Slip Behavior of a Subduction Zone: Preliminary Inferences From Quartz and Calcite Filled Veins (Hydrofractures) in an Exhumed Accretionary Wedge, Shimanto Belt, Japan

Elliott, Sara J.; Fisher, Donald M.; Ukar, Estibalitz; Ramirez, Gabrielle; Forstner, Stephanie

doi:10.1130/abs/2017am-306581

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“…Fossil megathrusts or splay faults show pervasive veins interpreted as cyclic hydrofractures formed and cemented at seismogenic depths within the plate interface (Vrolijk et al, 1988;Brantley et al, 1997;Matsumura et al, 2003;Kondo et al, 2005;Vannucchi et al, 2010;Hashimoto et al, 2012) and within the time scales associated with the recurrence of low-frequency slip instabilities (Fisher and Brantley, 2014). Another common characteristic within these fossil megathrusts and splay faults is the sheared, stratally disrupted nature of the host rock where scaly fabric is developed within the matrix (Byrne, 1984;Vannucchi et al, 2010;Elliott et al, 2017;Ramirez et al, 2017). Since each hydrofracturing event is accompanied by an increment of simple shear, the crack openings recorded by veins are a direct response to slip on adjacent microfaults within the rock matrix (Fisher and Brantley, 2014).…”

Section: Introductionmentioning

confidence: 99%

Scaly fabric and slip within fault zones

Vannucchi

2019

Geosphere

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Scaly fabric was first described early in the development of geology and has experienced a recent renaissance with the realization that it may play a key role in the shallow coseismic deformation of plate boundary faults, such as the M9 Tohoku-Oki megathrust event. The fabric itself is an anastomosing network of polished surfaces. It is often present in clay-rich sediments deformed by pure and/or simple shear. The faults where it is found typically have multiple modes of slip, from creep to tremor to seismic slip. It is a macroscopic, multi-scale structure that has, to date, been impossible to create under laboratory conditions. In this paper, I review the state of the art of our understanding of this fabric, its mechanical modes of deformation, and its capacity for both aseismic and seismic slip. I also summarize the challenges we face to understand its full importance in the evolution of plate boundary faults. The conclusion is that scaly fabric is linked to frictional-viscous shear zones where bulk viscous deformation is accompanied by localized shear-a condition typical of frictional transition zones in faults.

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Section: Introductionmentioning

confidence: 99%

Scaly fabric and slip within fault zones

Vannucchi

2019

Geosphere

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Slip Behavior of a Subduction Zone: Preliminary Inferences From Quartz and Calcite Filled Veins (Hydrofractures) in an Exhumed Accretionary Wedge, Shimanto Belt, Japan

Cited by 1 publication

References 0 publications

Scaly fabric and slip within fault zones

Scaly fabric and slip within fault zones

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