Thermochronological record of thrusting and strike-slip faulting along the Giudicarie fault system (Alps, Northern Italy)

Pomella, Hannah; Fügenschuh, Bernhard

doi:10.1016/j.tecto.2012.04.015

Cited by 41 publications

(68 citation statements)

References 40 publications

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“…Based on syntectonic sedimentation (Castellarin et al, ) and thermochronologic data (Heberer et al, ; Zattin et al, ), the preferred estimate for the onset of thrusting in the Southern Alps is about 14 Ma, thus yielding a long‐term shortening rate of about 3 mm/year, 2 times higher than the postglacial shortening rate. If assuming on the other hand that thrusting initiated as early as 21 Ma at the onset of Adria indentation (Pomella et al, ), then the long‐term mean shortening rate would be of 2 mm/year, which is still higher than the postglacial rate. Extrapolating this value back in time and assuming in‐sequence propagation of thrusting (Castellarin & Cantelli, ; Mellere et al, ; Zattin et al, ) indicates that slip on the Monte Simeone thrust would have stopped at 11 Ma along with activation of the Staro‐Selo thrust (age of slip inception on the Staro‐Selo thrust would become 16.5 Ma if considering the upper bound of 21 Ma for the onset of thrusting in the Southern Alps).…”

Section: Discussionmentioning

confidence: 99%

Fragmentation of the Adriatic Promontory: New Chronological Constraints From Neogene Shortening Rates Across the Southern Alps (NE Italy)

Moulin

Benedetti

2018

Tectonics

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The eastern Southern Alps are located at the northern tip of the Adria microplate, which imposes 2.0–2.5 mm/year of N‐S‐convergence relative to stable Eurasia. We map surface evidence of recent folding/faulting in this area from a 5‐m Digital Elevation Model (DEM). In the eastern part of the belt, observations reveal a 30‐km‐wide zone of active folding composed of at least five growing anticlines. The most recent ones warped the postglacial alluvial surface by <10 m. Combining these findings with published geological and geophysical data allows us to infer that active thrusting occurs along a single deeply rooted thrust, which accommodates the indentation of the Adriatic crust. Resolving the observed pattern of uplift on the inferred fault geometry indicates that NNE‐SSW shortening across the eastern Southern Alps has occurred at a rate of about 1.5 mm/year over the postglacial period. On the other hand, a balanced cross section for the eastern Southern Alps at the scale of the upper crust constrains a minimum of 43 km of finite shortening over the last 14 Ma, yielding a shortening rate of about 3 mm/year, which is 2 times higher than the postglacial shortening rate. This decrease in the shortening rate is associated to the Pleistocene activation of new thrusts that is compatible with a change in the direction of compression. The inferred local change in the kinematics of thrusting during the Pleistocene is consistent with a change from Nubia‐imposed to Adria‐imposed convergence indicating that the fragmentation of the Adriatic promontory could have occurred 1–2 Ma ago.

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Section: Discussionmentioning

confidence: 99%

Fragmentation of the Adriatic Promontory: New Chronological Constraints From Neogene Shortening Rates Across the Southern Alps (NE Italy)

Moulin

Benedetti

2018

Tectonics

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“…Rosenberg and Garcia () link the BF the northern GF. This is supported by a westward continuation of young ZFT and AFT cooling ages (Middle and Upper Miocene, respectively) between the SW corner of the TW, the indenter and the northern GF (e.g., Pomella et al, ). Close to the northern DI boundary, brittle faults extend from the GF into the Austroalpine units (e.g., Luth et al, ; Viola et al, ).…”

