The Calabrian Orocline: buckling of a previously more linear orogen

Johnston, Stephen T.; Mazzoli, Stefano

doi:10.1144/sp327.7

Cited by 28 publications

(23 citation statements)

References 52 publications

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“…Our structural data (Fig. 11) as well as available regional information from Cilento Group strata exposed in the Lucania region (Cello and Mazzoli, 1998;Mazzoli, 1998b;Cesarano et al, 2002;Zuppetta et al, 2004) suggest that Tortonian deformation of the Cilento Group and third-phase folding of the underlying Ligurian accretionary complex units occurred as a result of dominant NE-SW shortening, and are therefore consistent with the general late Miocene to Pleistocene tectonic evolution of the Southern Apennines, dominated by NE-directed thrusting (e.g., Johnston and Mazzoli, 2009, and references therein). Concerning the Monte Pruno Formation, its age (lower Langhian), deformation style, poles to bedding distribution (resulting from folding around a WNW-tending fold axis; cf.…”

Section: Discussionsupporting

confidence: 60%

“…This was completely unrelated with the NE vergence of the Apennine thrust belt during later development of the Apennine-Calabrian-Sicilian arcuate orogen. The latter process occurred in the early late Miocene (Tortonian; e.g., Patacca and Scandone, 1989;Monaco et al, 1996;Patacca and Scandone, 2007;Johnston and Mazzoli, 2009;Spina et al, 2011, and references therein).…”

Section: Discussionmentioning

confidence: 99%

“…1) and Africa-Eurasia plate convergence (Mazzoli and Helman, 1994). These processes were accompanied by coeval backarc extension in the Tyrrhenian Sea (Kastens et al, 1988;Sartori, 2003) and resulted in signifi cant arching of a formerly rectilinear belt (e.g., Faccenna et al, 2001Faccenna et al, , 2004Johnston and Mazzoli, 2009). Therefore, Apennine-Tyrrhenian geodynamics have signifi cantly modifi ed the preexisting-and much less investigated-tectonic setting.…”

Section: Introductionmentioning

confidence: 99%

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On the tectonic evolution of the Ligurian accretionary complex in southern Italy

Ciarcia

Mazzoli

Vitale

et al. 2011

Geological Society of America Bulletin

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Unraveling the deformation pattern characterizing the transition from the final oceanic subduction stages to the early stages of deformation of the foreland continental margin is crucial for a better understanding of geodynamic processes taking place at convergent plate boundaries. In particular, the combined role of internal wedge dynamics and continental margin architecture in controlling the tectonic evolution of an accretionary complex during its final emplacement onto the foreland continent is discussed in this study. To this purpose, integrated structural, stratigraphic and low-T thermochronometric analyses have been performed on the Ligurian accretionary complex units exposed in the Campania region (Italy) and on continental margin successions located in their footwall, as well as on related foredeep and wedge-top basin deposits. Our results point out a series of late Early Miocene (Burdigalian) shortening events, also involving buttressing of the accretionary wedge against the crustal ramp of the foreland continental margin. Emplacement of the overthickened accretionary complex onto the distal part of the continental margin was followed by horizontal extension and wedge thinning, aiding the development of wedge-top depocenters. Extension may be either related with reduced subduction rates during the Middle Miocene, or with a period of subduction erosion (known to have occurred in the northern Apennines in the same time frame). Early Miocene NW-SE shortening recorded by Ligurian accretionary complex units is completely unrelated with later (Late Miocene to Pleistocene) NE-directed thrusting in the Apennines, which was coeval with back-arc extension in the Tyrrhenian Sea. Therefore, our results emphasize the occurrence of a major discontinuity in the Neogene geodynamic evolution of the southern Apennines, whose tectonic history may be clearly subdivided, from a kinematic point of view, into pre- and syn-Tyrrhenian back-arc extension stages

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Section: Discussionsupporting

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the tectonic evolution of the Ligurian accretionary complex in southern Italy

Ciarcia

Mazzoli

Vitale

et al. 2011

Geological Society of America Bulletin

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“…These processes were accompanied by coeval back‐arc extension in the Tyrrhenian Sea (Kastens et al ., ; Sartori, ) and resulted in significant arching of a formerly rectilinear belt (e.g. Faccenna et al ., , ; Johnston & Mazzoli, ). Global positioning system geodesy (D'Agostino & Selvaggi, ) indicates that rapid SE‐ward motion of Calabria has stopped.…”

