Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.1029/2020JB020539 |
Licence  |
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| Title (Primary) | A model of failure and localization of basalt at temperature and pressure conditions spanning the brittle‐ductile transition |
| Author | Parisio, F.; Lehmann, C.; Nagel, T. |
| Source Titel | Journal of Geophysical Research-Solid Earth |
| Year | 2020 |
| Department | ENVINF |
| Volume | 125 |
| Issue | 11 |
| Page From | e2020JB020539 |
| Language | englisch |
| Abstract | Natural phenomena such as seismicity, volcanism and fluid circulation in volcanic areas are influenced by the mechanical response of intact basalt. When subjected to a wide range of environmental loading conditions, basalt exhibits inelastic deformation characteristics ranging from brittle to ductile behavior. In this manuscript, we present a new constitutive model of basalt that spans the brittle‐ductile transition by covering a wide range of mean effective stress, temperature and strain rate. The model has been implemented into the automatic constitutive model code generator MFront, which we have coupled with the finite element solver OpenGeoSys. The software employed for the computations is open source, accessible and offers a versatile solution to model thermo‐mechanical failure of rocks. Within this framework, we have performed numerical simulations that highlight the localization of strains and stresses under triaxial compression. Predictions of the constitutive response, of the depth of the brittle‐ductile transition and of the localization patterns are in agreement with laboratory and in‐situ observations. The results have important geophysical implications as they provide a constitutive basis that explains the mechanisms through which basalt can deform in a brittle fashion at temperatures above 600 °C. |
| Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=23784 |
| Parisio, F., Lehmann, C., Nagel, T. (2020): A model of failure and localization of basalt at temperature and pressure conditions spanning the brittle‐ductile transition J. Geophys. Res.-Solid Earth 125 (11), e2020JB020539 10.1029/2020JB020539 |
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