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Pittarello, Lidia (2009) Study of exhumed paleo-seismic fault as a gauge to estimate earthquake source parameters. [Ph.D. thesis]

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Abstract (english)

Exhumed faults decorated by pseudotachylyte, solidified friction induced melt recording a seismic rupture (Sibson, 1975), might give information about the earthquake source. Two cases, representative of different seismogenic environments have been investigated: the pseudodotachylyte-mylonite association in the lower crust, in the Ivrea Zone metagabbros, and the “upper crust” pseudotachylytes in the Tertiary Adamello granitoid batholith.
In metagabbros, a cyclical and coeval production of frictional melts and high temperature localized ultramylonites, during amphibolite metamorphic conditions, has been documented.
From a selected pseudotachylyte in the Adamello batholith the earthquake energy budget has been estimated, concluding that the most energy was dissipated as frictional heat. The thermal evolution of a frictional melt was modeled, demonstrating that the pristine cataclastic structure used for the component of the surface energy estimation might locally have been preserved.

Abstract (italian)

Faglie esumate sigillate da pseuotachiliti, fusi di frizione solidificati che registrano una rottura sismica (Sibson, 1975), possono fornire informazioni sulla sorgente del terremoto. Sono stati studiati due casi rappresentativi di ambienti simogenetici differenti: l’associazione pseudotachiliti-miloniti nella corsta inferiore, nei metagabbri della Zona d’Ivrea e le pseudotachiliti della “crosta superiore” nel batolite granitoide terziario dell’Adamello.
Nei metagabbri è stata documentata la produzione ciclica e contemporanea di fusi di frizione e ultramiloniti localizzate di alta temperatura, entrambe prodotte in facies anfibolitica.
Studiando una pseudotachilite prescelta dal batolite dell’Adamello, si è stimato il bilancio energetico di un terremoto, concludendo che la maggior parte dell’energia si è dissipata sotto forma di calore di frizione. Infine si è modellizzata l’evoluzione termica di un fuso di frizione, dimostrando che l’originaria struttura cataclastica usata per stimare il contributo dell’energia di superficie può potenzialmente essersi localmente preservata.

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EPrint type:Ph.D. thesis
Tutor:Pennacchioni, Giorgio
Supervisor:Di Toro, Giulio
Ph.D. course:Ciclo 20 > Corsi per il 20simo ciclo > SCIENZE DELLA TERRA
Data di deposito della tesi:27 January 2009
Anno di Pubblicazione:02 February 2009
Key Words:pseudotachylyte, metagabbros, earthquake energy, thermal evolution
Settori scientifico-disciplinari MIUR:Area 04 - Scienze della terra > GEO/03 Geologia strutturale
Struttura di riferimento:Dipartimenti > pre 2012 -Dipartimento di Geologia, Paleontologia e Geofisica
Codice ID:1445
Depositato il:27 Jan 2009
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