Kinematic indicators recognized on pebble surfaces in a Quaternary fluvio-glacial deposit (presumably Middle Pleistocene in age) placed on the hanging wall of a normal fault belonging to the Mt. Castello-Mt. Cardosa fault zone are described. Fault planes in the bedrock show two different extension directions: N50°-60°E and N-S to N20°E. The aim is to check the consistency of kinematics both along master faults and in Quaternary deposits. The conglomerates under investigation present a N-S to N20°E extension direction: the N-S extension direction is younger than the N60°E one, no longer active after sedimentation. Compressive striae in the conglomerates oriented N-S could have originated in an extensional regime. Cyclic load application during seismic events may have developed these structures by reducing conglomerate shear strength
Mesostructural analysis in a conglomeratic deposit along the Mt. Castello - Mt. Cardosa normal fault zone in the southern Umbro-Marchean Apennines (Central Italy).
INVERNIZZI, Maria Chiara;
1995-01-01
Abstract
Kinematic indicators recognized on pebble surfaces in a Quaternary fluvio-glacial deposit (presumably Middle Pleistocene in age) placed on the hanging wall of a normal fault belonging to the Mt. Castello-Mt. Cardosa fault zone are described. Fault planes in the bedrock show two different extension directions: N50°-60°E and N-S to N20°E. The aim is to check the consistency of kinematics both along master faults and in Quaternary deposits. The conglomerates under investigation present a N-S to N20°E extension direction: the N-S extension direction is younger than the N60°E one, no longer active after sedimentation. Compressive striae in the conglomerates oriented N-S could have originated in an extensional regime. Cyclic load application during seismic events may have developed these structures by reducing conglomerate shear strengthI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
