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  • Weitere Quellen  (3)
  • VAE 880  (3)
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  • American Institute of Physics (AIP)
  • Institut für Meereskunde
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  • 2010-2014  (3)
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  • 1
    Publikationsdatum: 2021-03-29
    Beschreibung: The major objective of the study is to investigate how near-surface sediment structures and other geological aspects control the nature and occurrence of cold fluid seepage. Mainly high resolution multichannel seismic data and swatch bathymetry data were used to study nearsurface seismostratigraphy, structure and seismic fluid-indicating features in two different fluid seepage provinces: Campeche Knolls, southern Gulf of Mexico and the frontal Makran, offshore Pakistan. The two areas have fundamentally different tectonic settings: The Campeche Knolls, southern Gulf of Mexico represents a passive margin influenced by salt tectonism, while the frontal Makran is the most basinward part of the Makran accretionary prism, characterized by plate subduction, sediment accretion, thrust faulting and development of sediment imbricate slices. However, they share quite a few similarities in shallow sediment structures and fluid seepage patterns...
    Beschreibung: thesis
    Schlagwort(e): 551.23 ; 553.28 ; 550 ; TSZ 100 ; VAE 880 ; TSZ 200 ; Atlantischer Ozean {Geophysik} ; Passive und aktive Kontinentalränder {Geologie} ; Indischer Ozean {Geophysik}
    Sprache: Englisch
    Materialart: monograph , publishedVersion
    Format: 125 S.
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2021-03-29
    Beschreibung: Giant shear processes shaped Africa's southern margin during the breakup of the supercontinent Gondwana. They acted along a more than 1000 km long transform fault, whose remnant structure the Agulhas-Falkland Fracture Zone stretches today from the Falkland Plateau to the southeastern margin of Africa. A study of the processes which initiated such a long-offset transform fault and acted during their active phase is essential to understand how this sheared margin developed. Africa’s southern margin is not only one of the best examples to study the sharp continent-ocean-transition zones, the marginal ridge, fracture zone, and basin structures usually associated with transform margins, but it provides the unique opportunity to study how excessive magmatic processes acted which formed a Large Igneous Province at a sheared margin. In this thesis, I use seismic refraction, seismic reflection data and plate-tectonic reconstructions to investigate the structure and dynamics of this margin. These are ideal methods as they lead to high-quality velocity-depth models showing the present-day structure across the margin and provide timing and geometries by means of plate kinematics...
    Beschreibung: thesis
    Schlagwort(e): 550 ; TSR 000 ; TSZ 200 ; VAE 880 ; VAE 890 ; VER 100 ; VEZ 200 ; Südafrika {Geophysik} ; Indischer Ozean {Geophysik} ; Passive und aktive Kontinentalränder {Geologie} ; Ozeanische Kruste {Tektonik} ; Republik Südafrika {Geologie} ; Indischer Ozean {Geologie}
    Sprache: Englisch
    Materialart: monograph , publishedVersion
    Format: 157 S.
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 2021-03-29
    Beschreibung: Integrated studies of conjugate margins provide important constraints for the sequence of events of synrift tectonic and magmatic processes. The northeast Greenland margin is investigated based on seismic refraction data acquired across the continent ocean transition zone between the Jan Mayen and Greenland fracture zones. Transects of seismic velocity models reveal a clear segmentation of the margin, which is compatible with the potential field data. A crucially important observation is a thick high velocity lower crustal body which clearly decreases northwards. Excessive magmatism is inferred to have occurred during long-term rifting in the south, while reduced syn-rift intrusions account for the norhtern magma-starved margin. Asymmetries and variations across the adjacent and conjugate East Greenland and Norwegian margins, are controversially discussed in terms of the origin of the lower crustal body and magnetic spreading anomalies. Three hypothetical scenarios for the timing and formation of the high velocity lower crustal body are presented. A comprehensive subsidence analysis is established which quantifies the amount of magmatic underplating.
    Beschreibung: thesis
    Schlagwort(e): 551.136 ; VAE 880 ; TSY 100 ; VBM 000 ; VAE 880 ; TSY 100 ; VBM 000 ; Passive und aktive Kontinentalränder {Geologie} ; Arktis {Geophysik} ; Geologische Interpretation geophysikalischer Beobachtungen
    Sprache: Englisch
    Materialart: monograph , publishedVersion
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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