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  • 1
    Online Resource
    Online Resource
    The NE Atlantic region : a reappraisal of crustal structure, tectonostratigraphy and magmatic evolution (2017)
    London : The Geological Society
    Details Availability
    Keywords: Historical geology ; Geology History ; Continental margins History ; Geology Research ; Continental margins Research ; Geodynamics ; Continental margins ; Continental margins ; Research ; Geodynamics ; Geology ; Geology ; Research ; Historical geology ; North Atlantic Ocean ; History ; Atlantischer Ozean Nordost ; Kontinentalrand ; Rift ; Extension ; Sedimentationsbecken ; Plattentektonik ; Island-Färöer-Rücken ; Kontinentalrand ; Rifting ; Störung ; Becken ; Tektonik ; Europäisches Nordmeer ; Mittelatlantischer Rücken Nord ; Reykjanesrücken ; Shetlandinseln ; Jan-Mayen-Rücken ; Kolbeinsey-Rücken ; Norwegensee ; Grönlandsee ; Seafloor spreading ; Aufsatzsammlung
    Description / Table of Contents: [I].Article:The NE Atlantic region: a reappraisal of crustal structure, tectonostratigraphy and magmatic evolution - an introduction to the NAG-TEC project /Gwenn Péron-Pinvidic, John R. Hopper, Martyn Stoker, Carmen Gaina, Thomas Funck, Uni E. Árting and Johannes Cornelis Doornenbal.
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (455 Seiten) , Illustrationen, Karten
    ISBN: 9781786203700 , 1786203707
    Series Statement: Geological Society special publication no. 447
    URL: http://sp.lyellcollection.org/content/447/1
    URL: http://sp.lyellcollection.org/content/447/1
    URL: https://geoscienceworld.org/books/book/2069
    URL: https://sp.lyellcollection.org/content/447/1
    URL: https://doi.org/10.1144/SP447
    DDC: 551.70091633
    Language: English
    Note: Includes bibliographical references and index
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  • 2
    Online Resource
    Online Resource
    The formation and evolution of Africa : a synopsis of 3.8 Ga of earth history (2011)
    Details Availability
    Keywords: Geology ; Geologie ; Aufsatzsammlung ; Afrika ; Kontinentale Erdkruste ; Entstehung ; Tektogenese
    Description / Table of Contents: The African continent preserves a long geological record that covers almost 75% of Earth's history. The Pan-Africanorogeny (c. 600-500 Ma) brought together old continental kernels (West Africa, Congo, Kalahari and Tanzania) to form Gondwana and subsequently the supercontinent Pangaea by the late Palaeozoic. The break-up of Pangaea since the Jurassic and Cretaceous, primarily through opening of the Central Atlantic, Indian, and South Atlantic oceans, in combination with the complicated subduction history to the north, gradually shaped the African continent. This volume contains 18 contributions that discuss the geology of Africa from the Archaean to the present day. It celebrates African geology in two ways: first, it highlights multidisciplinary Earth science research by viewing the formation and evolution of Africa from 18 different angles; second, it celebrates the work of Kevin Burke and Lewis Ashwal and portrays the wide range of interests and research angles that have characterized these two scientists throughout their careers, working in Africa, and studying African geology--
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (VI, 378 Seiten)
    ISBN: 1862393354 , 9781862393356
    Series Statement: Geological Society special publication 357
    URL: http://sp.lyellcollection.org/content/357/1
    DDC: 556
    Language: English
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  • 3
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    Tectonic evolution of the southwest Pacific using constraints from backarc basins (2003)
    Geological Society of America
    In:  In: Evolution and Dynamics of the Australian Plate. Geological Society of America Special Papers, 372 . Geological Society of America, Boulder, Colo., pp. 343-359.
