Journal: Tectonics

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Wiley

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1944-9194

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2013 - 2019112020 - 20247
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Publications 1 - 10 of 18
  • The Awakening of the Dormant Mount Vettore Fault (2016 Central Italy Earthquake, Mw 6.6): Paleoseismic Clues on Its Millennial Silences
    Item type: Journal Article
    Galli, Paolo; Galderisi, A.; Peronace, Edoardo; et al. (2019)
    Tectonics
  • Structural Evolution, Exhumation Rates, and Rheology of the European Crust During Alpine Collision: Constraints From the Rotondo Granite—Gotthard Nappe
    Item type: Journal Article
    Ceccato, Alberto; Behr, Whitney M.; Zappone, Alba Simona; et al. (2024)
    Tectonics
    The rheology of crystalline units controls the large-scale deformation geometry and dynamics of collisional orogens. Defining a time-constrained rheological evolution of such units may help unravel the details of collisional dynamics. Here, we integrate field analysis, pseudosection calculations and in situ garnet U–Pb and mica Rb–Sr geochronology to define the structural and rheological evolution of the Rotondo granite (Gotthard nappe, Central Alps). We identify a sequence of four (D1–D4) deformation stages. Pre-collisional D1 brittle faults developed before Alpine peak metamorphism, which occurred at 34–20 Ma (U–Pb garnet ages) at 590 ± 25°C and 0.9 ± 0.1 GPa. The reactivation of D1 structures controlled the rheological evolution, from D2 reverse mylonitic shearing at amphibolite facies (520 ± 40°C and 0.8 ± 0.1 GPa) at 18–20 Ma (white mica Rb–Sr ages), to strike-slip, brittle-ductile shearing at greenschist-facies D3 (395 ± 25°C and 0.4 ± 0.1 GPa) at 14–15 Ma (white mica and biotite Rb–Sr ages), and then to D4 strike-slip faulting at shallow conditions. Although highly misoriented for the Alpine collisional stress orientation, D1 brittle structures controlled the localization of D2 ductile mylonites accommodating fast (∼3 mm/yr) exhumation rates due to their weak shear strength (<10 MPa). This structural and rheological evolution is common across External Crystalline Massifs (e.g., Aar, Mont Blanc), suggesting that the European upper crust was extremely weak during Alpine collision, its strength controlled by weak ductile shear zones localized on pre-collisional deformation structures, that in turn controlled localized exhumation at the scale of the orogen.
  • Influence of Incoming Plate Relief on Overriding Plate Deformation and Earthquake Nucleation: Cocos Ridge Subduction (Costa Rica)
    Item type: Journal Article
    Martinez-Loriente, Sara; Sallarès, Valentí; Ranero, César R.; et al. (2019)
    Tectonics
  • Geometry of a large-scale, low-angle, midcrustal thrust (Woodroffe Thrust, central Australia)
    Item type: Journal Article
    Wex, Sebastian; Mancktelow, Neil S.; Hawemann, Friedrich; et al. (2017)
    Tectonics
  • Coupled Crust-Mantle Response to Slab Tearing, Bending, and Rollback Along the Dinaride-Hellenide Orogen
    Item type: Journal Article
    Handy, Mark R.; Giese, Jörg; Schmid, Stefan; et al. (2019)
    Tectonics
  • Building the Albanides by Deep Underplating
    Item type: Journal Article
    Rossetti, Federico; Fellin, Maria Giuditta; Ballato, Paolo; et al. (2024)
    Tectonics
    Subduction orogens grow by accretion of slices of continental lithosphere scraped off the downgoing slab. Although seismological and geophysical data now illuminate the deep structure of these orogens, understanding deep crustal underplating dynamics remains challenging. This study focuses on the Albanides, a subduction orogen in the central-eastern Mediterranean, formed by the accretion of continental material during the eastward subduction of Adria beneath Eurasia. The thickening at depth of the crustal edifice occurred along with the development of a shallow fold-and-thrust belt. This process involved the deposition of progressively younger syn-orogenic deposits as deformation migrated SW-ward from the Cretaceous to the Miocene. To explore the relationship between deep-seated structures and surface deformation, we investigate the recent crustal thickening of the Albanides using low-temperature thermochronology and 3D thermokinematic modeling of a seismically constrained crustal section. Our data reveal a pulse of exhumation during the latest Miocene-Pliocene, amounting to approximately 3–4 km, which we propose has been driven by a deep-seated thrust system imaged by receiver function images. These inferences have significant implications for understanding the interactions between deep and shallow crustal processes and their role in shaping the Albanides. Furthermore, they provide insights into the timing and kinematics of subduction-related orogenic processes and, potentially, on the separation of the Adria plate from Africa.
  • Exhumation and Surface Evolution of the Western High Atlas and Surrounding Regions as Constrained by Low‐Temperature Thermochronology
    Item type: Journal Article
    Lanari, Riccardo; Fellin, Maria Giuditta; Faccenna, Claudio; et al. (2020)
    Tectonics
  • Preservation of contrasting geothermal gradients across the Caribbean-North America plate boundary (Motagua Fault, Guatemala)
    Item type: Journal Article
    Simon-Labric, Thibaud; Brocard, Gilles Y.; Teyssier, Christian; et al. (2013)
    Tectonics
  • Rollback Orogeny Model for the Evolution of the Swiss Alps
    Item type: Journal Article
    Kissling, Eduard; Schlunegger, Fritz (2018)
    Tectonics
    The construction of the European Alps and the Himalayas has been related to the convergence and subsequent collision of two continental plates. Nearly all models of orogeny build on this concept, and all of them relate the stacking of nappes and the buildup of topography to compressional forces at work in response to the collision between two continental plates. For the central European Alps, however, these models fail to explain the first‐order observations of a mountain belt, which particularly includes the striking isostatic imbalance between the low surface topography and the thick crust beneath the Alps. Here we review and synthesize data on the geologic architecture of the central Alps, the chronology and pattern of crustal deformation, and information about the deep crustal structure derived from seismic tomography. Furthermore, we discuss the intrinsic and explicit assumptions in the kinematic models of Alpine evolution in the context of plate tectonic considerations. We combine these views with progress in understanding that has been gained through subduction and collision, isostatic mass and force balancing and with information that has been collected on the modern seismic regime. We conclude that a rollback orogeny model for the European plate offers the most suitable concept to explain the ensemble of surface and deep lithosphere observations. In this model gravity forces drive the evolution of the orogen and the construction of surface topography is accomplished without the requirement of a hard collision between two continents.
Publications 1 - 10 of 18