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  • 1
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    Orogeny Through Time (1997)
    London : The Geological Society
    Details
    Keywords: Orogenese ; orogeny
    Description / Table of Contents: Jean-Pierre Burg and Mary Ford: Orogeny through time: an overview / Geological Society, London, Special Publications, 121:1-17, doi:10.1144/GSL.SP.1997.121.01.01 --- Giorgio Ranalli: Rheology of the lithosphere in space and time / Geological Society, London, Special Publications, 121:19-37, doi:10.1144/GSL.SP.1997.121.01.02 --- P. G. Thomas, P. Allemand, and N. Mangold: Rheology of planetary lithospheres: a review from impact cratering mechanics / Geological Society, London, Special Publications, 121:39-62, doi:10.1144/GSL.SP.1997.121.01.03 --- P. Choukroune, J. N. Ludden, D. Chardon, A. J. Calvert, and H. Bouhallier: Archaean crustal growth and tectonic processes: a comparison of the Superior Province, Canada and the Dharwar Craton, India / Geological Society, London, Special Publications, 121:63-98, doi:10.1144/GSL.SP.1997.121.01.04 --- M. G. O’Dea, G. S. Lister, T. Maccready, P. G. Betts, N. H. S. Oliver, K. S. Pound, W. Huang, R. K. Valenta, N. H. S. Oliver, and R. K. Valenta: Geodynamic evolution of the Proterozoic Mount Isa terrain / Geological Society, London, Special Publications, 121:99-122, doi:10.1144/GSL.SP.1997.121.01.05 --- A. G. Milnes, O. P. Wennberg, Ø. Skår, and A. G. Koestler: Contraction, extension and timing in the South Norwegian Caledonides: the Sognefjord transect / Geological Society, London, Special Publications, 121:123-148, doi:10.1144/GSL.SP.1997.121.01.06 --- David R. Gray: Tectonics of the southeastern Australian Lachlan Fold Belt: structural and thermal aspects / Geological Society, London, Special Publications, 121:149-177, doi:10.1144/GSL.SP.1997.121.01.07 --- P. Rey, J.-P. Burg, and M. Casey: The Scandinavian Caledonides and their relationship to the Variscan belt / Geological Society, London, Special Publications, 121:179-200, doi:10.1144/GSL.SP.1997.121.01.08 --- V. N. Puchkov: Structure and geodynamics of the Uralian orogen / Geological Society, London, Special Publications, 121:201-236, doi:10.1144/GSL.SP.1997.121.01.09 --- Simon Lamb, Leonore Hoke, Lorcan Kennan, and John Dewey: Cenozoic evolution of the Central Andes in Bolivia and northern Chile / Geological Society, London, Special Publications, 121:237-264, doi:10.1144/GSL.SP.1997.121.01.10
    Pages: Online-Ressource (270 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1897799756
    URL: http://sp.lyellcollection.org/content/121/1
    Language: English
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    E-BOOK
  • 2
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    U–Pb zircon geochronology and phase equilibria modelling of HP-LT rocks in the Ossa-Morena Zone, Portugal (2020)
    Springer Berlin Heidelberg
    Details
    Publication Date: 2023-06-17
    Description: The Ossa-Morena Zone (OMZ) has a complex geological history including both Cadomian and Variscan orogenic events. Therefore, the OMZ plays an important role in understanding the geodynamic evolution of Iberia. However, the P–T–t evolution of the OMZ is poorly documented. Here, we combine structural and metamorphic analyses with new geochronological data and geochemical analyses of mafic bodies in Ediacaran metasediments (in Iberia known as Série Negra) to constrain the geodynamic evolution of the OMZ. In the studied mafic rocks, two metamorphic stages were obtained by phase equilibria modelling: (1) a high-pressure/low-temperature event of 1.0 ± 0.1 GPa and 470–510 °C, and (2) a medium-pressure/higher-temperature event of 0.6 ± 0.2 GPa and 550–600 °C. The increase in metamorphic temperature is attributed to the intrusion of the Beja Igneous Complex (around 350 Ma) and/or the Évora Massif (around 318 Ma). New U–Pb dating on zircons from the mafic rocks with tholeiitic affinity yields an age between 815 and 790 Ma. If the zircons crystallised from the tholeiitic magma, their age would set a minimum age for the pre-Cadomian basement. The ca. 800 Ma protolith age of HP-LT tholeiitic dykes with a different metamorphic history than the host Série Negra lead us to conclude that: (1) the HP-LT mafic rocks and HP-LT marbles with dykes were included in the Ediacaran metasediments as olistoliths; (2) the blueschist metamorphism is older than 550 Ma (between ca. 790 Ma and ca. 550 Ma, e.g., Cadomian).
