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- I diavoli di via Padova. Cronaca di un inferno annunciato : Matteo Speroni :
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All rights reserved. Remember me on this computer. Cancel Forgot your password? Matteo Speroni. Ombre rosse Milieu Firm , 8. Print book : Fiction : Italian. They pass upward and local laterally to hemipelagic clays and marls of the Monte Piano Marls MMP in the Main Map , Lutetian — Priabonian Figure 3 b,c , which are overlain through an erosive unconformity surface Figure 3 b by turbidites of the Ranzano Formation.
Oligocene-early Miocene tectonic evolution of the Northern Apennines northwestern Italy traced through provenance of piggy-back basin fill successions. Geolocial Society of London, Special Publications , , — Rivista Italiana di Paleontologia e Stratigrafia , 80 , — Micropaleontology , 49 4 , — International Geology Review , 57 , — The stratigraphic contact with Ranzano Formation Colletta sector corresponds to an angular unconformity, which passes laterally to a correlative conformity Case Cucchi sector where the Contignaco Formation overlies the Antognola Formation.
In the latter sector, locally, the lower part of the Contignaco Formation is characterized by slumping structures. Itinerario N8 3. Da Voghera a Tortona Km Guide Geologiche Regionali S. In the northern sector of the studied area, late Messinian post-evaporitic chaotic deposits i. Figure 3.
The tectonic setting is characterized by the ENE-trending of tectonic structures thrusts, strike-slip faults, and regional scale folds , which are rotated to WNW-trending to the West of Curone Valley, being displaced by WNW- to NW-striking strike-slip faults see Main Map and related Structural scheme. The BST, which is splitted into two main sub-parallel surfaces bounding an elongated slice of Argille Varicolori, shows a gradual decrease of offset toward WSW where it is truncated by a NW-striking fault located along the Curone Valley.
Two main fault systems ENE- and N-directed dissect the hanging wall succession. In detail, the latters show transpressive left- and right-lateral movements, respectively Figure 4 a. The N-striking faults show normal kinematics, as outlined by cartographic evidences such as the displacement of stratigraphic contacts among different members of the Monte Piano Marls and the Ranzano Formation see Main Map.
Left-lateral reactivations of this fault system are documented by slickenlines on fault surfaces Figure 4 a. S-C shears are indicated by dotted white line; e isoclinal and transposed folds with fold axes displaying WNW- and ESE-oriented maxima in the Argille Varicolori close to Cascina Galuzia , showing stretching and thinning of the limbs; f block-in-matrix fabric in the Argille Varicolori, showing the alignment of elongated blocks i. Figure 4. The thrust dips to NE and SW in the northeastern and southwestern sides of the tectonic window, respectively, superposing the Scabiazza Sandstone northestern side , the Monte Cassio Flysch and the Scabiazza Sandstone southwestern side onto the Pietra Parcellara Complex see cross section 2 in Main Map.
Along the northeastern side of the tectonic window, the Scabiazza Sandstone is locally involved by thrust splays and imbricated with the Pietra Parcellara Complex, forming lenticular tectonic slices, hundreds of m in length.
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Mesoscale structural associations S—C shears; Figure 4 d and fault striations slikenlines show transpressive right-lateral movements, according to the cartographic displacement of stratigraphic contacts observed in the Map. This deformation zone juxtaposes the Monte Cassio Flysch and the Argille Varicolori to different terms of the Epiligurian Succession i. Far from faults bounding the SDDZ, the Argille Varicolori preserve an earlier layer-parallel extensional block-in-matrix fabric, which is deformed by rootless and transposed folds Figure 4 e,f.
The tectonic setting above described is cut by two main fault systems, NW- and N-striking. The former corresponds to pluri-km long faults, which cut with left-lateral movements, reactivated by right-lateral ones as shown by fault striations slickenlines on fault surfaces Figure 4 a and S—C shears, both the BST and the SDDZ see Main Map.
The N-striking fault system shows best exposures only in the northeaster sector of the studied area East of Mt. The latter defines a hundreds of meters wide deformation zone, with left-lateral kinematics e. The crosscutting relationships between mapped faults and stratigraphic unconformities, and the distinction of different types of chaotic rock unit, allow describing a detailed tectono-stratigraphic evolution of this sector of the Northern Apennines.
Six main tectonic stages have been defined from Late Cretaceous to Pliocene Figure 5 a,b.
