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http://hdl.handle.net/2122/5906
Authors: | Nestola, F.* Mittempergher, S.* Di Toro, G.* Pedron, Danilo* |
Title: | Evidence of dmisteinbergite (hexagonal form of CaAl2Si2O8) in pseudotachylyte: A tool to constrain the thermal history of a seismic event | Journal: | American Mineralogist | Series/Report no.: | 2-3/95 (2010) | Publisher: | American Mineralogist | Issue Date: | 2010 | DOI: | 10.2138/am.2010.3393 | Keywords: | earthquakes pseudotachylytes |
Subject Classification: | 04. 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. |
Appears in Collections: | Article published / in press |
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File | Description | Size | Format | |
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Nestola_et_al_dmisteinbergite.pdf | article | 3.2 MB | Adobe PDF | View/Open |
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