    Description: European Research Council http://dx.doi.org/10.13039/501100000781
    Description: Ruprecht-Karls-Universität Heidelberg (1026)
    Keywords: ddc:551.701 ; Ossa-Morena zone ; U–Pb geochronology ; Phase equilibria modelling ; High pressure-low temperature metamorphism ; Cadomian basement
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 3
    Electronic Resource
    Electronic Resource
    Exhumation during crustal folding in the Namche-Barwa syntaxis (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Terra nova 9 (1997), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Geological observation in the eastern end of the Himalaya shows that the Asia/India Suture is folded. Metamorphic rocks derived from India occur structurally below the suture, in the core of a regional antiform. Isotopic and fission track dating establish cooling-exhumation of rocks from c.30 km depth within the last 4 Myr. We argue that exhumation is caused by ∼ 10 mm yr-1 erosion coeval with crustal scale folding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3121.1997.tb00001.x
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  • 4
    Electronic Resource
    Electronic Resource
    Multiple mantle sources during island arc magmatism: U–Pb and Hf isotopic evidence from the Kohistan arc complex, Pakistan (2002)
    Oxford, UK : Blackwell Science Ltd
    Terra nova 14 (2002), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: This paper presents high-precision U–Pb ages and initial Hf isotopic compositions of zircon from mafic to felsic rocks of the Kohistan Arc Complex, Pakistan. Three magmatic pulses tapping geochemically different reservoirs are distinguished. Partial melting of mantle with MORB-type isotopic characteristics generated 99–92-Ma-old magmas. Plutonism around 85 Ma tapped a more fertile mantle source, most likely consisting of a 〉600-Ma-old metasomatically enriched mantle, or of mantle contaminated by an old sedimentary component; 82-Ma-old felsic peraluminous dykes have MORB-type isotopic compositions considered to be inherited from remelting earlier magmas in the deep base of the arc. The isotopic results demonstrate several and rather rapid changes in melt source region during arc development. They also show that there was subordinate continental influence and negligible importance of slab components for the Hf budget during the generation of the Kohistan Arc Complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3121.2002.00432.x
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  • 5
    Electronic Resource
    Electronic Resource
    Syn-metamorphic nappe complex in the Rhodope Massif. Structure and kinematics (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Terra nova 8 (1996), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Mylonitic gneisses of the Bulgarian and Greek Rhodope were deformed under medium pressure-type metamorphism. The kinematic information contained in these gneisses shows that shear-deformation occurred during development of a nappe complex. Lithologies and metamorphic histories allow a lower (footwall) and an upper (hanging wall) terrane to be distinguished that define a crustal-scale duplex. As oceanic crust is involved, collision between two continental units with subsequent crustal thickening is inferred. The blocks would be Moesia to the north, and the Lower-Rhodope promontory to the south, which collided in the Mesozoic to early Cenozoic. The nappe complex is characterized by south to southwestward (foreland directed) piling-up and is associated with both coeval and subsequent extension. The late extension is associated with the establishment of a high temperature-low pressure metamorphic gradient and plutonism that predates, but makes a transition to, the lithospheric extension of the Aegean Arc.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3121.1996.tb00720.x
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  • 6
    Electronic Resource
    Electronic Resource
    Global movers and shakers (1996)
    [s.l.] : Nature Publishing Group
    Nature 381 (1996), S. 570-570 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN the seventeenth century, naturalists began to see structures (structume in Latin) in rocks. These structume were considered to be primary features, acquired while rock layers were being deposited, but the term was quickly extended to deformation features that nearly 200 years later were ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/381570a0
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  • 7
    Electronic Resource
    Electronic Resource
    Faulty weather (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 391 (1998), S. 454-454 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] There is a surrealist French song that laments the impossible love between a fish and a bird. It is a poetic stance reflecting that until recently the ‘material’ earth and the ‘immaterial’ atmosphere were thought to be worlds even more estranged than scientific orthodoxy ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35076
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  • 8
    Electronic Resource
    Electronic Resource
    Strain trajectories above the Main Central Thrust (Himalaya) in southern Tibet (1985)
    [s.l.] : Nature Publishing Group
    Nature 313 (1985), S. 388-390 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Lhasa- Khatmandu road, which runs along a deeply-eroded precipice, displays a spectacular section of the Main Central Sheet (Fig. 1). The uppermost rock unit comprises 3,000-4,000 m of dark metapelites interlayered with quartzites, calcschists and marbles, one to several tens of metres thick ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/313388a0