I diavoli di via Padova. Cronaca di un inferno annunciato : Matteo Speroni :
Late Cretaceous — Early Eocene : this tectonic stage preserves the record of both gravitational i. Regione Emilia Romagna, C. Polyorogenic deformation history recognized at very shallow structural levels: The case of the Antola Unit Northern Apennines, Italy. Journal of Structural Geology , 28 , — Journal of Structural Geology , 25 , — Journal of Maps , 9 , 84 — 97 , including a geological map at , scale. Although the time for tectonic superposition of the Cassio Unit onto the Groppallo Unit is difficult to constrain because of the lack of a detailed stratigraphic marker, the lack of involvement of Epiligurian Succession suggests it occurred earlier than Middle Eocene time Figure 5 a,b.
Cenomanian — Turonian. This mass-transport event marks an important stage of the regional scale instability of the External Ligurian wedge e. The Northern Apennine, Italy: Geological structure and transpressive evolution. Geological Society of Italy, 15— The uppermost temporal constrain to this tectonic stage is represented by the unconformable deposition of the Ranzano Formation Late Eocene — Early Oligocene onto both the Baiso Argillaceous Breccias and External Ligurian Succession Figure 5 a,b.
At the regional scale, this stage is close associated with faulting along the Villalvernia — Varzi Line, which controlled the depositional settings of both the Tertiary Piedmont Basin and Epiligurian Succession e. Ofioliti , 22 , — Interaction between tectonics and deposition into an episutural basin in the Apls-Apennines knot. Sacchi Eds. Complex bedding geometries and facies associations of the turbiditic fill of a confined basin in a transpressive setting Castagnola FM, Tertiary Piedmont Basin NW Italy.
Sedimentology , 49 , — Polyphase folding at upper structural levels in the Borbera Valley Northern Apennines, Italy : Implications for the tectonic evolution of the linkage area between Alps and Apennines. Comptes Rendus Geoscience , , — Tectonics , 19 , — Oligocene-Neogene kinematic constraints in the retroforeland basin of the Northwestern Apls. The deposition of the Antognola Formation late Rupelian — Aquitanian , which unconformably overlains different terms of the Ranzano Formation and External Ligurian Succession, provides the temporal constrain for this tectonic stage Figure 5 a,b.
Chattian — Early Miocene : the former extensional regime was inverted to a compressional one that accompanied the deposition of the Antognola Formation.
I diavoli di via Padova. Cronaca di un inferno annunciato
This stage is mostly recorded along the MVDZ, developed by the interlacing of ENE-striking transpressive right-lateral faults and E-striking transpressive left-lateral ones, and the widespread occurrence of olistostromes of the Val Tiepido — Canossa Argillaceous Breccias, which sourced from denudation of uplifted External Ligurian Succession and the lower part of Epiligurian Succession.
In the southwestern sector of the study area, submarine structural highs formed during the Middle Eocene — Rupelian stage were sealed by the unconformable deposition of the Contignaco Formation Colletta sector; see cross section 3, Figure 5 a,b. Toward east e. Case Cucchi sector , the occurrence of slumping in the lower part of the Contignaco Formation marks the paleo-scarp connecting the structural highs with a seafloor basinal low, where the unconformity surface at the base of the Contignaco Formation passes gradually to a correlative conformity.
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A second pulse of gravitational instability occurred in the Burdigalian — Langhian? This tectonic stage was definitively sealed by the Monte Vallassa Sandstone, which unconformably overlain faults associated with the MVDZ Figure 5 a,b. Late Serravallian — Tortonian? At the regional scale, this tectonic stage is related to the northwestward propagation of Apenninic thrust system e. Although only minor evidences are preserved in the mapped area, the uppermost temporal constrain to this tectonic stage is represented by the unconformity at the base of the late Messinian Valle Versa Chaotic Complex immediately to the south Figure 5 b ; e.
This reorientation suggests a refolding of earliest main tectonic features, during which the NW-striking fault of the Curone Valley acted as transfer fault, accommodating part of this deformation Figure 5 a.
To the West of the Curone Valley, the displacement of fold axial plane along NE-striking faults also suggests the reactivation of those faults, which controlled the deposition of the Ranzano Formation during the late Priabonian — Rupelian stage. Mass-transport deposits in confined wedge-top basins: Surficial processes shaping the messinian orogenic wedge of Northern Apennine of Italy. Italian Journal of Geosciences , , — Tectonic, sedimentary, and diapiric formation of the Messinian melange: Tertiary Piedmont Basin northwestern Italy.
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Dilek Eds. Geological Society of America Special Paper. Figure 5. Main mass-transport deposits and main unconformities surfaces are evidenced black asterisk and dotted blue line, respectively.
The geological map and map inclusions were digitized and edited with Adobe Illustrator CC.