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  • PANGAEA  (284)
  • AGU (American Geophysical Union)  (1)
  • Bremen : MARUM - Zentrum für Marine Umweltwissenschaften, Fachbereich Geowissenschaften, Universität Bremen  (1)
  • Springer Science+Business Media B.V.  (1)
Document type
Keywords
Publisher
Language
Years
  • 1
    Online Resource
    Online Resource
    Report and preliminary results of R/V SONNE cruise SO251 : extreme events archived in the geological record of Japan's subduction margins (EAGER-Japan) : Leg A SO251-1, Yokohama - Yokohama, 04.10.2016-15.10.2016, Leg B SO251-2, Yokohama - Yokohama, 18.10.2016-02.11.2016 (2017)
    Bremen : MARUM - Zentrum für Marine Umweltwissenschaften, Fachbereich Geowissenschaften, Universität Bremen
    Details Availability
    Keywords: Forschungsbericht ; Schlammvulkan
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource
    Series Statement: Berichte aus dem MARUM und dem Fachbereich Geowissenschaften der Universität Bremen No. 318
    URL: http://nbn-resolving.de/urn:nbn:de:gbv:46-00106515-12
    URN: urn:nbn:de:gbv:46-00106515-12
    DDC: 550
    Language: English
    Location Call Number Limitation Availability
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  • 2
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    An interdisciplinary investigation of a recent submarine mass transport deposit at the continental margin off Uruguay (2011)
    AGU (American Geophysical Union)
    In:  Geochemistry, Geophysics, Geosystems, 12 (8). Q08009.
    Details
    Publication Date: 2019-09-23
    Description: Assessing frequency and extent of mass movement at continental margins is crucial to evaluate risks for offshore constructions and coastal areas. A multidisciplinary approach including geophysical, sedimentological, geotechnical, and geochemical methods was applied to investigate multistage mass transport deposits (MTDs) off Uruguay, on top of which no surficial hemipelagic drape was detected based on echosounder data. Nonsteady state pore water conditions are evidenced by a distinct gradient change in the sulfate (SO42−) profile at 2.8 m depth. A sharp sedimentological contact at 2.43 m coincides with an abrupt downward increase in shear strength from ∼10 to 〉20 kPa. This boundary is interpreted as a paleosurface (and top of an older MTD) that has recently been covered by a sediment package during a younger landslide event. This youngest MTD supposedly originated from an upslope position and carried its initial pore water signature downward. The kink in the SO42− profile ∼35 cm below the sedimentological and geotechnical contact indicates that bioirrigation affected the paleosurface before deposition of the youngest MTD. Based on modeling of the diffusive re-equilibration of SO42− the age of the most recent MTD is estimated to be 〈30 years. The mass movement was possibly related to an earthquake in 1988 (∼70 km southwest of the core location). Probabilistic slope stability back analysis of general landslide structures in the study area reveals that slope failure initiation requires additional ground accelerations. Therefore, we consider the earthquake as a reasonable trigger if additional weakening processes (e.g., erosion by previous retrogressive failure events or excess pore pressures) preconditioned the slope for failure. Our study reveals the necessity of multidisciplinary approaches to accurately recognize and date recent slope failures in complex settings such as the investigated area.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2011GC003669
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Pore water geochemistry as a tool for identifying and dating recent mass-transport deposits (2012)
    Springer Science+Business Media B.V.
    In:  EPIC3Advances in Natural and Technological Hazards Research 31, Submarine Mass Movements and Their Consequences, 4th edition, Y. Ogawa (ed.), Springer., Springer Science+Business Media B.V., 11 p., pp. 87-97
    Details
    Publication Date: 2015-10-21
    Description: Several previous studies have shown that submarine mass-movements can profoundly impact the shape of pore water profiles. Therefore, pore water geochemistry and diffusion models were proposed as tools for identifying and dating recent (max. several thousands of years old) mass-transport deposits (MTDs). In particular, sulfate (SO42−) profiles evidentially indicate transient pore water conditions generated by submarine landslides. After mass-movements thatresult in the deposition of sediment packages with distinct pore water signatures,the SO42− profiles can be kink-shaped and evolve into the concave and linear shape with time due to molecular diffusion. Here we present data from the RV METEOR cruise M78/3 along the continental margin off Uruguay and Argentina. SO42− profiles of 15 gravity cores are compared with the respective acoustic facies recorded by a sediment echosounder system. Our results show that in this very dynamic depositional setting, non-steady state profiles occur often, but are not exclusively associated with mass-movements. Three sites that show acoustic indications for recent MTDs are presented in detail. Where recent MTDs are identified,a geochemical transport/reaction model is used to estimate the time that has elapsed since the perturbation of the pore water system and, thus, the timing of the MTD emplacement. We conclude that geochemical analyses are a powerful complementary tool in the identification of recent MTDs and provide a simple and accurate way of dating such deposits.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
    Format: application/pdf
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    PAPER (OA)
  • 4
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    Physical/chemical properties and stable oxygen and carbon isotope records of Holocene to late Pleistocene sediments in the Gela Basin, central Mediterranean Sea (2013)
    PANGAEA
    In:  Supplement to: Kuhlmann, Jannis; Asioli, Alessandra; Strasser, Michael; Trincardi, Fabio; Huhn, Katrin (2014): Integrated Stratigraphic and Morphological Investigation of the Twin Slide Complex Offshore Southern Sicily. In: Krastel, Sebastian; Behrmann, Jan-Hinrich; Völker, David; Stipp, Michael; Berndt, Christian; Urgeles, Roger; Chaytor, Jason; Huhn, Katrin; Strasser, Michael; Harbitz, Carl Bonnevie (eds.), Submarine Mass Movements and Their Consequences, Advances in Natural and Technological Hazards Research, 37, Springer International Publishing, Cham, 583-594, https://doi.org/10.1007/978-3-319-00972-8_52
