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The influence of post-perovskite strength on the Earth's mantle thermal and chemical evolution.

Samuel, H. und Tosi, N. (2012) The influence of post-perovskite strength on the Earth's mantle thermal and chemical evolution. Earth and Planetary Science Letters, 323-324, Seiten 50-59. DOI: 10.1016/j.epsl.2012.01.024.

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Offizielle URL: http://www.sciencedirect.com/science/article/pii/S0012821X12000428

Kurzfassung

We have investigated the influence of post-perovskite (ppv) viscosity on mantle convective dynamics and stirring efficiency, using numerical modeling and simple analytical theory. Our results show that the strength of ppv has a dramatic influence on convective dynamics. The presence of a weak ppv enhances heat transfer across the bottom thermal boundary layer, resulting in higher temperatures, lower mantle viscosities and considerably larger convective velocities. This leads to a significant increase in stirring efficiencies with decreasing the ppv strength, by at least one order of magnitude. In addition, using a simple parameterized convection evolution that includes the influence of ppv, coupled to a mixing model, we show that during the long term history of the Earth's mantle, the presence of ppv yields systematically hotter thermal evolution and more efficient convective stirring. Such a strong effect of ppv strength on mantle stirring efficiency suggests that the influence of ppv phase must be considered when interpreting both geochemical and geophysical observations. ------------------------------------------------------------------------ Highlights: 1) We study the influence of ppv strength on mantle convective mixing. 2) Weaker ppv yields higher temperatures and convective velocities. 3) We derived scalings for stirring and convective heat transfer with ppv. 4) Weak ppv can increase stirring efficiency by at least a factor 10. 5) ppv must be taken into account for interpreting surface observations.

Dokumentart:Zeitschriftenbeitrag
Titel:The influence of post-perovskite strength on the Earth's mantle thermal and chemical evolution.
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Samuel, H.Bayreuth University, Bayerisches Geoinstitut, Bayreuth, Germany
Tosi, N.nicola.tosi@dlr.de
Datum:2012
Erschienen in:Earth and Planetary Science Letters
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:323-324
DOI :10.1016/j.epsl.2012.01.024
Seitenbereich:Seiten 50-59
Status:veröffentlicht
Stichwörter:convective stirring; post-perovskite phase change; mantle heterogeneity; thermal evolution
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Exploration des Sonnensystems (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Planetenphysik
Institut für Planetenforschung
Hinterlegt von: Lena Noack
Hinterlegt am:27 Jun 2012 14:43
Letzte Änderung:07 Feb 2013 20:07

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