Stress sensitivity of stylolite morphology |
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| Authors: | Marcus Ebner Daniel Koehn Renaud Toussaint François Renard Jean Schmittbuhl |
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| Institution: | 1. Tectonophysics, Institute of Geosciences, Johannes Gutenberg University, Becherweg 21, D-55128 Mainz, Germany;2. EOST, Université Louis Pasteur, Strasbourg, France;3. Institut de Physique du Globe de Strasbourg, UMR CNRS 7516, 5 rue Descartes, F-67084 Strasbourg Cedex, France;4. LGCA-CNRS-Observatoire de Grenoble, Université Joseph Fourier BP 53, F-38041 Grenoble, France;5. Physics of Geological Processes, University of Oslo, Norway;1. Dipartimento di Geoscienze, Università degli Studi di Padova, via G. Gradenigo 6, 35131 Padova, Italy;2. ISTerre, Université J. Fourier – Grenoble I, BP 53, F-38041 Grenoble, France;3. Istituto di Geoscienze e Georisorse, CNR, via G. Moruzzi 1, 56124 Pisa, Italy;4. Istituto Nazionale di Geofisica e Vulcanologia, via di Vigna Murata 605, 00143 Roma, Italy;5. Physics of Geological Processes, University of Oslo, Norway;1. Department of Geological and Environmental Science, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel;2. Institut de physique du globe de Strasbourg, 5, rue René Descartes, F-67084 Strasbourg cedex, France;3. Geological Survey of Israel, 30 Malkhe Israel, Jerusalem 95501, Israel;2. Physics of Geological Processes, University of Oslo, Norway;3. Laboratoire Interdisciplinaire de Physique, Grenoble, France |
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| Abstract: | Stylolites are rough surfaces that form by localized stress-induced dissolution. Using a set of limestone rock samples collected at different depths from a vertical section in Cirque de Navacelles (France), we study the influence of the lithostatic stress on the stylolites morphology on the basis of a recent morphogenesis model. We measured the roughness of a series of bedding-parallel stylolites and show that their morphology exhibits a scaling invariance with two self-affine scaling regimes separated by a crossover-length (L) at the millimeter scale consistent with previous studies. The importance of the present contribution is to estimate the stylolite formation stress σ from the sample position in the stratigraphic series and compare it to the crossover-length L using the expected relationship: L ～ σ ?2. We obtained a successful prediction of the crossover behavior and reasonable absolute stress magnitude estimates using relevant parameters: depth of stylolite formation between 300 to 600 m with corresponding normal stress in the range of 10–18 MPa. Accordingly, the stylolite morphology contains a signature of the stress field during formation and we thus suggest that stylolites could be used as paleo-stress gauges of deformation processes in the upper crust. |
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