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Refertilization of lithospheric mantle beneath the North China Craton in Mesozoic: Evidence from in situ Sr isotopes of Fuxin peridotite

文献类型：期刊论文

作者Zou, Dongya3; Zhang, Hongfu3; Zhang, Xiaoqi3; Zhang, Huiting1,3; Su, Benxun2
刊名LITHOS
出版日期2020-07-01
卷号364页码:13
关键词Peridotite xenolith In situ Sr isotopes Refertilization of SCLM Asthenospheric upwelling Mesozoic SCLM evolution
ISSN号0024-4937
DOI10.1016/j.lithos.2020.105478
英文摘要The Mesozoic was a critical period for the evolution of the North China Craton (NCC). We present the petrological observations and in situ mineral major and trace elements and Sr isotopic data for spinet harzburgite and Iherzolite xenoliths in Late Cretaceous Fuxin basalts from the northern margin of the NCC. These data are used to investigate the nature and evolution of the subcontinental lithospheric mantle (SCLM) beneath the NCC during the Mesozoic. The peridotite xenoliths commonly have porphyroclastic and granoblastic textures, and can be divided into high-Mg# and low-Mg# peridotites. Compared with the low-Mg# peridotites, the high-Mg# peridotites have higher olivine Fo (>91) and spinel Cr# values (>35), and their dinopyroxenes are light REE-enriched with uniform Sr-87/(86) Sr ratios (ca. 0.7042). These observations suggest that the high-Mg# peridotites could be relics of old SCLM and were metasomatized by melts derived from subducted Paleo-Asian oceanic slab. The low-Mg# peridotites are characterized by minerals with sieve textures and melt pockets. The olivine Fo of the low-Mg# peridotites are low and variable (81.2-90.4), and decrease from core to rim in some crystals. Thus, the low-Mg# peridotites underwent extensive peridotite-melt interactions. Their dinopyroxenes are enriched in LREE and show large variations in the Sr-87/Sr-86 ratios (0.7039-0.7052). Moreover, Sr-87/Sr-86 ratios positively correlate with MgO and negatively correlate with Al2O3, Eu and Dy contents. These observations suggest that the low-Mg# peridotites experienced multiple stages of mantle metasomatism, involving high Sr-87/Sr-86 melts derived from the subducted Paleo-Asian oceanic crust in early stage and low Sr-87/Sr-86 melts derived from more recent asthenospheric u pwelling. Therefore, the low-Mg# peridotites are representative of SCLM fragments that were strongly modified beneath the Fuxin region during the Late Cretaceous. Combined with previous studies, our findings suggest that refertilization of the SCLM by asthenospheric melts beneath the northern margin of the NCC commenced before eruption of the Fuxin basalts (ca. 100 Ma), which is much earlier than previously thought. This process resulted in a highly heterogeneous SCLM. In addition, the Tan-Lu Fault contributed substantially to the evolution of the SCLM beneath the NCC during the Mesozoic. (C) 2020 Published by Elsevier B.V.
WOS关键词SINO-KOREAN CRATON ; LU FAULT ZONE ; TRACE-ELEMENT ; EASTERN CHINA ; ULTRAMAFIC XENOLITHS ; SHANDONG PROVINCE ; OCEANIC-CRUST ; EXPERIMENTAL CONSTRAINTS ; MELT PERCOLATION ; CENOZOIC BASALTS
资助项目National Natural Science Foundation of China[41688103] ; National Natural Science Foundation of China[91755205]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000536183500001
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/96671]  
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Zhang, Hongfu
作者单位1.Xian Univ Sci & Technol, Coll Geol & Environm, Xian 710054, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
推荐引用方式
GB/T 7714		 Zou, Dongya,Zhang, Hongfu,Zhang, Xiaoqi,et al. Refertilization of lithospheric mantle beneath the North China Craton in Mesozoic: Evidence from in situ Sr isotopes of Fuxin peridotite[J]. LITHOS,2020,364:13.
APA Zou, Dongya,Zhang, Hongfu,Zhang, Xiaoqi,Zhang, Huiting,&Su, Benxun.(2020).Refertilization of lithospheric mantle beneath the North China Craton in Mesozoic: Evidence from in situ Sr isotopes of Fuxin peridotite.LITHOS,364,13.
MLA Zou, Dongya,et al."Refertilization of lithospheric mantle beneath the North China Craton in Mesozoic: Evidence from in situ Sr isotopes of Fuxin peridotite".LITHOS 364(2020):13.

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来源：地质与地球物理研究所

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