Rheology of talc sheared at high pressure and temperature: a case study for hot subduction zones
Talc is a common fault-coating mineral occurring in a variety of tectonic settings from the immediate subsurface down to more than 100km depth along subducting plate interfaces. It is considered to stabilize slip at seismogenic depth. To gain insight into the rheological behavior of talc and related...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Misra, Santanu [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2014transfer abstract |
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| Umfang: |
12 |
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| Übergeordnetes Werk: |
Enthalten in: Pediatric Adrenal Insufficiency - Quality Improvement from Clinic to Community - Borri, Maria ELSEVIER, 2020, international journal of geotectonics and the geology and physics of the interior of the earth, Amsterdam [u.a.] |
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| Übergeordnetes Werk: |
volume:610 ; year:2014 ; day:6 ; month:01 ; pages:51-62 ; extent:12 |
| Links: |
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| DOI / URN: |
10.1016/j.tecto.2013.10.009 |
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ELV033603901 |
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| 245 | 1 | 0 | |a Rheology of talc sheared at high pressure and temperature: a case study for hot subduction zones |
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| 520 | |a Talc is a common fault-coating mineral occurring in a variety of tectonic settings from the immediate subsurface down to more than 100km depth along subducting plate interfaces. It is considered to stabilize slip at seismogenic depth. To gain insight into the rheological behavior of talc and related deformation processes along the subduction interface of hot oceanic slabs, we conducted torsion experiments on intact synthetic talc samples at 200–600°C under 100–300MPa confining pressure at intermediate strain rates (3×10−4 and 2.45×10−3 s−1) for bulk shear strains up to 12.6.We also conducted stepping strain rate experiments to investigate rate and temperature dependence on sliding velocity and slide–hold–slide experiments to explore the re-strengthening and frictional healing of the sliding zones. The experimental results reveal 1) post-yield strain hardening followed by brief weakening episodes and then again strain hardening with increasing deformation and 2) a gradual transition of friction evolution from velocity-strengthening to velocity-neutral. Microstructural observations coupled with mechanical data suggest that talc rheology combines localized and distributed deformation, in a state called the brittle–ductile transition, with a predominance of crystal-plastic over cataclastic (brittle to semi-brittle) processes at 600°C and 300MPa confining pressure. These data suggest that talc cannot accumulate the tectonic stress necessary for earthquake-generating rupture along the subduction interface. This result concurs with the concept that in weak heterogeneous talc-rich material, strong asperities that can resist the tectonic stress to a greater extent are responsible for the consequential earthquake occurrence. | ||
| 520 | |a Talc is a common fault-coating mineral occurring in a variety of tectonic settings from the immediate subsurface down to more than 100km depth along subducting plate interfaces. It is considered to stabilize slip at seismogenic depth. To gain insight into the rheological behavior of talc and related deformation processes along the subduction interface of hot oceanic slabs, we conducted torsion experiments on intact synthetic talc samples at 200–600°C under 100–300MPa confining pressure at intermediate strain rates (3×10−4 and 2.45×10−3 s−1) for bulk shear strains up to 12.6.We also conducted stepping strain rate experiments to investigate rate and temperature dependence on sliding velocity and slide–hold–slide experiments to explore the re-strengthening and frictional healing of the sliding zones. The experimental results reveal 1) post-yield strain hardening followed by brief weakening episodes and then again strain hardening with increasing deformation and 2) a gradual transition of friction evolution from velocity-strengthening to velocity-neutral. Microstructural observations coupled with mechanical data suggest that talc rheology combines localized and distributed deformation, in a state called the brittle–ductile transition, with a predominance of crystal-plastic over cataclastic (brittle to semi-brittle) processes at 600°C and 300MPa confining pressure. These data suggest that talc cannot accumulate the tectonic stress necessary for earthquake-generating rupture along the subduction interface. This result concurs with the concept that in weak heterogeneous talc-rich material, strong asperities that can resist the tectonic stress to a greater extent are responsible for the consequential earthquake occurrence. | ||
