Structural style of Quaternary extension in the Crati Valley (Calabrian Arc): evidence in support of an east-dipping detachment fault

Brozzetti, Francesco; Cirillo, Daniele; Liberi, Francesca; Piluso, Eugenio; Faraca, Elena; Nardis, Rita de; Lavecchia, Giusy

doi:10.3301/ijg.2017.11

Cited by 30 publications

(27 citation statements)

References 62 publications

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“…Cross section showing the Plio‐Quaternary sedimentary infill of the Paola and Crati basins, the positions of the main transcurrent fault zone, and the normal faults bordering the Crati Basin. Data were derived from the Line Section and literature data (Brozzetti et al, ; Spina et al, ; Tansi et al, and Van Dijk et al, ). V.E.…”

Section: Discussionmentioning

confidence: 99%

“…Contrasting models have been proposed for explaining the tectonic evolution of forearc basins since the Middle Miocene. They include (1) models highlighting the control exerted extensional tectonics on the formation of Crati and Amantea basins since the Serravallian (Brozzetti et al, ; Cifelli, ; Mattei et al, ; Rossetti et al, ); (2) models proposing extensional tectonics, interrupted by compressional or transpressional events, to explain the tectonostratigraphic evolution of the Paola Basin (Milia et al, ), Crati Basin (Knott & Turco, ; Turco et al, ), Crotone Basin (Massari et al, ; Van Dijk , ; Zecchin et al, a), and Squillace Basin (Capozzi et al, ); (3) models considering shortening responsible for the formation of the wide and deep Paola syncline (Argnani & Trincardi, ; Pepe et al, ) and piggyback or perched basins in the frame of the eastward migrating Apennine compressional phases (Cesarano & Turco, ; Monaco et al, ; Perri, ); and (4) models highlighting the importance of NW‐SE trending left lateral regional crustal shear zone in the developing of transtensional basins, such as the Crati Basin, since the Early Pleistocene (Lanzafame & Tortorici, ; Spina et al, ; Tansi et al, ).…”

Section: Geological Backgroundmentioning

confidence: 99%

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3‐D Architecture and Plio‐Quaternary Evolution of the Paola Basin: Insights Into the Forearc of the Tyrrhenian‐Ionian Subduction System

et al. 2020

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Using seismic reflection profiles and bathymetric data, we analyzed the stratigraphy and tectonics of the Paola Basin, providing information on the dynamic of the forearc of the Tyrrhenian-Ionian subduction system. The Paola Basin is a NNW-SSE trending syncline, bounded by the Coastal Chain to the east and the Paola Anticline to the west. It hosts up to 5.2 km thick Plio-Quaternary deposits, most of them supplied from Apenninic/Sila entry points and transported by longshore currents. The total subsidence reaches a value of ∼5 km. The sedimentary load varies from 60% to 75% of the total subsidence. The Pliocene to Lower Pleistocene sedimentary infill of the syncline displays a strata growth geometry consistent with a continuous rotation of the eastern limb of the Paola Anticline. Crustal folding can explain both the tectonic subsidence of the Paola Basin and the uplift of the Paola Anticline. To the east of the basin, Late Pliocene to Early Pleistocene growth of the central sector of the Coastal Chain led to the definition of the Paola and Crati basins, previously connected in a larger proto basin. The trench-parallel component of the plate movement was accommodated by a strike-slip zone, with associated releasing and restraining bends coinciding with the Paola Anticline. The bathymetric expression of the strike-slip zone consists of structural highs and depressions that overall form the Paola Ridge. Since the Middle Pleistocene, the growth of the Paola Anticline and Paola Basin came to an end and extensional tectonics controlled the evolution of the forearc region.

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Section: Discussionmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

3‐D Architecture and Plio‐Quaternary Evolution of the Paola Basin: Insights Into the Forearc of the Tyrrhenian‐Ionian Subduction System

et al. 2020

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“…Antithetic thrusting is not widely reported in the Apennines and the SW vergence of the Raganello fault is likely related to an unusual late-stage circumstance such as the Pleistocene tectonic crisis of Calabria. This crisis includes CW rotation and longitudinal 10.1029/2017TC004932 Tectonics extension of the forearc, both of which are thought to have contributed to the opening of the Crati-Sibari-Corigliano trough (Brozzetti, Cirillo, Liberi, et al, 2017;Cifelli et al, 2007;Reitz & Seeber, 2012;Robustelli & Muto, 2017). The extension related to this trough may be the unusual factor compromising the shallow part of the backstop of the Calabria-Apulia collision.…”

Section: Apenninic Back-thrusting and Pleistocene Longitudinal Extensmentioning

confidence: 99%

The Culmination of an Oblique Time‐Transgressive Arc Continent Collision: The Pollino Massif Between Calabria and the Southern Apennines, Italy

