Articles | Volume 9, issue 5
Research article
27 Sep 2018
Research article |  | 27 Sep 2018

Multiscale porosity changes along the pro- and retrograde deformation path: an example from Alpine slates

Ismay Vénice Akker, Josef Kaufmann, Guillaume Desbois, Jop Klaver, Janos L. Urai, Alfons Berger, and Marco Herwegh

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Cited articles

Anovitz, L. M. and Cole, D. R.: Characterization and analysis of porosity and pore structures, Rev. Mineral Geochem., 80, 61–164, 2015.
Badertscher, N. P., Beaudoin, G., Therrien, R., and Burkhard, M.: Glarus overthrust: A major pathway for the escape of fluids out of the Alpine orogen, Geology, 30, 875–878, 2002.
Bisig, W. K.: Blattengratflysch und Sardonaflysch im Sernftal nördlich der Linie Richetlipass–Elm–Ramintal–Grosse Scheibe, PhD Thesis Nr. 2435, ETH Zürich, Switzerland, 239 pp., 1957.
Blümling, P., Bernier, F., Lebon, P., & Martin, C. D.: The excavation damaged zone in clay formations time-dependent behaviour and influence on performance assessment, Phys. Chem. Earth, 32, 588–599, 2007.
Boisson, J. Y.: Clay Club Catalogue of Characteristics of Argillaceous Rocks, OECD/NEA/RWMC/IGSC (Working Group on measurement and Physical understanding of Groundwater flow through argillaceous media) august 2005 Report NEA no. 4436 (Brochure and CD-Rom including data base), OECD/NEA, Paris, France, p. 72, 2005.
Short summary
We studied porosity changes of slates from eastern Switzerland, which were deposited in an ocean in front of the emerging Alps during the Cenozoic. The Alpine collision between the European and African plates brought the rocks from this basin to today’s position in the Alps. From the basin to the surface, the porosity first decreased down to a small number of round cavities (<1 vol%) to microfractures, and once at the surface, the porosity increased again due to the formation of macro-fractures.