The Paganica-S. Demetrio-Castelnuovo Basin (PSCB) is a NW-SE trending Plio-Quaternary graben located in the eastern portion of the L'Aquila Basin. The PSCB is the result of the tectonic activity along the main bounding normal fault systems, as evidenced by the 2009 L'Aquila earthquake, the Paganica-San Demetrio Fault System and Barisciano-San Pio Fault in the northeastern side and the Bazzano-Fossa Fault in the southwestern one. Consequently, for seismic hazard purposes, an in-depth PSCB geological study was carried out with the goal to analyse the relationships between the Plio-Quaternary stratigraphy of the basin and the active tectonic setting (Nocentini, 2016). Fine-scale geological field surveys, coupled with paleontological data (freshwater molluscs and ostracods), facies analyses, well-logs and geophysical data interpretation, allowed us to fine tune the PSCB stratigraphy and to review the previously described units or synthems (Bertini & Bosi, 1993; Centamore et al., 2006; Giaccio et al., 2012), resulting in the definition of seven synthems, spanning from late Piacenzian to Holocene. In particular the occurrence of a Caspiocypris species flock at the base of the sedimentary fill of the PSCB, allow us to suggest that the lacustrine deposits of the San Demetrio-Colle Cantaro Synthem could correlate with the late Piacenzian -Gelasian Fosso Bianco Fm of the Tiberino Basin, pointing to a late Piacenzian age for the onset of the extension in the PSCB (Spadi et al., 2016). The lacustrine system disappear at the Gelasian-Calabrian transition and the following evolution of the PSCB was characterized by the presence of fluvial and alluvial fan systems progressively entrenched into the lake deposits. The results of the above mentioned activities are summarised in the presented geological map, where the Plio-Quaternary synthems and the active normal faults accountable for the significant seismicity have been highlighted.
Plio -Quaternary geological map of the Paganica -S. Demetrio -Castelnuovo Basin (L'Aquila, central Italy)
Nocentini M;
2016
Abstract
The Paganica-S. Demetrio-Castelnuovo Basin (PSCB) is a NW-SE trending Plio-Quaternary graben located in the eastern portion of the L'Aquila Basin. The PSCB is the result of the tectonic activity along the main bounding normal fault systems, as evidenced by the 2009 L'Aquila earthquake, the Paganica-San Demetrio Fault System and Barisciano-San Pio Fault in the northeastern side and the Bazzano-Fossa Fault in the southwestern one. Consequently, for seismic hazard purposes, an in-depth PSCB geological study was carried out with the goal to analyse the relationships between the Plio-Quaternary stratigraphy of the basin and the active tectonic setting (Nocentini, 2016). Fine-scale geological field surveys, coupled with paleontological data (freshwater molluscs and ostracods), facies analyses, well-logs and geophysical data interpretation, allowed us to fine tune the PSCB stratigraphy and to review the previously described units or synthems (Bertini & Bosi, 1993; Centamore et al., 2006; Giaccio et al., 2012), resulting in the definition of seven synthems, spanning from late Piacenzian to Holocene. In particular the occurrence of a Caspiocypris species flock at the base of the sedimentary fill of the PSCB, allow us to suggest that the lacustrine deposits of the San Demetrio-Colle Cantaro Synthem could correlate with the late Piacenzian -Gelasian Fosso Bianco Fm of the Tiberino Basin, pointing to a late Piacenzian age for the onset of the extension in the PSCB (Spadi et al., 2016). The lacustrine system disappear at the Gelasian-Calabrian transition and the following evolution of the PSCB was characterized by the presence of fluvial and alluvial fan systems progressively entrenched into the lake deposits. The results of the above mentioned activities are summarised in the presented geological map, where the Plio-Quaternary synthems and the active normal faults accountable for the significant seismicity have been highlighted.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
