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The determination of the maximum temperature achieved by friction melt (T melt ) in pseudotachylytebearing faults is crucial to estimate earthquake source parameters (e.g., earthquake energy budgets, coseismic fault strength) on a geological basis. Here we investigated the mineralogy of a pseudotachylyte from the Gole Larghe Fault (Italian Alps) by using X-ray powder diffraction, micro-Raman spectroscopy, and EDS-equipped field emission scanning electron microscopy. In particular, we report the presence of the hexagonal polymorph of CaAl 2 Si 2 O 8  (dmisteinbergite) in a pseudotachylyte. Published experimental work shows dmisteinbergite can crystallize at 1200-1400 °C by rapid quenching. Therefore, the presence of dmisteinbergite in pseudotachylyte could be a reliable geothermometer for friction melts for which T melt  has only as yet been estimated.

Evidence of dmisteinbergite (hexagonal form of CaAl 2 Si 2 O 8 ) in pseudotachylyte: A tool to constrain the thermal history of a seismic event