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  • 2000-2004  (4)
  • 2000  (4)
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  • 2000-2004  (4)
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  • 1
    Online-Ressource
    Online-Ressource
    MAMUT : Makran-Murray Traverse - Geophysik plattentektonischer Extremfälle ; Sonne Fahrt SO 123 ; Abschlußbericht ; Berichtszeitraum: 1. Juli 1997 bis 31. Dezember 1999 (2000)
    Kiel : GEOMAR Forschungszentrum für Marine Geowissenschaften an der Christian-Albrechts-Universität zu Kiel
    Details Verfügbarkeit
    Schlagwort(e): Forschungsbericht
    Beschreibung / Inhaltsverzeichnis: Continental margins, seismic, ocean bottom seismometers, seismicity, accretion, Makran, Murray Ridge, Pakistan
    Materialart: Online-Ressource
    Seiten: 25 p. = 85,9 Kb., text
    Ausgabe: [Elektronische Ressource]
    URL: https://edocs.tib.eu/files/e001/314108882.pdf
    Sprache: Deutsch , Englisch
    Anmerkung: Contract BMBF 03G00123A , Differences between the printed and electronic version of the document are possible
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
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    Crustal underplating and its implications for subsidence and state of isostasy along the Ninetyeast Ridge hotspot trail (2000)
    Wiley
    In:  Geophysical Journal International, 142 (2). pp. 643-649.
    Details
    Publikationsdatum: 2018-01-31
    Beschreibung: Recent seismic field work has revealed high lower-crustal velocities under Ninetyeast Ridge, Indian Ocean, indicating the presence of crustal underplating (Grevemeyer et al. 2000). We used results from Ocean Drilling Program (ODP) drill cores and cross-spectral analysis of gravity and bathymetric data to study the impact of the underplating body on the subsidence history and the mode of isostatic compensation along Ninetyeast Ridge. Compared with the adjacent Indian basin, the subsidence of Ninetyeast Ridge is profoundly anomalous. Within the first few millions of years after crustal emplacement the ridge subsided rapidly. Thereafter, however, subsidence slowed down significantly. The most reliable model of isostasy suggests loading of a thin elastic plate on and beneath the seafloor. Isostatic compensation of subsurface loading occurs at a depth of about 25km, which is in reasonably good agreement with seismic constraints. Subsurface loading is inherently associated with buoyant forces acting on the lithosphere. The low subsidence may therefore be the superposition of cooling of the lithosphere and uplift due to buoyant material added at the base of the crust. A model including prolonged crustal growth in the form of subcrustal plutonism may account for all observations.
    Materialart: Article , PeerReviewed
    Format: text
    DOI: 10.1046/j.1365-246x.2000.00154.x
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
  • 3
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    The continental margin off Oregon from seismic investigations (2000)
    Elsevier
    In:  Tectonophysics, 329 (1-4). pp. 79-97.
    Details
    Publikationsdatum: 2018-01-05
    Beschreibung: In April and May 1996, a geophysical study of the Cascadia continental margin off Oregon and Washington was carried out aboard the German RV Sonne as a cooperative experiment between GEOMAR, the USGS and COAS. Offshore central Oregon, which is the subject of this study, the experiment involved the collection of wide-angle refraction and reflection data along three profiles across the continental margin using ocean-bottom seismometers (OBS) and hydrophones (OBH) as well as land recorders. Two-dimensional modelling of the travel times provides a detailed velocity structure beneath these profiles. The subducting oceanic crust of the Juan de Fuca plate can be traced from the trench to its position some 10 km landward of the coastline. At the coastline, the Moho has a depth of 30 km. The dip of the plate changes from 1.5° westward of the trench to about 6.5° below the accretionary complex and to about 16° further eastward below the coast. The backstop forming western edge of the Siletz terrane, an oceanic plateau that was accreted to North America about 50 Ma ago, is well defined by the observations. It is located about 60 km to the east of the deformation front and has a seaward dip of 40°. At its seaward edge, the base of the Siletz terrane seems to be in contact with the subducting oceanic crust implying that sediments are unlikely to be subducted to greater depths. The upper oceanic crust is thinner to the east of this contact than to the west. At depths greater than 18 km, the top of the oceanic crust is the origin of pre-critical reflections observable in several land recordings and in the data of one ocean bottom instrument. These reflections are most likely caused by fluids that are released from the oceanic crust by metamorphic facies transition.
    Materialart: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0040-1951(00)00190-6
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
  • 4
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    Unbekannt
    The Costa Rican Pacific margin: from accretion to erosion (2000)
    Schweizerbart
    In:  Zentralblatt für Geologie und Paläontologie / Teil 1, 1999 (7-8). pp. 669-678.
    Details
    Publikationsdatum: 2019-01-21
    Beschreibung: The understanding of the tectonic processes shaping the Pacific margin off Costa Rica has undergone a dramatic evolution during the past 25 years. The margin, initially interpreted to be built by accretion of sediment from the ocean plate, is now interpreted as made of ophiolitic rocks that are exposed onshore, with no net accretion currently active. New seismic images indicate that upper plate tectonic erosion might be the dominant process. Erosion is accomplished in some cases through transport of large bodies from upper to lower plate by plate boundary readjustment. Subduction of seamounts locally accelerates tectonic erosion.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
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