| 700 | 1 | |a Boutareaud, Sébastien |4 oth | |
| 700 | 1 | |a Burg, Jean-Pierre |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier |a Borri, Maria ELSEVIER |t Pediatric Adrenal Insufficiency - Quality Improvement from Clinic to Community |d 2020 |d international journal of geotectonics and the geology and physics of the interior of the earth |g Amsterdam [u.a.] |w (DE-627)ELV00416637X |
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10.1016/j.tecto.2013.10.009 doi GBVA2014001000015.pica (DE-627)ELV033603901 (ELSEVIER)S0040-1951(13)00613-6 DE-627 ger DE-627 rakwb eng 550 550 DE-600 610 VZ 44.63 bkl Misra, Santanu verfasserin aut Rheology of talc sheared at high pressure and temperature: a case study for hot subduction zones 2014transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Talc is a common fault-coating mineral occurring in a variety of tectonic settings from the immediate subsurface down to more than 100km depth along subducting plate interfaces. It is considered to stabilize slip at seismogenic depth. To gain insight into the rheological behavior of talc and related deformation processes along the subduction interface of hot oceanic slabs, we conducted torsion experiments on intact synthetic talc samples at 200–600°C under 100–300MPa confining pressure at intermediate strain rates (3×10−4 and 2.45×10−3 s−1) for bulk shear strains up to 12.6.We also conducted stepping strain rate experiments to investigate rate and temperature dependence on sliding velocity and slide–hold–slide experiments to explore the re-strengthening and frictional healing of the sliding zones. The experimental results reveal 1) post-yield strain hardening followed by brief weakening episodes and then again strain hardening with increasing deformation and 2) a gradual transition of friction evolution from velocity-strengthening to velocity-neutral. Microstructural observations coupled with mechanical data suggest that talc rheology combines localized and distributed deformation, in a state called the brittle–ductile transition, with a predominance of crystal-plastic over cataclastic (brittle to semi-brittle) processes at 600°C and 300MPa confining pressure. These data suggest that talc cannot accumulate the tectonic stress necessary for earthquake-generating rupture along the subduction interface. This result concurs with the concept that in weak heterogeneous talc-rich material, strong asperities that can resist the tectonic stress to a greater extent are responsible for the consequential earthquake occurrence. Talc is a common fault-coating mineral occurring in a variety of tectonic settings from the immediate subsurface down to more than 100km depth along subducting plate interfaces. It is considered to stabilize slip at seismogenic depth. To gain insight into the rheological behavior of talc and related deformation processes along the subduction interface of hot oceanic slabs, we conducted torsion experiments on intact synthetic talc samples at 200–600°C under 100–300MPa confining pressure at intermediate strain rates (3×10−4 and 2.45×10−3 s−1) for bulk shear strains up to 12.6.We also conducted stepping strain rate experiments to investigate rate and temperature dependence on sliding velocity and slide–hold–slide experiments to explore the re-strengthening and frictional healing of the sliding zones. The experimental results reveal 1) post-yield strain hardening followed by brief weakening episodes and then again strain hardening with increasing deformation and 2) a gradual transition of friction evolution from velocity-strengthening to velocity-neutral. Microstructural observations coupled with mechanical data suggest that talc rheology combines localized and distributed deformation, in a state called the brittle–ductile transition, with a predominance of crystal-plastic over cataclastic (brittle to semi-brittle) processes at 600°C and 300MPa confining pressure. These data suggest that talc cannot accumulate the tectonic stress necessary for earthquake-generating rupture along the subduction interface. This result concurs with the concept that in weak heterogeneous talc-rich material, strong asperities that can resist the tectonic stress to a greater extent are responsible for the consequential earthquake occurrence. Boutareaud, Sébastien oth Burg, Jean-Pierre oth Enthalten in Elsevier Borri, Maria ELSEVIER Pediatric Adrenal Insufficiency - Quality Improvement from Clinic to Community 2020 international journal of geotectonics and the geology and physics of the interior of the earth Amsterdam [u.a.] (DE-627)ELV00416637X volume:610 year:2014 day:6 month:01 pages:51-62 extent:12 https://doi.org/10.1016/j.tecto.2013.10.009 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.63 Krankenpflege VZ AR 610 2014 6 0106 51-62 12 045F 550 |
