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  • 2000-2004  (7)
  • 1995-1999  (6)
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Year
  • 1
    Article
    Article
    Vulkaninseln als ozeanische Geosysteme (1997)
    Associated volumes
    Details Availability
    In: Geowissenschaften, Berlin : Ernst & Sohn, 1988, 15(1997), 9, Seite 301-305, 0933-0704
    In: volume:15
    In: year:1997
    In: number:9
    In: pages:301-305
    Type of Medium: Article
    Pages: Ill., Kt.
    ISSN: 0933-0704
    Language: German
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    GEOMAR CATALOGUE
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  • 2
    Online Resource
    Online Resource
    Growth processes and destructive events during the evolution of volcanic islands : a case study from the Canary Islands (1999)
    Kiel
    Details Availability
    Keywords: Dissertation ; Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource ( 134Seiten = 22MB) , Ill., graph. Darst., Kt
    URL: https://oceanrep.geomar.de/id/eprint/48277/
    Language: English
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  • 3
    Electronic Resource
    Electronic Resource
    Reflection Seismic Investigations In the Volcaniclastic Apron of Gran Canaria and Implications For Its Volcanic Evolution (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 125 (1996), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: High-resolution reflection seismic data obtained around Gran Canaria allow a detailed and consistent correlation of seismic reflectors of the northern and southern Canary Basins with the lithology drilled by DSDP Leg 47A SSE of Gran Canaria, as well as with major phases of volcanic activity on Gran Canaria as mapped onshore. Two prominent reflectors were chosen as marker horizons and correlated with the drilled lithology. the results indicate that reflector R7 above the Miocene volcaniclastic debris flows V1-V3 reflects the shield-building phase of Gran Canaria. Reflector R3 is interpreted as corresponding with the Pliocene Roque Nublo formation.The top of the massive island flank of Gran Canaria, defined by seismically chaotic facies, extends 44 to 72 km off the coast of Gran Canaria. West of Gran Canaria the flank of Tenerife onlaps the steeper and older flank of Gran Canaria, which, in turn, is onlapping the older flank of Fuerteventura to the east in a similar way.Erosional channels, which can also be traced up to 50 km from the area between Gran Canaria and Fuerteventura into the deeper northern basin, have been identified in the bathymetry.The data presented provide new detailed information for modelling the submarine and subaerial evolution of the central Canary Islands of Gran Canaria and Tenerife, i.e. the timing of their shield-building phases and later stages of major volcanic activity, as reflected by the position of prominent seismic reflectors in the seismic stratigraphy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1996.tb00015.x
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    Paper (German National Licenses)
    Fulltext
  • 4
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    Vulkaninseln als ozeanische Geosysteme (1997)
    Ernst & Sohn
    In:  Geowissenschaften, 15 (9). pp. 301-305.
    Details
    Publication Date: 2020-02-13
    Description: The structural, temporal, compositional and volcanic evolution of oceanic intraplate islands is one of the major research areas in our department. A regional focus is on the island groups and seamounts along the passive margin off Northwest Africa. The Canary Islands which are characterized by an unususally large compositional spectrum of igneous rocks and long magmatic histories, exceeding 20 Ma in some islands, are the main target area for our ongoing combined on- and offshore studies. We here report on specific events and stages in the structural and chemical evolution of the island of Gran Canaria and its sedimentary apron using a variety of methods. Detailed studies of constructive and destructive processes during island evolution have allowed to predict - and verify by deep sea drilling - the submarine and subaerial evolution of Gran Canaria and its surrounding sedimentary basins. Our aim is to develop a globally representative model explaining the evolution of volcanic islands including aspects of volcanic hazards related to explosive eruptions and tsunamis triggered by island flank collapses.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Reflection Seismic Investigations In the Volcaniclastic Apron of Gran Canaria and Implications For Its Volcanic Evolution (1996)
    Wiley
    In:  Geophysical Journal International, 125 (2). pp. 519-536.
