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<title lang=en>Plastic deformation and development of antigorite crystal preferred orientation in high-pressure serpentinites</title>
<creator>Padron-Navarta, Jose Alberto</creator>
<creator>TOMMASI, Andréa</creator>
<creator>Garrido, Carlos J.</creator>
<creator>Lopez Sanchez-Vizcaino, Vicente</creator>
<contributor>Manteau et Interfaces ; 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>Instituto Andaluz de Ciencias de la Tierra (IACT) ; Universidad de Granada (UGR) - Consejo Superior de Investigaciones Científicas [Spain] (CSIC)</contributor>
<contributor>Universidad de Jaén (UJA)</contributor>
<description>International audience</description>
<source>ISSN: 0012-821X</source>
<source>Earth and Planetary Science Letters</source>
<publisher>Elsevier</publisher>
<identifier>hal-00795511</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00795511</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00795511</source>
<source>Earth and Planetary Science Letters, Elsevier, 2012, 349, pp.75-86. 〈10.1016/j.epsl.2012.06.049〉</source>
<identifier>DOI : 10.1016/j.epsl.2012.06.049</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2012.06.049</relation>
<language>en</language>
<subject lang=en>ductile deformation</subject>
<subject lang=en>antigorite</subject>
<subject lang=en>EBSD</subject>
<subject lang=en>modelling</subject>
<subject lang=en>anisotropy</subject>
<subject lang=en>subduction</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>We have inferred the deformation mechanisms of antigorite by high-resolution EBSD mapping of samples from Cerro del Almirez ultramafic massif (Betic Cordillera, SE Spain). Textural relations and phase diagram calculations constrain the foliation development conditions to the subduction prograde path at up to 600-630 °C and 1.6-1.9 GPa. Deformation was followed by static annealing of antigorite at ca. 680 °C. The Crystal Preferred Orientation (CPO) of antigorite is characterised by a strong alignment of (001) poles normal to the foliation plane and a weaker, but clear, parallelism between [100] axes and the macroscopic lineation defined by the elongation of magnetite aggregates. Analysis of misorientations across subgrains shows predominance of [010] rotation axis, consistent with activation of the [100](001) slip system. However, tilt subgrain boundaries subparallel to (100), probably formed by edge dislocations of this system, are subsidiary. Most subgrain boundaries are subparallel to (001) planes. They are interpreted as (001) twins wherein continuing viscoplastic deformation resulted in a slight increase of the misorientation between the twins. Modelling of the evolution of the antigorite CPO using a lower bound approach and considering different deformation regimes and sets of basal and non-basal slip systems has shown that intensities of [100] and [010] maxima reflect the relative strength of the antigorite [100](001) and [010](001) systems. Activation of other basal or non-basal slip systems does not change significantly the CPO patterns, but results in less concentrated CPO. 3D transpression models better reproduce the CPO of natural antigorite serpentinites. We propose that the widespread occurrence of strong CPO in high-pressure antigorite serpentinite is consistent with deformation by dislocation creep with dominant glide on [hk0](001), together with the activation of twinning, implying that a power law rheology would better account for the mechanical behaviour of antigorite serpentinite deep in the subduction channel and mantle wedge.</description>
<date>2012-10-01</date>
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