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Dissolution-precipitation-driven upward migration of a salt crust.
G Licsandru1,2, C Noiriel1, P Duru2
1Géosciences Environnement Toulouse (GET), Observatoire Midi Pyrénées, Université de Toulouse, CNRS, IRD, France.
Physical Review. E
|October 24, 2019
Summary
Salt crusts on porous media can move upwards, forming domes or blisters. This study shows that dissolution-precipitation phenomena, not crystallization pressure, drive these salt crust displacements, matching experimental data.
Area of Science:
- Geosciences
- Materials Science
- Physical Chemistry
Background:
- Salt crusts form on porous media surfaces.
- Crust displacements lead to surface deformations like domes and blisters.
- Mechanisms for these displacements, such as crystallization pressure, are debated.
Purpose of the Study:
- To investigate the mechanisms behind salt crust upward migration.
- To determine if dissolution-precipitation phenomena can explain observed displacements.
- To develop and validate a model for crust displacement.
Main Methods:
- Conducting a simple experiment with significant salt crust migration.
- Analyzing the role of dissolution-precipitation processes.
- Deriving mathematical equations to model crust displacement.
Main Results:
- Observed significant upward migration of salt crusts.
- Demonstrated that dissolution-precipitation phenomena fully explain the migration.
- Derived equations that closely match experimental observations.
Conclusions:
- Dissolution-precipitation is the primary mechanism driving salt crust upward migration.
- The derived equations accurately predict crust displacement.
- This finding clarifies a key aspect of salt crust dynamics in porous media.
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