Mesostructural analysis in a conglomeratic deposit along the Mt. Castello - Mt. Cardosa normal fault zone in the southern Umbria-Marches Apennines (central Italy)
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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investigation present a N-S to N20°E extension direction: the N-S extension direction is younger than the N60°E one, no longer active after sedimentation.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 strength.
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