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Strain localization at constant strain rate and changing stress conditions: Implications for plate boundary processes in the upper mantle
- Source :
- 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)
- Publication Year :
- 2021
-
Abstract
- 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.
- Subjects :
- 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
Subjects
Details
- Language :
- English
- ISSN :
- 2075163X
- Volume :
- 11
- Issue :
- 12
- Database :
- OpenAIRE
- Journal :
- Minerals
- Accession number :
- edsair.doi.dedup.....c53b4552ef0f28a6ea90e38cb680cc42