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<identifier>oai:HAL:hal-00411724v1</identifier>
<datestamp>2018-01-11</datestamp>
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<metadata><dc>
<publisher>HAL CCSD</publisher>
<title lang=en>Feedback between melt percolation and deformation in an exhumed lithosphere-asthenosphere boundary</title>
<creator>Le Roux, Véronique</creator>
<creator>Tommasi, Andrea</creator>
<creator>Vauchez, Alain</creator>
<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-00411724</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00411724</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00411724</source>
<source>Earth and Planetary Science Letters, Elsevier, 2008, 274 (3-4), pp.401-413. 〈10.1016/j.epsl.2008.07.053〉</source>
<identifier>DOI : 10.1016/j.epsl.2008.07.053</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2008.07.053</relation>
<language>en</language>
<subject lang=en>melt percolation</subject>
<subject lang=en>strain localization</subject>
<subject lang=en>mantle lithosphere</subject>
<subject lang=en>olivine</subject>
<subject lang=en>pyroxene</subject>
<subject lang=en>crystal-preferred orientation</subject>
<subject lang=en>dislocation creep</subject>
<subject lang=en>diffusion</subject>
<subject lang=en>refertilization reactions</subject>
<subject lang=en>lherzolites</subject>
<subject lang=en>websterites</subject>
<subject lang=en>harzburgites</subject>
<subject lang=en>melt segregation</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>Interactions between deformation and melt percolation yield important consequences for the evolution of the mantle lithosphere, controlling its composition and mechanical behavior. In the Lherz massif (Pyrenees, France), the analysis of structural relationships between harzburgites, lherzolites and pyroxenites and of the crystal-preferred orientations (CPO) of olivine and pyroxenes highlights a strong feedback between percolation of basaltic melts and deformation under near-solidus conditions at the lithosphere–asthenosphere boundary. Elongated harzburgite bodies up to tens of meters wide, which are the remnants of an old lithospheric mantle, preserve a constant foliation. This foliation is locally outlined by cm-scale flattened websteritic lenses. At the contact with the enclosing lherzolites, the harzburgite foliation is crosscut by the lherzolites foliation and by cm-wide websterite bands parallel to the contact. Strain intensity in the lherzolites increases with distance to the harzburgites. Based on these observations, we propose that reactive percolation was synchronous to the deformation and propose that variations in instantaneous melt fraction, due to pyroxenes and spinel crystallization during reactive melt transport, guided strain localization. Accordingly, the observed decrease in olivine CPO intensity and change in CPO patterns from harzburgites to distal lherzolites are interpreted as recording changes in the relative contribution of dislocation glide and diffusion processes, which is ruled by a balance between the instantaneous melt fraction and the local strain rate. We also propose that the pervasive websteritic layering in the refertilized lherzolites may result from deformation-assisted melt segregation in a system with decreasing permeability due to refertilization reactions. Finally, we discuss the possible timing and geodynamical context of the refertilization episode.</description>
<date>2008</date>
</dc>
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