-rock interactions and magma underplating. (C) 2020 Elsevier B.V. Al( rights reserved.
WOS关键词SINO-KOREAN CRATON ; MANTLE BENEATH ; TRACE-ELEMENT ; ISOTOPIC SYSTEMATICS ; PERIDOTITE XENOLITHS ; ULTRAMAFIC XENOLITHS ; CRUSTAL COMPONENTS ; CONTINENTAL-CRUST ; OS ISOTOPES ; SR
资助项目[41688103] ; [41873036] ; [41473035]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000571822700016
出版者ELSEVIER
源URL[http://ir.iggcas.ac.cn/handle/132A11/98270]  
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Ying, Ji-Feng
作者单位1.Acad Sinica, Inst Earth Sci, Taipei 11529, Taiwan
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
5.Univ Washington, Dept Earth & Space Sci, Isotope Lab, Seattle, WA 98195 USA
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Liu, Ya-Dong,Ying, Ji-Feng,Li, Jian,et al. Diverse origins of pyroxenite xenoliths from Yangyuan, North China Craton: implications for the modification of lithosphere by magma underplating and melt-rock interactions[J]. LITHOS,2020,372:15.
APA Liu, Ya-Dong,Ying, Ji-Feng,Li, Jian,Sun, Yang,&Teng, Fang-Zhen.(2020).Diverse origins of pyroxenite xenoliths from Yangyuan, North China Craton: implications for the modification of lithosphere by magma underplating and melt-rock interactions.LITHOS,372,15.
MLA Liu, Ya-Dong,et al."Diverse origins of pyroxenite xenoliths from Yangyuan, North China Craton: implications for the modification of lithosphere by magma underplating and melt-rock interactions".LITHOS 372(2020):15.

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来源:地质与地球物理研究所

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