Pseudotachylyte generated in the semi-brittle and brittle regimes, Bench Canyon shear zone, central Sierra Nevada
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Cited by (48)
Fault zone structures and strain localization in clinoptilolite-tuff (Nižný Hrabovec, Slovak Republic)
2020, Journal of Structural GeologyCitation Excerpt :The intensity of fragmentation, crushing and comminution increases towards the fault core, within which intense grain size reduction forms narrow bands of ultracataclasites associated with the principal slip surfaces (PSS; e.g. Sibson, 1977; Chester and Chester, 1998; Smith et al., 2011). The preservation of pseudotachylites (e.g. Spray, 1987; McNulty, 1995; Di Toro and Pennacchioni, 2005) and more controversial structures such as polished and mirror-like slickensides (Fondriest et al., 2013; Siman-Tov et al., 2015; Kuo et al., 2016; Pozzi et al., 2018) and/or truncated grains (Smith et al., 2011; Fondriest et al., 2013; Kuo et al., 2016) probably suggests that earthquakes occurred along these structures. Weak faults (Collettini et al., 2019) record a more distributed deformation and result from, for example, dissolution-precipitation creep and mineral replacement reaction-assisted fault weakening.
Polyphase ductile/brittle deformation along a major tectonic boundary in an ophiolitic nappe, Alpine Corsica: Insights on subduction zone intermediate-depth asperities
2017, Journal of Structural GeologyCitation Excerpt :Such a mixing is particularly obvious in the mylonitic sole and associated secondary shear zones where both pre- and post-mylonitization pseudotachylyte veins are preserved. Similar co-occurrences of aseismic plastic/seismic brittle structures are reported from various settings (Sibson, 1980; Passchier, 1982; Hobbs et al., 1986; McNulty, 1995; Lin et al., 2003; Zechmeister et al., 2007). Various mechanisms were proposed to account for this co-occurrence, among which the most often invoked are propagation of the seismic rupture downwards through the plastosphere (e.g., Sibson, 1980) and thermal shear instabilities (e.g., Hobbs et al., 1986).
Subduction zone intermediate-depth seismicity: Insights from the structural analysis of Alpine high-pressure ophiolite-hosted pseudotachylyte (Corsica, France)
2016, Journal of Structural GeologyCitation Excerpt :Cataclasis may predate or postdate frictional melting, as shown by cataclasite zones crossed by pseudotachylyte veins or by fragments of pseudotachylyte included in cataclasites. Similar pseudotachylyte-cataclasite associations were reported from natural occurrences (Maddock, 1992; Magloughlin, 1992; Swanson, 1992; McNulty, 1995; Obata and Karato, 1995; Curewitz and Karson, 1999; Fabbri et al., 2000; Rowe et al., 2005; Di Toro and Pennacchioni, 2004, 2005; Piccardo et al., 2007, 2010) and also from rock friction experiments (Spray, 1995; Del Gaudio et al., 2009; Hirose et al., 2012). Swanson (1992) considered the cataclasite as the result of the propagating seismic rupture front, frictional melting occurring during seismic slip behind the front.
Multiple generations of pseudotachylyte in the Wenchuan fault zone and their implications for coseismic weakening
2015, Journal of Structural GeologyCrustal structure of the Indus-Tsangpo suture zone and its ophiolites in southern Tibet
2015, Gondwana ResearchCitation Excerpt :During the interseismic periods, rocks were deformed in a ductile manner, and quartz crystallized and grew from the matrix of the pseudotachylyte with its c-axis parallel to the stretching lineation. This type of quartz fabrics may also be formed by solution-precipitation as slickenfibers in fault planes and fibrous veins or pressure shadows, and it is thus very common in semi-brittle metamorphic rocks (e.g., Stallard and Shelley, 1995; Speckbacher et al., 2013; McNulty, 1995). On the other hand, the quartz c-axis fabrics in samples XYL 3-5-8-1, XYL 3-5-14-1 and XYL 3-5-18-1 display the maximum concentration of c-axes subperpendicular to the foliation that can be explained by the operation of (0001) < a> slip under low-grade conditions (i.e., 300–400 °C).
Disappearing ink: How pseudotachylytes are lost from the rock record
2013, Journal of Structural Geology