Planar deformation features in shocked quartz; a transmission electron microscopy investigation
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Cited by (92)
On amorphization as a deformation mechanism under high stresses
2022, Current Opinion in Solid State and Materials ScienceCitation Excerpt :The origin of diaplectic glass was discussed as a reversion product of a dense high-pressure polymorph [33] e.g. stishovite in the case of quartz, or as a result of heterogeneous deformation in the mixed phase regime (Fig. 1) indicated by the Hugoniot [46]. Transmission electron microscopy (TEM) studies of PDFs from natural impact sites revealed that, except those in the basal plane which consist in Brazil twins, unaltered PDFs are in fact amorphous lamellae [153,154]. The amorphous nature of PDFs was established without ambiguity in experimentally shocked quartz [47,48,49,73] showing that PDFs occur frequently in orientations perpendicular to the shock front (Fig. 2b).
Stress and strain during shock metamorphism
2021, IcarusCitation Excerpt :However, for as long as shock metamorphic effects have been identified, geologists have been interested in the potential for them to provide information on deviatoric stresses and strains during shock wave passage and more particularly relating deformation to the orientation of the shock wave. Examples of shock deformation effects that have been linked to the orientation of a shock wave include: shatter cones (Dietz, 1947, 1967; Dietz and Butler, 1964; Gash, 1971; Milton, 1977; Roddy and Davis, 1977; Milton et al., 1996a), feather features (FFs) (Poelchau and Kenkmann, 2011; Ebert et al., 2020), mineral twinning (Schedl, 2006; Timms et al., 2012, 2017a, 2017b, 2019; Erickson et al., 2016; Cox et al., 2018; Kovaleva and Habler, 2019; Kovaleva et al., 2020), solid-state phase transformations (Leroux et al., 1999; Cavosie et al., 2015; Erickson et al., 2017; Timms et al., 2017a), planar fractures (PFs) (Trepmann, 2008; Agarwal et al., 2016; Rae et al., 2019b; Pittarello et al., 2020), mineral kinking (Hörz and Ahrens, 1969; Graup, 1978; Dressler, 1990; Agarwal et al., 2019; Ebert et al., 2021), basal planar deformation features (PDFs) in quartz (McLaren et al., 1967; Trepmann and Spray, 2006; Trepmann, 2008; Ebert et al., 2021), PDFs in quartz and feldspar generally (Goltrant et al., 1991, 1992; Pittarello et al., 2020), and strain markers such as flattened chondrules in meteorites (Nakamura et al., 1995, 2000). Linking shock metamorphic features to the orientation of a shock wave almost always uses a number of assumptions that simplify the geometry and conditions of the shock wave.
Geophysical and structural criteria for the identification of buried impact structures, with reference to Australia
2013, Earth-Science ReviewsCitation Excerpt :TEM studies indicate Qz/PDFs are either amorphous or composed of quartz with low dislocation densities. By contrast planar features described as Qz/MDL are more commonly altered and display high dislocation densities (Goltrant et al., 1991). Qz/PDFs in SEM–Cathode Luminescence form straight, narrow, well-defined features, whereas tectonic deformation lamellae are thicker and slightly curved (Hamers and Drury, 2011).
geophysical anomalies and quartz microstructures, eastern warburton basin, north-east south australia: Tectonic or impact shock metamorphic origin?
2013, TectonophysicsCitation Excerpt :Grieve et al. (1996, Table 1, p. 189), elaborating on Robertson et al.'s (1968) classification, consider an r plane as a Type C Qz/PDF that can correlate with shock pressures of 15 GPa (Grieve et al., 1996, p. 190). Further analysis of the Warburton Qz/PEs that are characterised in TEM indicates that their irregular planar edges (Fig. 13D) are quite unlike published TEM images of glass-bearing or {0001} Brazil twin lamellae, although sharp edges for other orientations are reported by Goltrant et al. (1991). The narrowness (1 μm) of the Warburton structures (Fig. 13) could be an indication that they are PDFs and not Bohm lamellae.
Dynamic fragmentation of natural ceramic tiles: Ejecta measurements and kinetic consequences
2013, International Journal of Impact EngineeringCitation Excerpt :Applications for impact testing include evaluating the ballistic performance of ceramic-metal shielding systems [31–35] and simulating colliding planetary bodies in small-scale laboratory experiments [36–39]. This research has yielded valuable information on the mechanisms governing fragmentation through the predominantly qualitative post-experiment analysis of fragments [13–15,18], and the examination of fracture surfaces using, for example, scanning electron microscopy [18] and transmission electron microscopy [40,41]. Real-time measurements of the dynamic fragmentation of brittle materials have been studied less due to the difficulty of collecting measurements (e.g., time resolution, triggering) [42,43].
Zircon Microstructures in Large, Deeply Eroded Impact Structures and Terrestrial Seismites
2023, Journal of Petrology