10.6084/m9.figshare.3453887.v1
Rocco Novellino
Rocco
Novellino
Giacomo Prosser
Giacomo
Prosser
Richard Spiess
Richard
Spiess
Cecilia Viti
Cecilia
Viti
Fabrizio Agosta
Fabrizio
Agosta
Enrico Tavarnelli
Enrico
Tavarnelli
Francesco Bucci
Francesco
Bucci
Dynamic weakening along incipient low-angle normal faults in pelagic limestones (Southern Apennines, Italy)
Geological Society of London
2016
mechanism
decomposition
powder lubrication processes
pore fluid pressures
Southern Apennines
fault
Geology
2016-06-21 11:44:46
Journal contribution
https://geolsoc.figshare.com/articles/journal_contribution/Dynamic_weakening_along_incipient_low-angle_normal_faults_in_pelagic_limestones_Southern_Apennines_Italy_/3453887
<p>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.
</p>