Filice

Seeber

2019

Tectonics

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The Pollino Massif is the most southeastern outcrop of the Apennine core. It marks the transition between Apenninic shortening and extension, respectively, SE and NW of the massif and is also the cusp of a southeastward plunge that characterizes the submerged Apennines. The SE limit of NE‐SW extension merges with the east limit of Tyrrhenian extension in Calabria. This strategic position is expected to transition southeastward in the progressive oblique collision of the Calabrian forearc and Apulia. We test this hypothesis using published results and new field data. The time‐transgressive emergence of basins on the Apennine thrust wedge is quantitatively consistent with the ESE rollback of the Calabrian arc. Specifically, a thrust‐normal slip reversal on a SW dipping fault is responsible for the tectonic collapse that lead to the Mercure Basin along strike NW of the Pollino Massif and to an east‐to‐west reversal of drainage. This reversal is timed by an intermediate stage of trapped internal drainage with Mid‐Pleistocene lacustrine sedimentation, but it may young to SE as the normal displacement on the border fault decreases gradually to SE and vanishes near the apex of the massif. On the SE side of the massif, contractional tectonics persists at least into the Mid‐Pleistocene and likely later, while NE‐SW extension is absent. Prominent normal faults in that area accommodate range‐parallel extension and are coupled with the thrust faults. The combination of longitudinal extension with a counterclockwise rotation of hanging‐wall units and thrust directivity can account for the final setting in the Apennines.

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“…In the project, structural geological, geophysical, and paleoseismological studies were successfully acquired across the Mt. Pollino and Castrovillari fault systems (northern Calabria), supporting evidence of their Late Quaternary activity (Ercoli et al 2013b;Cinti et al 2015Brozzetti et al, 2017b). This area, which is considered one of the most important seismic gaps in southern Italy, extends northward to include the Mercure and Campotenese basins, both characterized by Late Quaternary continental syn-tectonic sedimentation (Fig.…”

Section: Introductionmentioning

confidence: 68%

“…North of Campotenese, (Lucania and southern Campania) the Apennine extensional belt includes several continental basins and their boundary faults, as the Irpinia, Vallo di Diano, Tanagro, Melandro-Pergola and Val d'Agri (Ascione et al 1992;Maschio et al 2005;Amicucci et al 2008;Villani and Pierdominici 2010;Brozzetti 2011;Seeber 2019 andBello et al 2021). To the south, it continues with the Crati graben that dissects the northern sector of the Calabrian Arc (Tortorici et al 1995;Brozzetti et al 2017b). On the regional scale, the Quaternary normal fault array controls the release of major seismicity, as suggested by the distribution of supra-crustal instrumental earthquakes (INGV 2020 andIside 2007) and of the strongest historical events (Fig.…”

Section: Tectonic Setting and Seismicitymentioning

confidence: 99%

GPR signature of Quaternary faulting: a study from the Mt. Pollino region, southern Apennines, Italy

Ercoli

Cirillo

Pauselli

et al. 2021

Preprint

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Abstract. With the aim of unveiling evidence of Late Quaternary faulting, a series of Ground Penetrating Radar (GPR) profiles were acquired across the Campotenese continental basin (Mt. Pollino region) in the southern Apennines active extensional belt (Italy). A set of forty-nine 300 MHz and 500 MHz GPR profiles, traced nearly perpendicular to a buried normal fault, were acquired and carefully processed through a customized workflow. The data interpretation allowed us to reconstruct a pseudo-3D model depicting the boundary between the Mesozoic bedrock and the sedimentary fill of the basin, which were in close proximity to the fault. Once reviewing and defining the GPR signature of faulting, we highlight in our data how near surface alluvial and colluvial sediments appear to be dislocated by a set of conjugate (west and east-dipping) discontinuities that penetrate inside the underlying Triassic dolostones. Close to the contact between the continental deposits and the bedrock, some buried scarps which offset wedge-shaped deposits are interpreted as coseismic ruptures, subsequently sealed by later deposits. Although the use of pseudo-3D GPR data implies more complexity linking the geophysical features among the radar images, we have reconstructed a reliable subsurface fault pattern, discriminating master faults and a series of secondary splays. We believe our contribution provides an improvement in the characterization of active faults in the study area which falls within the Pollino seismic gap and is considered potentially prone to severe surface faulting. Our aim is for our approach and workflow to be of inspiration for further studies in the region as well as for similar high seismic hazard areas characterized by scarcity of near-surface data.

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Structural style of Quaternary extension in the Crati Valley (Calabrian Arc): evidence in support of an east-dipping detachment fault

Cited by 30 publications

References 62 publications

3‐D Architecture and Plio‐Quaternary Evolution of the Paola Basin: Insights Into the Forearc of the Tyrrhenian‐Ionian Subduction System

3‐D Architecture and Plio‐Quaternary Evolution of the Paola Basin: Insights Into the Forearc of the Tyrrhenian‐Ionian Subduction System

The Culmination of an Oblique Time‐Transgressive Arc Continent Collision: The Pollino Massif Between Calabria and the Southern Apennines, Italy

GPR signature of Quaternary faulting: a study from the Mt. Pollino region, southern Apennines, Italy

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