The nature and origin of upper mantle heterogeneity beneath the Mid-Atlantic Ridge 33-35 degrees N: A Sr-Nd-Hf isotopic perspective

doi:10.1016/j.gca.2021.05.033

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

	The nature and origin of upper mantle heterogeneity beneath the Mid-Atlantic Ridge 33-35 degrees N: A Sr-Nd-Hf isotopic perspective
	Guo, Pengyuan 1,2; Niu, Yaoling 1,2,3,4; Sun, Pu 1,2; Zhang, Junjie 1,2; Chen, Shuo 1,2; Duan, Meng 1,2; Gong, Hongmei 1,2; Wang, Xiaohong 1,2
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
	2021-08-15
卷号	307 页码:72-85
关键词	Mid-Atlantic Ridge Mid-ocean ridge basalt Sr-Nd-Hf isotopes Upper mantle heterogeneity Mantle endmembers
ISSN号	0016-7037
DOI	10.1016/j.gca.2021.05.033
通讯作者	Guo, Pengyuan(guopy@qdio.ac.cn)
英文摘要	We present new Sr-Nd-Hf isotopic data on mid-ocean ridge basalts from two ridge segments (OH-1, OH-3) between the Oceanographer and Hayes fracture zones at the Mid-Atlantic Ridge 33-35 degrees N to constrain the nature and origin of upper mantle heterogeneity beneath the Mid-Atlantic Ridge. Together with the major and trace elements data (Niu et al., 2001), the new Sr-Nd-Hf isotopic data illustrate that the mantle sources of these lavas comprise three components, i.e., a depleted mantle with high radiogenic Hf isotopic compositions (ADM), an incompatible elemental enriched component with radio genic Sr and un-radiogenic Nd-Hf isotopic compositions (E-type I), and an incompatible element depleted component with variably enriched Sr-Nd-Hf isotope compositions (i.e., E-type II). The ADM and E-type I components may be understood as representing ancient mantle melting residues and metasomatic veins developed at the base of the thickening oceanic lithosphere, respectively. The unique E-type II component is best explained as recent mantle melting residues of a geochemically enriched mantle, probably associated with the Azores mantle plume to the north. Taking together, we interpret the E-MORB dominated OH-1 lavas as resulting from a relatively higher degree melting of a mantle source composed of ADM matrix and E-type I material, whereas the N-MORB dominated OH-3 lavas resulting from lower degree melting of the mantle source primarily comprising ADM and E-type II components. Such a petrological and geochemical understanding explains the contrast in crustal thickness, ridge morphology and tomography, and mantle Bouguer anomalies between the two ridge segments. (C) 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).
资助项目	NSFC[41776067] ; NSFC[41630968] ; NSFC[91958215] ; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1606401] ; 111 Project[B18048]
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000675277300005
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/175751]
专题	海洋研究所_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, Qingdao 266061, Peoples R China 3.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England 4.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Guo, Pengyuan,Niu, Yaoling,Sun, Pu,et al. The nature and origin of upper mantle heterogeneity beneath the Mid-Atlantic Ridge 33-35 degrees N: A Sr-Nd-Hf isotopic perspective[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2021,307:72-85.
APA	Guo, Pengyuan.,Niu, Yaoling.,Sun, Pu.,Zhang, Junjie.,Chen, Shuo.,...&Wang, Xiaohong.(2021).The nature and origin of upper mantle heterogeneity beneath the Mid-Atlantic Ridge 33-35 degrees N: A Sr-Nd-Hf isotopic perspective.GEOCHIMICA ET COSMOCHIMICA ACTA,307,72-85.
MLA	Guo, Pengyuan,et al."The nature and origin of upper mantle heterogeneity beneath the Mid-Atlantic Ridge 33-35 degrees N: A Sr-Nd-Hf isotopic perspective".GEOCHIMICA ET COSMOCHIMICA ACTA 307(2021):72-85.