气候变化领域集成服务门户(CCPortal): Palaeoarchaean deep mantle heterogeneity recorded by enriched plume remnants

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DOI	10.1038/s41561-019-0410-y
	Palaeoarchaean deep mantle heterogeneity recorded by enriched plume remnants
	Wang C.; Song S.; Wei C.; Su L.; Allen M.B.; Niu Y.; Li X.-H.; Dong J.
发表日期	2019
ISSN	17520894
卷号	12 期号:8
英文摘要	The thermal and chemical state of the early Archaean deep mantle is poorly resolved due to the rare occurrences of early Archaean magnesium-rich volcanic rocks. In particular, it is not clear whether compositional heterogeneity existed in the early Archaean deep mantle and, if it did, how deep mantle heterogeneity formed. Here we present a geochronological and geochemical study on a Palaeoarchaean ultramafic–mafic suite (3.45-Gyr-old) with mantle plume signatures in Longwan, Eastern Hebei, the North China Craton. This suite consists of metamorphosed cumulates and basalts. The meta-basalts are iron rich and show the geochemical characteristics of present-day oceanic island basalt and unusually high mantle potential temperatures (1,675 °C), which suggests a deep mantle source enriched in iron and incompatible elements. The Longwan ultramafic–mafic suite is best interpreted as the remnants of a 3.45-Gyr-old enriched mantle plume. The first emergence of mantle-plume-related rocks on the Earth 3.5–3.45 billion years ago indicates that a global mantle plume event occurred with the onset of large-scale deep mantle convection in the Palaeoarchaean. Various deep mantle sources of these Palaeoarchaean mantle-plume-related rocks imply that significant compositional heterogeneity was present in the Palaeoarchaean deep mantle, most probably introduced by recycled crustal material. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	Archean; heterogeneity; mantle; mantle convection; mantle plume; mantle source; metabasalt; metamorphism; volcanic rock; China; Hebei; North China Block
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/124626
作者单位	MOE Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing, China; School of Earth Sciences and Resources, China University of Geosciences, Beijing, China; School of Scientific Research and State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, China; Department of Earth Sciences, Durham University, Durham, United Kingdom; 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	Wang C.,Song S.,Wei C.,et al. Palaeoarchaean deep mantle heterogeneity recorded by enriched plume remnants[J],2019,12(8).
APA	Wang C..,Song S..,Wei C..,Su L..,Allen M.B..,...&Dong J..(2019).Palaeoarchaean deep mantle heterogeneity recorded by enriched plume remnants.Nature Geoscience,12(8).
MLA	Wang C.,et al."Palaeoarchaean deep mantle heterogeneity recorded by enriched plume remnants".Nature Geoscience 12.8(2019).