    Details
    Publication Date: 2020-08-03
    Description: We present a revised model for the formation of southwest Pacific backarc basins from 120 Ma to the present day. Our aim is to improve our understanding of the tectonic regime operating in the region and its consequences for global plate motions. Such an understanding helps explain present-day structures observed on the continental and oceanic lithosphere and the underlying mantle. Regional plate reconstructions were created using gravity and magnetic data from backarc basins, plate-circuit closure, global tomography and existing geological data. Our model predicts convergence between the Australian and Pacific Plates along the Norfolk Ridge from 120 to 100 Ma, followed by the fragmentation of East Gondwana. East-dipping subduction east of Australia was initiated at ca 90 Ma along the Loyalty-Three Kings Ridge and may have trapped Cretaceous quiet-zone crust In the Norfolk Basin. The inception of this subduction system may have provided a driving mechanism for the opening of the Tasman Sea by means of slab pull. A jump in subduction to the east was subsequently initiated along a west-dipping subduction system at ca 45 Ma driven by the collision of the Loyalty Arc with New Caledonia. Consequently, spreading in the North Loyalty Basin occurred by anticlockwise rotation of the subduction hinge between chrons 20 and 16 (43.8–35.3 Ma). This was concurrent to Norfolk Basin opening and formation of the Cook Fracture Zone. Backarc-basin formation then transferred to the South Fiji Basin where magnetic anomalles from chron 12 to 7N (30.9–25.2 Ma) have been identified as two contemporaneous triple junctions. The complex spreading regime witnessed in the South Fiji Basin appears analogous to the North Fiji Basin and may represent the surface expression of a hot, shallow mantle consistent in character to a superswell. The South Fiji Basin ceased forming at ca 25 Ma in response to a major plate reorganisation coinciding with the inception of the Alpine Fault, docking of the Ontong Java Plateau with the Melaneslan Arc and transpressional obduction of the Northland ophiollte. A lull in basin formation throughout most of the Miocene was followed by the reinitiation of backarc basin formation in the Lau Basin (during the past ∼7 million years) and North Fiji Basin (during the past ∼10 million years). All these apparent episodes of backarc-basin formation during the past 45 million years are possibly related to mantle-slab interaction at the 670 km discontinuity.
    Type: Book chapter , NonPeerReviewed
    Format: text
    DOI: 10.1130/0-8137-2372-8.343
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  • 4
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    Intricate oceanic plate boundaries revealed in the first World Seafloor Map (2021)
    In:  [Talk] In: Reunion des Sciences de la Terre 2021, 01.11.-05.11.2021, Lyon, France .
    Details
    Publication Date: 2021-12-15
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 5
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    Intraoceanic subduction spanned the Pacific in the Late Cretaceous-Paleocene (2017)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2017-11-09
    Description: The notorious ~60° bend separating the Hawaiian and Emperor chains marked a prominent change in the motion of the Pacific plate at ~47 Ma (million years ago), but the origin of that change remains an outstanding controversy that bears on the nature of major plate reorganizations. Lesser known but equally significant is a conundrum posed by the pre-bend (~80 to 47 Ma) motion of the Pacific plate, which, according to conventional plate models, was directed toward a fast-spreading ridge, in contradiction to tectonic forcing expectations. Using constraints provided by seismic tomography, paleomagnetism, and continental margin geology, we demonstrate that two intraoceanic subduction zones spanned the width of the North Pacific Ocean in Late Cretaceous through Paleocene time, and we present a simple plate tectonic model that explains how those intraoceanic subduction zones shaped the ~80 to 47 Ma kinematic history of the Pacific realm and drove a major plate reorganization.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Seawater chemistry driven by supercontinent assembly, breakup, and dispersal (2013)
    Geological Society of America (GSA)
    In: Geology
    Details
    Publication Date: 2013-07-23
    Description: Global oceans are known to have alternated between aragonite and calcite seas. These oscillations reflect changes in the Mg/Ca ratios of seawater that control biomineralization and the composition of marine carbonates, and are thought to be caused mainly by the time dependence of crustal accretion at mid-ocean ridge crests and the associated high-temperature mid-ocean ridge fluid flux. Here we use global ocean basin reconstructions to demonstrate that the fluctuations in hydrothermal ocean inputs are instead caused by the gradual growth and destruction of mid-ocean ridges and their relatively cool flanks during long-term tectonic cycles, thus linking ocean chemistry to off-ridge low-temperature hydrothermal exchange. Early Jurassic aragonite seas were a consequence of supercontinent stability and a minimum in mid-ocean ridge length and global basalt alteration. The breakup of Pangea resulted in a gradual doubling in ridge length and a 50% increase in the ridge flank area, leading to an enhanced volume of basalt to be altered. The associated increase in the total global hydrothermal fluid flux by as much as 65%, peaking at 120 Ma, led to lowered seawater Mg/Ca ratios and marine hypercalcification from 140 to 35 Ma. A return to aragonite seas with preferential aragonite and high-Mg calcite precipitation was driven by pronounced continental dispersal, leading to progressive subduction of ridges and their flanks along the Pacific rim.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 7
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    Seawater chemistry driven by supercontinent assembly, breakup and dispersal: REPLY (2014)
    Geological Society of America (GSA)
    In: Geology
    Details
    Publication Date: 2014-04-19
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 8
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    Continental crust beneath Iceland [Earth, Atmospheric, and Planetary Sciences] (2015)
    National Academy of Sciences
    Details
    Publication Date: 2015-04-15
    Description: The magmatic activity (0–16 Ma) in Iceland is linked to a deep mantle plume that has been active for the past 62 My. Icelandic and northeast Atlantic basalts contain variable proportions of two enriched components, interpreted as recycled oceanic crust supplied by the plume, and subcontinental lithospheric mantle derived from...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 9
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    Late Cretaceous To Present Day Formation Of Oceanic Crust Between Australia, Antarctica And Pacific Illustrated By Reconstructed Free-Air Gravity And Palaeo-Bathymetry (2006)
    In:  EPIC32nd SCAR Open Science Conference, 12-14 Jul, Hobart, Australia.
