Clay clast aggregates in gouges: New textural evidence for seismic faulting

被引:53
作者
Boutareaud, Sebastien [1 ]
Boullier, Anne-Marie [2 ,8 ]
Andreani, Muriel [3 ]
Calugaru, Dan-Gabriel [7 ]
Beck, Pierre [6 ]
Song, Sheng-Rong [5 ,8 ]
Shimamoto, Toshihiko [4 ]
机构
[1] ETH Zentrum, Inst Geol, CH-8092 Zurich, Switzerland
[2] Univ Grenoble 1, CNRS, Lab Geophys Interne & Tectonophys, F-38041 Grenoble 9, France
[3] Univ Lyon 1, Lab Sci Terre, Ecole Normale Super Lyon, CNRS,UMR 5570,INSU, F-69622 Villeurbanne, France
[4] Hiroshima Univ, Dept Earth & Planetary Syst Sci, Higashihiroshima 724, Japan
[5] Natl Taiwan Univ, Dept Geosci, Sect 4, Taipei 106, Taiwan
[6] Univ Grenoble 1, Lab Planetol Grenoble, F-38041 Grenoble, France
[7] Univ Franche Comte, Math Lab, F-25030 Besancon, France
[8] NSC, CNRS, ADEPT, Int Lab, Taipei, Taiwan
关键词
1999; CHI-CHI; MECHANICAL-PROPERTIES; LIQUID RETENTION; FLUID PRESSURE; PARTICLE-SIZE; POROUS-MEDIA; NOJIMA FAULT; EARTHQUAKE; FRICTION; WATER;
D O I
10.1029/2008JB006254
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Spherical aggregates named clay-clast aggregates (CCAs) have been reported from recent investigations on retrieved clay-bearing fault gouges from shallow depth seismogenic faults and rotary shear experiments conducted on clay-bearing gouge at seismic slip rates. The formation of CCAs appears to be related to the shearing of a smectite-rich granular material that expands and becomes fluidized. We have conducted additional high-velocity rotary shear experiments and low-velocity double-shear experiments. We demonstrate that a critical temperature depending on dynamic pressure-temperature conditions is needed for the formation of CCAs. This temperature corresponds to the phase transition of pore water from liquid to vapor or to critical, which induced gouge pore fluid expansion and therefore a thermal pressurization of the fault. A detailed examination by energy dispersive X-ray spectrometry (EDX-SEM) element mapping, SEM, and transmission electron microscopy (TEM) shows strong similar characteristics of experimental and natural CCAs with a concentric well-organized fabric of the cortex and reveals that their development may result from the combination of electrostatic and capillary forces in a critical reactive medium during the dynamic slip weakening. Accordingly, the occurrence of CCAs in natural clay-rich fault gouges constitutes new unequivocal textural evidence for shallow depth thermal pressurization and consequently for past seismic faulting.
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页数:15
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共 89 条
  • [1] Grain fracture in 3D numerical simulations of granular shear
    Abe, S
    Mair, K
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2005, 32 (05) : 1 - 4
  • [2] CATACLASTIC ROCKS OF THE SAN-GABRIEL FAULT - AN EXPRESSION OF DEFORMATION AT DEEPER CRUSTAL LEVELS IN THE SAN-ANDREAS FAULT ZONE
    ANDERSON, JL
    OSBORNE, RH
    PALMER, DF
    [J]. TECTONOPHYSICS, 1983, 98 (3-4) : 209 - &
  • [3] Catastrophic emplacement of the heart mountain block slide, Wyoming and Montana, USA
    Beutner, EC
    Gerbi, GP
    [J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2005, 117 (5-6) : 724 - 735
  • [4] Fluid-assisted healing processes in gouge-bearing faults: Insights from experiments on a rock analogue system
    Bos, B
    Spiers, CJ
    [J]. PURE AND APPLIED GEOPHYSICS, 2002, 159 (11-12) : 2537 - 2566
  • [5] Effect of phyllosilicates on fluid-assisted healing of gouge-bearing faults
    Bos, B
    Spiers, CJ
    [J]. EARTH AND PLANETARY SCIENCE LETTERS, 2000, 184 (01) : 199 - 210
  • [6] Microscale anatomy of the 1999 Chi-Chi earthquake fault zone
    Boullier, Anne-Marie
    Yeh, En-Chao
    Boutareaud, Sebastien
    Song, Sheng-Rong
    Tsai, Chin-Ho
    [J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 2009, 10
  • [7] BOUTAREAUD S, 2008, SPEC PUBL GEOL SOC, V299, P341
  • [8] BOUTAREAUD S, 2007, THESIS U FRANCHE COM
  • [9] BOUTAREAUD S, 2007, EOS T AGU S, V88
  • [10] Clay-clast aggregates: A new textural evidence for seismic fault sliding?
    Boutareaud, Sebastien
    Calugaru, Dan-Gabriel
    Han, Raehee
    Fabbri, Olivier
    Mizoguchi, Kazuo
    Tsutsumi, Akito
    Shimamoto, Toshihiko
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2008, 35 (05)