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  • 1
    Call number: G 7238/3
    In: Géologie des aires oceaniques
    Type of Medium: Monograph available for loan
    Pages: VIII, 235 S. : graph. Darst.
    Series Statement: Géologie des aires océaniques 3
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    ISSN: 1573-0581
    Keywords: Southwest Indian Ridge ; bathymetry ; segmentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Bathymetric data along the Southwest Indian Ridge (SWIR) between 57°E and 70° E have been used to analyze the characteristics of thesegmentation and the morphotectonic variations along this ridge. Higheraxial volcanic ridges on the SWIR than on the central Mid-Atlantic Ridge(MAR) indicate that the lithosphere beneath the SWIR axis that supportsthese volcanic ridges, is thicker than the lithosphere beneath the MAR. Astronger/thicker lithosphere allows less along-axis melt flow andenhances the large crustal thickness variations due to 3D mantle upwellings.Magmatic processes beneath the SWIR are more focused, producing segmentsthat are shorter (30 km mean length) with higher along-axis relief (1200 mmean amplitude) than on the MAR. The dramatic variations in the length andamplitude of the swells (8–50 km and 500–2300 m respectively),the height of axial volcanic ridges (200–1400 m) and the number ofvolcanoes (5–58) between the different types of segments identifiedon the SWIR presumably reflect large differences in the volume, focusing andtemporal continuity of magmatic upwelling beneath the axis. To the east ofMelville fracture zone (60°42′ E), the spreading center isdeeper, the bathymetric undulation of the axial-valley floor is less regularand the number of volcanoes is much lower than to the west. The spreadingsegments are also shorter and have higher along-axis amplitudes than to thewest of Melville fracture zone where segments are morphologically similar tothose observed on the central MAR. The lower magmatic activity together withshorter and higher segments suggest colder mantle temperatures withgenerally reduced and more focused magma supply in the deepest part of thesurvey area between 60°42′ E and 70° E. The non-transformdiscontinuities show offsets as large as 70 km and orientations up toN36° E as compared to the N0° E spreading direction. We suggest thatin regions of low or sporadic melt generation, the lithosphere neardiscontinuities is laterally heterogeneous and mechanically unable tosustain focused strike-slip deformation.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-0581
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Long-range sidescan sonar (GLORIA) data over Porto and Vigo Seamounts collected in 1978 has been re-interpreted in the light of SEABEAM bathymetric surveys conducted in 1982. The application of quantitative bathymetric information enables the interpreter to allow for artefacts inherent in the GLORIA data and to separate topography-related primary backscattering variations on the sonographs from more subtle changes that result from textural, slope and outcrop effects. The distinctions are made easier when slant-range corrected GLORIA data are available. Use of the combined survey data to precisely locate seismic profiling tracks and to identify likely areas of outcrop has allowed refined geological maps of the seamounts to be drawn and regional fault trends detected. The overall outline of the seamounts appears strongly fault-controlled. Porto and Vigo Seamounts are made up of the same geological formations and have had a similar structural history since their uplift as continental fault blocks in the Late Cretaceous to Middle Eocene period. Ravines that dissect the presumably lithified scarps bounding the seamounts may be relict features but still appear to control sediment input to gulley and channel systems in the surrounding topography. Sedimentary ridges associated with the seamounts represent anomalously thick sequences of post-Eocene material and probably result from interaction of downslope sedimentary processes and contour-following boundary currents.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Ocean dynamics 34 (1981), S. 263-272 
    ISSN: 1616-7228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Alle zur Verfügung stehenden Lotlinien wurden benutzt um Tiefenkarten des antarktischen Meeresgrundes zwischen 63° W and 60° E (Abb. 1 und 2) zu erstellen. Die vorherrschenden untermeerischen Merkmale des Gebietes werden skizziert und beschrieben. Die Morphologie des Meeresbodens spiegelt die primäre Tektonik und sekundäre Prozesse wider. Die linienförmige Anordnung von Seamounts und die Stufen am Astrid Ridge können als Spuren von Bruchzonen gedeutet werden. Untermeerische Canyons sind auf dem Rand der Dronning Maud weit verbreitet, und Rutschungsvorgänge haben außerdem den Kontinentalschelfabhang umfassend erodiert. Strömungen haben wahrscheinlich das meiste von diesem Schüttungsmaterial in die Weddell Sea transportiert. Die vorherrschende morphologische Formungskraft auf den Kontinentalschelf ist Eiserosion. Der Crary Trough ist das Ergebnis einer Ausräumung durch das auf dem südlichen Weddell Schelf nordwärts fließende Eis während der maximalen Ausdehnung des Inlandeises im Pleistozän.
