Spider texture and amphibole preferred orientations
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Cited by (40)
Crustal anisotropy and deformation of the southeastern Tibetan Plateau revealed by seismic anisotropy of mylonitic amphibolites
2022, Journal of Structural GeologyCitation Excerpt :These observations suggest that the dominant deformation mechanism of amphibole grains in these samples is not mainly dominated by dissolution-precipitation and intragranular plasticity deformation process. It is generally accepted that amphibole is the least plastic of the diagenetic silicate minerals under crustal conditions (Shelley, 1994), and only at temperatures above 800 °C does amphibole deformation become dominated by intracrystalline plasticity (Huang et al., 2003). Process involving rotation of non-equant amphibole grains in a deforming magma chamber may result in moderate intragranular deformation, and the amphibole content decreases progressively with increasing solid-state deformation to yield more biotite, epidote and quartz (Berger and Stünitz, 1996).
Dissolution precipitation creep as a process for the strain localisation in mafic rocks
2022, Journal of Structural GeologyDevelopment of a synorogenic composite sill at deep structural levels of a magmatic arc (Odenwald, Germany). Part 2: Rheological inversion and mullion formation under bulk constriction
2022, Journal of Structural GeologyCitation Excerpt :At T > 600 °C, a CPO in hornblende might result from dislocation glide along the most favorable slip system (100) [001] (Cao et al., 2010; Gómez Barreiro et al., 2010). However, there is also some evidence that amphibole behaves as a rigid phase, which does not undergo significant crystal-plastic strain even at high temperature (Ildefonse et al., 1990; Shelley, 1994; Berger and Stünitz, 1996; Ko and Jung, 2015), and/or dissolving and reprecipitating during deformation (Berger and Stünitz, 1996; Hacker and Christie, 1990; Kruse and Stünitz, 1999; Marti et al., 2017). The hornblende CPO of the Acebuches amphibolites of the Aracena metamorphic belt is interpreted to result from rigid body rotation of amphibole prisms within the weaker plagioclase matrix.
Stresses during pseudotachylyte formation - Evidence from deformed amphibole and quartz in fault rocks from the Silvretta basal thrust (Austria)
2021, TectonophysicsCitation Excerpt :The higher the distance to the seismic active fault, the more distributed the deformation. During this long-term creep, quartz-rich layers accumulate the higher amount of strain in relation to the amphibole-rich gneisses, consistent with a lower flow strength of quartz related to dislocation creep (e.g., Gleason and Tullis, 1995; Hirth et al., 2001; Luan and Paterson, 1992) as opposed to amphibole (e.g., Berger and Stünitz, 1996; Brodie and Rutter, 1985; Cao et al., 2010; Díaz Aspiroz et al., 2007; Imon et al., 2004; Shelley, 1994). Dislocation glide-controlled deformation of quartz is preferentially occurring in coarse quartz grains as opposed to the fine-grained recrystallized aggregates consistent with the inverse relationship between strength and grain size during dislocation glide, where grain boundaries act as obstacles (e.g., Fredrich et al., 1990; Hall, 1951; Hirth, 1972; Petch, 1953).