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  • Wiley  (16)
  • Kiel : GEOMAR Forschungszentrum für Marine Geowissenschaften an der Christian-Albrechts-Universität zu Kiel  (3)
  • IFM-Geomar, Kiel  (2)
  • 1
    Online Resource
    Online Resource
    PACOMAR 3 : Geowissenschaftliche Untersuchungen in pazifischen Seegebieten vor Costa Rica und Nicaragua ; ein Beitrag zum Verständnis eines aktiven Kontinentalrandes ; Abschlußbericht, Berichtszeitraum: 1. Dezember 1995 bis 31. Dezember 1998 (1999)
    Kiel : GEOMAR Forschungszentrum für Marine Geowissenschaften an der Christian-Albrechts-Universität zu Kiel
    Details Availability
    Keywords: Forschungsbericht
    Description / Table of Contents: Margin, seismics, Galapagos hotspot track, mantle plumes, geochemistry, volcanology, Nicaragua, Costa Rica
    Type of Medium: Online Resource
    Pages: 15 p. = 82 kB, text
    Edition: [Electronic ed.]
    URL: https://edocs.tib.eu/files/e001/253026709.pdf
    URL: https://edocs.tib.eu/files/e001/253026709l.pdf
    Language: German , English
    Note: nIndex , Contract no. BMBF 03G0107A , Differences between the printed and electronic version of the document are possible. - Attachments not included
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  • 2
    Online Resource
    Online Resource
    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 Availability
    Keywords: Forschungsbericht
    Description / Table of Contents: Continental margins, seismic, ocean bottom seismometers, seismicity, accretion, Makran, Murray Ridge, Pakistan
    Type of Medium: Online Resource
    Pages: 25 p. = 85,9 Kb., text
    Edition: [Elektronische Ressource]
    URL: https://edocs.tib.eu/files/e001/314108882.pdf
    Language: German , English
    Note: Contract BMBF 03G00123A , Differences between the printed and electronic version of the document are possible
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    GEOMAR CATALOGUE
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  • 3
    Online Resource
    Online Resource
    ORWELL : Oregon and Washington exploration of the lithosphere - a geophysical experiment : SONNE Fahrt SO108 ; Abschlußbericht ; Berichtszeitraum: 1. März 1996 bis 30. November 1998 (1999)
    Kiel : GEOMAR Forschungszentrum für Marine Geowissenschaften an der Christian-Albrechts-Universität zu Kiel
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: 17 p. = 56,4 Kb., text
    Edition: [Electronic ed.]
    URL: https://edocs.tib.eu/files/e001/270277196.pdf
    URL: https://edocs.tib.eu/files/e001/270277196l.pdf
    Language: German
    Note: nIndex. - Contract BMBF 03G00108A , Differences between the printed and electronic version of the document are possible
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  • 4
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    FS Sonne Fahrtbericht/Cruise Report SO 190 (2010)
    IFM-Geomar, Kiel
    Details
    Publication Date: 2021-03-29
    Description: report
    Keywords: 551.4 ; 551.22 ; 550
    Language: English
    Type: article , publishedVersion
    Format: 193 S.
    Format: application/pdf
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    CITATION GEO-LEO
  • 5
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    FS Sonne Fahrtbericht/Cruise Report SO 186 Leg 3 (2010)
    IFM-Geomar, Kiel
    Details
    Publication Date: 2021-03-29
    Description: report
    Keywords: 551.4 ; 551.22 ; 550 ; UKD 100 ; TSZ 200 ; TSJ 200 ; TOH 300 ; TOH 100 ; TOH 200 ; TQC 600 ; Expeditionsberichte {Regionale Ozeanologie, Indischer Ozean} ; Indischer Ozean {Geophysik} ; Südostasien {Geophysik} ; Seismische Wellen {Geophysik} ; Seismometrie {Geophysik} ; Seismische Vorhersagen {Geophysik} ; Tiefseeseismik {Geophysik}
    Language: English
    Type: article , publishedVersion
    Format: 212 S.
    Format: application/pdf
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    CITATION GEO-LEO
  • 6
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    Crustal structure of the central Sunda margin at the onset of oblique subduction (2001)
    Wiley
    In:  Geophysical Journal International, 147 (2). pp. 449-474.
