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  • 1
    Monograph available for loan
    Monograph available for loan
    Advances in interpretation of geological processes : Refinement of multi-scale data and integration in numerical modelling (2010)
    London : The Geological Society
    Associated volumes
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    Call number: 9/M 07.0421(332)
    In: Geological Society special publication
    Description / Table of Contents: Iterative comparison of analytical results and natural observations with predictions of numerical models improves interpretation of geological processes. Further refinements derive from wide-angle comparison of results from various scales of study. In this volume, advances from field, laboratory and modelling approaches to tectonic evolution from the lithosphere to the rock scale - are compared. Constructive use is made of apparently discrepant or non-consistent results from analytical or methodological approaches in processing field or laboratory data, P-T estimates, absolute or relative age determinations of tectonic events, tectonic unit size in crustal scale deformation, grain-scale deformation processes, various modelling approaches, and numerical techniques. Advances in geodynamic modelling critically depend on new insights into grain- and subgrain-scale deformation processes. Conversely, quantitative models help to identify which rheological laws and parameters exert the strongest control on multi-scale deformation up to lithosphere and upper mantle scale.
    Type of Medium: Monograph available for loan
    Pages: vii, 230 S.
    ISBN: 9781862392953
    Series Statement: Geological Society special publication 332
    URL: http://sp.lyellcollection.org/content/vol332/issue1/
    Classification:
    Lithosphere
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
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    Advances in Interpretation of Geological Processes : Refinement of Multi-scale Data and Integration in Numerical Modelling (2010)
    London : The Geological Society
    Details
    Keywords: geological processes; tectonics; numerical models
    Description / Table of Contents: Disequilibrium textures versus equilibrium modelling: geochronology at the crossroads / Igor M. Villa / Geological Society, London, Special Publications, 332, 1-15, 1 January 2010, https://doi.org/10.1144/SP332.1 --- Argon enters the retentive zone: reassessment of diffusion parameters for K-feldspar in the South Cyclades Shear Zone, Ios, Greece / M. A. Forster and G. S. Lister / Geological Society, London, Special Publications, 332, 17-34, 1 January 2010, https://doi.org/10.1144/SP332.2 --- Serrated quartz grain boundaries, temperature and strain rate: testing fractal techniques in a syntectonic granite / Manish A. Mamtani and R. O. Greiling / Geological Society, London, Special Publications, 332, 35-48, 1 January 2010, https://doi.org/10.1144/SP332.3 --- Microstructure and elastic anisotropy of naturally deformed leucogneiss from a shear zone in Montalto (southern Calabria, Italy) / Rosolino Cirrincione, Eugenio Fazio, Renée Heilbronner, Hartmut Kern, Kurt Mengel, Gaetano Ortolano, Antonino Pezzino and Rosalda Punturo / Geological Society, London, Special Publications, 332, 49-68, 1 January 2010, https://doi.org/10.1144/SP332.4 --- Geometry of intercrystalline brine in plastically deforming halite rocks: inference from electrical resistivity / Tohru Watanabe / Geological Society, London, Special Publications, 332, 69-78, 1 January 2010, https://doi.org/10.1144/SP332.5 --- Brittle plus plastic deformation of gypsum aggregates experimentally deformed in torsion to high strains: quantitative microstructural and texture analysis from optical and diffraction data / M. Zucali, V. Barberini, D. Chateigner, B. Ouladdiaf and L. Lutterotti / Geological Society, London, Special Publications, 332, 79-98, 1 January 2010, https://doi.org/10.1144/SP332.6 --- Numerical modelling of spontaneous slab breakoff dynamics during continental collision / Cyrill Baumann, Taras V. Gerya and James A. D. Connolly / Geological Society, London, Special Publications, 332, 99-114, 1 January 2010, https://doi.org/10.1144/SP332.7 --- Present-day vertical isostatic readjustment of the Western Alps revealed by numerical modelling and geodetic and seismotectonic data / Annalisa Gardi, Stéphane Baize and Oona Scotti / Geological Society, London, Special Publications, 332, 115-128, 1 January 2010, https://doi.org/10.1144/SP332.8 --- Block model versus thermomechanical model: new insights on the present-day regional deformation in the surroundings of the Calabrian Arc / Raffaele Splendore, Anna Maria Marotta, Riccardo Barzaghi, Alessandra Borghi and Letizia Cannizzaro / Geological Society, London, Special Publications, 332, 129-147, 1 January 2010, https://doi.org/10.1144/SP332.9 --- The role of mantle hydration in continental crust recycling in the wedge region / Marco Meda, Anna Maria Marotta and Maria Iole Spalla / Geological Society, London, Special Publications, 332, 149-172, 1 January 2010, https://doi.org/10.1144/SP332.10 --- Three-dimensional evaluation of fabric evolution and metamorphic reaction progress in polycyclic and polymetamorphic terrains: a case from the Central Italian Alps / Francesca Salvi, Maria Iole Spalla, Michele Zucali and Guido Gosso / Geological Society, London, Special Publications, 332, 173-187, 1 January 2010, https://doi.org/10.1144/SP332.11 --- The interaction of deformation and metamorphic reactions / Bruce E. Hobbs, Alison Ord, Maria Iole Spalla, Guido Gosso and Michele Zucali / Geological Society, London, Special Publications, 332, 189-223, 1 January 2010, https://doi.org/10.1144/SP332.12
    Pages: Online-Ressource (VII, 230 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781862395800
    URL: https://sp.lyellcollection.org/content/332/1
    Language: English
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  • 3
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    The role of mantle hydration in continental crust recycling in the wedge region (2010)
    In:  Geological Society Special Publication 332: 149-172.
    Details
    Publication Date: 2010-04-16
    Description: In orogenic belts high pressure-low temperature (HP-LT) metamorphism can widely affect units derived from both the oceanic and the continental lithosphere. In order to verify whether high P/T (pressure/temperature) ratios recorded in the continental lithosphere can result from tectonic erosion, ablative subduction and recycling in the mantle wedge, we implemented a 2D numerical model to simulate oceanic subduction beneath a continent. Particular attention is paid to the role played by mantle hydration within the continental crust recycled in the wedge region. A comparison between hydrated and non-hydrated models highlights that hydration is fundamental in allowing the recycling of crustal material at shallow depths ([≤]150 km for a convergence rate of 1 cm year-1), making the uprising and exhumation of buried crustal material during active subduction possible. The recycled crustal material can originate from any crustal level. The Tmax and Pmax distributions within the final marker configuration show that crustal recycling induces the coupling of volumes that reached different depths during their paths in the corner flow. To verify the reliability of this model we compare predictions with natural geological data from the Austroalpine Sesia-Lanzo Zone (SLZ), the largest eclogite-facies crustal fragment of early Alpine age and whose Alpine tectonic evolution has been interpreted as compatible with a cycle of burial at depth and exhumation during active subduction of the oceanic lithosphere. The relationships between natural P-T estimates and predicted P-T values show that the simulated geodynamic scenario generates a thermal regime coherent with that affecting the subducted continental crust of the SLZ, which may have been stable for a long time during Alpine subduction, allowing the SLZ rocks to accomplish their burial and exhumation path under an active subduction regime.
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  • 4
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    Block model versus thermomechanical model: new insights on the present-day regional deformation in the surroundings of the Calabrian Arc (2010)
    In:  Geological Society Special Publication 332: 129-147.
    Details
    Publication Date: 2010-04-16
    Description: A finite-element thermomechanical model is used to analyse present-day crustal deformation in the surroundings of the Calabrian Arc. The major structural complexities of the Tyrrhenian area are taken into account, along with the rheological properties of the rocks resulting from a thermal analysis. A comparison between the results obtained from a model composed of three wide rheologically uniform blocks and those obtained from the thermomechanical model allows us to better constrain the geophysical assumptions and shed light on the roles of the different active mechanisms acting in the Tyrrhenian. Our comparative analysis enlightens the crucial role played by lateral rheological heterogeneities when deformation is analysed at short wavelengths of a few hundred kilometres of the Tyrrhenian, driving the observed diffuse SW-NE extension within the regional context of active Africa-Eurasia convergence. Furthermore, a {chi}2 analysis based on comparisons with GPS data confirms the hypothesis that a significant part of the Africa-Eurasia convergence is absorbed through the Calabrian subduction.
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  • 5
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    Upper and lower crustal evolution during lithospheric extension: numerical modelling and natural footprints from the European Alps (2009)
    In:  Geological Society Special Publication 321: 33-72.
