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  • 1
    Call number: 9/M 07.0421(311)
    In: Geological Society special publication
    Type of Medium: Monograph available for loan
    Pages: 368 S.
    ISBN: 9781862392700
    Series Statement: Geological Society special publication 311
    Classification:
    Tectonics
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Description / Table of Contents: Geodynamics of collision and collapse at the Africa–Arabia–Eurasia subduction zone – an introduction / Douwe J. J. van Hinsbergen, Michael A. Edwards and Rob Govers / Geological Society, London, Special Publications, 311, 1-7, 29 April 2009, https://doi.org/10.1144/SP311.1 --- Melange genesis and ophiolite emplacement related to subduction of the northern margin of the Tauride–Anatolide continent, central and western Turkey / Alastair H. F. Robertson, Osman Parlak and Tı̇mur Ustaömer / Geological Society, London, Special Publications, 311, 9-66, 29 April 2009, https://doi.org/10.1144/SP311.2 --- Tectono-stratigraphy of the Çankırı Basin: Late Cretaceous to early Miocene evolution of the Neotethyan Suture Zone in Turkey / Nuretdin Kaymakci, Yakup Özçelik, Stanley H. White and Paul M. Van Dijk / Geological Society, London, Special Publications, 311, 67-106, 29 April 2009, https://doi.org/10.1144/SP311.3 --- Oligocene–Miocene basin evolution in SE Anatolia, Turkey: constraints on the closure of the eastern Tethys gateway / Silja K. Hüsing, Willem-Jan Zachariasse, Douwe J. J. van Hinsbergen, Wout Krijgsman, Murat Inceöz, Mathias Harzhauser, Oleg Mandic and Andreas Kroh / Geological Society, London, Special Publications, 311, 107-132, 29 April 2009, https://doi.org/10.1144/SP311.4 --- Long-term evolution of the North Anatolian Fault: new constraints from its eastern termination / Aurélia Hubert-Ferrari, Geoffrey King, Jérome van der Woerd, Igor Villa, Erhan Altunel and Rolando Armijo / Geological Society, London, Special Publications, 311, 133-154, 29 April 2009, https://doi.org/10.1144/SP311.5 --- Mediterranean snapshots of accelerated slab retreat: subduction instability in stalled continental collision / M. A. Edwards and B. Grasemann / Geological Society, London, Special Publications, 311, 155-192, 29 April 2009, https://doi.org/10.1144/SP311.6 --- Evolution of the southern Tyrrhenian slab tear and active tectonics along the western edge of the Tyrrhenian subducted slab / Andrea Argnani / Geological Society, London, Special Publications, 311, 193-212, 29 April 2009, https://doi.org/10.1144/SP311.7 --- Geochemical and temporal evolution of Cenozoic magmatism in western Turkey: mantle response to collision, slab break-off, and lithospheric tearing in an orogenic belt / Yildirim Dilek and Şafak Altunkaynak / Geological Society, London, Special Publications, 311, 213-233, 29 April 2009, https://doi.org/10.1144/SP311.8 --- Insights from the Apennines metamorphic complexes and their bearing on the kinematics evolution of the orogen / Gianluca Vignaroli, Claudio Faccenna, Federico Rossetti and Laurent Jolivet / Geological Society, London, Special Publications, 311, 235-256, 29 April 2009, https://doi.org/10.1144/SP311.9 --- Sequential development of interfering metamorphic core complexes: numerical experiments and comparison with the Cyclades, Greece / C. Tirel, P. Gautier, D. J. J. van Hinsbergen and M. J. R. Wortel / Geological Society, London, Special Publications, 311, 257-292, 29 April 2009, https://doi.org/10.1144/SP311.10 --- The Itea–Amfissa detachment: a pre-Corinth rift Miocene extensional structure in central Greece / Dimitrios Papanikolaou, Leonidas Gouliotis and Maria Triantaphyllou / Geological Society, London, Special Publications, 311, 293-310, 29 April 2009, https://doi.org/10.1144/SP311.11 --- Neogene brittle detachment faulting on Kos (E Greece): implications for a southern break-away fault of the Menderes metamorphic core complex (western Turkey) / Douwe J. J. van Hinsbergen and Flora Boekhout / Geological Society, London, Special Publications, 311, 311-320, 29 April 2009, https://doi.org/10.1144/SP311.12 --- Magnetostratigraphy of early–middle Miocene deposits from east–west trending Alaşehir and Büyük Menderes grabens in western Turkey, and its tectonic implications / Sevket Sen and Gürol Seyitoğlu / Geological Society, London, Special Publications, 311, 321-342, 29 April 2009, https://doi.org/10.1144/SP311.13 --- The structure of the Kythira–Antikythira strait, offshore SW Greece (35.7°–36.6°N) / Eleni Kokinou and Evangelos Kamberis / Geological Society, London, Special Publications, 311, 343-360, 29 April 2009, https://doi.org/10.1144/SP311.14 --- Erratum --- Melange genesis and ophiolite emplacement related to subduction of the northern margin of the Tauride–Anatolide continent, central and western Turkey / Alastair H. F. Robertson, Osman Parlak and Tı̇mur Ustaömer / Geological Society, London, Special Publications, 311, 1, 29 July 2009, https://doi.org/10.1144/SP311.Erratum
