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Authors: Nestola, F.* 
Mittempergher, S.* 
Di Toro, G.* 
Title: First evidence of hexagonal anorthite in pseudotachylyte: a new tool to constrain the thermal history during a seismic event
Issue Date: 2010
Keywords: earthquakes
Subject Classification04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous 
Abstract: The determination of the maximum temperature achieved by friction melt (Tmelt) in pseudotachylyte-bearing 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 CaAl2Si2O8 (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 Tmelt has only as yet been estimated.
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