DOI: 10.1038/s41561-017-0053-9
论文题名: Deep and persistent melt layer in the Archaean mantle
作者: Andrault D. ; Pesce G. ; Manthilake G. ; Monteux J. ; Bolfan-Casanova N. ; Chantel J. ; Novella D. ; Guignot N. ; King A. ; Itié J.-P. ; Hennet L.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2018
卷: 11, 期: 2 起始页码: 139
结束页码: 143
语种: 英语
Scopus关键词: Archean
; cooling
; early Earth
; instability
; partial melting
; plate tectonics
; Proterozoic
; slab
; subduction
; upper mantle
; viscosity
英文摘要: The transition from the Archaean to the Proterozoic eon ended a period of great instability at the Earth's surface. The origin of this transition could be a change in the dynamic regime of the Earth's interior. Here we use laboratory experiments to investigate the solidus of samples representative of the Archaean upper mantle. Our two complementary in situ measurements of the melting curve reveal a solidus that is 200-250 K lower than previously reported at depths higher than about 100 km. Such a lower solidus temperature makes partial melting today easier than previously thought, particularly in the presence of volatiles (H2O and CO2). A lower solidus could also account for the early high production of melts such as komatiites. For an Archaean mantle that was 200-300 K hotter than today, significant melting is expected at depths from 100-150 km to more than 400 km. Thus, a persistent layer of melt may have existed in the Archaean upper mantle. This shell of molten material may have progressively disappeared because of secular cooling of the mantle. Crystallization would have increased the upper mantle viscosity and could have enhanced mechanical coupling between the lithosphere and the asthenosphere. Such a change might explain the transition from surface dynamics dominated by a stagnant lid on the early Earth to modern-like plate tectonics with deep slab subduction. © 2018 The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105607
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Université Clermont Auvergne, CNRS, IRD, OPGC, Laboratorie Magmas et Volcans, Clermont-Ferrand, France; Synchrotron SOLEIL, Gif-sur-Yvette, France; Conditions Extrêmes et Matériaux: Haute Température et Irradiation, CNRS, Orléans, France; School of Geosciences, University of Edinburgh, Edinburgh, United Kingdom
Recommended Citation:
Andrault D.,Pesce G.,Manthilake G.,et al. Deep and persistent melt layer in the Archaean mantle[J]. Nature Geoscience,2018-01-01,11(2)