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  • 1
    Online Resource
    Online Resource
    Earth history and palaeogeography (2017)
    Cambridge : Cambridge University Press
    Details Availability
    Keywords: Geology ; Paleogeography / Paleozoic
    Description / Table of Contents: Using full-colour palaeogeographical maps from the Cambrian to the present, this interdisciplinary volume explains how plate motions and surface volcanism are linked to processes in the Earth's mantle, and to climate change and the evolution of the Earth's biota. These new and very detailed maps provide a complete and integrated Phanerozoic story of palaeogeography. They illustrate the development of all the major mountain-building orogenies. Old lands, seas, ice caps, volcanic regions, reefs, and coal beds are highlighted on the maps, as well as faunal and floral provinces. Many other original diagrams show sections from the Earth's core, through the mantle, and up to the lithosphere, and how Large Igneous Provinces are generated, helping to understand how plates have appeared, moved, and vanished through time. Supplementary resources are available online, making this an invaluable reference for researchers, graduate students, professional geoscientists and anyone interested in the geological history of the Earth
    Type of Medium: Online Resource
    Pages: 1 online resource (317 pages) , digital, PDF file(s)
    ISBN: 9781107105324 , 9781316225523
    URL: https://doi.org/10.1017/9781316225523
    URL: http://www.gbv.de/dms/bowker/toc/9781107105324.pdf
    Language: English
    Note: Title from publisher's bibliographic system (viewed on 02 Dec 2016)
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  • 2
    Electronic Resource
    Electronic Resource
    Absolute dating of brittle fault movements: Late Permian and late Jurassic extensional fault breccias in western Norway (1997)
    Oxford, UK : Blackwell Science Ltd
    Terra nova 9 (1997), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: 40Ar/39Ar geochronological and palaeomagnetic dating methods applied to fault breccias in western Norway have isolated two brittle reactivation episodes of the syn-post-Caledonian, extensional Nordfjord-Sogn Detachment. These events, of latest Permian and latest Jurassic–Early Cretaceous ages, demonstrate temporal relationships between development of chemical remanent magnetism and partial resetting of Ar isotopic systems during distinct breccia-forming episodes. A third event of Carboniferous age was also identified in the breccias with the 40Ar/39Ar technique and is a relict unroofing signature inherited from the fault wall-rocks. These brittle faults are significant time markers and become relevant to interpretations of offshore seismic data which attempt to place ages on faults that have undergone multiple reactivation episodes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3121.1997.d01-21.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Early Proterozoic palaeomagnetic data from the Pechenga Zone (north-west Russia) and their bearing on Early Proterozoic palaeogeography (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 122 (1995), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: An Early Proterozoic palaeomagnetic signature (c. 2125 Ma), verified by a positive conglomerate test, is recorded in the Kuetsyarvi Formation, Pechenga Group (north-west Russia), but the majority of the palaeomagnetic directions observed in the Pechenga Group lithologies reflect a low-grade remagnetization event probably linked with the Late Precambrian Baikalian Orogeny which affected north-west Russia and northern Norway. Secondary pyrrhotite is the dominant remanence carrier in the uppermost formations of the Pechenga Group.Palaeomagnetic poles from the Kuetsyarvi Formation differ somewhat or partially overlap with coeval palaeomagnetic poles from other tectonomagmatic provinces in northern Fennoscandia, but it is premature at this stage to speculate on intraplate movements during the Early Proterozoic. Besides, the Kuetsyarvi Formation probably developed during an early phase of intracontinental rifting along the northern margin of Fennoscandia, similar to the present-day East African rift. Hence younger intercontinental rifting, possible seafloor-spreading and subsequent convergence would remain undetected by our palaeomagnetic data. Palaeolatitude estimates from the Kuetsyarvi Formation suggest that the Pechenga region was located in latitudes of around 20° to 30° during the 2100–2200 Ma interval. These low-latitude estimates are supported by the sedimentary record in the Pechenga region which is characterized by red beds and evaporites.Comparison of Fennoscandian palaeomagnetic poles with coeval poles from the Slave and Superior cratons (Laurentia) questions previously publicized supercontinental configurations. A close relationship between Fennoscandia and Early Proterozoic Laurentian Provinces is conceivable from palaeomagnetic data, but, given the lack of longitudinal control as well as the choice of hemisphere, such postulates are tentative at best on purely palaeomagnetic grounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1995.tb07011.x
