The collisional knot in Liguria

Laubscher, H. P.; Biella, G.; Cassinis, R.; Gelati, R.; Lozej, A.; Scarascia, S.; Tabacco, I.

doi:10.1007/bf01828598

Cited by 68 publications

(38 citation statements)

References 6 publications

(7 reference statements)

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“…12B). This tectonic junction (i.e., the "Ligurian knot" of Laubscher et al 1992;Schumacher and Laubscher, 1996) results in a complex tectonic jigsaw (Figs. 1A, 2 and 12B) including the buried metamorphic Western Alpine units, the SE-verging front of the South Alpine thrust system (i.e., Adria Units), and the northeast-verging External Ligurian Units of the Northern Apennines (i.e., the outer part of the Apenninic prowedge) (see, e.g.…”

Section: 3mentioning

confidence: 99%

“…1A, 2 and 12B) including the buried metamorphic Western Alpine units, the SE-verging front of the South Alpine thrust system (i.e., Adria Units), and the northeast-verging External Ligurian Units of the Northern Apennines (i.e., the outer part of the Apenninic prowedge) (see, e.g. Biella et al 1988Biella et al , 1997Laubscher et al 1992;Castellarin 1994;Mutti et al 1995;Roure et al 1996;Schumacher and Laubscher, 1996;Piana 2000;Mosca et al 2010). In the northwestern sector of the studied area (Monferrato and Torino Hill), the SE-ward migration of the South Alpine thrust system is recorded within the upper Eocene -Oligocene succession (Festa et al 2005(Festa et al , 2009Mosca et al 2010).…”

Section: 3mentioning

confidence: 99%

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Late Oligocene–early Miocene olistostromes (sedimentary mélanges) as tectono-stratigraphic constraints to the geodynamic evolution of the exhumed Ligurian accretionary complex (Northern Apennines, NW Italy)

Festa

Ogata

Pini

et al. 2014

International Geology Review

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This is an author version of the contribution published on:Questa è la versione dell'autore dell'opera: Review, v. 57, no. 5-8, 540-562. Doi: 10.1080/00206814.2014. Festa et al. (2015) -International GeologyThe definitive version is available at:La versione definitiva è disponibile alla URL:http://www.tandfonline.com/loi/tigr20 AbstractIn the Northern Apennines of Italy, mud-rich olistostromes (sedimentary mélanges) occur at different stratigraphic levels within late Oligocene -early Miocene sedimentary record of episutural/wedge-top basins. They are widely distributed along the exhumed outer part of the Ligurian accretionary complex, atop of the outer Apenninic prowedge, over an area of about 300 km long and 10-15 km wide. Olistostromes represent excellent examples of ancient submarine mass-transport complexes (MTCs), consisting of stacked cohesive debris flows that can be directly compared with some of those observed in modern accretionary wedges. We describe the internal arrangement of olistostrome occurrences in the sector between Voghera and the Monferrato, analyzing their relationships with mesoscale liquefaction features, which are commonly difficult to observe in modern MTCs. Slope failures occurred in isolated sectors along the wedge front, where out-of-sequence thrusting, seismicity and different pulses of overpressured tectonically-induced fluid flows acted concomitantly. Referring to the Northern Apennines regional geology, we also point out a gradual lateral rejuvenation (from late Oligocene to early Miocene) toward the SE and an increasing in size and thickness of the olistostromes along the strike of the frontal Apenninic prowedge. This suggests that morphological reshaping of the outer prowedge via mass transport processes balanced with different pulses in a short time span the SE-ward migration and segmentation of the accretionary processes. The latter have been probably favored by the occurrence in the northwestern part of the Northern Apennines of major, inherited paleogeographic features controlling the northward propagation of the prowedge. The detailed knowledge of olistostromes, as ancient examples of MTCs related to syn-sedimentary tectonics and shale diapirism, and of their lateral variations in term of age and size, provides useful information for better understanding both the tectono-stratigraphic evolution of the Apenninic prowedge and the submarine slope failures in modern accretionary wedges.

