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doi:10.5194/se-2017-11
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
07 Feb 2017
Review status
This discussion paper is under review for the journal Solid Earth (SE).
Switching deformation mode and mechanisms during subduction of continental crust: a case study from Alpine Corsica
Giancarlo Molli1, Luca Menegon2, and Alessandro Malasoma3 1Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria, 53, Pisa 56126, Italy
2School of Geography, Earth and Environmental Sciences, Plymouth University, Plymouth, UK
3TLS Lab and Geoservices, Via Vecchia Fiorentina, 10, 56023 Cascina, Pisa Italy
Abstract. The switching in deformation mode (from distributed to localized) and mechanisms (viscous versus frictional) represent a relevant issue in the frame of crustal deformation, being also connected with the concept of the brittle-ductile transition and seismogenesis. In subduction environment, switching in deformation mode and mechanisms may be inferred along the subduction interface, in a transition zone between the highly coupled (seismogenic zone) and decoupled deeper aseismic domain (stable slip). On the other hand, the role of brittle precursors in nucleating crystal-plastic shear zones has received more and more consideration being now recognized as fundamental in the localization of deformation and shear zone development, thus representing a case in which switching deformation mode and mechanisms interact and relate to each other. This contribution analyzes an example of a crystal plastic shear zone localized by brittle precursor formed within a host granitic-protomylonite during deformation in subduction-related environment. The studied structures, possibly formed by transient instability associated with fluctuations of pore fluid pressure and episodic strain rate variations may be considered as a small scale example of fault behaviour associated with a cycle of interseismic creep and coseismic rupture or a new analogue for episodic tremors and slow slip structures. Our case-study represents, therefore, a fossil example of association of fault structures related with stick-slip strain accomodation during subduction of continental crust.

Citation: Molli, G., Menegon, L., and Malasoma, A.: Switching deformation mode and mechanisms during subduction of continental crust: a case study from Alpine Corsica, Solid Earth Discuss., doi:10.5194/se-2017-11, in review, 2017.
Giancarlo Molli et al.
Giancarlo Molli et al.
Giancarlo Molli et al.

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Short summary
We present a new case study on the role of brittle precursors in nucleating shear zone We described an HP/LT microscale ultramylonite developed by brittle precursors induced during deformation within an host HP/LT granitic mylonite; We considered our case study a small scale example of fault behaviour associated with stick-slip.
We present a new case study on the role of brittle precursors in nucleating shear zone We...
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