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  • 4
    Electronic Resource
    Electronic Resource
    The Lower Palaeozoic apparent polar wander path for Baltica: palaeomagnetic data from Silurian limestones of Gotland, Sweden (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 107 (1991), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Well-dated and undeformed Silurian (Lower Wenlock) limestones from Gotland, southern Sweden, yield two stable remanence components following detailed thermal and alternating-field demagnetization studies.(1) A low blocking-temperature/coercivity magnetization, termed L, delineated below 250d̀C/10mT, is oriented parallel to the present Earth's field (Dec. 001, Inc. +67, n= 4 sites, a95= 16d̀).(2) A higher blocking-temperature/coercivity magnetization, termed H, unblocked between 250-400d̀C/10-35mT, has a NNE declination and shallow negative inclination (Dec. 025, Inc. -19, n= 5 sites, a95= 5d̀). This H component direction compares favourably with a previous result from Gotland based upon blanket cleaning.Given a lack of evidence for subsequent geological heating (Conodont Alteration Index = 1-1.5), or pervasive palaeomagnetic overprinting, the H palaeopole is regarded as reliable and primary/early diagenetic in origin (19d̀S, 352d̀E, dp/dm 3/5). The only other well-constrained Mid-Silurian pole from Baltica, that from the Ringerike Sandstone of the Oslo district, is in excellent agreement with the Gotland data. These combined poles resolve previous problems regarding the shape and time-calibration of Silurian apparent polar wander relative to Baltica.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1991.tb00832.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A revised Palaeozoic apparent polar wander path for Southern Britain (Eastern Avalonia) (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 104 (1991), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A revised apparent polar wander path (APWP) is presented for Palaeozoic Southern Britain. the new path, based on a structural reinterpretation of existing data combined with new data from Wales, differs significantly from previous estimates in the following ways:(1) the locus of the Ordovician path segment is extended by approximately 25 degrees of arc;(2) revised time-calibration of the APWP suggests more Ordovician APW than previously calculated; and(3) the new path implies Middle Ordovician separation across the British sector of lapetus to be greater than previous palaeomagnetic estimates based on APWP analyses (cc. 3300 km; Northern Britain cc. 15S, Southern Britain c. 45S).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1991.tb02506.x
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  • 6
    Electronic Resource
    Electronic Resource
    A palaeomagnetic study of the Builth Wells-Llandrindod Wells Ordovician Inlier, Wales: palaeogeographic and structural implications (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 105 (1991), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Discrepancies exist in the Southern British Ordovician palaeomagnetic data set with individual studies indicating either high southerly or temperate southerly palaeolatitudes. Although previous palaeomagnetic investigations from the Builth inlier have delineated a three-component remanence structure, doubts have been raised concerning (i) the magnetization age of the supposed ‘primary’component (P); (ii) the structural setting of the sampling area (Llanelwedd quarry) within a zone of strike-slip deformation; and (iii) whether detailed step-wise demagnetization has fully separated the various magnetization components.In addressing these problems, we present new palaeomagnetic results as follows: (i) a positive palaeomagnetic conglomerate test establishing a pre-Late Llanvirn age for component (P); (ii) an enlarged geographic sampling embracing several tectonic domains indicating that relative rotations linked to strike–slip tectonism are minor within the Builth sampling area; and (iii) evidence that component (P) is uncontaminated by overprints at some sites suggesting the resulting palaeolatitude of 35°S to be representative for the Builth inlier.We also present evidence for local syn-volcanic deformation within Llanvirn volcanics and for intrusion-related deformation of Llanvirn shales.When the revised Llanvirn pole from the inlier (3°S, 4°E) is combined with other data from Southern Britain in a statistical spline analysis, a mean palaeolatitude of 44.5°S is calculated for Builth in Llanvirn times. A palaeoreconstruction for 468–474 Ma (c. Mid-Llanvirn) is presented utilizing this analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1991.tb06727.x
