Barraud, J., Gardien, V., Allemand, P. and Grandjean, P. 2001. Strain-dependence of the melt migration in partially molten crustal rocks. In: Ailleres, L. and Rawling, T. 2001. Animations in Geology. Journal of the Virtual Explorer, 4.

Strain-dependence of the melt migration in partially molten crustal rocks.

Joseph Barraud, Véronique Gardien, Pascal Allemand, Philippe Grandjean

Laboratoire Dynamique de la Lithosphere, UCB-ENS Lyon, France.


Abstract
Progressive horizontal shortening of a partially molten layer of microcrystalline paraffin wax is shown under the form of a movie. During the folding, the melt segregates into foliation-parallel veins. The distribution of the melt becomes heterogeneous and varies at each increment of deformation because veins may subsequently disappeared. A dilatancy-pumping mechanism is clearly observable. It allows the pervasive horizontal migration of the melt from the layer to the outside of the layer. The melt extraction occurs by pulses in a periodic manner.


 

Index:

Introduction

Analog materials and scaling of the experiment

Description of the movie

Discussion and conclusion

Acknowledgements

References