    Details
    Publication Date: 2017-11-07
    Description: High-resolution reflection seismic data obtained around Gran Canaria allow a detailed and consistent correlation of seismic reflectors of the northern and southern Canary Basins with the lithology drilled by DSDP Leg 47A SSE of Gran Canaria, as well as with major phases of volcanic activity on Gran Canaria as mapped onshore. Two prominent reflectors were chosen as marker horizons and correlated with the drilled lithology. the results indicate that reflector R7 above the Miocene volcaniclastic debris flows V1-V3 reflects the shield-building phase of Gran Canaria. Reflector R3 is interpreted as corresponding with the Pliocene Roque Nublo formation. The top of the massive island flank of Gran Canaria, defined by seismically chaotic facies, extends 44 to 72 km off the coast of Gran Canaria. West of Gran Canaria the flank of Tenerife onlaps the steeper and older flank of Gran Canaria, which, in turn, is onlapping the older flank of Fuerteventura to the east in a similar way. Erosional channels, which can also be traced up to 50 km from the area between Gran Canaria and Fuerteventura into the deeper northern basin, have been identified in the bathymetry. The data presented provide new detailed information for modelling the submarine and subaerial evolution of the central Canary Islands of Gran Canaria and Tenerife, i.e. the timing of their shield-building phases and later stages of major volcanic activity, as reflected by the position of prominent seismic reflectors in the seismic stratigraphy.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/j.1365-246X.1996.tb00015.x
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Growth processes and destructive events during the evolution of volcanic islands: a case study from the Canary Islands (1999)
    In:  (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, 133 pp
    Details
    Publication Date: 2020-01-28
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
  • 7
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    The channel between Gran Canaria and Tenerife: constructive processes and destructive events during the evolution of volcanic islands (2002)
    Springer
    In:  International Journal of Earth Sciences, 91 (4). pp. 629-641.
    Details
    Publication Date: 2018-05-30
    Description: Seismic, sidescan sonar, bathymetric multibeam and ODP (Ocean Drilling Program) data obtained in the submarine channel between the volcanic islands of Gran Canaria and Tenerife allow to identify constructive features and destructive events during the evolution of both islands. The most prominent constructive features are the submarine island flanks being the acoustic basement of the seismic images. The build-up of Tenerife started following the submarine stage of Gran Canaria because the submarine island flank of Tenerife onlaps the steeper flank of Gran Canaria. The overlying sediments in the channel between Gran Canaria and Tenerife are chaotic, consisting of slumps, debris flow deposits, syn-ignimbrite turbidites, ash layers, and other volcaniclastic rocks generated by eruptions, erosion, and flank collapse of the volcanoes. Volcanic cones on the submarine island flanks reflect ongoing submarine volcanic activity. The construction of the islands is interrupted by large destructive events, especially by flank collapses resulting in giant landslides. Several Miocene flank collapses (e.g., the formation of the Horgazales basin) were identified by combining seismic and drilling data whereas young giant landslides (e.g., the Güimar debris avalanche) are documented by sidescan, bathymetric and drilling data. Sediments are also transported through numerous submarine canyons from the islands into the volcaniclastic apron. Seismic profiles across the channel do not show a major offset of reflectors. The existence of a repeatedly postulated major NE–SW-trending fault zone between Gran Canaria and Tenerife is thus in doubt. The sporadic earthquake activity in this area may be related to the regional stress field or the submarine volcanic activity in this area. Seismic reflectors cannot be correlated through the channel between the sedimentary basins north and south of Gran Canaria because the channel acts as sediment barrier. The sedimentary basins to the north and south evolved differently following the submarine growth of Gran Canaria and Tenerife in the Miocene.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00531-002-0285-8
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    Crustal structure of northern Gran Canaria, Canary Islands, deduced from active seismic tomography (2002)
    Elsevier
    In:  Journal of Volcanology and Geothermal Research, 115 (1-2). pp. 153-177.
