Analogue modelling of syntectonic leucosomes in migmatitic schists

Elena Druguet, Jordi Carreras

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30 Citations (Scopus)


Migmatites from the Cap de Creus tectonometamorphic belt display a wide variety of structures, from those formed when the leucosomes were melt-bearing, to those developed during solid-state deformation. The observed field structures have been modelled by means of analogue experiments. The materials used in the models are layered plasticine as a schist analogue, and chocolate as analogue of the crystallizing leucosome. A model for the development of syntectonic migmatites is proposed in which initial melt-bearing patches, preferentially formed within fertile pelitic layers, progressively evolve towards lens-shaped veins. Furthermore, heterogeneous deformation of anisotropic metasediments facilitates formation of extensional sites for further melt accumulation and transport. Melt crystallization implies a rapid increase in effective viscosity of leucosomes producing a reversal in competence contrast with respect to the enclosing schists. During the whole process, deformation localizes around crystallizing veins, giving rise to different and contrasting structures for melt-bearing and for solid-state stages. © 2006 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)1734-1747
JournalJournal of Structural Geology
Publication statusPublished - 1 Oct 2006


  • Analogue modelling
  • Deformation
  • Melt
  • Migmatite
  • Rheology


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