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, co-seismic 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 spectro-scopy, 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 Tmelthas only as yet been estimated.
Evidence of dmisteinbergite (hexagonal form of CaAl2Si2O8) in pseudotachylyte: A tool to constrain the thermal history of a seismic event / Nestola, F.; Mittempergher, S.; Toro, G. D.; Zorzi, F.; Pedron, D.. - In: THE AMERICAN MINERALOGIST. - ISSN 1945-3027. - 95:2-3(2010), pp. 405-409.
Data di pubblicazione: | 2010 |
Titolo: | Evidence of dmisteinbergite (hexagonal form of CaAl2Si2O8) in pseudotachylyte: A tool to constrain the thermal history of a seismic event |
Autore/i: | Nestola, F.; Mittempergher, S.; Toro, G. D.; Zorzi, F.; Pedron, D. |
Autore/i UNIMORE: | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.2138/am.2010.3393 |
Rivista: | |
Volume: | 95 |
Fascicolo: | 2-3 |
Pagina iniziale: | 405 |
Pagina finale: | 409 |
Codice identificativo ISI: | WOS:000274509000022 |
Codice identificativo Scopus: | 2-s2.0-77950252991 |
Citazione: | Evidence of dmisteinbergite (hexagonal form of CaAl2Si2O8) in pseudotachylyte: A tool to constrain the thermal history of a seismic event / Nestola, F.; Mittempergher, S.; Toro, G. D.; Zorzi, F.; Pedron, D.. - In: THE AMERICAN MINERALOGIST. - ISSN 1945-3027. - 95:2-3(2010), pp. 405-409. |
Tipologia | Articolo su rivista |
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