Fore-arc Deformation in the Paola Basin Segment (Offshore Western Calabria) of the Tyrrhenian‐Ionian Subduction System

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Abstract

The 3D stratigraphic architecture and Late Neogene to Recent tectonic evolution of the Paola Basin (offshore westernCalabria), a segment in the fore-arc of the Tyrrhenian‐Ionian subduction system, is reconstructed by using a grid ofhigh-penetration reflection seismics. Oligocene to Messinian deposits are interpreted all along the profile. They tend tofossilize preexisting topography and reach the largest thicknesses between (fault controlled) basement highs. Plio‐Quaternary deposits are found over the entire area and display variations in thickness and tectonic style. They arethicken up to 4.5 km in the depocenter of the basin, and decrease both in the east and west termination of the lines.The Paola Basin can be partitioned into two sectors with different tectonic deformation, separated by a NNW-SSEelongated area that coincides with the basin depocenter. Tectonic features associated with strike-slip restraining andreleasing bends are widely spread over the western sector of the basin. Overall, they form an approximately NStrendingand geomorphically prominent ridge separating the Paola Basin from the Marsili abyssal plain. A high-angle,NNE-trending, normal fault system develops on the south-west tip of the basin, where the faults offset the Messinianhorizon of ca. 500 m. Data suggest that limited vertical slip occurs along reverse faults detected at the border andinside the sedimentary infilling of the Paola Basin, reaching thickness of more than 3.8s two way travel time. Thereflection sequence pattern can be interpreted as a result of the infilling of the thrust-top basin related to a progradingsystem, located between a growth ramp-anticline to the west and a culmination of basement-thrust sheets to the East.We propose that the Paola Basin developed near the northern edge of the Ionian slab where tearing of the lithosphereis expected. Also, the strike-slip fault system is a kinematic consequence of obliquely convergent subduction settings,where interplate strain is partitioned into arc-parallel strike-slip zones within the fore-arc, arc or back-arc region.
Lingua originaleEnglish
Numero di pagine1
Stato di pubblicazionePublished - 2017

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