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Magnesium isotopic constraints on the lithospheric mantle metasomatism beneath the craton margin

文献类型：期刊论文

作者Zhu, Yu-Sheng1; Yang, Jin-Hui2,3; Sun, Jin-Feng3; Wang, Hao2; Mei, Qing-Feng2
刊名LITHOS
出版日期2023-12-01
卷号460页码:11
ISSN号0024-4937
关键词Magnesium isotope Mantle metasomatism Recycled crust Alkaline rock North China Craton
DOI10.1016/j.lithos.2023.107372
英文摘要The magnesium (Mg) isotopic distinction between surficial carbonate and mantle rock makes the Mg isotopes a potential tracer for recycled crustal materials (especially the carbonate-bearing materials) within the mantle. However, whether or to what extent recycled carbonate-bearing crustal materials could influence the Mg isotopes of the lithospheric mantle is still in debate. Here, we report the Mg isotope data for three well-characterized alkaline complexes from the northern margin of the North China Craton, i.e., the Hekanzi, Yaojiazhuang and Saima alkaline complexes. These alkaline rocks were all derived from enriched lithospheric mantle sources beneath the craton margin that were variably metasomatized by carbonate-bearing recycled crustal materials. However, they have relatively homogeneous and normal mantle-like 626Mg values, i.e.,-0.23 to-0.25%o for the Hekanzi,-0.20 to-0.30%o for the Yaojiazhuang and -0.25 to-0.30%o for the Saima alkaline rocks, respectively. These Mg isotopic characteristics were unrelated to shallow crustal processes (i.e., surface alteration, fractional crystallization and crustal assimilation) but inherited from the mantle sources. The mantle-like Mg isotopes suggest that the recycled carbonate-bearing crustal materials did not change the Mg isotopic compositions of the lithospheric mantle overlying the subduction zone, which mainly ascribes to the large contrast of MgO contents between the recycled crustal materials and the lithospheric mantle peridotite. The MgO contents of calcite-rich carbonates in the metasomatic agents released from the subducted crustal materials are too low to induce Mg isotopic anomaly in the MgO-rich peridotite. Our work reveals that Mg isotopes might not be a sensitive tracer of carbonate melt/fluid metasomatism in the lithospheric mantle beneath the craton margins.
WOS关键词NORTH CHINA CRATON ; SAIMA ALKALINE COMPLEX ; CHROMITE CRYSTALLIZATION ; GEOCHEMICAL EVIDENCE ; LIAODONG PENINSULA ; ELEMENT CHEMISTRY ; LOWER CRUST ; ROCKS ; FRACTIONATION ; PETROGENESIS
资助项目National Natural Science Foundation of China[42272061] ; National Natural Science Foundation of China[42288201]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者ELSEVIER
WOS记录号WOS:001088672900001
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 ; 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/132A11/110713]  
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
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Zhu, Yu-Sheng
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Zhu, Yu-Sheng,Yang, Jin-Hui,Sun, Jin-Feng,et al. Magnesium isotopic constraints on the lithospheric mantle metasomatism beneath the craton margin[J]. LITHOS,2023,460:11.
APA Zhu, Yu-Sheng,Yang, Jin-Hui,Sun, Jin-Feng,Wang, Hao,&Mei, Qing-Feng.(2023).Magnesium isotopic constraints on the lithospheric mantle metasomatism beneath the craton margin.LITHOS,460,11.
MLA Zhu, Yu-Sheng,et al."Magnesium isotopic constraints on the lithospheric mantle metasomatism beneath the craton margin".LITHOS 460(2023):11.

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来源：地质与地球物理研究所

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