HAL : hal-00701975, version 1

DOI : 10.1016/j.epsl.2012.04.046

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Earth and Planetary Science Letters 341-343 (2012) 104-113

Modelling of stylolite geometries and stress scaling

Daniel Koehn 1, Marcus Ebner 2, Francois Renard 3, 4, Renaud Toussaint 5, 6, C. W. Passchier 7

(01/08/2012)

In this contribution we present numerical simulations of stylolite growth to decipher the effects of initial rock heterogeneity and stress on their morphology. We show that stylolite growth in a rock with a uniform grain size produces different patterns than stylolite growth in a rock with a bimodal grain size distribution. Strong pinning of large heterogeneities produce stylolite structures that are dominated by pronounced teeth, whereas a uniform grain size leads to spikes and a roughness that shows variable wavelengths. We compare the simulated stylolites with natural examples and show that the model can reproduce the real structures. In addition we show that strong pinning in the bimodal case can lead to a linear stylolite roughness growth in contrast to the non-linear growth of stylolites that develop from a uniform noise. In a set of 24 simulations we vary the main principle stress on the stylolite in order to test if our model can reproduce the analytically derived stress-scaling proposed by Schmittbuhl et al. (2004). We compare the calculated stresses with the applied stresses and show that the numerical model and the analytical solution are in good agreement. Our results strengthen the hypothesis that stylolites can be used as strain and stress gauges to estimate not only the orientation of paleo-stresses, but also their absolute values of formation stresses and amounts of compaction.

1 :	School of Geographical and Earth Sciences, University of Glasgow
	University of Glasgow
2 :	Geological Survey of Austria
	Geological Survey of Austria
3 :	Institut des sciences de la Terre (ISTerre)
	CNRS : UMR5275 – IFSTTAR – Université de Savoie – Université Joseph Fourier - Grenoble I – INSU – OSUG – Institut de recherche pour le développement [IRD] : UR219
4 :	Physics of Geological Processes (PGP)
	University of Oslo
5 :	Institut de physique du globe de Strasbourg (IPGS)
	CNRS : UMR7516 – INSU – Université de Strasbourg
6 :	Centre for Advanced Study at the Norwegian Academy of Science and Letters
	Norwegian Academy of Science and Letters
7 :	Tectonophysics
	University of Mainz

Équipe de recherche : GE

Domaine

:

Planète et Univers/Sciences de la Terre Physique/Mécanique/Mécanique des matériaux Sciences de l'ingénieur/Mécanique/Mécanique des matériaux Planète et Univers/Sciences de la Terre/Géophysique Sciences de l'environnement/Milieux et Changements globaux Physique/Physique/Géophysique Planète et Univers/Sciences de la Terre/Minéralogie

Mots Clés : stylolite – stress-gauge – compaction – pressure solution – numerical model – self-affinity

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Contributeur : Renaud Toussaint <>

Soumis le : Lundi 28 Mai 2012, 17:52:52

Dernière modification le : Jeudi 23 Août 2012, 11:53:02