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10.1016/j.tecto.2013.10.009 doi GBVA2014001000015.pica (DE-627)ELV033603901 (ELSEVIER)S0040-1951(13)00613-6 DE-627 ger DE-627 rakwb eng 550 550 DE-600 610 VZ 44.63 bkl Misra, Santanu verfasserin aut Rheology of talc sheared at high pressure and temperature: a case study for hot subduction zones 2014transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Talc is a common fault-coating mineral occurring in a variety of tectonic settings from the immediate subsurface down to more than 100km depth along subducting plate interfaces. It is considered to stabilize slip at seismogenic depth. To gain insight into the rheological behavior of talc and related deformation processes along the subduction interface of hot oceanic slabs, we conducted torsion experiments on intact synthetic talc samples at 200–600°C under 100–300MPa confining pressure at intermediate strain rates (3×10−4 and 2.45×10−3 s−1) for bulk shear strains up to 12.6.We also conducted stepping strain rate experiments to investigate rate and temperature dependence on sliding velocity and slide–hold–slide experiments to explore the re-strengthening and frictional healing of the sliding zones. The experimental results reveal 1) post-yield strain hardening followed by brief weakening episodes and then again strain hardening with increasing deformation and 2) a gradual transition of friction evolution from velocity-strengthening to velocity-neutral. Microstructural observations coupled with mechanical data suggest that talc rheology combines localized and distributed deformation, in a state called the brittle–ductile transition, with a predominance of crystal-plastic over cataclastic (brittle to semi-brittle) processes at 600°C and 300MPa confining pressure. These data suggest that talc cannot accumulate the tectonic stress necessary for earthquake-generating rupture along the subduction interface. This result concurs with the concept that in weak heterogeneous talc-rich material, strong asperities that can resist the tectonic stress to a greater extent are responsible for the consequential earthquake occurrence. Talc is a common fault-coating mineral occurring in a variety of tectonic settings from the immediate subsurface down to more than 100km depth along subducting plate interfaces. It is considered to stabilize slip at seismogenic depth. To gain insight into the rheological behavior of talc and related deformation processes along the subduction interface of hot oceanic slabs, we conducted torsion experiments on intact synthetic talc samples at 200–600°C under 100–300MPa confining pressure at intermediate strain rates (3×10−4 and 2.45×10−3 s−1) for bulk shear strains up to 12.6.We also conducted stepping strain rate experiments to investigate rate and temperature dependence on sliding velocity and slide–hold–slide experiments to explore the re-strengthening and frictional healing of the sliding zones. The experimental results reveal 1) post-yield strain hardening followed by brief weakening episodes and then again strain hardening with increasing deformation and 2) a gradual transition of friction evolution from velocity-strengthening to velocity-neutral. Microstructural observations coupled with mechanical data suggest that talc rheology combines localized and distributed deformation, in a state called the brittle–ductile transition, with a predominance of crystal-plastic over cataclastic (brittle to semi-brittle) processes at 600°C and 300MPa confining pressure. These data suggest that talc cannot accumulate the tectonic stress necessary for earthquake-generating rupture along the subduction interface. This result concurs with the concept that in weak heterogeneous talc-rich material, strong asperities that can resist the tectonic stress to a greater extent are responsible for the consequential earthquake occurrence. Boutareaud, Sébastien oth Burg, Jean-Pierre oth Enthalten in Elsevier Borri, Maria ELSEVIER Pediatric Adrenal Insufficiency - Quality Improvement from Clinic to Community 2020 international journal of geotectonics and the geology and physics of the interior of the earth Amsterdam [u.a.] (DE-627)ELV00416637X volume:610 year:2014 day:6 month:01 pages:51-62 extent:12 https://doi.org/10.1016/j.tecto.2013.10.009 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.63 Krankenpflege VZ AR 610 2014 6 0106 51-62 12 045F 550 |