    Details
    Publication Date: 2017-07-20
    Description: Seismic P-wave travel times collected during METEOR cruise M24 are inverted to derive a three-dimensional model of the P-wave velocity structure of the northern part of Gran Canaria, Canary Islands. The data consist of 6689 P-wave travel times from 1487 offshore air-gun shots which were recorded by both land-based seismometers and ocean bottom hydrophones. The crustal structure is well imaged by the data set as demonstrated by analysis of the resolution and tests with synthetic data. The volcanic island is characterized by generally high P-wave velocities (〉5.5 km/s) and a heterogeneous structure with large lateral velocity variations. High P-wave velocities are found around the centers of the Miocene shield volcanoes in the vicinity of Agüimes, San Nicolas, and Agaete as well as the center of the Pliocene Roque Nublo volcano. The velocity structure suggests a high percentage of dense intrusive rocks. Some of the intrusive rocks were emplaced during the eruption of 〉1000 km3 of Miocene felsic magmas following the basaltic shield phase. The velocity structure beneath La Isleta peninsula and its submarine continuation is interpreted as a volcanic rift zone with abundant dikes. The velocities decrease to 〈5 km/s north of the coastline. A high velocity zone thinning away from the central edifice is interpreted as the massive island flank extending up to 50 km off the coast which is underlain by prevolcanic Neogene–Jurassic sediments. The igneous part of the oceanic crust exhibits an anomalous structure with a relatively small thickness (∼3 km) layer 3 and a 2–4-km-thick layer 2, probably reflecting a modification of the crust due to long-lasting magmatic intrusive activity during the evolution of the Canary Islands. The Moho north of Gran Canaria is found at a depth of ∼15 km. The structure of Gran Canaria and the adjacent ocean basin is thought to be the result of a diffuse mantle upwelling under a slowly moving plate.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0377-0273(01)00313-4
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Submarine landslides around the Canary Islands (2001)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Solid Earth, 106 (B3). pp. 3977-3997.
    Details
    Publication Date: 2019-04-08
    Description: The morphology and structure of the submarine flanks of the Canary Islands were mapped using the GLORIA long-range side-scan sonar system, bathymetric multibeam systems, and sediment echosounders. Twelve young (〈2 Ma) giant landslides have been identified on the submarine flanks of the Canary Islands up to now. Older landslide events are long buried under a thick sediment cover due to high sedimentation rates around the Canary Islands. Most slides were found on the flanks of the youngest and most active islands of La Palma, El Hierro, and Tenerife, but young giant landslides were also identified on the flanks of the older (15–20 Ma) but still active eastern islands. Large-scale mass wasting is an important process during all periods of major magmatic activity. The long-lived volcanic constructive history of the islands of the Canary Archipelago is balanced by a correspondingly long history of destruction, resulting in a higher landslide frequency for the Canary Islands compared to the Hawaiian Islands, where giant landslides only occur late in the period of active shield growth. The lower stability of the flanks of the Canaries is probably due to the much steeper slopes of the islands, a result of the abundance of highly evolved intrusive and extrusive rocks. Another reason for the enhanced slope instability is the abundance of pyroclastic deposits on Canary Islands resulting from frequent explosive eruptions due to the elevated volatile contents in the highly alkalic magmas. Dike-induced rifting is most likely the main trigger mechanism for destabilization of the flanks. Flank collapses are a major geological hazard for the Canary Islands due to the sector collapses themselves as well as triggering of tsunamis. In at least one case, a giant lateral blast occurred when an active magmatic or hydrothermal system became unroofed during flank collapse.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2000JB900413
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 10
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    Large-scale slides on the flanks of the Canary Islands (2002)
    Springer
    In:  In: European Margin Sediment Dynamics: Side-scan Sonar and Seismic Images. , ed. by Mienert, J. and Weaver, P. Springer, Berlin, pp. 293-296. ISBN 3-540-42393-1
    Details
    Publication Date: 2020-04-03
    Description: The Canary Archipelago, located off the West African continental margin, is one of the largest oceanic island groups in the ocean basins (Fig. 1). A general but slightly diffuse westward age progression of the shield phases of the islands was interpreted as evidence for a hot spot origin of the Canary Islands (Wilson 1973; Schmincke 1982; Carracedo et al. 1998). During the last 15 years, morphological studies of the submarine flanks of ocean islands with swath bathymetry, sidescan sonar and high-resolution seismic systems have demonstrated that giant submarine landslides play an important role during the evolut ion of volcanic islands. Landslides on ocean islands are one of the most important transport processes of volcaniclastic material into the volcanic apron. They are a major geological hazard due to the sector collapses themselves as weil as triggering of tsunamis.
    Type: Book chapter , NonPeerReviewed
    Format: text
    DOI: 10.1007/978-3-642-55846-7_49
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    OceanRep: Book chapter
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