Section: Introductionmentioning

confidence: 99%

The Pliocene‐Quaternary wedge‐top basins of southern Italy: an expression of propagating lateral slab tear beneath the Apennines

et al. 2011

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In recent years, contrasting seismic tomographic images have given rise to an extensive debate about the occurrence and implications of migrating slab detachment beneath southern Italy. One of the most pertinent aspects of this process is the concentration of the slab pull force, and particularly its surface expression in terms of vertical motions and related basin subsidence/uplift. In this study we focused on shallow-water to continental, Pliocene-Quaternary basins that formed on top of the Apennine allochthonous wedge after its emplacement onto a large foreland carbonate platform domain (Apulian Platform). Due to the thick-skinned style of deformation controlling the Pliocene- Pleistocene stages of continental shortening, a high degree of coupling with the downgoing plate appears to characterize the late tectonic evolution of the southern Apennines. Therefore, the wedgetop basins analysed in this study, although occurring on the deformed edge of the overriding plate, are capable of recording deep geodynamic processes affecting the slab. Detailed stratigraphic work on these wedge-top basins points to a progressive SE-ward migration of basin subsidence from c. 4 to c. 2.8 Ma over a distance of about 140 km along the strike of the Apennine belt. Such a migration is consistent with a redistribution of slab-pull forces associated with the progressive lateral migration at a mean rate in the range of 12–14 cm y–1 of a slab tear within the down-going Adriatic lithosphere. These results yield fundamental information on the rates of first-order geodynamic processes affecting the slab, and on related surface response

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“…Indeed, significantly reduced or even negligible rates of southeastward motion of Calabria characterize the last 1 m.y. (Mattei et al, 2007;Johnston and Mazzoli, 2009), while GPS geodesy indicates that rapid southeastward motion of Calabria has stopped (D' Agostino and Selvaggi, 2004). Cessation of subduction (e.g., Westaway, 1993) is consistent with the observation that slow convergence across the Africa-Eurasia plate boundary (Mazzoli and Helman, 1994) is presently accommodated along a seismic belt dominated by thrust faulting offshore northern Sicily (e.g., Billi et al, 2007), rather than at the thrust front.…”

Section: Tectonic Implicationsmentioning

confidence: 99%

Quaternary deformation in SE Sicily: Insights into the life and cycles of forebulge fault systems

et al. 2015

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Integrated geological, geomorphological, and differential interferometry synthetic aperture radar (DInSAR) data are used to constrain the\ud timing and modes of activity of Quaternary fault systems in the Hyblean Plateau. This area, which represents a unique natural laboratory\ud for studying surface deformation in relation to deep slab dynamics, has grown since middle Miocene times as a doubly plunging forebulge\ud associated with slab rollback during NW-directed subduction. Bimodal extension has produced two mutually orthogonal normal fault systems.\ud The detailed stratigraphic record provided by synrift sediments and postrift marine terraces allowed us to define the timing of activity\ud of an early Pleistocene, flexure-related fault system, thus constraining the duration of a typical foreland extensional tectonic event to\ud ~1.5 m.y. Subsequent late Quaternary to present deformation was dominated by strike-slip faulting associated with NW-oriented horizontal\ud compression. During this latest stage, regional uplift progressively increased toward the thrust front to the NW and was accompanied by\ud differential uplift accommodated by dip-slip components of motion along active NNW-trending faults. The general active tectonic setting of\ud the study area, characterized by NW-oriented horizontal compression consistent with major plate convergence, and the regional uplift pattern\ud can both be explained within the framework of intraplate shortening and foreland rebound following complete slab detachment, a major\ud geodynamic event interpreted to have taken place at ca. 0.7 Ma in southern Italy

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The Calabrian Orocline: buckling of a previously more linear orogen

Cited by 28 publications

References 52 publications

On the tectonic evolution of the Ligurian accretionary complex in southern Italy

On the tectonic evolution of the Ligurian accretionary complex in southern Italy

The Pliocene‐Quaternary wedge‐top basins of southern Italy: an expression of propagating lateral slab tear beneath the Apennines

Quaternary deformation in SE Sicily: Insights into the life and cycles of forebulge fault systems

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