Rheological controls on the terrestrial core formation mechanism

Publication type:
Journal article
Metadata:
Autoren
  • GJ Golabek
  • TV Gerya
  • BJP Kaus
  • R Ziethe
  • PJ Tackley
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000271847700001&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.1029/2009GC002552
Externe Identifier
  • Clarivate Analytics Document Solution ID: 520MD
ISSN
1525-2027
Zeitschrift
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
Schlüsselwörter
  • core formation
  • rheology
  • collective diapirism
  • fragmentation
Artikelnummer
ARTN Q11007
Datum der Veröffentlichung
2009
Status
Published
Titel
Rheological controls on the terrestrial core formation mechanism
Sub types
  • Article
Ausgabe der Zeitschrift
10

Data source: Web of Science (Lite)

Other metadata sources:
Abstract
<jats:p>Iron core differentiation of terrestrial planetary bodies is thought to have occurred simultaneously with planetary accretion. The exact mechanisms of core formation, however, remain incompletely understood. One model proposes that cores are formed from numerous smaller iron cores from predifferentiated planetesimals. To further understand this mechanism for forming Mars‐ and Earth‐sized bodies, we present here systematic numerical simulations. Our models include a non‐Newtonian temperature‐, pressure‐ and strain rate–dependent viscoplastic rheology. Four different core formation regimes are being observed in the study, as a function of activation volume, friction angle, Peierls stress, and the initial temperature state of the body. We derive scaling laws, which show the importance of shear heating localization and plastic yielding as mechanisms to drive planetary differentiation in planetary interiors, that are in good agreement with numerical simulations. Results indicate that the effective rheology of the planetary body has a major effect on the core formation mechanism: while bodies with a weak rheology generally show a diapiric mode of core formation, the interior of planetary bodies with a stiff rheology can be fractured or displaced toward the surface. On Earth‐sized protoplanets, the water content seems also to have a significant influence on the mode of core formation. Results indicate a time scale of differentiation of a few million years, significantly shorter than expected from the Stokes sinking time in a Newtonian medium.</jats:p>
Autoren
  • GJ Golabek
  • TV Gerya
  • BJP Kaus
  • R Ziethe
  • PJ Tackley
DOI
10.1029/2009gc002552
eISSN
1525-2027
ISSN
1525-2027
Ausgabe der Veröffentlichung
11
Zeitschrift
Geochemistry, Geophysics, Geosystems
Sprache
en
Online publication date
2009
Datum der Veröffentlichung
2009
Status
Published
Herausgeber
American Geophysical Union (AGU)
Herausgeber URL
http://dx.doi.org/10.1029/2009gc002552
Datum der Datenerfassung
2024
Titel
Rheological controls on the terrestrial core formation mechanism
Ausgabe der Zeitschrift
10

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