    Pages: Online-Ressource (368 Seiten)
    ISBN: 9781862392700
    Language: English
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  • 3
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    In:  J. Geophys. Res., Hannover, Geophys. Institut der Universität Karlsruhe, vol. 111, no. B5, pp. 199-208, pp. B05403, (ISSN: 1340-4202)
    Publication Date: 2006
    Keywords: Strain ; Fault zone ; SAF ; USA ; Modelling ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Geodesy ; JGR ; geodesy ; strain ; accumulation ; Carrizo ; segment ; 0560 ; Computational ; Geophysics: ; Numerical ; solutions ; (4255) ; 1236 ; Geodesy ; and ; Gravity: ; Rheology ; of ; the ; lithosphere ; and ; mantle ; (7218, ; 8160) ; 1242 ; Seismic ; cycle ; related ; deformations ; (6924, ; 7209, ; 7223, ; 7230) ; 1240 ; Satellite ; geodesy: ; results ; (6929, ; 7215, ; 7230, ; 7240) ; 8111 ; Tectonophysics: ; Continental ; tectonics: ; strike-slip ; and ; transform
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  • 4
    Publication Date: 2013-06-11
    Description: [1]  We investigate whether predictions of mantle structure from tectonic reconstructions are in agreement with a detailed tomographic image of seismic P-wave velocity structure under the Caribbean region. In the upper mantle, positive seismic anomalies are imaged under the Lesser Antilles and Puerto Rico. These anomalies are interpreted as remnants of Atlantic lithosphere subduction and confirm tectonic reconstructions that suggest at least 1100 km of convergence at the Lesser Antilles island arc during the past ~45 Myr. The imaged Lesser-Antilles slab consists of a northern and southern anomaly, separated by a low velocity anomaly across most of the upper mantle, which we interpret as the subducted North America-South America plate boundary. The southern edge of the imaged Lesser Antilles slab agrees with vertical tearing of South America lithosphere. The northern Lesser Antilles slab is continuous with the Puerto Rico slab along the northeastern plate boundary. This results in an amphitheatre-shaped slab and it is interpreted as westward subducting North America lithosphere that remained attached to the surface along the northeastern boundary of the Caribbean plate. At the Muertos Trough, however, material is imaged until a depth of only 100 km, suggesting a small amount of subduction. The location and length of the imaged South Caribbean slab agrees with proposed subduction of Caribbean lithosphere under the northern South America plate. An anomaly related to proposed Oligocene subduction at the Nicaragua rise is absent in the tomographic model. Beneath Panama, a subduction window exists across the upper mantle, which is related to the cessation of subduction of the Nazca plate under Panama since 9.5 Ma and possibly the preceding subduction of the extinct Cocos-Nazca spreading center. In the lower mantle two large anomaly patterns are imaged. The westernmost anomaly agrees with the subduction of Farallon lithosphere. The second lower mantle anomaly is found east of the Farallon anomaly and is interpreted as a remnant of the late Mesozoic subduction of North and South America oceanic lithosphere at the Greater Antilles, Aves ridge and Leeward Antilles. The imaged mantle structure does not allow us to discriminate between an ‘Intra-Americas’ origin and a ‘Pacific origin’ of the Caribbean plate.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 5
    Publication Date: 2015-06-14
    Description: More than seven years of observations of postseismic relaxation after the 2004 Sumatra-Andaman earthquake provide an improving view on the deformation in the wide vicinity of the 2004 rupture. We include both GRACE gravity field data that show a large postseismic signal over the rupture area and GPS observations in the back-arc region. With increasing time GPS and GRACE show contrasting relaxation styles that were not easily discernible on shorter time series. We investigate whether mantle creep can simultaneously explain the far-field surface displacements and the long wavelength gravity changes. We interpret contrasts in the temporal behaviour of the GPS-GRACE observations in terms of lateral variations in rheological properties of the asthenosphere below and above the slab. Based on 1-D viscoelastic models, our results support an (almost) order of magnitude contrast between oceanic lithosphere viscosity and continental viscosity, which likely means that the low viscosities frequently found from postseismic deformation after subduction earthquakes are valid only for the mantle wedge. Next to mantle creep, we also consider afterslip as an alternative mechanism for postseismic deformation. We investigate how the combination of GRACE and GPS data can better discriminate between different mechanisms of postseismic relaxation: distributed deformation (mantle creep) versus localized deformation (afterslip). We conclude that the GRACE observed gravity changes rule out afterslip as the dominant mechanism explaining long wavelength deformation even over the first year after the event.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 6
