期刊
JOURNAL OF THE GEOLOGICAL SOCIETY
卷 172, 期 3, 页码 283-286出版社
GEOLOGICAL SOC PUBL HOUSE
DOI: 10.1144/jgs2014-091
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资金
- RIL Funds of the Basilicata University
- Padova University [CPDA 122324/12]
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, nano-particles occur as infilling of injection veins, suggesting that powder lubrication processes are active along the slip surface during seismic slip.
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