Trace Element and Isotopic Evidence for Recycled Lithosphere from Basalts from 48 to 53 degrees E, Southwest Indian Ridge

doi:10.1093/petrology/egaa068

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	Trace Element and Isotopic Evidence for Recycled Lithosphere from Basalts from 48 to 53 degrees E, Southwest Indian Ridge
	Wang, Jixin 1,3; Zhou, Huaiyang 3; Salters, Vincent J. M.2; Dick, Henry J. B.3,4; Standish, Jared J.4,5; Wang, Conghui 3
刊名	JOURNAL OF PETROLOGY
	2020-10-01
卷号	61 期号:10 页码:24
关键词	Southwest Indian Ridge mid-ocean ridge basalts incompatible elements isotopes
ISSN号	0022-3530
DOI	10.1093/petrology/egaa068
通讯作者	Zhou, Huaiyang(zhouhy@tongji.edu.cn)
英文摘要	Mantle source heterogeneity and magmatic processes have been widely studied beneath most parts of the Southwest Indian Ridge (SWIR). But less is known from the newly recovered midocean ridge basalts from the Dragon Bone Amagmatic Segment (53 degrees E, SWIR) and the adjacent magmatically robust Dragon Flag Segment. Fresh basalt glasses from the Dragon Bone Segment are clearly more enriched in isotopic composition than the adjacent Dragon Flag basalts, but the trace element ratios of the Dragon Flag basalts are more extreme compared with average midocean ridge basalts (MORB) than the Dragon Bone basalts. Their geochemical differences can be explained only by source differences rather than by variations in degree of melting of a roughly similar source. The Dragon Flag basalts are influenced by an arc-like mantle component as evidenced by enrichment in fluid-mobile over fluid-immobile elements. However, the sub-ridge mantle at the Dragon Flag Segment is depleted in melt component compared with a normal MORB source owing to previous melting in the subarc. This fluid-metasomatized, subarc depleted mantle is entrained beneath the Dragon Flag Segment. In comparison, for the Dragon Bone axial basalts, their Pb isotopic compositions and their slight enrichment in Ba, Nb, Ta, K, La, Sr and Zr and depletion in Pb and Ti concentrations show resemblance to the Ejeda-Bekily dikes of Madagascar. Also, Dragon Bone Sr and Nd isotopic compositions together with the Ce/Pb, La/Nb and La/Th ratios can be modeled by mixing the most isotopically depleted Dragon Flag basalts with a composition within the range of the Ejeda-Bekily dikes. It is therefore proposed that the Dragon Bone axial basalts, similar to the Ejeda-Bekily dikes, are sourced from subcontinental lithospheric Archean mantle beneath Gondwana, pulled from beneath the Madagascar Plateau. The recycling of the residual subarc mantle and the subcontinental lithospheric mantle could be related to either the breakup of Gondwana or the formation and accretion of Neoproterozoic island arc terranes during the collapse of the Mozambique Ocean, and is now present beneath the ridge.
资助项目	China Ocean Mineral Resources Research and Development Association (COMRA) ; National Key R&D Program of China[2018YFC0309903] ; National Natural Science Foundation of China[NSFC 42006051] ; Chinese National Key Basic Research Program[2012CB417300] ; US National Science Foundation (NSF OCE MGG)[1434452] ; Woods Hole Oceanographic Institution ; National Science Foundation Cooperative Agreement[DMR1644779] ; state of Florida
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000634895400001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/170248]
专题	中国科学院海洋研究所
通讯作者	Zhou, Huaiyang
作者单位	1.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 2.Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32306 USA 3.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China 4.Woods Hole Oceanog Inst, Dept Marine Geol & Geophys, Woods Hole, MA 02543 USA 5.Amer Chem Soc, 1155 Sixteenth St NW, Washington, DC 20036 USA
推荐引用方式 GB/T 7714	Wang, Jixin,Zhou, Huaiyang,Salters, Vincent J. M.,et al. Trace Element and Isotopic Evidence for Recycled Lithosphere from Basalts from 48 to 53 degrees E, Southwest Indian Ridge[J]. JOURNAL OF PETROLOGY,2020,61(10):24.
APA	Wang, Jixin,Zhou, Huaiyang,Salters, Vincent J. M.,Dick, Henry J. B.,Standish, Jared J.,&Wang, Conghui.(2020).Trace Element and Isotopic Evidence for Recycled Lithosphere from Basalts from 48 to 53 degrees E, Southwest Indian Ridge.JOURNAL OF PETROLOGY,61(10),24.
MLA	Wang, Jixin,et al."Trace Element and Isotopic Evidence for Recycled Lithosphere from Basalts from 48 to 53 degrees E, Southwest Indian Ridge".JOURNAL OF PETROLOGY 61.10(2020):24.