<p>Molybdenum isotope systematics of lavas from the East Pacific Rise: Constraints on the source of enriched mid-ocean ridge basalt</p>

doi:10.1016/j.epsl.2021.117283

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Molybdenum isotope systematics of lavas from the East Pacific Rise: Constraints on the source of enriched mid-ocean ridge basalt
	Chen, Shuo 4,5; Sun, Pu 4,5; Niu, Yaoling 2,3,4; Guo, Pengyuan 4,5; Elliott, Tim 6; Hin, Remco C.1
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2022-01-15
卷号	578 页码:10
关键词	molybdenum isotope mid-ocean ridge basalt East Pacific Rise mantle heterogeneity
ISSN号	0012-821X
DOI	10.1016/j.epsl.2021.117283
通讯作者	Chen, Shuo(shuochen@qdio.ac.cn) ; Sun, Pu(pu.sun@qdio.ac.cn)
英文摘要	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;
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
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000784334800007
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/178879]
专题	海洋研究所_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.Univ Bayreuth, Bayer Geoinst, D-95447 Bayreuth, Germany 2.China Univ Geosci, Beijing 100083, Peoples R China 3.Univ Durham, Dept Earth Sci, Durham DH1 3LE, Durham, England 4.Lab Marine Geol, Pilot Natl Lab Marine Sci & Technol Qingdao, Qingdao 266061, Peoples R China 5.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 6.Univ Bristol, Sch Earth Sci, Bristol Isotope Grp, Bristol BS8 1RJ, England
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.