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Transient water adsorption on newly formed fault gouge and its relation to frictional heating
Author(s) -
Mizoguchi K.,
Hirose T.
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl069776
Subject(s) - adsorption , fault gouge , slip (aerodynamics) , materials science , geology , fault (geology) , transient (computer programming) , geotechnical engineering , composite material , mineralogy , thermodynamics , chemistry , seismology , physics , organic chemistry , computer science , operating system
Determination of the amount of frictional heating on faults during slips provides insight into the mechanics of faulting. Fault slips cause frictional heating as well as production of gouge materials. Newly formed gouge is mechanochemically stimulated to gain a transient water adsorption ability. We showed that the synthetic gouge from friction tests on rocks at a 1 mm/s slip rate without frictional heating adsorbed a large amount of water, comparable to that adsorbed by clay minerals. The amount of adsorbed water decreased significantly with increasing slip rate to 100 mm/s, where the fault temperature increased above 400°C. We confirmed there was no additional adsorption on the heated gouges after termination of the slip. We conclude that the adsorption state can be considered a new indicator of a temperature rise of < 400°C by frictional heating associated with recent, near‐surface faulting.