Section: Tectonic Settingmentioning

confidence: 90%

“…Dating of fault gouges and pseudotachylites proves brittle movements at the GF and the structures linking the GF to the PGF in Oligocene/Miocene times. The faults moved with sinistral and northwest side up sense, as apatite fission track (AFT) ages indicate (Martin et al, 1998;Müller et al, 2001;Pleuger et al, 2012;Pomella et al, 2011Pomella et al, , 2012. For the PGF, evidence for Miocene brittle, north side up, and dextral fault activity comes from tectonic analysis, ZFT and AFT cooling ages, and dating of fault gouges and pseudotachylites (Bartel et al, 2014;Läufer et al, 1997;Müller et al, 2001;Pomella et al, 2018;Rathore & Becke, 1980;Schmid et al, 1989;Sprenger & Heinisch, 1992;Zwingmann & Mancktelow, 2004).…”

Section: The DI and Its Boundariesmentioning

confidence: 99%

Active Seismotectonic Deformation in Front of the Dolomites Indenter, Eastern Alps

et al. 2018

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We use earthquake focal mechanisms to study present‐day deformation and stress in the western part of the Eastern European Alps. We define the following regions, based on seismicity and kinematically compatible focal mechanism types: (1) the northern and western parts of the Dolomites indenter, the western and central Tauern Window, and the northern Alpine margin and foreland lack significant seismicity. (2) The indenter boundaries are characterized by strike‐slip faulting. Based on earthquake and geodetic data, the western and northern indenter boundaries are active sinistral and dextral strike‐slip/oblique slip faults. (3) West and north of the indenter corner, we observe normal and strike‐slip faulting in an up to 70 km‐wide zone. From west to east, the minimum horizontal stress rotates clockwise about 10–20°, from NE to ENE. (4) North of (3), east of the Swiss/Austrian border, we find evidence for N to NNW directed thrust faulting, and local orogen‐parallel extension. From our results and geodetic data, we infer that relative to a fixed northern foreland, NNW directed indentation is transferred at depth via the Sub‐Tauern thrust system to this 100‐km‐wide zone of localized thrusting. A lack of evidence for major, active strike‐slip faulting north of the Tauern Window is in line with geodetic data, which show no significant velocity difference between the northern part of the Eastern Alps and their foreland.

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“…10. Zircon and apatite fission-track ages along the GF constrain its motion to have begun in late Oligocene-Early Miocene time (Pomella et al 2012). Biostratigraphic criteria along the Giudicarie Thrust Belt (Luciani and Silvestrini 1996) indicate that the main phase of sinistral transpression lasted from about 23-21 Ma Scharf et al 2013) to 7 Ma based on the lateral continuation of this thrust belt to the southwest into the subsurface Milan Thrust (MT in Fig.…”

Section: Separation Of the Western And Eastern Adriatic Indentersmentioning

confidence: 99%

“…In the Central Alps, north-south shortening related to wedging of the Adriatic lower crust post-dated 31 Ma (Rosenberg and Kissling 2013) and occurred mostly from 21 to 16 Ma (Schönborn 1992;Schiunnach et al 2010). Thus, indentation of the western block overlapped in time with indentation of the eastern block bounded by the GF (Pomella et al 2012).…”

Section: Separation Of the Western And Eastern Adriatic Indentersmentioning

confidence: 99%

Reconstructing the Alps–Carpathians–Dinarides as a key to understanding switches in subduction polarity, slab gaps and surface motion

Handy

Ustaszewski

Kissling

2014

Int J Earth Sci (Geol Rundsch)

286

356

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Thermochronological record of thrusting and strike-slip faulting along the Giudicarie fault system (Alps, Northern Italy)

Cited by 41 publications

References 40 publications

Fragmentation of the Adriatic Promontory: New Chronological Constraints From Neogene Shortening Rates Across the Southern Alps (NE Italy)

Fragmentation of the Adriatic Promontory: New Chronological Constraints From Neogene Shortening Rates Across the Southern Alps (NE Italy)

Active Seismotectonic Deformation in Front of the Dolomites Indenter, Eastern Alps

Reconstructing the Alps–Carpathians–Dinarides as a key to understanding switches in subduction polarity, slab gaps and surface motion

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