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  • 9
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    The 2014 Earthquake Model of the Middle East: seismogenic sources (2018)
    Details
    Publication Date: 2022-05-24
    Description: The Earthquake Model of Middle East (EMME) project was carried out between 2010 and 2014 to provide a harmonized seismic hazard assessment without country border limitations. The result covers eleven countries: Afghanistan, Armenia, Azerbaijan, Cyprus, Georgia, Iran, Jordan, Lebanon, Pakistan, Syria and Turkey, which span one of the seismically most active regions on Earth in response to complex interactions between four major tectonic plates i.e. Africa, Arabia, India and Eurasia. Destructive earthquakes with great loss of life and property are frequent within this region, as exemplified by the recent events of Izmit (Turkey, 1999), Bam (Iran, 2003), Kashmir (Pakistan, 2005), Van (Turkey, 2011), and Hindu Kush (Afghanistan, 2015). We summarize multidisciplinary data (seismicity, geology, and tectonics) compiled and used to characterize the spatial and temporal distribution of earthquakes over the investigated region. We describe the development process of the model including the delineation of seismogenic sources and the description of methods and parameters of earthquake recurrence models, all representing the current state of knowledge and practice in seismic hazard assessment. The resulting seismogenic source model includes seismic sources defined by geological evidence and active tectonic findings correlated with measured seismicity patterns. A total of 234 area sources fully cross-border-harmonized are combined with 778 seismically active faults along with background-smoothed seismicity. Recorded seismicity (both historical and instrumental) provides the input to estimate rates of earthquakes for area sources and background seismicity while geologic slip-rates are used to characterize fault-specific earthquake recurrences. Ultimately, alternative models of intrinsic uncertainties of data, procedures and models are considered when used for calculation of the seismic hazard. At variance to previous models of the EMME region, we provide a homogeneous seismic source model representing a consistent basis for the next generation of seismic hazard models within the region.
    Description: Published
    Description: 3465-3496
    Description: 6T. Studi di pericolosità sismica e da maremoto
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 10
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    Lithospheric-scale analogue modelling of collision zones with a pre-existing weak zone (2007)
    In:  Geological Society Special Publication 243: 277-294.
    Details
    Publication Date: 2007-10-08
    Description: Lithospheric-scale analogue experiments have been conducted to investigate the influence of strength heterogeneities on the distribution and mode of crustal-scale deformation, on the resulting geometry of the deformed area, and on its topographic expression. Strength heterogeneities were incorporated by varying the strength of the crust and upper mantle analogue layers and by implementing a weak plate or part-of-a-plate between two stronger ones. Three (brittle crust/viscous crust/strong viscous upper mantle) and four (brittle crust/viscous crust/brittle upper mantle/strong viscous upper mantle) layer models were confined by a weak silicone layer on one side in order to contain but not oppose lateral extrusion. Experimental results show that relative strength contrasts between converging plates and intervening weak plates control the location and the shape of deformation sites taken as collision orogens'. If the contrast is small, internal deformation of the strong plates through fore- and backthrusting occurs early in the deformation history. However, the bulk system is dominated by buckling that nucleates on the weak plate whose antiformal topography is highest; model Moho of the bordering stronger plates is deepest under these conditions. If the contrast is large, deformation remains localized within the weak plate for a larger amount of shortening and develops a root zone below a narrow deformation belt, which coincides with the locus of maximum topography. Implementing a buoyant, low-viscosity layer above the model Moho of the weak plate favours the development of asymmetric model orogens notwithstanding the initial symmetric setup. Once the asymmetry is established strain remains localized in thrust faults and ductile shear zones documenting foreland directed displacement of the model orogen. Such laterally and vertically irregular configurations have applications in continent-continent collision settings such as the Eastern Alps. First-order mechanical boundary conditions recognized from modelling to be favourable to the post early Oligocene tectonics of the Eastern Alps include: (1) subtle rather than high-strength contrasts between the Adriatic indentor and the strongly deformed region comprising Penninic and Austroalpine units to the north of it; (2) decoupling of Penninic continental upper crust from its substratum to allow for crustal-scale buckling of the Tauern Window; (3) weak mechanical behaviour of the European lower crust during collision to account for its constant thickness along the TRANSALP deep seismic transect; and (4) the direct continuation of the basal detachment underlying the fold and thrust belt in the hangingwall of the European plate with a wide ductile shear zone in the core of the orogen, which separates the European from the Adriatic plate.
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