    Abstract: Résumé Tous les sondages disponibles ont été utilisés pour dresser (Fig. 1 et 2) les cartes bathymétriques des fonds marins antarctiques entre 63° W et 60° E. Les principaux reliefs sous-marins du secteur sont délimités et décrits. Leur morphologie reflète l'influence conjointe des phénomènes tectoniques et des processus sédimentaires. Les alignements de monts sous-marins et les escarpements du Massif Astrid sont interprétés comme des traces de zones de fracture. Les canyons sous-marins prévalent sur la marge de Dronning Maud dont la pente a été intensément érodée par des processus gravitaires. Les courants de contour ont probablement entraîné la majeure partie des débris dans la Mer de Weddell. Le creusement glaciaire est le processus morphogénique dominant sur la plate-forme continentale. Le Fossé Crary résulte de l'excavation opérée sur la plate-forme méridionale de Weddell par la glace s'écoulant vers le nord lors de l'extension maximale de l'inlandsis.
    Notes: Summary All available sounding lines were used to construct (Figs. 1 and 2) bathymetric charts of the Antarctic sea floor between 63° W and 60° E. Major submarine features of the area are delineated and described. The morphology of the sea bed reflects both tectonic central and secondary processes. Traces of fracture zones are seen in seamount alignments and as scarps on Astrid Ridge. Submarine canyons are prevalent on the Dronning Maud margin and in addition gravity processes have extensively eroded the continental slope. Contour currents have probably swept most of this debris into the Weddell Basin. Ice scour is the predominant morphological force on the continental shelf. The Crary Trough is the result of excavation by northward flowing ice on the southern Weddell shelf during the Pleistocene maximal extension of the inland ice.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Ocean dynamics 32 (1979), S. 77-87 
    ISSN: 1616-7228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Alle verfügbaren Lotlinien wurden benutzt, um allgemeine (Abb. 2) und örtliche (Abb. 3, 4, 5) Tiefenkarten des antarktischen Meeresbodens zwischen 136° E und 147° E (Adélieland, südlicher Indischer Ozean) herzustellen. Größere Komplexe der Bodengestaltung dieses Gebietes an der Küste und unter Wasser werden abgegrenzt und beschrieben (Abb. 6 und 7). Die Morphologie des Meeresbodens steht danach in deutlichem Zusammenhang mit tektonischen und klimatischen Einflüssen. Komplizierte Verwerfungen haben die Gondwana-Kruste aufgebrochen und eine Reihe von tiefen Becken geschaffen, die durch unregelmäßige Plateaus voneinander getrennt sind. Die große Ausdehnung des Inland-Eises während des Pleistozäns hat folgende morphologische Auswirkungen gehabt: (1) die Übertiefung von Tälern; (2) die Entstehung von äußeren Bänken (Endmoränen) und (3) die ungewöhnliche Tiefe des Schelfrandes durch unvollständigen post-glazialen isostatischen Ausgleich.
    Abstract: Résumé Les cartes bathymétriques d'ensemble (Fig. 2) et régionales (Fig. 3, 4 et 5) du fond de l'océan Antarctique entre 136° E et 147° E (Terre Adélie, océan Indien austral) furent dessinées à l'aide de toutes les sondes disponibles. Les phénomènes littoraux et sous-marins les plus importants du domaine sont cartographiés et décrits (Fig. 6 et 7). La morphologie sous-marine est clairement en relation avec les influences tectoniques et climatiques. Un faillage complexe a disloqué le socle du Gondwana en une série de bassins profonds séparés par des plateaux irréguliers. Au Pleistocène, l'extension maximale de l'inlandsis produisit les effets morphologiques suivants: (1) le surcreusement des dépressions, (2) la construction des bancs bordiers (moraines terminales), et (3) le maintien du rebord de la plate-forme à des profondeurs anormales par suite d'un réajustement isostatique post-glaciaire imparfait.
    Notes: Summary All available sounding lines were used to construct general (Fig. 2) and local (Figs. 3, 4 and 5) bathymetric charts of the Antarctic sea floor between 136° E and 147° E (Terre Adélie, Southern Indian Ocean). Major coastal and submarine features of the area are delineated and described (Figs. 6 and 7). The sea bed morphology is related clearly to the tectonic and climatic influences. Complex faulting has ruptured the Gondwana crust into a series of deep basins separated by irregular plateaus. The Pleistocene maximal extension of inland ice produced the following morphological effects: (1) the overdeepening of valleys, (2) the construction of outer banks (terminal moraines), and (3) the unusual depth of the shelf edge by incomplete post-glacial isostatic readjustment.
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  • 6
    Publication Date: 1965-06-01
    Print ISSN: 0025-3227
    Electronic ISSN: 1872-6151
    Topics: Geosciences
    Published by Elsevier
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  • 7
  • 8
    Publication Date: 1981-11-01
    Print ISSN: 0012-0308
    Electronic ISSN: 1616-7228
    Topics: Geosciences , Physics
    Published by Springer
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  • 9
    Publication Date: 1979-03-01
    Print ISSN: 0012-0308
    Electronic ISSN: 1616-7228
    Topics: Geosciences , Physics
    Published by Springer
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  • 10
    Publication Date: 2005-07-01
    Print ISSN: 1266-5304
    Electronic ISSN: 1957-777X
    Topics: Geography , Geosciences
    Published by OpenEdition
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