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10.1016/j.tecto.2013.10.009 doi GBVA2014001000015.pica (DE-627)ELV033603901 (ELSEVIER)S0040-1951(13)00613-6 DE-627 ger DE-627 rakwb eng 550 550 DE-600 610 VZ 44.63 bkl Misra, Santanu verfasserin aut Rheology of talc sheared at high pressure and temperature: a case study for hot subduction zones 2014transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Talc is a common fault-coating mineral occurring in a variety of tectonic settings from the immediate subsurface down to more than 100km depth along subducting plate interfaces. It is considered to stabilize slip at seismogenic depth. To gain insight into the rheological behavior of talc and related deformation processes along the subduction interface of hot oceanic slabs, we conducted torsion experiments on intact synthetic talc samples at 200–600°C under 100–300MPa confining pressure at intermediate strain rates (3×10−4 and 2.45×10−3 s−1) for bulk shear strains up to 12.6.We also conducted stepping strain rate experiments to investigate rate and temperature dependence on sliding velocity and slide–hold–slide experiments to explore the re-strengthening and frictional healing of the sliding zones. The experimental results reveal 1) post-yield strain hardening followed by brief weakening episodes and then again strain hardening with increasing deformation and 2) a gradual transition of friction evolution from velocity-strengthening to velocity-neutral. Microstructural observations coupled with mechanical data suggest that talc rheology combines localized and distributed deformation, in a state called the brittle–ductile transition, with a predominance of crystal-plastic over cataclastic (brittle to semi-brittle) processes at 600°C and 300MPa confining pressure. These data suggest that talc cannot accumulate the tectonic stress necessary for earthquake-generating rupture along the subduction interface. This result concurs with the concept that in weak heterogeneous talc-rich material, strong asperities that can resist the tectonic stress to a greater extent are responsible for the consequential earthquake occurrence. Talc is a common fault-coating mineral occurring in a variety of tectonic settings from the immediate subsurface down to more than 100km depth along subducting plate interfaces. It is considered to stabilize slip at seismogenic depth. To gain insight into the rheological behavior of talc and related deformation processes along the subduction interface of hot oceanic slabs, we conducted torsion experiments on intact synthetic talc samples at 200–600°C under 100–300MPa confining pressure at intermediate strain rates (3×10−4 and 2.45×10−3 s−1) for bulk shear strains up to 12.6.We also conducted stepping strain rate experiments to investigate rate and temperature dependence on sliding velocity and slide–hold–slide experiments to explore the re-strengthening and frictional healing of the sliding zones. The experimental results reveal 1) post-yield strain hardening followed by brief weakening episodes and then again strain hardening with increasing deformation and 2) a gradual transition of friction evolution from velocity-strengthening to velocity-neutral. Microstructural observations coupled with mechanical data suggest that talc rheology combines localized and distributed deformation, in a state called the brittle–ductile transition, with a predominance of crystal-plastic over cataclastic (brittle to semi-brittle) processes at 600°C and 300MPa confining pressure. These data suggest that talc cannot accumulate the tectonic stress necessary for earthquake-generating rupture along the subduction interface. This result concurs with the concept that in weak heterogeneous talc-rich material, strong asperities that can resist the tectonic stress to a greater extent are responsible for the consequential earthquake occurrence. Boutareaud, Sébastien oth Burg, Jean-Pierre oth Enthalten in Elsevier Borri, Maria ELSEVIER Pediatric Adrenal Insufficiency - Quality Improvement from Clinic to Community 2020 international journal of geotectonics and the geology and physics of the interior of the earth Amsterdam [u.a.] (DE-627)ELV00416637X volume:610 year:2014 day:6 month:01 pages:51-62 extent:12 https://doi.org/10.1016/j.tecto.2013.10.009 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.63 Krankenpflege VZ AR 610 2014 6 0106 51-62 12 045F 550 |
