Slip along low-angle normal faults is a mechanical paradox requiring activation of strain weakening mechanisms. Microstructures present in the slip zones of incipient low-angle normal faults cutting carbonates in the Southern Apennines of Italy show that slip was promoted by two weakening mechanisms producing a reduction of the friction coefficient: (1) high pore fluid pressures; (2) dynamic weakening related to thermal decomposition indicated by decarbonation microstructures and concomitant localized dynamic calcite recrystallization. Furthermore, as a consequence of thermal decomposition, nanoparticles occur as infilling of injection veins, suggesting that powder lubrication processes are active along the slip surface during seismic slip.
Dynamic weakening along incipient low-angle normal faults in pelagic limestones (Southern Apennines, Italy)
Francesco Bucci
2015
Abstract
Slip along low-angle normal faults is a mechanical paradox requiring activation of strain weakening mechanisms. Microstructures present in the slip zones of incipient low-angle normal faults cutting carbonates in the Southern Apennines of Italy show that slip was promoted by two weakening mechanisms producing a reduction of the friction coefficient: (1) high pore fluid pressures; (2) dynamic weakening related to thermal decomposition indicated by decarbonation microstructures and concomitant localized dynamic calcite recrystallization. Furthermore, as a consequence of thermal decomposition, nanoparticles occur as infilling of injection veins, suggesting that powder lubrication processes are active along the slip surface during seismic slip.File | Dimensione | Formato | |
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prod_301131-doc_98455.pdf
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Descrizione: Dynamic weakening along incipient low-angle normal faults in pelagic limestones (Southern Apennines, Italy)
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prod_301131-doc_98458.pdf
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Descrizione: Dynamic weakening along incipient low-angle normal faults in pelagic limestones (Southern Apennines, Italy)
Tipologia:
Versione Editoriale (PDF)
Dimensione
2.44 MB
Formato
Adobe PDF
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2.44 MB | Adobe PDF | Visualizza/Apri Richiedi una copia |
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