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<title lang=en>Phyllosilicates formation in faults rocks: Implications for dormant fault-sealing potential and fault strength in the upper crust</title>
<creator>CAVAILHES, Thibault</creator>
<creator>Soliva, Roger</creator>
<creator>Labaume, Pierre</creator>
<creator>Wibberley, Christopher</creator>
<creator>Sizun, Jean-Pierre</creator>
<creator>Gout, Claude</creator>
<creator>Charpentier, Delphine</creator>
<creator>Chauvet, Alain</creator>
<creator>Scalabrino, Bruno</creator>
<creator>Buatier, Martine</creator>
<contributor>Bassins ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Bass ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>TOTAL-Scientific and Technical Center Jean Féger (CSTJF) ; Total</contributor>
<contributor>Laboratoire Chrono-environnement (LCE) ; Université Bourgogne Franche-Comté (UBFC) - Centre National de la Recherche Scientifique (CNRS) - Université de Franche-Comté (UFC)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géoazur (GEOAZUR) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Université Nice Sophia Antipolis (UNS) ; Université Côte d'Azur (UCA) - Université Côte d'Azur (UCA) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire de la Côte d'Azur - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0094-8276</source>
<source>EISSN: 1944-8007</source>
<source>Geophysical Research Letters</source>
<publisher>American Geophysical Union</publisher>
<identifier>hal-00903574</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00903574</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00903574</source>
<source>Geophysical Research Letters, American Geophysical Union, 2013, 40 (16), pp.4272-4278. 〈10.1002/grl.50829〉</source>
<identifier>DOI : 10.1002/grl.50829</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1002/grl.50829</relation>
<language>en</language>
<subject lang=en>micas</subject>
<subject lang=en>Shale Gouge</subject>
<subject lang=en>strength</subject>
<subject lang=en>diagenesis</subject>
<subject lang=en>permeability</subject>
<subject lang=en>sandstone</subject>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Phyllosilicate content and related permeability of fault zones form primary controls on hydraulic and mechanical behavior of the brittle crust. Hence, understanding and predicting the localization of these ubiquitous minerals is a major issue for fundamental and applied geosciences. We describe normal fault zones cutting a foreland arkosic turbiditic formation suffering high-T diagenesis and formed under conditions (~200°C) typical of deeply buried reservoirs and common within the seismogenic interval. Microstructural analyses show a large proportion of phyllosilicates (up to 34%) in the fault rock, derived from near-complete feldspar alteration and disaggregation during deformation. This study shows that even faults with offsets (~20 cm) much lower than bed thickness can have such large feldspar-to-phyllosilicate transformation ratios, implying that the origin of the phyllosilicates is purely transformation related. These results imply that the potential sealing capacity and strength of faults could be predicted from the host rock feldspar content. Where sealing capacity and fault strength can be related to phyllosilicate content, these properties can then also be inferred from the predicted phyllosilicate content: this opens up new horizons concerning the hydraulic and the mechanical behavior of the upper crust.</description>
<date>2013-08-28</date>
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