Co-seismic frictional melting along an out-of-sequence thrust in the Shimanto accretionary complex. Implications on the tsunamigenic potential of splay faults in modern subduction zones

Mukoyoshi, Hideki; Sakaguchi, Arito; Otsuki, Kenshiro; Hirono, Tetsuro; Soh, Wonn

doi:10.1016/j.epsl.2006.02.039

Cited by 61 publications

(69 citation statements)

References 39 publications

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“…b Vitrinite reflectance (V.R.) values for each sample are from Ikesawa et al (2005) for samples MGLB and MGUB, from Mukoyoshi et al (2006) for sample KRB, from Sakaguchi (1999) for sample OKB, and from Ohmori (1998) separated with a centrifuge and dropped onto glass slides to prepare oriented mounts by air-drying in an oven at 60 °C (herein referred to as the "AD" (air-drying) state). These mounts were saturated with ethylene-glycol vapor overnight at 60 °C ("EG").…”

Section: Laboratory Methodsmentioning

confidence: 99%

“…Values of Ro were converted to paleotemperatures using equations from Barker (1988) and Sweeney and Burnham (1990) (heating durations of 1 Myr and 10 Myr). This procedure nominally contains an error of ±30 °C (Laughland and Underwood 1993; Mukoyoshi et al 2006). The determined temperatures range from 160 ± 30 °C (MGLB) to 304 ± 30 °C (MKB).…”

Section: Geological Background and Analyzed Samplesmentioning

confidence: 99%

“…The study areas include the upper sections of the Mugi mélange (MGUB), the lower sections of the Mugi mélange (MGLB) (Ikesawa et al 2005;Kimura et al 2012), the Kure mélange (KRB) (Mukoyoshi et al 2006), the Okitsu mélange (OKB) Sakaguchi 1999), and the Makimine mélange (MKB) (Fig. 1).…”

Section: Geological Background and Analyzed Samplesmentioning

confidence: 99%

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Alteration and dehydration of subducting oceanic crust within subduction zones: implications for décollement step-down and plate-boundary seismogenesis

Kameda

Inoué

Tanikawa

et al. 2017

Earth Planets Space

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The alteration and dehydration of predominantly basaltic subducting oceanic crustal material are thought to be important controls on the mechanical and hydrological properties of the seismogenic plate interface below accretionary prisms. This study focuses on pillow basalts exposed in an ancient accretionary complex within the Shimanto Belt of southwest Japan and provides new quantitative data that provide insight into clay mineral reactions and the associated dehydration of underthrust basalts. Whole-rock and clay-fraction X-ray diffraction analyses indicate that the progressive conversion of saponite to chlorite proceeds under an almost constant bulk-rock mineral assemblage. These clay mineral reactions may persist to deep crustal levels (~320 °C), possibly contributing to the bulk dehydration of the basalt and supplying fluid to plate-boundary fault systems. This dehydration can also cause fluid pressurization at certain horizons within hydrous basalt sequences, eventually leading to fracturing and subsequent underplating of upper basement rock into the overriding accretionary prism. This dehydration-induced breakage of the basalt can explain variations in the thickness of accreted basalt fragments within accretionary prisms as well as the reported geochemical compositions of mineralized veins associated with exposed basalts in onland locations. This fracturing of intact basalt can also nucleate seismic rupturing that would subsequently propagate along seismogenic plate interfaces.© The Author(s) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Section: Laboratory Methodsmentioning

confidence: 99%

Section: Geological Background and Analyzed Samplesmentioning

confidence: 99%

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Alteration and dehydration of subducting oceanic crust within subduction zones: implications for décollement step-down and plate-boundary seismogenesis

