globalchange  > 气候变化与战略
DOI: 10.1038/s41561-020-0599-9
论文题名:
Distinct formation history for deep-mantle domains reflected in geochemical differences
作者: 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.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期:7
起始页码: 511
结束页码: 515
语种: 英语
英文关键词: continental margin ; geochemistry ; isotopic composition ; lower mantle ; ocean island basalt ; plate tectonics ; S-wave ; wave velocity
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169579
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Doucet L.S.,Li Z.-X.,Gamal El Dien H.,et al. Distinct formation history for deep-mantle domains reflected in geochemical differences[J]. Nature Geoscience,2020-01-01,13(7)
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