气候变化领域集成服务门户(CCPortal): Long-lived Paleoproterozoic eclogitic lower crust

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DOI	10.1038/s41467-021-26878-5
	Long-lived Paleoproterozoic eclogitic lower crust
	Buntin S.; Artemieva I.M.; Malehmir A.; Thybo H.; Malinowski M.; Högdahl K.; Janik T.; Buske S.
发表日期	2021
卷号	12 期号:1
英文摘要	The nature of the lower crust and the crust-mantle transition is fundamental to Earth sciences. Transformation of lower crustal rocks into eclogite facies is usually expected to result in lower crustal delamination. Here we provide compelling evidence for long-lasting presence of lower crustal eclogite below the seismic Moho. Our new wide-angle seismic data from the Paleoproterozoic Fennoscandian Shield identify a 6–8 km thick body with extremely high velocity (Vp ~ 8.5–8.6 km/s) and high density (>3.4 g/cm3) immediately beneath equally thinned high-velocity (Vp ~ 7.3–7.4 km/s) lowermost crust, which extends over >350 km distance. We relate this observed structure to partial (50–70%) transformation of part of the mafic lowermost crustal layer into eclogite facies during Paleoproterozoic orogeny without later delamination. Our findings challenge conventional models for the role of lower crustal eclogitization and delamination in lithosphere evolution and for the long-term stability of cratonic crust. © 2021, The Author(s).
语种	英语
scopus关键词	crustal contamination; crustal deformation; detection method; eclogite; lithosphere; lower crust; Proterozoic; seismic data; article; lithosphere; Paleoproterozoic; Baltic Shield
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/251548
作者单位	Department of Earth Sciences, Uppsala University, Uppsala, Sweden; Department of Geophysics, Stanford University, Stanford, CA, United States; Marine Geodynamics Section, GEOMAR Helmholtz Center for Ocean Research, Kiel, Germany; School of Earth Sciences, China University of Geosciences, Wuhan, China; Eurasia Institute of Earth Sciences, Istanbul Technical University, Istanbul, Turkey; Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland; Technical University Bergakademie Freiberg, Freiberg, Germany
推荐引用方式 GB/T 7714	Buntin S.,Artemieva I.M.,Malehmir A.,et al. Long-lived Paleoproterozoic eclogitic lower crust[J],2021,12(1).
APA	Buntin S..,Artemieva I.M..,Malehmir A..,Thybo H..,Malinowski M..,...&Buske S..(2021).Long-lived Paleoproterozoic eclogitic lower crust.Nature Communications,12(1).
MLA	Buntin S.,et al."Long-lived Paleoproterozoic eclogitic lower crust".Nature Communications 12.1(2021).