Kameda

Inoué

Tanikawa

et al. 2017

Earth Planets Space

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“…Exhumed subduction-accretion complexes provide a unique opportunity to investigate conditions in seismogenic zones. Pseudotachylytes (i.e., solidified frictional melts) were recently found in exhumed subduction thrusts, roof thrusts of duplex structures [Ikesawa et al, 2003;Rowe et al, 2005;Ujiie et al, 2007] and out-of-sequence thrusts [Mukoyoshi et al, 2006;Okamoto et al, 2006]. They were formed at depths of 2.5-14 km.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of frictional melting of argillite at high slip rates: Implications for seismic slip in subduction‐accretion complexes

et al. 2009

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[1] Discovery of pseudotachylytes from exhumed accretionary complexes indicates that frictional melting occurred along illite-rich, argillite-derived slip zones during subduction earthquakes. We conducted high-velocity friction experiments on argillite at a slip rate of 1.13 m/s and normal stresses of 2.67-13.33 MPa. Experiments show slip weakening followed by slip strengthening. Slip weakening is associated with the formation and shearing of low-viscosity melt patches. The subsequent slip strengthening occurred despite the reduction in shear strain rate due to the growth (thickening) of melt layer, suggesting that the viscosity of melt layer increased with slip. Microstructural and chemical analyses suggest that the viscosity increase during the slip strengthening is not due to an increase in the volume fraction of solid grains and bubbles in the melt layer but could be caused primarily by dehydration of the melt layer. Our experimental results suggest that viscous braking can be efficient at shallow depths of subduction-accretion complexes if substantial melt dehydration occurs on a timescale of seismic slip. Melt lubrication can possibly occur at greater depths within subduction-accretion complexes because the ratio of viscous shear to normal stress decreases with depth. Argillite-derived natural pseudotachylytes formed at seismogenic depths in subduction-accretion complexes are more hydrous than the experimentally generated pseudotachylytes and may be evidence of nearly complete stress drop.

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“…, Wang and Hu, 1996;Saffer et al, 2003;Bangs et al, 2004;Tobin and Saffer, 2009 , Moore et al, 2001;Kimura et al, 2007;Morgan et al, 2007;Saffer, 2007;Fagereng andSibson, 2010 Kimura andMukai, 1991;Onishi and Kimura, 1995;Hashimoto and Kimura, 1999;Hashimoto et al, 2003;Tokiwa, 2009;Tokiwa andYamamoto, 2011 Matsumura et al, 2003;Shibata and Hashimoto, 2005;Hashimoto et al, 2012 Hashimoto and Kimura, 1999;Hashimoto et al, 2002;Ujiie et al, 2007aIkesawa et al, 2003Kitamura et al, 2005;Ujiie et al, 2007b;Hashimoto et al, 2012Ohmori et al, 1997Sakaguchi, 1999;Kondo et al, 2005;Okamoto et al, 2006;Mukoyoshi et al, 2006;Mukoyoshi et al, 2009 Onishi andKimura, 1995;Kimura, 1999 Shibata andHashimoto et al, 2012Ujiie et al, 2007aIkesawa et al, 2003Kitamura et al, 2005;Mukoyoshi et al, 2006;Okamoto et al, 2006;Ujiie et al, 2007b, Vrolijk et al, 1988…”

mentioning

confidence: 99%

Deformations and pressure-temperature history of tectonic mélange: Miyama assemblage, the Cretaceous Shimanto Belt, Kii Peninsula, Southwest Japan

Hashimoto¹

2012

Jour. Geol. Soc. Japan

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Co-seismic frictional melting along an out-of-sequence thrust in the Shimanto accretionary complex. Implications on the tsunamigenic potential of splay faults in modern subduction zones

Cited by 61 publications

References 39 publications

Alteration and dehydration of subducting oceanic crust within subduction zones: implications for décollement step-down and plate-boundary seismogenesis

Alteration and dehydration of subducting oceanic crust within subduction zones: implications for décollement step-down and plate-boundary seismogenesis

Experimental investigation of frictional melting of argillite at high slip rates: Implications for seismic slip in subduction‐accretion complexes

Deformations and pressure-temperature history of tectonic mélange: Miyama assemblage, the Cretaceous Shimanto Belt, Kii Peninsula, Southwest Japan

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