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  • 7
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    A Precambrian microcontinent in the Indian Ocean. (2017)
    Details
    Publication Date: 2021-05-19
    Description: The Laccadive–Chagos Ridge and Southern Mascarene Plateau in the north-central and western Indian Ocean, respectively, are thought to be volcanic chains formed above the Réunion mantle plume1 over the past 65.5 million years2,3. Here we use U–Pb dating to analyse the ages of zircon xenocrysts found within young lavas on the island of Mauritius, part of the Southern Mascarene Plateau. We find that the zircons are either Palaeoproterozoic (more than 1,971 million years old) or Neoproterozoic (between 660 and 840 million years old). We propose that the zircons were assimilated from ancient fragments of continental lithosphere beneath Mauritius, and were brought to the surface by plume-related lavas. We use gravity data inversion to map crustal thickness and find that Mauritius forms part of a contiguous block of anomalously thick crust that extends in an arc northwards to the Seychelles. Using plate tectonic reconstructions, we show that Mauritius and the adjacent Mascarene Plateau may overlie a Precambrian microcontinent that we call Mauritia. On the basis of reinterpretation of marine geophysical data4, we propose that Mauritia was separated from Madagascar and fragmented into a ribbon-like configuration by a series of mid-ocean ridge jumps during the opening of the Mascarene ocean basin between 83.5 and 61 million years ago.We suggest that the plume-related magmatic deposits have since covered Mauritia and potentially other continental fragments.
    Description: PDF is Published online 23 Feb 2013 version
    Description: Published
    Keywords: Palaeomagnetism ; Petrology ; Tectonics ; Volcanology ; Zircon
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.223-227
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  • 8
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    The Palaeozoic Variscan oceans revisited (2017)
    Elsevier
    In:  Gondwana Research, 48 . pp. 257-284.
    Details
    Publication Date: 2020-04-08
    Description: Geological evidence, supported by biogeographical data and in accord with palaeomagnetic constraints, indicates that “one ocean” models for the Variscides should be discarded, and confirms, instead, the existence of three Gondwana-derived microcontinents which were involved in the Variscan collision: Avalonia, North Armorica (Franconia and Thuringia subdivided by a failed Vesser Rift), and South Armorica (Central Iberia/Armorica/Bohemia), all divided by small oceans. In addition, parts of south-eastern Europe, including Adria and Apulia, are combined here under the new name of Palaeo-Adria, which was also Peri-Gondwanan in the Early Palaeozoic. Oceanic separations were formed by the break-up of the northern Gondwana margin from the Late Cambrian onwards. Most of the oceans or seaways remained narrow, but – much like the Alpine Cenozoic oceans – gave birth to orogenic belts with HP-UHP metamorphism and extensive allochthons: the Saxo-Thuringian Ocean between North and South Armorica and the Galicia-Moldanubian Ocean between South Armorica and Palaeo-Adria. Only the Rheic Ocean between Avalonia and peri-Gondwana was wide enough to be unambiguously recorded by biogeography and palaeomagnetism, and its north-western arm closed before or during the Emsian in Europe. Ridge subduction under the northernmost part of Armorica in the Emsian created the narrow and short-lived Rheno-Hercynian Ocean. It is that ocean (and not the Rheic) whose opening and closure controlled the evolution of the Rheno-Hercynian foldbelt in south-west Iberia, south-west England, Germany, and Moravia (Czech Republic). Devonian magmatism and sedimentation set within belts of Early Variscan deformation and metamorphism are probably strike-slip-related. The first arrival of flysch on the forelands and/or the age of deformation of foreland sequences constrains the sequential closure of the Variscan seaways (Galicia-Moldanubian in the Givetian; Saxo-Thuringian in the Early Famennian; Rheno-Hercynian in the Tournaisian). Additional Mid- to Late Devonian and (partly) Early Carboniferous magmatism and extension in the Rheno-Hercynian, Saxo-Thuringian and Galicia-Moldanubian basins overlapped with Variscan geodynamics as strictly defined. The Early Carboniferous episode was the start of episodic anorogenic heating which lasted until the Permian and probably relates to Tethys rifting.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.gr.2017.03.005
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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