气候变化领域集成服务门户(CCPortal): Distinct formation history for deep-mantle domains reflected in geochemical differences

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DOI	10.1038/s41561-020-0599-9
	Distinct formation history for deep-mantle domains reflected in geochemical differences
	Doucet L.S.; Li Z.-X.; Gamal El Dien H.; Pourteau A.; Murphy J.B.; Collins W.J.; Mattielli N.; Olierook H.K.H.; Spencer C.J.; Mitchell R.N.
发表日期	2020
ISSN	17520894
起始页码	511
结束页码	515
卷号	13 期号:7
英文摘要	The Earth’s mantle is currently divided into the African and Pacific domains, separated by the circum-Pacific subduction girdle, and each domain features a large low shear-wave velocity province (LLSVP) in the lower mantle. However, it remains controversial as to whether the LLSVPs have been stationary through time or dynamic, changing in response to changes in global subduction geometry. Here we compile radiogenic isotope data on plume-induced basalts from ocean islands and oceanic plateaus above the two LLSVPs that show distinct lead, neodymium and strontium isotopic compositions for the two mantle domains. The African domain shows enrichment by subducted continental material during the assembly and breakup of the supercontinent Pangaea, whereas no such feature is found in the Pacific domain. This deep-mantle geochemical dichotomy reflects the different evolutionary histories of the two domains during the Rodinia and Pangaea supercontinent cycles and thus supports a dynamic relationship between plate tectonics and deep-mantle structures. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	continental margin; geochemistry; isotopic composition; lower mantle; ocean island basalt; plate tectonics; S-wave; wave velocity
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206763
作者单位	Earth Dynamics Research Group, TIGeR, School of Earth and Planetary Sciences, Curtin University, Perth, WA, Australia; Geology Department, Faculty of Science, Tanta University, Tanta, Egypt; Department of Earth Sciences, St. Francis Xavier University, Antigonish, NS, Canada; Laboratoire G-Time, Université Libre de Bruxelles, ULB, Brussels, Belgium; Timescales of Mineral Systems, Centre for Exploration Targeting—Curtin Node, Curtin University, Perth, WA, Australia; John de Laeter Centre, Curtin University, Perth, WA, Australia; Department of Geological Sciences and Geological Engineering, Queen’s University, Kingston, Kingston, ON, Canada; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Doucet L.S.,Li Z.-X.,Gamal El Dien H.,et al. Distinct formation history for deep-mantle domains reflected in geochemical differences[J],2020,13(7).
APA	Doucet L.S..,Li Z.-X..,Gamal El Dien H..,Pourteau A..,Murphy J.B..,...&Mitchell R.N..(2020).Distinct formation history for deep-mantle domains reflected in geochemical differences.Nature Geoscience,13(7).
MLA	Doucet L.S.,et al."Distinct formation history for deep-mantle domains reflected in geochemical differences".Nature Geoscience 13.7(2020).