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Section: 3mentioning

confidence: 99%

Section: 3mentioning

confidence: 99%

Late Oligocene–early Miocene olistostromes (sedimentary mélanges) as tectono-stratigraphic constraints to the geodynamic evolution of the exhumed Ligurian accretionary complex (Northern Apennines, NW Italy)

Festa

Ogata

Pini

et al. 2014

International Geology Review

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“…In the Oligocene-Miocene time interval the anticlockwise rotation of the Corsica-Sardinia Block with respect to Eurasia and the related opening of the Ligurian-Provençal Basin gave rise to the oroclinal bending of the Ligurian Alps (Tapponier 1977;Laubscher et al 1992) that were forced to migrate towards E-NE. The resulting tectonic structures achieve the backfolding and backthrusting at the onset of the Apennine stacking and were produced due to the onset of E-W to NE-SW shortening directions .…”

Section: Regional Tectonic Frameworkmentioning

confidence: 99%

Fault‐slip analysis in the metaophiolites of the Voltri Massif: constraints for the tectonic evolution at the Alps/Apennine boundary

et al. 2008

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The metaophiolitic Voltri Massif underwent a complex tectono-metamorphic evolution, resulting from subduction to collision events during the Alpine orogenic cycle, and was subsequently involved in the first stages of the Apennine Orogeny. So this is a key area to investigate the late orogenic Alpine tectonics and its time relationship with the first Apenninic deformation events.We performed detailed mapping, fault-slip analysis and study of fault rocks in a study area located at the eastern border of the Voltri Massif. Here we recognized two main generations of reverse shear zones (RSZ). The first one (RSZ1) is associated to mylonites and protomylonites in greenschist to low-greenschist metamorphic facies and is characterized by a ductile to ductilebrittle behaviour; RSZ1 display either top-to-N-NW or to-SW kinematics. The second generation of reverse shear zones (RSZ2) is characterized by fault breccia, crush breccia or protocataclasite; RSZ2 sense of tectonic transport ranges from top-to-NW, -SW and -NE.RSZ1 structures are locally folded by 10 m-scale, open chevron folds with fold axes gently plunging to SW that likely represent the last phases of deformation during Alpine collision.RSZ2 structures locally reactivate RSZ1, with a more brittle behaviour and produce a huge volume of fault rock. They are coeval with low-greenschist to zeolite-facies metamorphic conditions. The RSZ2 fit a transpressional regime active at the eastern border of the Voltri Massif at least during the late Oligocene-early Miocene.

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“…Several authors have discussed the structural setting of the Alps -Apennine link (Bozzo et al 1992;Laubscher et al 1992;Miletto and Polino 1992); however, as it is poorly exposed and masked by the TPB deposits, many of these papers have addressed this problem by means of geophysical methods. Miletto and Polino (1992) proposed a gravity model, constructed by combining geological data and several geophysical methods.…”

Section: Source Differentation By Tectonicsmentioning

confidence: 99%

Late Alpine tectonics in the Ligurian Alps: constraints from the Tertiary Piedmont Basin conglomerates

et al. 2008

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The Tertiary Piedmont Basin (TPB) is a syn-tectonic Neoalpine–Apennine basin with an upper Eocene–upper Miocene sedimentary succession. It has an inner position with respect to the arcuate belt of the Western and Ligurian Alps, in northwestern Italy. In the area north of Genova, the Scrivia Valley separates two distinct sectors where the TPB basal conglomerates display a differentiated clast provenance: in the western sector conglomerates are fed by the metamorphic units of central Liguria, whereas in the eastern sector most of the conglomerate clasts come from the Antola ﬂysch Unit. Observations on clast lithology demonstrate that the transition between the two types of conglomerates is abrupt and roughly coincides with the Scrivia River Valley. An explanation of the different clast provenance as due to a progressive deepening of the erosional level appears to be possible in the eastern sector, but it is not feasible in the western sector, where the ﬂysch units appear to have been protected from erosion. We propose that the northwards thrusting of the Ligurian Alps metamorphic units onto the Antola ﬂysch units, made the latter not available to erosion and led the Scrivia Fault and other equivalent tectonic lineaments to act as tear faults. Field data suggest that the Tertiary geodynamics of the Ligurian Alps was dominated by the Corsica–Sardinia anticlockwise rotation, that caused the northwards backthrusting of the Ligurian Alps, accommodated by a complex strike-slip fault system, that segmented the TPB, affecting the sedimentation and the clast provenance of the conglomerates

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The collisional knot in Liguria

Cited by 68 publications

References 6 publications

Late Oligocene–early Miocene olistostromes (sedimentary mélanges) as tectono-stratigraphic constraints to the geodynamic evolution of the exhumed Ligurian accretionary complex (Northern Apennines, NW Italy)

Late Oligocene–early Miocene olistostromes (sedimentary mélanges) as tectono-stratigraphic constraints to the geodynamic evolution of the exhumed Ligurian accretionary complex (Northern Apennines, NW Italy)

Fault‐slip analysis in the metaophiolites of the Voltri Massif: constraints for the tectonic evolution at the Alps/Apennine boundary

Late Alpine tectonics in the Ligurian Alps: constraints from the Tertiary Piedmont Basin conglomerates

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