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10.1016/j.tecto.2013.10.009 doi GBVA2014001000015.pica (DE-627)ELV033603901 (ELSEVIER)S0040-1951(13)00613-6 DE-627 ger DE-627 rakwb eng 550 550 DE-600 610 VZ 44.63 bkl Misra, Santanu verfasserin aut Rheology of talc sheared at high pressure and temperature: a case study for hot subduction zones 2014transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Talc is a common fault-coating mineral occurring in a variety of tectonic settings from the immediate subsurface down to more than 100km depth along subducting plate interfaces. It is considered to stabilize slip at seismogenic depth. To gain insight into the rheological behavior of talc and related deformation processes along the subduction interface of hot oceanic slabs, we conducted torsion experiments on intact synthetic talc samples at 200–600°C under 100–300MPa confining pressure at intermediate strain rates (3×10−4 and 2.45×10−3 s−1) for bulk shear strains up to 12.6.We also conducted stepping strain rate experiments to investigate rate and temperature dependence on sliding velocity and slide–hold–slide experiments to explore the re-strengthening and frictional healing of the sliding zones. The experimental results reveal 1) post-yield strain hardening followed by brief weakening episodes and then again strain hardening with increasing deformation and 2) a gradual transition of friction evolution from velocity-strengthening to velocity-neutral. Microstructural observations coupled with mechanical data suggest that talc rheology combines localized and distributed deformation, in a state called the brittle–ductile transition, with a predominance of crystal-plastic over cataclastic (brittle to semi-brittle) processes at 600°C and 300MPa confining pressure. These data suggest that talc cannot accumulate the tectonic stress necessary for earthquake-generating rupture along the subduction interface. This result concurs with the concept that in weak heterogeneous talc-rich material, strong asperities that can resist the tectonic stress to a greater extent are responsible for the consequential earthquake occurrence. Talc is a common fault-coating mineral occurring in a variety of tectonic settings from the immediate subsurface down to more than 100km depth along subducting plate interfaces. It is considered to stabilize slip at seismogenic depth. To gain insight into the rheological behavior of talc and related deformation processes along the subduction interface of hot oceanic slabs, we conducted torsion experiments on intact synthetic talc samples at 200–600°C under 100–300MPa confining pressure at intermediate strain rates (3×10−4 and 2.45×10−3 s−1) for bulk shear strains up to 12.6.We also conducted stepping strain rate experiments to investigate rate and temperature dependence on sliding velocity and slide–hold–slide experiments to explore the re-strengthening and frictional healing of the sliding zones. The experimental results reveal 1) post-yield strain hardening followed by brief weakening episodes and then again strain hardening with increasing deformation and 2) a gradual transition of friction evolution from velocity-strengthening to velocity-neutral. Microstructural observations coupled with mechanical data suggest that talc rheology combines localized and distributed deformation, in a state called the brittle–ductile transition, with a predominance of crystal-plastic over cataclastic (brittle to semi-brittle) processes at 600°C and 300MPa confining pressure. These data suggest that talc cannot accumulate the tectonic stress necessary for earthquake-generating rupture along the subduction interface. This result concurs with the concept that in weak heterogeneous talc-rich material, strong asperities that can resist the tectonic stress to a greater extent are responsible for the consequential earthquake occurrence. Boutareaud, Sébastien oth Burg, Jean-Pierre oth Enthalten in Elsevier Borri, Maria ELSEVIER Pediatric Adrenal Insufficiency - Quality Improvement from Clinic to Community 2020 international journal of geotectonics and the geology and physics of the interior of the earth Amsterdam [u.a.] (DE-627)ELV00416637X volume:610 year:2014 day:6 month:01 pages:51-62 extent:12 https://doi.org/10.1016/j.tecto.2013.10.009 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.63 Krankenpflege VZ AR 610 2014 6 0106 51-62 12 045F 550 |
