A petrographic and electron-microprobe study of fault-generated pseudotachylytes from the Outer Hebrides Thrust Zone, Scotland, demonstrates that the textures have resulted from the primary crystallization of a clast-laden melt rather than the devitrification of a glass, or by crushing and cataclasis. The observations are consistent with these pseudotachylytes having formed by frictional fusion followed by rapid quenching—implying faulting at shallow crustal depths.

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