GRAIN-SIZE-SENSITIVE FLOW AND SHEAR-STRESS ENHANCEMENT AT THE BRITTLE-DUCTILE TRANSITION OF THE CONTINENTAL CRUST
- DSpace Home
- →
- Геология России
- →
- ELibrary
- →
- View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.
dc.contributor.author | Gueydan F. | |
dc.contributor.author | Leroy Y.M. | |
dc.contributor.author | Jolivet L. | |
dc.date.accessioned | 2021-04-03T01:39:58Z | |
dc.date.available | 2021-04-03T01:39:58Z | |
dc.date.issued | 2001 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=882773 | |
dc.identifier.citation | International Journal of Earth Sciences, 2001, 90, 1, 181-196 | |
dc.identifier.issn | 1437-3254 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/27211 | |
dc.description.abstract | Localized shear zones along low-angle normal faults have been identified in regions of extension at the brittle-ductile transition of the continental crust. The possibility of the strain localizing at a depth of 10 km is interpreted here as a consequence of an increase in the equivalent shear stress applied to the flow of the lower crust. This enhancement of the flow stress is seen as a prerequisite for the triggering of brittle deformation mechanisms leading to strain localization. The lower crust rheology used to examine this stress increase is strain-rate, temperature and grain-size dependent, due to the coupling of dislocation and diffusion creep. The model structure proposed consists of a top layer, the upper crust, gliding rigidly above a bottom layer, the lower crust, which deforms in simple shear. During a short time interval (1400 years), the equivalent shear stress is found to increase by a factor of up to 3 (67 MPa for anorthite and 17 MPa for quartz). For anorthite, this stress could explain the activation of a Mohr-Coulomb failure with a friction coefficient of 0.2, which is reasonable at the depth of 10 km. Dislocation creep is activated during a rapid change in the prescribed velocity, whereas diffusion creep dominates if the velocity is held constant, highlighting the importance of grain-size sensitivity for lower crustal rheology. | |
dc.subject | METAMORPHIC CORE COMPLEXES | |
dc.subject | CONTINENTAL LOWER CRUST | |
dc.subject | GRAIN-SIZE-SENSITIVE RHEOLOGY | |
dc.subject | SHEAR ZONES | |
dc.subject | SHEAR STRESS ENHANCEMENT | |
dc.subject | BRITTLE DEFORMATION MECHANISMS | |
dc.subject | FINITE-ELEMENT METHOD | |
dc.title | GRAIN-SIZE-SENSITIVE FLOW AND SHEAR-STRESS ENHANCEMENT AT THE BRITTLE-DUCTILE TRANSITION OF THE CONTINENTAL CRUST | |
dc.type | Статья |
Files in this item
Files | Size | Format | View |
---|---|---|---|
There are no files associated with this item. |
This item appears in the following Collection(s)
-
ELibrary
Метаданные публикаций с сайта https://www.elibrary.ru