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Low-degree melt metasomatic origin of heavy Fe isotope enrichment in the MORB mantle
Guo, Pengyuan1,2,5; Niu, Yaoling1,2,3,4; Chen, Shuo1,2; Duan, Meng1,2; Sun, Pu1,2; Chen, Yanhong4; Gong, Hongmei1,2; Wang, Xiaohong1,2
2023
发表期刊EARTH AND PLANETARY SCIENCE LETTERS
ISSN0012-821X
卷号601页码:12
通讯作者Guo, Pengyuan(guopy@qdio.ac.cn)
摘要Studies of mid-ocean ridge basalts (MORB) show a variable Fe isotope composition of the oceanic upper mantle. To test a recent hypothesis that heavy Fe isotope enrichment in the MORB mantle results from the same process of incompatible element enrichment, we conduct an Fe isotope study of well -characterized MORB samples from a magmatically robust segment (OH-1) of the Mid-Atlantic Ridge (MAR) at similar to 35 degrees N. The data show large Fe isotope variation (556Fe = +0.03 to +0.18%0) that correlates well with the abundances and ratios of more-to-less incompatible elements and with Sr-Nd-Hf isotopes. Our findings in support of the hypothesis can be detailed as follows: (1) the oceanic upper mantle has a heterogeneous Fe isotope composition on varying small spatial scales with isotopically heavy Fe (high-556Fe) preferentially associated with pyroxenite lithologies; (2) such lithologies, which are also enriched in the progressively more incompatible elements, are of low-degree (low-F) melt metasomatic origin; (3) with all the conceivable processes considered, the low-F melt metasomatism takes place at the lithosphere-asthenosphere boundary (LAB) beneath ocean basins through crystallization of incipient (Low-F) melt in the seismic low velocity zone (LVZ) at the base of the growing oceanic lithosphere (i.e., LAB) over the Earth's history since the onset of plate tectonics, forming composite lithologies with geochemically enriched pyroxenite veins dispersed in the depleted peridotite matrix; (4) such mantle of composite lithology when transported to beneath the present-day ocean ridges will undergo decompression melting and produce MORB melts with geochemical trends of "melting-induced mixing" as observed at the MAR and global MORB; (5) we predict all this to be a globally common process and widespread.(c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
关键词mid-ocean ridge basalts Fe isotope upper mantle heterogeneity low-degree melt metasomatism Mid-Atlantic Ridge
DOI10.1016/j.epsl.2022.117892
收录类别SCI
语种英语
资助项目National Natural Science Foundation of China (NSFC) ; NSFC-Shandong Joint Fund for Marine Science Research Centers ; 111 Project ; [42076048] ; [91958215] ; [41776067] ; [41630968] ; [U1606401] ; [B18048]
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000885932200006
出版者ELSEVIER
引用统计
被引频次:6[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.qdio.ac.cn/handle/337002/180263
专题海洋地质与环境重点实验室
通讯作者Guo, Pengyuan
作者单位1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
3.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
4.China Univ Geosci, Beijing 100083, Peoples R China
5.Chinese Acad Sci, Inst Oceanol, 7 Nanhai Rd, Qingdao 266071, Shandong, Peoples R China
第一作者单位中国科学院海洋研究所
通讯作者单位中国科学院海洋研究所
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GB/T 7714
Guo, Pengyuan,Niu, Yaoling,Chen, Shuo,et al. Low-degree melt metasomatic origin of heavy Fe isotope enrichment in the MORB mantle[J]. EARTH AND PLANETARY SCIENCE LETTERS,2023,601:12.
APA Guo, Pengyuan.,Niu, Yaoling.,Chen, Shuo.,Duan, Meng.,Sun, Pu.,...&Wang, Xiaohong.(2023).Low-degree melt metasomatic origin of heavy Fe isotope enrichment in the MORB mantle.EARTH AND PLANETARY SCIENCE LETTERS,601,12.
MLA Guo, Pengyuan,et al."Low-degree melt metasomatic origin of heavy Fe isotope enrichment in the MORB mantle".EARTH AND PLANETARY SCIENCE LETTERS 601(2023):12.
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