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<title lang=en>Formation of chlorite during thrust fault reactivation. Record of fluid origin and P-T conditions in the Monte Perdido thrust fault (southern Pyrenees)</title>
<creator>Lacroix, B.</creator>
<creator>Charpentier, D.</creator>
<creator>Buatier, M.</creator>
<creator>Vennemann, T.</creator>
<creator>Labaume, Pierre</creator>
<creator>Adatte, T.</creator>
<creator>Trave, A.</creator>
<creator>Dubois, M.</creator>
<contributor>Laboratoire Chrono-environnement (LCE) ; Université Bourgogne Franche-Comté (UBFC) - Centre National de la Recherche Scientifique (CNRS) - Université de Franche-Comté (UFC)</contributor>
<contributor>Institut de Minéralogie et Géochimie, Université de Lausanne ; Université du Québec</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>Departament de Geoquímica, Petrologia i Prospecció Geològica, Universitat de Barcelona ; Université du Québec</contributor>
<contributor>Processus et bilan des domaines sédimentaires (PBDS) ; Université de Lille, Sciences et Technologies - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0010-7999</source>
<source>EISSN: 1432-0967</source>
<source>Contributions to Mineralogy and Petrology</source>
<publisher>Springer Verlag</publisher>
<identifier>hal-00757736</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00757736</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00757736</source>
<source>Contributions to Mineralogy and Petrology, Springer Verlag, 2012, 163 (6), pp.1083-1102. 〈10.1007/s00410-011-0718-0〉</source>
<identifier>DOI : 10.1007/s00410-011-0718-0</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1007/s00410-011-0718-0</relation>
<language>en</language>
<subject lang=en>Clay minerals</subject>
<subject lang=en>Thrust fault</subject>
<subject lang=en>hermometer</subject>
<subject lang=en>Stable isotope</subject>
<subject lang=en>Veins</subject>
<subject lang=en>P-T conditions</subject>
<subject>[SDU.STU.PE] Sciences of the Universe [physics]/Earth Sciences/Petrography</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The chemical and isotopic compositions of clay minerals such as illite and chlorite are commonly used to quantify diagenetic and low-grade metamorphic conditions, an approach that is also used in the present study of the Monte Perdido thrust fault from the South Pyrenean fold-and-thrust belt. The Monte Perdido thrust fault is a shallow thrust juxtaposing upper Cretaceous-Paleocene platform carbonates and Lower Eocene marls and turbidites from the Jaca basin. The core zone of the fault, about 6 m thick, consists of intensely deformed clay-bearing rocks bounded by major shear surfaces. Illite and chlorite are the main hydrous minerals in the fault zone. Illite is oriented along cleavage planes while chlorite formed along shear veins (<50 μm in thickness). Authigenic chlorite provides essential information about the origin of fluids and their temperature. δ18O and δD values of newly formed chlorite support equilibration with sedimentary interstitial water, directly derived from the local hanging wall and footwall during deformation. Given the absence of large-scale fluid flow, the mineralization observed in the thrust faults records the P-T conditions of thrust activity. Temperatures of chlorite formation of about 240°C are obtained via two independent methods: chlorite compositional thermometers and oxygen isotope fractionation between cogenetic chlorite and quartz. Burial depth conditions of 7 km are determined for the Monte Perdido thrust reactivation, coupling calculated temperature and fluid inclusion isochores. The present study demonstrates that both isotopic and thermodynamic methods applied to clay minerals formed in thrust fault are useful to help constrain diagenetic and low-grade metamorphic conditions.</description>
<date>2012-06</date>
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