The crustal structure of the Campania continental margin is synthesised from outcrop, seismic reflection and gravimetric data. Outcrop and subsurface geologic data reveal the presence of NE-SW faults, E-W faults and NW-SE faults. An older extensional event occured along NW-SE faults and was followed by the main extensional event linked to the activity of NE-SW normal faults. The latter were active between 700 and 400 ka producing half-grabens filled by more than 5 km of Quaternary deposits. The stratigraphic signature of these tectonic events corresponds to a Lower Pleistocene marine unconformity-bounded unit overlain by a Middle Pleistocene transgressive-regressive cycle. A crustal section of the Campania margin displays an asymmetric linked fault system characterized by a 10-12 km-deep main detachement level, listric normal faults and rollover anticlines. Structural and stratigraphic data document that the inception of volcanic activity at Vesuvius occured 400 ka, just after the main extensional event, and the volcano position is at the margin of a rollover anticline.
Tectonics and crustal structure of the Campania continental margin: relationships with volcanism
2003
Abstract
The crustal structure of the Campania continental margin is synthesised from outcrop, seismic reflection and gravimetric data. Outcrop and subsurface geologic data reveal the presence of NE-SW faults, E-W faults and NW-SE faults. An older extensional event occured along NW-SE faults and was followed by the main extensional event linked to the activity of NE-SW normal faults. The latter were active between 700 and 400 ka producing half-grabens filled by more than 5 km of Quaternary deposits. The stratigraphic signature of these tectonic events corresponds to a Lower Pleistocene marine unconformity-bounded unit overlain by a Middle Pleistocene transgressive-regressive cycle. A crustal section of the Campania margin displays an asymmetric linked fault system characterized by a 10-12 km-deep main detachement level, listric normal faults and rollover anticlines. Structural and stratigraphic data document that the inception of volcanic activity at Vesuvius occured 400 ka, just after the main extensional event, and the volcano position is at the margin of a rollover anticline.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
