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<title lang=en>Plate interface rheological switches during subduction infancy: Control on slab penetration and metamorphic sole formation</title>
<creator>Agard, Philippe</creator>
<creator>Yamato, Philippe</creator>
<creator>Soret, Mathieu</creator>
<creator>Prigent, Christophe</creator>
<creator>Guillot, S.</creator>
<creator>Plunder, Alexis</creator>
<creator>Dubacq, Benoît</creator>
<creator>Chauvet, A.</creator>
<creator>Monié, P.</creator>
<contributor>Institut des Sciences de la Terre de Paris (iSTeP) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institut Universitaire de France (IUF) ; Ministère de l'Éducation nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.)</contributor>
<contributor>Géosciences Rennes (GR) ; Université de Rennes 1 (UR1) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire des Sciences de l'Univers de Rennes (OSUR) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institut des Sciences de la Terre (ISTerre) ; Université Joseph Fourier - Grenoble 1 (UJF) - Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR) - Institut national des sciences de l'Univers (INSU - CNRS) - Institut de recherche pour le développement [IRD] : UR219 - PRES Université de Grenoble - Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]) - Centre National de la Recherche Scientifique (CNRS)</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>
<description>International audience</description>
<source>ISSN: 0012-821X</source>
<source>Earth and Planetary Science Letters</source>
<publisher>Elsevier</publisher>
<identifier>hal-01383368</identifier>
<identifier>http://hal.upmc.fr/hal-01383368</identifier>
<identifier>http://hal.upmc.fr/hal-01383368/document</identifier>
<identifier>http://hal.upmc.fr/hal-01383368/file/Agard_2016_Plate_interface.pdf</identifier>
<source>http://hal.upmc.fr/hal-01383368</source>
<source>Earth and Planetary Science Letters, Elsevier, 2016, 451, pp.208 - 220. 〈10.1016/j.epsl.2016.06.054〉</source>
<identifier>DOI : 10.1016/j.epsl.2016.06.054</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2016.06.054</relation>
<language>en</language>
<subject lang=en>metamorphic sole</subject>
<subject lang=en>subduction</subject>
<subject lang=en>slab dehydration</subject>
<subject lang=en>mechanical coupling</subject>
<subject lang=en>rheology</subject>
<subject lang=en>plate interface</subject>
<subject>[SDE] Environmental Sciences</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Subduction infancy corresponds to the first few million years following subduction initiation, when slabs start their descent into the mantle. It coincides with the transient (yet systematic) transfer of material from the top of the slab to the upper plate, as witnessed by metamorphic soles welded beneath obducted ophiolites. Combining structure–lithology–pressure–temperature–time data from metamorphic soles with flow laws derived from experimental rock mechanics, this study highlights two main successive rheological switches across the subduction interface (mantle wedge vs. basalts, then mantle wedge vs. sediments; at ∼800 °C and ∼600 °C, respectively), during which interplate mechanical coupling is maximized by the existence of transiently similar rheologies across the plate contact. We propose that these rheological switches hinder slab penetration and are responsible for slicing the top of the slab and welding crustal pieces (high- then low-temperature metamorphic soles) to the base of the mantle wedge during subduction infancy. This mechanism has implications for the rheological properties of the crust and mantle (and for transient episodes of accretion/exhumation of HP-LT rocks in mature subduction systems) and highlights the role of fluids in enabling subduction to overcome the early resistance to slab penetration.</description>
<date>2016</date>
</dc>
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