The Ligurian Units of Western Tuscany (Northern Apennines): insight on the influence of pre-existing weakness zones during ocean closure

Nirta, Giuseppe; Principi, Gianfranco; Vannucchi, Paola

doi:10.3166/ga.20.71-97

Cited by 16 publications

(19 citation statements)

References 68 publications

(87 reference statements)

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“…Therefore, the data reported in this article refer to this area, although extensive outcrops of Ligurian units occur also in Southern Tuscany (Nirta et al 2007 and quoted references). The Ligurian units consist of an assemblage of tectonic slices interpreted as tectonic fragments of a Jurassic oceanic area, i.e.…”

Section: Geological Backgroundmentioning

confidence: 86%

“…Contemporaneously, several models of pre- Piccardo et al 2004;Principi et al 2004;Marroni and Pandolfi 2007) and syn-convergence evolution (Daniele and Plesi 2000;Marroni et al 2002;Del Castello et al 2005;Molli et al 2006;Nirta et al 2007;Molli 2008;Vignaroli et al 2008) have been proposed. The various synconvergence models mainly debate the Late Cretaceous-early Tertiary dipping of the Principi and Treves (1984) for the Alps-Apennines geodynamic system during the Late Cretaceous-early Miocene time span (modified from Principi and Treves 1984).…”

Section: Historical Picture Of the Studies On The Ligurian Units Durimentioning

confidence: 98%

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Anatomy of the Ligure-Piemontese subduction system: evidence from Late Cretaceous–middle Eocene convergent margin deposits in the Northern Apennines, Italy

Marroni

Meneghini

Pandolfi

2010

International Geology Review

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In the Northern Apennines, in contrast to the Western Alps and Alpine Corsica, upper structural levels of the Late Cretaceous-middle Eocene subduction complex are still preserved and well exposed. This subduction complex developed in the LigurePiemontese basin since the Late Cretaceous time as a consequence of convergence between the Eurasia and Adria plates. Representative successions of this ancient subduction complex are well preserved in the Ligurian units of the Northern Apennines, where turbidite and mass-gravity deposits showing pristine stratigraphic features are present. Three main domains, represented by different groups of tectonic units, can be identified, each delineating a different domain of the subduction zone. In this article, we first present a brief history of geological research in the Northern Apennines during the last half of the twentieth century and then a comprehensive picture of the stratigraphy and tectonics of the Ligurian units. A new interpretation of the related tectonostratigraphic units is proposed within the conceptual modern geodynamic framework of convergent margins.

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Section: Geological Backgroundmentioning

confidence: 86%

Section: Historical Picture Of the Studies On The Ligurian Units Durimentioning

confidence: 98%

Anatomy of the Ligure-Piemontese subduction system: evidence from Late Cretaceous–middle Eocene convergent margin deposits in the Northern Apennines, Italy

Marroni

Meneghini

Pandolfi

2010

International Geology Review

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“…[] have suggested that late Miocene deformation within this unit has involved northeastward differential translations of the rocks aligned parallel to the Prato‐Sillaro Lineament relative to those situated southeast of it (see stippled green areas in Figure b). The sense of kinematics associated with such differential translations is inconsistent with the suggestion that post‐Miocene deformation along the LSL involved sinistral strike‐slip faulting [ Fazzini and Gelmini , ; Nirta et al ., ; Pascucci et al ., ], leaving the question on the possible kinematics along this segment unresolved. Alternatively, it is possible that the lithological and thickness contrasts at both sides of the LSL do not reflect any displacements along a tectonic contact, but rather represent a boundary between two domains that experienced different exhumation histories.…”

Section: Near‐surface Expression Of Slab Tearingmentioning

confidence: 99%

“…The possibility that post‐Miocene deformation along the LSL was linked to deeper deformation processes associated with the segmentation of the Adriatic lithosphere has been discussed by Nirta et al . []. The lineament coincides with a transitional zone in the pattern of active seismicity [ Eva et al ., ; Elter et al ., ] and with an abrupt orogen‐parallel change in the level of erosion [ Thomson et al ., ].…”

Section: Tectonic Settingmentioning

confidence: 99%

Crustal and upper mantle responses to lithospheric segmentation in the northern Apennines

Rosenbaum

Agostinetti

2015

Tectonics

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Lithospheric tear faults are expected to develop in response to along-strike variations in the rates of slab rollback. However, the exact geometry of such structures and their crustal and upper mantle expressions are still debated. We present an analysis of seismic, structural, and morphological features that possibly represent the expression of lithospheric segmentation in the northern Apennines. Geophysical observations show evidence for the existence of a discontinuity in the lithospheric structure beneath the northern Apennines, characterized by a change in the spatial distribution of intermediate-depth seismicity, along-strike variations in the pattern of crustal seismicity, and a bend in the Moho topography. The near-surface expression of this discontinuity is associated with an abrupt change in the morphology and exhumation history of the northern Apennines in the proximity of the Livorno-Sillaro Lineament. We interpret these features as evidence for incipient tearing of the lithospheric slab beneath the northern Apennines, marking the boundary between domains that underwent contrasting styles of lithospheric deformation, which are either associated with different rates of slab rollback or a transition from underplating to retreat. We suggest that similar types of structures may play a crucial role in the evolution of convergent plate boundaries, allowing segmentation of orogenic belts and facilitating the development of orogenic curvatures. Ultimately, further tearing along such structures could potentially lead to the occurrence of tear-related magmatism and the formation of slab windows.

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“…The transition zone between the NWS and the ECS is almost coincident with the Livorno-Sillaro Line (LSL) (Bortolotti, 1966;Fazzini and Gelmini, 1982;Cerrina Feroni et al, 2001Dellisanti et al, 2008), dated back to Late Cretaceous by Nirta et al (2007). Cerrina Feroni et al (2001) and Boccaletti et al (2010) propose a compressional character for the LSL.…”

Section: Datamentioning

confidence: 95%

An alternative model for the recent evolution of the Northern–Central Apennines (Italy)

Elter

Elter²,

Eva

et al. 2012

Journal of Geodynamics

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The Ligurian Units of Western Tuscany (Northern Apennines): insight on the influence of pre-existing weakness zones during ocean closure

Cited by 16 publications

References 68 publications

Anatomy of the Ligure-Piemontese subduction system: evidence from Late Cretaceous–middle Eocene convergent margin deposits in the Northern Apennines, Italy

Anatomy of the Ligure-Piemontese subduction system: evidence from Late Cretaceous–middle Eocene convergent margin deposits in the Northern Apennines, Italy

Crustal and upper mantle responses to lithospheric segmentation in the northern Apennines

An alternative model for the recent evolution of the Northern–Central Apennines (Italy)

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