Articles | Volume 8, issue 6
Solid Earth, 8, 1193–1209, 2017
https://doi.org/10.5194/se-8-1193-2017
Solid Earth, 8, 1193–1209, 2017
https://doi.org/10.5194/se-8-1193-2017
Research article
19 Dec 2017
Research article | 19 Dec 2017

Hierarchical creep cavity formation in an ultramylonite and implications for phase mixing

James Gilgannon et al.

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Cited articles

Bauer, R. and Wilsdorf, H.: Void initiation in ductile fracture, Scripta Metall., 7, 1213–1220, https://doi.org/10.1016/0036-9748(73)90250-0, 1973.
Behrmann, J.: Crystal plasticity and superplasticity in quartzite; A natural example, Tectonophysics, 115, 101–129, https://doi.org/10.1016/0040-1951(85)90102-7, 1985.
Behrmann, J. and Mainprice, D.: Deformation mechanisms in a high-temperature quartz-feldspar mylonite: evidence for superplastic flow in the lower continental crust, Tectonophysics, 140, 297–305, https://doi.org/10.1016/0040-1951(87)90236-8, 1987.
Billia, M. A., Timms, N. E., Toy, V. G., Hart, R. D., and Prior, D. J.: Grain boundary dissolution porosity in quartzofeldspathic ultramylonites: Implications for permeability enhancement and weakening of mid-crustal shear zones, J. Struct. Geol., 53, 2–14, https://doi.org/10.1016/j.jsg.2013.05.004, 2013.
Caristan, Y.: The transition from high temperature creep to fracture in Maryland diabase, J. Geophys. Res.-Solid, 87, 6781–6790, https://doi.org/10.1029/JB087iB08p06781, 1982.
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Short summary
We examine rocks from the middle crust to explore how fluids circulate and influence a rock’s response to larger-scale tectonic movements. A model is developed in which fluids deep in the Earth migrate to clusters of pores generated during those movements. We document how distinct pores form in a specific order in association with local changes in how quartz deforms. The porosity evolves out of the deformation, changing the rate the rock moved under tectonic forces.