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Dehydration-induced damage and deformation in gypsum and implications for subduction zone processes

Brantut, N; Schubnel, Alexandre; David, Emmanuel; Heripre, E; Gueguen, Yves; Dimanov, A


Experimental heating tests were performed on Volterra gypsum to study the micromechanical consequences of the dehydration reaction. The experimental conditions were drained at 5 MPa fluid pressure and confining pressures ranging from 15 to 55 MPa. One test was performed with a constantly applied differential stress of 30 MPa. The reaction is marked by (1) a porosity increase and homogeneous compaction, (2) a swarm of acoustic emissions, (3) a large decrease in P and S wave velocities, and (4) a...[Show more]

CollectionsANU Research Publications
Date published: 2012
Type: Journal article
Source: Journal of Geophysical Research
DOI: 10.1029/2011JB008730


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