Répartition bimodale des produits solides d'une chambre magmatique

modélisation par cristallisation fractionnée avec couplage des échanges chimiques et du transport différentiel magma/solide

Translated title of the contribution: Bimodal distribution of the solid products in a magmatic chamber: Modelling by fractional crystallization and coupling of the chemical exchanges with the differential melt/solid transport

Morad Lakhssassi, Bernard Guy*, Eric Touboul, Jean Yves Cottin

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Our aim is to explain the possible bimodality of the compositions of the magmatic rocks of the same province. In order to do so, we present a model for the crystallization of a magmatic chamber, coupling the three phenomena: solidification, sedimentation, chemical reactions between the solid and the liquid. These three phenomena make two independent dimensionless parameters appear: the ratios of the solidification rate to the transport velocity, and of the chemical kinetics to the transport velocity. The model is written for one independent chemical component. It is shown that, for certain values of the dimensionless parameters, the chemical composition of the chamber can present a bimodal distribution, starting from uniform initial conditions. This model shows that the coupling between three elementary phenomena is enough to explain the bimodality, or more generally the appearance of discontinuities of chemical compositions, without making any additional assumption.

Original languageFrench
Pages (from-to)701-709
Number of pages9
JournalComptes Rendus - Geoscience
Volume342
Issue number9
DOIs
Publication statusPublished - Sep 2010
Externally publishedYes

Keywords

  • Bimodal distribution
  • Chemical exchange
  • Discontinuity of composition
  • Fractional crystallization
  • Magmatic chamber
  • Sedimentation
  • Solidification

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