    Details
    Publication Date: 2019-07-17
    Description: On a long geological timescale, first-order changes in palaeo-climate, palaeo-oceanography and marine sedimentation are controlled by plate tectonics through the distribution of land masses and ocean basins (geometry and geography), the opening and closing of oceanic gateways, and changes in topography both on land and at sea. The oceanic crustal age and distribution south, southeast and east of Australia illustrates the complex kinematics of major tectonic plates (Australia, Antarctica and Pacific), microplates (several blocks of the Lord Howe Rise, Campbell Plateau and Chatham Rise), and the intervening triple junctions that led to the formation of ridge jumps, long fracture zones and transform faults, and trenches. Several up-to-date models for the evolution of individual oceanic basins in this region have been merged with a South Pacific high-resolution tectonic model in order to document a detailed tectonic history of this region.Densely spaced isochrons (1 million years) are derived from the kinematic model and refined using satellite-derived free-air gravity anomalies and bathymetry, and magnetic anomalies from ship track data. The isochrons are used to construct polygons that depict the amount of oceanic lithosphere attached to the active tectonic plates at a certain geological time. Palaeo-age and palaeo-bathymetric grids are calculated based on the new dense set of isochrons. We present animated reconstructions and use them to highlight the importance of bathymetric features and the distribution of land and sea in the opening of the Tasman gateway and subsequent development of the Antarctic Circumpolar Current (ACC).
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 10
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    Exploration of the East Greenland Margin A project proposal to evaluate and model Palaeogene source rocks (2009)
    In:  EPIC3AAPG.
    Details
    Publication Date: 2019-07-16
    Description: The critical part for future success in exploration in the Arctic is the access to first-class geophysical and geological data and their proper interpretation. As a consequence of the almost permanent sea ice coverage only limited access to qualitatively satisfactory 2D/3D seismic data and wells exists off the coast of eastern Greenland. However, to get a quantitative estimate on the petroleum potential of this region an integrated approach using new seismic reflection, aeromagnetic, gravity, and borehole data from Ocean Drilling Program (ODP) Leg 151, Site 913 (Fig. 1) applied to basin modeling might be an economic, environment friendly and save contribution. Our main goal is to work out an integrated study on Paleogene source rocks with particular focus on the Azolla freshwater fern event during the early middle Eocene. Source rocks from this time interval from the circum Arctic areas have been suggested by several authors (Mann et al. 2009). Based on the scientific drilling results and source rock modeling in the central Arctic Ocean (IODP-ACEX 2004, Mann et al. 2009), organic-rich sediments deposited under anoxic conditions during Eocene times raised the interest towards a basin-wide prolific Tertiary source rock north of the Arctic Circle. From the few data available along the north-eastern Greenland margin, an analogue to the anoxic environment in the central Arctic can be assumed for the isolated Greenland basins too. This is inferred from the contemporary occurrence of Azolla freshwater fern and organic-rich deposits (〉 5 % TOC) in early Eocene sediments of ODP Hole 913B. By integrating geophysical and geological data from the East Greenland margin into state-of-the-art basin modeling tools, we will quantitatively evaluate the potential of this early Eocene source rock, i.e. we will provide a 3D-view on the distribution, thickness and quality of this material. In addition, processes of formation and cracking of petroleum fractions in the Eocene source rock and their expulsion will be investigated. The results from these latter activities combined with a simple thermal burial history modeling will provide unique additional information on hydrocarbon generation products and potential charge from the Eocene source rocks.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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