    Details
    Publication Date: 2018-07-16
    Description: The convergent margin of the central Sunda Arc in Indonesia was the target of a reflection and refraction seismic survey conducted in 1998 and 1999. Along two seismic lines across the subduction complex off southern Sumatra and off Sunda Strait, coincident multichannel and wide-angle data were collected, complemented by two refraction strike-lines in the forearc basin off Sumatra. The combined analysis of the acquired data allows us to present a detailed model of the subduction zone where initiation of strain partitioning occurs due to the onset of oblique subduction. The dip of the subducted plate is well defined along both dip-lines and a lateral increase from 5° to 7° from beneath the outer high off Sumatra to Sunda Strait is supported by complementary gravity modelling. The downgoing slab is traced to a depth of more than 30km. On both reflection dip-lines, a clearly developed backstop structure underlying a trench slope break defines the landward termination of the active accretionary prism and separates it from the outer high. Active subduction accretion is supported by laterally increasing velocities between the deformation front and the active backstop structure. Seismic velocities of the outer high are moderate along both lines (〈5.8kms−1 at 20km depth), suggesting a sedimentary composition. Reduced reflectivity beneath a rugged top basement traced along the outer high of both dip-lines supports a high degree of deformation and material compaction. Several kilometres of sediment has accumulated in the forearc domain, although a distinct morphological basin is only recognized off southern Sumatra and is not developed off Sunda Strait. The bathymetric elevation of the Java shelf that is encountered in the southern Sunda Strait corresponds to increased velocities of a basement high there and is connected to extensional structures of the Sunda Strait transtensional basin. Differences observed in the morphology of the forearc domain are also reflected in the lower crustal structure. Off southern Sumatra, the velocity–depth model clearly indicates a continental-type crust underlying the forearc basin, whereas lower velocities are found beneath the Sunda Strait forearc domain. Off Sumatra, some 3-D constraint on the upper plate structure is gained from the refraction strike-lines, which in addition is supported by synthetic data modelling.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1046/j.0956-540x.2001.01547.x
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Lower slope morphology of the Sumatra trench system (2008)
    Wiley
    In:  Basin Research, 20 (4). pp. 519-529.
    Details
    Publication Date: 2019-01-21
    Description: At convergent margins, the structure of the subducting oceanic plate is one of the key factors controlling the morphology of the upper plate. We use high-resolution seafloor mapping and multichannel seismic reflection data along the accretionary Sumatra trench system to investigate the morphotectonic response of the upper plate to the subduction of lower plate fabric. Upper plate segmentation is reflected in varying modes of mass transfer. The deformation front in the southern Enggano segment is characterized by neotectonic formation of a broad and shallow fold-and-thrust belt consistent with the resumption of frontal sediment accretion in the wake of oceanic relief subduction. Conversely, surface erosion increasingly shapes the morphology of the lower slope and accretionary prism towards the north where significant oceanic relief is subducted. Subduction of the Investigator Fracture Zone and the fossil Wharton spreading centre in the Siberut segment exemplifies this. Such features also correlate with an irregularly trending deformation front suggesting active frontal erosion of the upper plate. Lower plate fabric extensively modulates upper plate morphology and the large-scale morphotectonic segmentation of the Sumatra trench system is linked to the subduction of reactivated fracture zones and aseismic ridges of the Wharton Basin. In general, increasing intensity of mass-wasting processes, from south to north, correlates with the extent of oversteepening of the lower slope (lower slope angle of 3.8 degrees in the south compared with 7.6 degrees in the north), probably in response to alternating phases of frontal accretion and sediment underthrusting. Accretionary mechanics thus pose a second-order factor in shaping upper plate morphology near the trench.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/j.1365-2117.2008.00381.x
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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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
    Publication Date: 2018-01-31
    Description: 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.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1046/j.1365-246x.2000.00154.x
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  • 9
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    Crustal architecture and deep structure of the Ninetyeast Ridge hotspot trail from active-source ocean bottom seismology (2001)
    Wiley
    In:  Geophysical Journal International, 144 (2). pp. 414-431.
