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| Titel |
Lithological controls on the frictional behavior of a seismically active, upper crustal carbonate fault |
| VerfasserIn |
Rachael Bullock, Nicola de Paola, Bob Holdsworth |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250072211
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| Zusammenfassung |
| The Gubbio normal fault (1984, Mw = 5.6) is an active segment of the Umbria Fault System
in the northern Apennines of Italy. It has accumulated >2 km of displacement since the
Lower Miocene. We have studied a well-exposed section through the footwall of the fault,
where rocks have been exhumed from 2.5-3 km. The protolith comprises two thinly-bedded
(beds ~2-20 cm thick) limestone members of the mid-Cretaceous Scaglia Rossa formation.
The first is a pale yellow, micritic limestone with interbedded clay layers 5-100 mm thick.
The second is a red, marly limestone also with thin (2-10 mm) partings of clay between
beds.
The majority of displacement is concentrated within a fault core ~15 m wide, which can
be split into four structural domains (D1-D4), delimited by four major faults (F1-F4). In
D1-D3, derived from the micritic limestone, rocks are heavily brecciated and slip is confined
mainly to principal slip surfaces. Microstructural analysis reveals shear localization zones
(Y-shears), |
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