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10.1016/j.tecto.2013.10.009 doi GBVA2014001000015.pica (DE-627)ELV033603901 (ELSEVIER)S0040-1951(13)00613-6 DE-627 ger DE-627 rakwb eng 550 550 DE-600 610 VZ 44.63 bkl Misra, Santanu verfasserin aut Rheology of talc sheared at high pressure and temperature: a case study for hot subduction zones 2014transfer abstract 12 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Talc is a common fault-coating mineral occurring in a variety of tectonic settings from the immediate subsurface down to more than 100km depth along subducting plate interfaces. It is considered to stabilize slip at seismogenic depth. To gain insight into the rheological behavior of talc and related deformation processes along the subduction interface of hot oceanic slabs, we conducted torsion experiments on intact synthetic talc samples at 200–600°C under 100–300MPa confining pressure at intermediate strain rates (3×10−4 and 2.45×10−3 s−1) for bulk shear strains up to 12.6.We also conducted stepping strain rate experiments to investigate rate and temperature dependence on sliding velocity and slide–hold–slide experiments to explore the re-strengthening and frictional healing of the sliding zones. The experimental results reveal 1) post-yield strain hardening followed by brief weakening episodes and then again strain hardening with increasing deformation and 2) a gradual transition of friction evolution from velocity-strengthening to velocity-neutral. Microstructural observations coupled with mechanical data suggest that talc rheology combines localized and distributed deformation, in a state called the brittle–ductile transition, with a predominance of crystal-plastic over cataclastic (brittle to semi-brittle) processes at 600°C and 300MPa confining pressure. These data suggest that talc cannot accumulate the tectonic stress necessary for earthquake-generating rupture along the subduction interface. This result concurs with the concept that in weak heterogeneous talc-rich material, strong asperities that can resist the tectonic stress to a greater extent are responsible for the consequential earthquake occurrence. Talc is a common fault-coating mineral occurring in a variety of tectonic settings from the immediate subsurface down to more than 100km depth along subducting plate interfaces. It is considered to stabilize slip at seismogenic depth. To gain insight into the rheological behavior of talc and related deformation processes along the subduction interface of hot oceanic slabs, we conducted torsion experiments on intact synthetic talc samples at 200–600°C under 100–300MPa confining pressure at intermediate strain rates (3×10−4 and 2.45×10−3 s−1) for bulk shear strains up to 12.6.We also conducted stepping strain rate experiments to investigate rate and temperature dependence on sliding velocity and slide–hold–slide experiments to explore the re-strengthening and frictional healing of the sliding zones. The experimental results reveal 1) post-yield strain hardening followed by brief weakening episodes and then again strain hardening with increasing deformation and 2) a gradual transition of friction evolution from velocity-strengthening to velocity-neutral. Microstructural observations coupled with mechanical data suggest that talc rheology combines localized and distributed deformation, in a state called the brittle–ductile transition, with a predominance of crystal-plastic over cataclastic (brittle to semi-brittle) processes at 600°C and 300MPa confining pressure. These data suggest that talc cannot accumulate the tectonic stress necessary for earthquake-generating rupture along the subduction interface. This result concurs with the concept that in weak heterogeneous talc-rich material, strong asperities that can resist the tectonic stress to a greater extent are responsible for the consequential earthquake occurrence. Boutareaud, Sébastien oth Burg, Jean-Pierre oth Enthalten in Elsevier Borri, Maria ELSEVIER Pediatric Adrenal Insufficiency - Quality Improvement from Clinic to Community 2020 international journal of geotectonics and the geology and physics of the interior of the earth Amsterdam [u.a.] (DE-627)ELV00416637X volume:610 year:2014 day:6 month:01 pages:51-62 extent:12 https://doi.org/10.1016/j.tecto.2013.10.009 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.63 Krankenpflege VZ AR 610 2014 6 0106 51-62 12 045F 550 |
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rheology of talc sheared at high pressure and temperature: a case study for hot subduction zones |
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Rheology of talc sheared at high pressure and temperature: a case study for hot subduction zones |
| abstract |