    Details
    Publication Date: 2018-01-31
    Description: A 550-km-long transect across the Ninetyeast Ridge, a major Indian ocean hotspot trail, provided seismic refraction and wide-angle reflection data recorded on 60 ocean bottom instruments. About 24 000 crustal and 15 000 upper mantle arrivals have been picked and used to derive an image of the hotspot track. Two approaches have been chosen: (i) a first-arrival tomographic inversion yielding crustal properties; and (ii) forward modelling of mantle phases revealing the structure at the crust–mantle boundary region and of the uppermost mantle. Away from the volcanic edifice, seismic recordings show the typical phases from oceanic crust, that is, two crustal refraction branches (Pg), a wide-angle reflection from the crust–mantle boundary (PmP) and a wave group turning within the upper mantle (Pn). Approaching the edifice, three additional phases have been detected. We interpret these arrivals as a wide-angle reflection from the base of material trapped under the pre-hotspot crust (Pm2P) and as a wide-angle reflection (PnP) and its associated refraction branch (PN) from a layered upper mantle. The resulting models indicate normal oceanic crust to the west and east of the edifice. Crustal thickness averages 6.5–7 km. Wide-angle reflections from both the pre-hotspot and the post-hotspot crust–mantle boundary suggest that the crust under the ridge has been bent downwards by loading the lithosphere, and hotspot volcanism has underplated the pre-existing crust with material characterized by seismic velocities intermediate between those of mafic lower crustal and ultramafic upper mantle rocks (7.5–7.6 km s−1). In total, the crust is up to ≈ 24 km thick. The ratio between the volume of subcrustal plutonism forming the underplate and extrusive and intrusive volcanism forming the edifice is about 0.7. An important observation is that underplating continued to the east under the Wharton Basin. During the shield-building phase, however, Ninetyeast Ridge was located adjacent to the Broken Ridge and was subsequently pulled apart along a transform fault boundary. Therefore, underplating eastwards of the fracture zone separating the edifice from the Wharton Basin suggests that prolonged crustal growth by subcrustal plutonism occurred over millions of years after the major shield-building stage. This fact, however, requires mantle flow along the fossil hotspot trail. The occurrence of PnP and PN arrivals is probably associated with a layered and anisotropic upper mantle due to the preferential alignment of olivine crystals and may have formed by rising plume material which spread away under the base of the lithosphere.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1046/j.0956-540X.2000.01334.x
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  • 10
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    Three-dimensional seismic refraction tomography of the crustal structure at the ION site on the Ninetyeast Ridge, Indian Ocean (2003)
    Wiley
    In:  Geophysical Journal International, 152 (1). pp. 171-184.
    Details
    Publication Date: 2018-07-17
    Description: We have performed a 3-D seismic refraction tomography of a 48 × 48 km2 area surrounding ODP site 757, which is planned to host an International Ocean Network (ION) permanent seismological observatory, called the Ninetyeast Ridge Observatory (NERO). The study area is located in the southern part of the Ninetyeast Ridge, the trail left by the Kerguelen hotspot on the Indian plate. The GEOMAR Research Centre for Marine Geosciences and the Federal Institute for Geosciences and Natural Resources acquired 18 wide-angle profiles recorded by 23 ocean bottom hydrophones during cruise SO131 of R/V Sonne in spring 1998. We apply a first arrival traveltime tomography technique using regularized inversion to recover the 3-D velocity structure relative to a 1-D background model that was constructed from a priori information and averaged traveltime data. The final velocity model revealed the crustal structure down to approximately 8 km depth. Resolution tests showed that structures with approximately 6 km horizontal extent can reliably be resolved down to that depth. The survey imaged the extrusive layer of the upper crust of the Ninetyeast Ridge, which varies in thickness between 3 and 4 km. A high-velocity anomaly coinciding with a positive magnetic anomaly represents a volcanic centre from which crust in this area is thought to have formed. A pronounced low-velocity anomaly is located underneath a thick sedimentary cover in a bathymetric depression. However, poor ray coverage of the uppermost kilometre of the crust in this area resulted in smearing of the shallow structure to a larger depth. Tests explicitly including the shallow low-velocity layer confirmed the existence of the deeper structure. The heterogeneity of the upper crust as observed by our study will have consequences for the waveforms of earthquake signals to be recorded by the future seismic observatory.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1046/j.1365-246X.2003.01838.x
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