    Details
    Publication Date: 2009-10-15
    Description: When continental rifting does not develop on a stable continental lithosphere, geodynamic interpretation of igneous and metamorphic records, as well as structural and sedimentary imprints of rifting-related lithospheric extension, can be highly ambiguous since different mechanisms can be responsible for regional HT-LP metamorphism. This is the case of the European Alps, where the exposure of Variscan structural and metamorphic imprints within the present-day Alpine structural domains indicates that before the Pangaea break-up, the continental lithosphere was thermally and mechanically perturbed by Variscan subduction and collision. To reduce this ambiguity, we use finite-element techniques to implement numerical geodynamic models for analysing the effects of active extension during the Permian-Triassic period (from 300 to 220 Ma), overprinting a previous history of Variscan subduction-collision up to 300 Ma. The lithosphere is compositionally stratified in crust and mantle and its rheological behaviour is that of an incompressible viscous fluid controlled by a power law. Model predictions of lithospheric thermal state and strain localization are compared with metamorphic data, time interval of plutonic and volcanic activity and coeval onset of sedimentary environments. Our analysis confirms that the integrated use of geological data and numerical modelling is a valuable key for inferring the pre-orogenic rifting evolution of a fossil passive margin. In the specific case of the European Alps, we show that a relative high rate of active extension is required, associated for example with a far extensional field, to achieve the fit with the maximal number of tectonic units. Furthermore, in this case only, thermal conditions allowing partial melting of the crust accompanying gabbroic intrusions and HT-LP metamorphism are generated. The concordant set of geological events that took place from Permian to Triassic times in the natural Alpine case is justified by the model and is coherent with the progression of lithospheric thinning, later evolving into the appearance of oceanic crust.
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  • 6
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    2-D numerical study of hydrated wedge dynamics from subduction to post-collisional phases (2017)
    Oxford University Press
    Details
    Publication Date: 2017-08-03
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Royal Astronomical Society.
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  • 7
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    Analysis of natural tectonic systems coupled with numerical modelling of the polycyclic continental lithosphere of the Alps (2010)
    Taylor & Francis
    Details
    Publication Date: 2010-06-07
    Print ISSN: 0020-6814
    Electronic ISSN: 1938-2839
    Topics: Geosciences
    Published by Taylor & Francis
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  • 8
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    On Earthquake Detectability by the Next-Generation Gravity Mission (2020)
    Springer
    Details
    Publication Date: 2020-07-29
    Print ISSN: 0169-3298
    Electronic ISSN: 1573-0956
    Topics: Geosciences , Physics
    Published by Springer
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  • 9
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    Permian-Triassic high thermal regime in the Alps: Result of late Variscan collapse or continental rifting? Validation by numerical modeling (2007)
    American Geophysical Union
    Details
    Publication Date: 2007-08-01
    Print ISSN: 0278-7407
    Electronic ISSN: 1944-9194
    Topics: Geosciences
    Published by American Geophysical Union
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  • 10
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    New Insights into Long-Term Aseismic Deformation and Regional Strain Rates from GNSS Data Inversion: The Case of the Pollino and Castrovillari Faults (2020)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2020-09-09
    Description: We present a novel inverse method for discriminating regional deformation and long-term fault creep by inversion of GNSS velocities observed at the spatial scale of intraplate faults by exploiting the different spatial signatures of these two mechanisms. In doing so our method provides a refined estimate of the upper bound of the strain accumulation process. As case study, we apply this method to a six year GNSS campaign (2003–2008) set up in the southern portion of the Pollino Range over the Castrovillari and Pollino faults. We show that regional deformation alone cannot explain the observed deformation pattern and implies high geodetic strain rate, with a WSW-ENE extension of 86±41×10−9/yr. Allowing for the possibility of fault creep, the modelling of GNSS velocities is consistent with their uncertainties and they are mainly explained by a shallow creep over the Pollino fault, with a normal/strike-slip mechanism up to 5 mm/yr. The regional strain rate decrease by about 70 percent and is characterized by WNW-ESE extension of 24±28×10−9/yr. The large uncertainties affecting our estimate of regional strain rate do not allow infering whether the tectonic regime of the area is extensional or strike-slip, although the latter is slightly more likely.
    Electronic ISSN: 2072-4292
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Molecular Diversity Preservation International
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