Articles | Volume 10, issue 5
Research article
23 Oct 2019
Research article |  | 23 Oct 2019

Deformation mechanisms in mafic amphibolites and granulites: record from the Semail metamorphic sole during subduction infancy

Mathieu Soret, Philippe Agard, Benoît Ildefonse, Benoît Dubacq, Cécile Prigent, and Claudio Rosenberg

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Cited articles

Abers, G. A., Van Keken, P. E., and Hacker, B. R.: The cold and relatively dry nature of mantle forearcs in subduction zones, Nat. Geosci., 5, 333–337, 2017. 
Agard, P., Yamato, P., Soret, M., Prigent, C., Guillot, S., Plunder, A., Chauvet, A., and Monié, P.: Plate interface rheological switches during subduction infancy: control on slab penetration and metamorphic sole formation, Earth Planet. Sc. Lett., 451, 208–220, 2016. 
Agard, P., Plunder, A., Angiboust, S., Bonnet, G., and Ruh, J.: The subduction plate interface: Rock record and mechanical coupling (from long to short time scales), Lithos, 320/321, 537–566,, 2018. 
Ambrose, T. K., Wallis, D., Hansen, L. N., Waters, D. J., and Searle, M. P.: Controls on the rheological properties of peridotite at a palaeosubduction interface: A transect across the base of the Oman–UAE ophiolite, Earth Planet. Sc. Lett., 491, 193–206,, 2018. 
Bachmann, F., Hielscher, R., and Schaeben, H.: Texture Analysis with MTEX – Free and Open Source Software Toolbox, Sol. St. Phen., 160, 63–68, 2010. 
Short summary
This study sheds light on the mineral-scale mechanisms controlling the progressive deformation of sheared amphibolites from the Oman metamorphic sole during subduction initiation and unravels how strain is localized and accommodated in hydrated mafic rocks at high temperature conditions. Our results indicate how metamorphic reactions and pore-fluid pressures driven by changes in pressure–temperature conditions and/or water activity control the rheology of mafic rocks.