The product of frictional melting of geomaterials is termed “pseudotachylyte”. The name, first coined by Shand (1916), represents the visual similarity to the lava “tachylyte”, being a dark aphanitic rock with a glassy appearance. Pseudotachylytes have been referred to by many names since their first identification, including trap-shotten gneiss (Holland 1900), hyalomylonite (Masch et al. 1985) and frictionite (Maddock 1986), the latter of which is still occasionally used. Controversy remains as to the precise defining characteristics of pseudotachylytes (Magloughlin and Spray 1992; Rowe et al. 2005; Spray 2010) and...

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