    Publication Date: 2012-04-15
    Description: SUMMARY Mechanical equilibrium of tectonic plates implies that lithospheric edge and body forces are balanced by forces arising from interaction with the underlying mantle. We use this quantitative physical relation to integrate existing modelling approaches of lithosphere dynamics and mantle flow into a new combined approach applied to the Eurasian Plate. By combining a thorough analysis of lithospheric forces with the requirement of torque balance we constrain the orientation of the torque on Eurasia arising from mantle tractions. We use this constraint to evaluate convective mantle flow models driven by tomographic or subduction history model anomalies and observed plate motion. Mantle forcing is considered through both shear at the bottom of the plate and induced dynamic topography. We find that instantaneous semi-analytic flow models without lateral viscosity variations generate tractions that meet the constraint from Eurasian lithosphere dynamics, but only for specific ranges of mantle flow parameters. Of the explored set of mantle anomaly models, only mantle flow models based on S -wave tomography anomalies can balance Eurasia for realistic viscosity profiles and velocity–density scaling. Choices in mantle density forcing and viscosity are crucial in that they govern the relative magnitude of tractions due to convective mantle flow (‘active tractions’) and resistive tractions due to plate motion (‘passive tractions’). We find mechanical balance is only achieved for similar torque magnitudes of active and passive shear. The two shear contributions do however in no case balance each other and a considerable, dominant, net torque from edge forces is required to balance total mantle tractions and lithospheric body forces (LBFs). Our analysis provides a range of mechanically consistent total force sets acting on the Eurasian Plate. Using this result we find that mantle buoyancy forces and LBFs acting on Eurasia itself are important driving forces but do not drive Eurasia in the observed direction. Continental collision at Eurasia’s southern boundary significantly deviates Eurasia northwards. Our combined torque balance approach, in which mantle tractions from convective mantle flow modelling are combined with explicitly applied edge forces, thus emphasizes the role of plate interactions to the dynamics of tectonic plates.
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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  • 7
    Publication Date: 2011-10-26
    Description: SUMMARY We study possible responses to arc–continent or continent–continent collision using numerical models. Our short-term integration models show that the initial stage of deformation following continental collision is governed by the competition between three potential weakness zones: (1) mantle wedge, (2) plate interface and (3) lower continental crust. Depending on which of these is the weakest zone in the system, three different responses can be recognized: (1) subduction polarity reversal, (2) continuation of subduction and (3) delamination and back stepping. Subduction polarity reversal occurs if the mantle wedge is the weakest zone in the system. This happens only if the viscosity of the mantle wedge is at least one order of magnitude lower than the average viscosity of the lithosphere. In continent–continent collision, one additional condition needs to be satisfied for subduction polarity reversal to occur: for the subducting lithosphere the ratio of the viscosity of the lower continental crust to the viscosity of the upper lithospheric mantle must be equal to or higher than 0.006. The time required for polarity reversal depends on several parameters: the convergence rate, the sinking velocity of the detached slab and the relative strength of the mantle wedge, arc and backarc. The response to collision is continued subduction if the plate interface is the weakest zone, and is delamination and back stepping if the lower continental crust is the weakest area in the system. Our finding that a low-viscosity wedge is a prerequisite for a reversal of subduction polarity agrees with inferences about regions for which subduction polarity reversal has been proposed.
