Formation of bridgmanite-enriched layer at the top lower-mantle during magma ocean solidification.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
28 Jan 2020
28 Jan 2020
Historique:
received:
04
05
2019
accepted:
10
12
2019
entrez:
30
1
2020
pubmed:
30
1
2020
medline:
30
1
2020
Statut:
epublish
Résumé
Thermochemical heterogeneities detected today in the Earth's mantle could arise from ongoing partial melting in different mantle regions. A major open question, however, is the level of chemical stratification inherited from an early magma-ocean (MO) solidification. Here we show that the MO crystallized homogeneously in the deep mantle, but with chemical fractionation at depths around 1000 km and in the upper mantle. Our arguments are based on accurate measurements of the viscosity of melts with forsterite, enstatite and diopside compositions up to ~30 GPa and more than 3000 K at synchrotron X-ray facilities. Fractional solidification would induce the formation of a bridgmanite-enriched layer at ~1000 km depth. This layer may have resisted to mantle mixing by convection and cause the reported viscosity peak and anomalous dynamic impedance. On the other hand, fractional solidification in the upper mantle would have favored the formation of the first crust.
Identifiants
pubmed: 31992697
doi: 10.1038/s41467-019-14071-8
pii: 10.1038/s41467-019-14071-8
pmc: PMC6987212
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
548Subventions
Organisme : MEXT | Japan Society for the Promotion of Science (JSPS)
ID : DC2-JP17J10966
Organisme : MEXT | Japan Society for the Promotion of Science (JSPS)
ID : 22224008
Organisme : MEXT | Japan Society for the Promotion of Science (JSPS)
ID : 15H02128
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