Directional dependence of P- and S-wave propagation and polarization in foliated rocks from the Kola superdeep well: Evidence from laboratory measurements and calculations based on TOF neutron diffraction

Fabric Development in a Middle Devonian Intraoceanic Subduction Regime: The Careón Ophiolite (Northwest Spain)

“…Hornblende has a strong crystallographic-preferred orientation or texture, with an orthorhombic symmetry. The [001] direction is parallel to the lineation (X), and (100) planes are parallel to the foliation, while [010] direction defines a maximum centered around the Y-axis and elongated in Z, which correlates well with previous studies of amphibole textures (e.g., Gapais and Brun 1981;Siegesmund et al 1989Siegesmund et al , 1994Kruhl and Huntemann 1991;Barroul and Kern 1996;Ivankina et al 2005;Díaz Azpiroz et al 2007;Tatham et al 2008). Textural analyses from EBSD result in sharper distributions but patterns are equivalent to those obtained using neutron diffraction ( figs.…”

Crystallographic preferred orientations of exhumed subduction channel rocks from the Eclogite Zone of the Tauern Window (Eastern Alps, Austria), and implications on rock elastic anisotropies at great depths

“…Kern et al, 2002;Pros et al, 2003;Ivankina et al, 2005;Ullemeyer et al, 2006;Kern et al, 2008). The unique experiments of Christensen (1974) on mantle rocks confirmed crack influence to pressures of about 1 GPa, and there is evidence from lowpressure measurements that crack influence up to 1 GPa (or more) is valid for other rock types as well (Ullemeyer et al, 2011).…”

“…Most studies on polymineralic rocks were conducted on materials from the upper and lower crust (e.g. Ivankina et al, 2005;Kitamura, 2006;Ullemeyer et al, 2006), or on rocks originating from above and below the continental Moho (e.g. Barruol and Kern, 1996;Pros et al, 2003;Ullemeyer et al 2010;Llana-Fúnez and Brown, 2012).…”

The influence of grain shape and volume fraction of sheet silicates on elastic properties of aggregates: Biotite platelets in an isotropic matrix

“…Commonly, bulk elastic properties of multiphase polycrystalline rocks are assessed with simple averaging models such as Voigt, Reuss, and Hill, which are not able to account for the effects of grain shapes in the elastic properties (e.g., Ivankina et al, 2005;Kern et al, 2008;Wang et al, 2009). These models perform averaging of single crystal elastic properties of different minerals over their crystal orientation distribution functions (ODFs) that relate the crystal orientations relative to sample coordinates.…”