Molybdenum isotope systematics of lavas from the East Pacific Rise: Constraints on the source of enriched mid-ocean ridge basalt | |
Chen, Shuo1,2; Sun, Pu1,2 ; Niu, Yaoling2,3,4; Guo, Pengyuan1,2; Elliott, Tim5; Hin, Remco C.6
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| 2022-01-15 | |
| 发表期刊 | EARTH AND PLANETARY SCIENCE LETTERS
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| ISSN | 0012-821X |
| 卷号 | 578页码:10 |
| 通讯作者 | Chen, Shuo(shuochen@qdio.ac.cn) ; Sun, Pu(pu.sun@qdio.ac.cn) |
| 摘要 | Mid-ocean ridge basalts (MORB) reveal large mantle compositional heterogeneity, whose origin remains debated. Here we present a systematic study of molybdenum isotopes on well-characterized MORB glass samples from the East Pacific Rise (EPR) and near-EPR seamounts. Our analyses show significant Mo isotope variations with delta Mo-98/95 (relative to NIST SRM3134) ranging from -0.23 parts per thousand & nbsp;to -0.06 parts per thousand. We argue that these Mo isotope variations are not caused by processes of MORB melt generation and evolution but reflect mantle isotopic heterogeneity. Taking together with the literature data, we show that MORB Mo isotope compositions vary systematically with geochemical parameters indicating mantle enrichment. These observations are best explained by two-component mixing between an incompatible element depleted endmember (e.g., low La/Sm, Nb/La, Nb/Zr and Th/Yb, and high Sm/Nd and Nd-143/Nd-144) with low delta Mo-98/95 (~-0.21 parts per thousand)& nbsp;and an incompatible element enriched endmember (e.g., high La/Sm, Nb/La, Nb/Zr and Th/Yb, and low Sm/Nd and Nd-143/Nd-144) with high 898/95Mo (~-0.05 parts per thousand). The association of heavier Mo isotope compositions with the geochemically more enriched MORB is inconsistent with recycled ocean crust with or without sediment being the enriched endmember. Instead, this is consistent with the enriched endmember being of magmatic origin, most likely lithologies of low-degree melt metasomatic origin dispersed in the more depleted peridotite matrix in the MORB mantle. Thus, with MORB Mo isotope systematics, we confirm that recycled oceanic mantle lithosphere metasomatized by low degree melt plays a key role in the formation of E-MORB source lithologies. Our study also highlights Mo isotopes as an effective tool for studying upper mantle processes. (C)& nbsp;2021 The Author(s). Published by Elsevier B.V.& nbsp; |
| 关键词 | molybdenum isotope mid-ocean ridge basalt East Pacific Rise mantle heterogeneity |
| DOI | 10.1016/j.epsl.2021.117283 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Natural Science Foundation of China (NSFC)[41906050] ; National Natural Science Foundation of China (NSFC)[41630968] ; National Natural Science Foundation of China (NSFC)[9195821] ; NSFC-Shandong Joint Fund for Marine Science Research Centers grant[U1606401] ; Youth Innovation Promotion Association, Chinese Academy of Sciences[2021206] ; 111 Project[B18048] |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:000784334800007 |
| 出版者 | ELSEVIER |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/178880 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Chen, Shuo; Sun, Pu |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Lab Marine Geol, Pilot Natl Lab Marine Sci & Technol Qingdao, Qingdao 266061, Peoples R China 3.Univ Durham, Dept Earth Sci, Durham DH1 3LE, Durham, England 4.China Univ Geosci, Beijing 100083, Peoples R China 5.Univ Bristol, Sch Earth Sci, Bristol Isotope Grp, Bristol BS8 1RJ, England 6.Univ Bayreuth, Bayer Geoinst, D-95447 Bayreuth, Germany |
| 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 |
| 推荐引用方式 GB/T 7714 |
Chen, Shuo,Sun, Pu,Niu, Yaoling,et al. Molybdenum isotope systematics of lavas from the East Pacific Rise: Constraints on the source of enriched mid-ocean ridge basalt [J]. EARTH AND PLANETARY SCIENCE LETTERS,2022,578:10. |
| APA |
Chen, Shuo,Sun, Pu,Niu, Yaoling,Guo, Pengyuan,Elliott, Tim,&Hin, Remco C..(2022). Molybdenum isotope systematics of lavas from the East Pacific Rise: Constraints on the source of enriched mid-ocean ridge basalt .EARTH AND PLANETARY SCIENCE LETTERS,578,10. |
| MLA |
Chen, Shuo,et al." Molybdenum isotope systematics of lavas from the East Pacific Rise: Constraints on the source of enriched mid-ocean ridge basalt ".EARTH AND PLANETARY SCIENCE LETTERS 578(2022):10. |
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