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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  • 8
    Publication Date: 2011-01-26
    Description: SUMMARY A preexisting weakness zone in the lithosphere is required to initiate subduction. Here, we focus on a new type of weakness zone, a Subduction-Transform Edge Propagator (STEP) fault, which is inherited from a tear along the edge of a slab. Using coupled thermal–mechanical models, we show that STEP fault-perpendicular convergence results in a dipping shear zone in any tectonic setting. At a continental margin, this shear zone dips towards the continent, which is an excellent starting condition for ocean–continent subduction. If (far field) convergence persists, STEP faults become new subduction boundaries. The trench moves landward during the earliest stages of convergence. When slab pull becomes a dominant driving force, after ∼80 km convergence, trench roll-back commences. The initial geometry and mechanical properties of the sub-crustal STEP fault zone affect the results; subduction initiation is facilitated by a wide (∼100 km) and low-viscosity weakness zone. Incipient subduction is easier for young oceanic lithosphere due to its lower flexural rigidity and is insensitive to the far field convergence rate. As STEP faults are commonly associated with young oceanic lithosphere, subduction initiation is thus relatively easy along them. Of particular interest are continent–ocean margins where STEP faulting has occurred.
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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  • 9
    Publication Date: 2014-05-06
    Description: The north Caribbean plate boundary zone is a broad deformation zone with several fault systems and tectonic blocks that move with different velocities. The indentation by the Bahamas Platform (the " Bahamas Collision" ) is generally invoked as a cause of this fragmentation. We propose that a second driver of deformation is the western edge of the south-dipping Puerto Rico slab moving sideways with the North America plate. The westward motion of the slab edge results in a push on the Caribbean plate further west. We refer to this second mechanism for deformation as " Slab Edge Push" . The motion of the North America plate relative to the Caribbean plate causes both drivers to migrate from east to west. The Bahamas Collision and Slab Edge Push have been operating simultaneously since the Miocene. The question is the relative importance of the two mechanisms. We use mechanical finite element models that represent the two mechanisms from the Late Oligocene (30 Ma) to the Present. For the Present, both models successfully reproduce observed deformation, implying that both models are viable. Back in time the Slab Edge Push mechanism better reproduces observations. Neither mechanism successfully reproduces the observed Miocene counter-clockwise rotation of Puerto Rico. We use this rotation to tune a final model that includes fractional contributions of both mechanisms. We find that the Slab Edge Push was the dominant driver of deformation in the north Caribbean plate boundary zone since 30 Ma.
    Print ISSN: 0278-7407
    Electronic ISSN: 1944-9194
    Topics: Geosciences
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 10
    Publication Date: 2014-11-28
    Description: The landscape of Mars shows incised channels that often appear abruptly in the landscape, suggesting a groundwater source. However, groundwater outflow processes are unable to explain the reconstructed peak discharges of the largest outflow channels based on their morphology. Therefore, there is a disconnect between groundwater outflow processes and the resulting morphology. Using a combined approach with experiments and numerical modelling, we examine outflow processes that result from pressurized groundwater. We use a large sandbox flume, where we apply a range of groundwater pressures at the base of a layer of sediment. Our experiments show that different pressures result in distinct outflow processes and resulting morphologies. Low groundwater pressure results in seepage, forming a shallow surface lake and a channel when the lake overflows. At intermediate groundwater pressures, fissures form and groundwater flows out more rapidly. At even higher pressures, the groundwater initially collects in a subsurface reservoir that grows due to flexural deformation of the surface. When this reservoir collapses, a large volume of water is released to the surface. We numerically model the ability of these processes to produce floods on Mars and compare the results to discharge estimates based on previous morphological studies. We show that groundwater seepage and fissure outflow are insufficient to explain the formation of large outflow channels from a single event. Instead, formation of a flexure-induced subsurface reservoir and subsequent collapse generates large floods that can explain the observed morphologies of the largest outflow channels on Mars and their source areas.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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