Talc is a common fault-coating mineral occurring in a variety of tectonic settings from the immediate subsurface down to more than 100km depth along subducting plate interfaces. It is considered to stabilize slip at seismogenic depth. To gain insight into the rheological behavior of talc and related deformation processes along the subduction interface of hot oceanic slabs, we conducted torsion experiments on intact synthetic talc samples at 200–600°C under 100–300MPa confining pressure at intermediate strain rates (3×10−4 and 2.45×10−3 s−1) for bulk shear strains up to 12.6.We also conducted stepping strain rate experiments to investigate rate and temperature dependence on sliding velocity and slide–hold–slide experiments to explore the re-strengthening and frictional healing of the sliding zones. The experimental results reveal 1) post-yield strain hardening followed by brief weakening episodes and then again strain hardening with increasing deformation and 2) a gradual transition of friction evolution from velocity-strengthening to velocity-neutral. Microstructural observations coupled with mechanical data suggest that talc rheology combines localized and distributed deformation, in a state called the brittle–ductile transition, with a predominance of crystal-plastic over cataclastic (brittle to semi-brittle) processes at 600°C and 300MPa confining pressure. These data suggest that talc cannot accumulate the tectonic stress necessary for earthquake-generating rupture along the subduction interface. This result concurs with the concept that in weak heterogeneous talc-rich material, strong asperities that can resist the tectonic stress to a greater extent are responsible for the consequential earthquake occurrence. |
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Talc is a common fault-coating mineral occurring in a variety of tectonic settings from the immediate subsurface down to more than 100km depth along subducting plate interfaces. It is considered to stabilize slip at seismogenic depth. To gain insight into the rheological behavior of talc and related deformation processes along the subduction interface of hot oceanic slabs, we conducted torsion experiments on intact synthetic talc samples at 200–600°C under 100–300MPa confining pressure at intermediate strain rates (3×10−4 and 2.45×10−3 s−1) for bulk shear strains up to 12.6.We also conducted stepping strain rate experiments to investigate rate and temperature dependence on sliding velocity and slide–hold–slide experiments to explore the re-strengthening and frictional healing of the sliding zones. The experimental results reveal 1) post-yield strain hardening followed by brief weakening episodes and then again strain hardening with increasing deformation and 2) a gradual transition of friction evolution from velocity-strengthening to velocity-neutral. Microstructural observations coupled with mechanical data suggest that talc rheology combines localized and distributed deformation, in a state called the brittle–ductile transition, with a predominance of crystal-plastic over cataclastic (brittle to semi-brittle) processes at 600°C and 300MPa confining pressure. These data suggest that talc cannot accumulate the tectonic stress necessary for earthquake-generating rupture along the subduction interface. This result concurs with the concept that in weak heterogeneous talc-rich material, strong asperities that can resist the tectonic stress to a greater extent are responsible for the consequential earthquake occurrence. |
| abstract_unstemmed |
Talc is a common fault-coating mineral occurring in a variety of tectonic settings from the immediate subsurface down to more than 100km depth along subducting plate interfaces. It is considered to stabilize slip at seismogenic depth. To gain insight into the rheological behavior of talc and related deformation processes along the subduction interface of hot oceanic slabs, we conducted torsion experiments on intact synthetic talc samples at 200–600°C under 100–300MPa confining pressure at intermediate strain rates (3×10−4 and 2.45×10−3 s−1) for bulk shear strains up to 12.6.We also conducted stepping strain rate experiments to investigate rate and temperature dependence on sliding velocity and slide–hold–slide experiments to explore the re-strengthening and frictional healing of the sliding zones. The experimental results reveal 1) post-yield strain hardening followed by brief weakening episodes and then again strain hardening with increasing deformation and 2) a gradual transition of friction evolution from velocity-strengthening to velocity-neutral. Microstructural observations coupled with mechanical data suggest that talc rheology combines localized and distributed deformation, in a state called the brittle–ductile transition, with a predominance of crystal-plastic over cataclastic (brittle to semi-brittle) processes at 600°C and 300MPa confining pressure. These data suggest that talc cannot accumulate the tectonic stress necessary for earthquake-generating rupture along the subduction interface. This result concurs with the concept that in weak heterogeneous talc-rich material, strong asperities that can resist the tectonic stress to a greater extent are responsible for the consequential earthquake occurrence. |
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