Strain localization at constant strain rate and changing stress conditions: Implications for plate boundary processes in the upper mantle

Autor:	Newman, Julie, Chatzaras, Vasileios, Tikoff, Basil, Wijbrans, Jan R., Lamb, William M., Drury, Martyn R., Structural geology and EM, Structural geology & tectonics
Přispěvatelé:	Earth Sciences, Structural geology and EM, Structural geology & tectonics
Jazyk:	angličtina
Rok vydání:	2021
Předmět:	Strain (chemistry) Pyrenees Strain rate Geology Geometry Mineralogy Geotechnical Engineering and Engineering Geology Stress Stress (mechanics) strain localization peridotite mylonite stress strain rate Deformation mechanism Shear (geology) SDG 14 - Life Below Water Deformation (engineering) Shear zone Mylonite Peridotite Strain localization QE351-399.2
Zdroj:	Newman, J, Chatzaras, V, Tikoff, B, Wijbrans, J R, Lamb, W M & Drury, M R 2021, ' Strain localization at constant strain rate and changing stress conditions: Implications for plate boundary processes in the upper mantle ', Minerals, vol. 11, no. 12, 1351, pp. 1-25 . https://doi.org/10.3390/min11121351 Minerals, 11(12), 1. Multidisciplinary Digital Publishing Institute (MDPI) Minerals; Volume 11; Issue 12; Pages: 1351 Minerals, 11(12):1351, 1-25. Multidisciplinary Digital Publishing Institute Minerals, Vol 11, Iss 1351, p 1351 (2021)
ISSN:	2075-163X
DOI:	10.3390/min11121351
Popis:	We present results from a natural deformed shear zone in the Turon de Técouère massif of the French Pyrenees that directly addresses the processes involved in strain localization, a topic that has been investigated for the last 40 years by structural geologists. Paleopiezometry indicates that differential stresses are variable both spatially across the zone, and temporally during exhumation. We have, however, also calculated strain rate, which remains constant despite changes in stress. This result appears to be at odds with recent experimental deformation on monophase (olivine) rocks, which indicate that strain localization occurs dominantly as a result of constant stress. We hypothesize that in the Turon de Técouère massif—and many natural shear zones—strain localization occurs as a result of reactions, which decrease the grain size and promote the activation of grain size sensitive deformation mechanisms. From a tectonics perspective, this study indicates that the deformation rate in a particular plate boundary is relatively uniform. Stress, however, varies to accommodate this deformation. This viewpoint is consistent with deformation at a plate boundary, but it is not the typical way in which we interpret strain localization.
Databáze:	OpenAIRE
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