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Geological Society, London, Special Publications; 1990; v. 54; p. 193-199;
DOI: 10.1144/GSL.SP.1990.054.01.19
© 1990 Geological Society of London

Instabilities and Localization

Propagation and localization of stylolites in limestones

E. Carrio-Schaffhauser1, S. Raynaud2, H. J. Latière3 & F. Mazerolle3

1 LGIT, IRIGM, BP53X, 38041 Grenoble Cedex, France
2 Laboratoire de Géologie Structurale et Appliquée, Université de Provence 13331 Marseille Cedex 3 France
3 Laboratoire de Mécanique et d’Acoustique, CNRS, BP71, 13277 Marseille Cedex 9 France

Matrix investigations (X-Ray tomography, porosimetry by mercury injection, SEM analysis) around stylolites revealed major zones that represent different states in the propagation of the pressure solution structure.

Near the stylolite termination, a significant increase of porosity relative to the far-field host rock porosity and variations in the shape of matrix particles are associated with the lateral propagation of the dissolution zone in the plane of the seam. Close to the sides of the seam, this porosity enhancement zone is found again and may be responsible for vertical development of the stylolite style. Above and below the stylolite seam, the rock matrix is less porous than the reference state and this region appears to have been a site of precipitation of diffused solute. These observations imply that the enhanced porosity state around the stylolite tip is a transient one. This zone becomes a site of deposition as the stylolite tip propagates through it.





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[Abstract] [PDF]