Early magnetic field and magmatic activity on Mars from magma ocean cumulate overturn

Linda Elkins-Tanton, Sarah E. Zaranek, E. M. Parmentier, P. C. Hess

Research output: Contribution to journalArticle

82 Citations (Scopus)

Abstract

Significant and perhaps complete melting of the young terrestrial planets is expected from their heat of accretion and core formation. The process of subsequent magma ocean fractional solidification creates a cumulate mantle unstable to gravitational overturn. Overturn should be fast (≤1 to 10 Ma) and result in increasing mantle density with depth. This stable stratification inhibits later thermal convection, preserving geochemical heterogeneities. Overturn places cold cumulates against the core-mantle boundary, which creates sufficient heat flux to drive a core dynamo, producing a brief, strong magnetic field. During overturn, hot cumulates rise from depth and melt adiabatically, creating an early crust to record this field and leaving behind mantle reservoirs with isotopic fractionations dating from the early evolution of the planet.

Original languageEnglish (US)
Pages (from-to)1-12
Number of pages12
JournalEarth and Planetary Science Letters
Volume236
Issue number1-2
DOIs
StatePublished - Jul 30 2005
Externally publishedYes

Fingerprint

overturn
Planets
cumulate
mars
magma
Mars
oceans
Earth mantle
Magnetic fields
magnetic field
ocean
Fractionation
mantle
magnetic fields
Solidification
Heat flux
core-mantle boundary
Melting
terrestrial planets
planet

Keywords

  • Cumulates
  • Magma ocean
  • Magnetic field
  • Mantle heterogeneity
  • Mars

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)

Cite this

Early magnetic field and magmatic activity on Mars from magma ocean cumulate overturn. / Elkins-Tanton, Linda; Zaranek, Sarah E.; Parmentier, E. M.; Hess, P. C.

In: Earth and Planetary Science Letters, Vol. 236, No. 1-2, 30.07.2005, p. 1-12.

Research output: Contribution to journalArticle

Elkins-Tanton, Linda ; Zaranek, Sarah E. ; Parmentier, E. M. ; Hess, P. C. / Early magnetic field and magmatic activity on Mars from magma ocean cumulate overturn. In: Earth and Planetary Science Letters. 2005 ; Vol. 236, No. 1-2. pp. 1-12.
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