    Details
    Publication Date: 2023-03-03
    Description: The Holocene Twin Slides form the most recent of recurrent mass wasting events along the NE portion of Gela Basin within the Sicily Channel, central Mediterranean Sea. Here, we present new evidence on the morphological evolution and stratigraphic context of this coeval slide complex based on deepdrilled sediment sequences providing a 〉100 ka paleo-oceanographic record. Both Northern (NTS) and Southern Twin Slide (STS) involve two failure stages, a debris avalanche and a translational slide, but are strongly affected by distinct preconditioning factors linked to the older and buried Father Slide. Core-acoustic correlations suggest that sliding occurred along sub-horizontal weak layers reflecting abrupt physical changes in lithology or mechanical properties. Our results show further that headwall failure predominantly took place along sub-vertical normal faults, partly through reactivation of buried Father Slide headscarps.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 5 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    XRF core scanning, magnetic susceptibility and density data from the central Japan Trench (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-03
    Description: The data set compiles gamma-ray wet bulk density, magnetic susceptibility (MS), and XRF core scans of the three cores GeoB16433-1 (38° 07.843'N, 144° 00.135'E, 7,525 m water depth), GeoB16431-1 (38° 00.177'N, 143° 59.981'E, 7,542 m water depth), and GeoB16444-1 (37° 42.017'N, 143° 52.377'E, 7,529 m water depth) retrieved from the central Japan Trench during Sonne Cruise SO219A in 2012. Gamma-ray wet bulk density and MS were measured by using the Geotek multi-sensor core logger at MARUM, University of Bremen. XRF core scans (elements: Al, Si, S, K, Ca, Ti, Mn, Fe, Br, Rb, Sr, Zr) were analyzed by using the Avaatech XRF core scanner at MARUM, University of Bremen.
    Keywords: Center for Marine Environmental Sciences; density; magnetic susceptibility; MARUM; XRF CS
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 6
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    Pore water and solid phase data of two sediment cores obtained in the Makran area offshore pakistan during expedition M 74/3 in 2007 (2013)
    PANGAEA
    In:  Supplement to: Fischer, David; Mogollón, José M; Strasser, Michael; Pape, Thomas; Bohrmann, Gerhard; Fekete, Noemi; Spieß, Volkhard; Kasten, Sabine (2013): Subduction zone earthquake as potential trigger of submarine hydrocarbon seepage. Nature Geoscience, 6(8), 647-651, https://doi.org/10.1038/ngeo1886
    Details
    Publication Date: 2023-03-03
    Description: Methane, a potent greenhouse gas, is abundant in marine sediments**1, 2. Submarine seepage of methane-dominated hydrocarbons is heterogeneous in space and time, and mechanisms that can trigger episodic seep events are poorly understood**2, 3, 4. For example, critical gas pressures have been predicted to develop beneath impermeable sediments that bear gas hydrates, making them susceptible to mechanical failure and gas release**5, 6. Gas hydrates often occur in seismically active regions, but the role of earthquakes as triggers of hydrocarbon seepage through gas-hydrate-bearing sediments has been only superficially addressed**7, 8. Here we present geochemical analyses of sediment cores retrieved from the convergent margin off Pakistan. We find that a substantial increase in the upward flux of gas occurred within a few decades of a Mw 8.1 earthquake in 1945-the strongest earthquake reported for the Arabian Sea. Our seismic reflection data suggest that co-seismic shaking fractured gas-hydrate-bearing sediments, creating pathways for the free gas to migrate from a shallow reservoir within the gas hydrate stability zone into the water column. We conservatively estimate that 3.26×10**8 mol of methane have been discharged from the seep site since the earthquake. We therefore suggest that hydrocarbon seepage triggered by earthquakes needs to be considered in local and global carbon budgets at active continental margins.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 4 datasets
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    DATA PANGAEA
  • 7
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    Heavy mineral and bulk mineral compositions of cores from Kumano Basin (2014)
    PANGAEA
    In:  Supplement to: Usman, Muhammed Ojoshogu; Masago, Hideki; Winkler, Wilfried; Strasser, Michael (2014): Mid Quaternary decoupling of sediment routing in the Nankai Forearc revealed by provenance analysis of turbiditic sands. International Journal of Earth Sciences, https://doi.org/10.1007/s00531-014-1011-z
    Details
    Publication Date: 2023-02-24
    Description: Coring during Integrated Ocean Drilling Program Expeditions 315, 316, and 333 recovered turbiditic sands from the forearc Kumano Basin (Site C0002), a Quaternary slope basin (Site C0018), and uplifted trench wedge (Site C0006) along the Kumano Transect of the Nankai Trough accretionary wedge offshore of southwest Japan. The compositions of the submarine turbiditic sands here are investigated in terms of bulk and heavy mineral modal compositions to identify their provenance and dispersal mechanisms, as they may reflect changes in regional tectonics during the past ca. 1.5 Myrs. The results show a marked change in the detrital signature and heavy mineral composition in the forearc and slope basin facies around 1 Ma. This sudden change is interpreted to reflect a major change in the sand provenance, rather than heavy mineral dissolution and/or diagenetic effects, in response to changing tectonics and sedimentation patterns. In the trench-slope basin, the sands older than 1 Ma were probably eroded from the exposed Cretaceous-Tertiary accretionary complex of the Shimanto Belt and transported via the former course of the Tenryu submarine canyon system, which today enters the Nankai Trough northeast of the study area. In contrast, the high abundance of volcanic lithics and volcanic heavy mineral suites of the sands younger than 1 Ma points to a strong volcanic component of sediment derived from the Izu-Honshu collision zones and probably funnelled to this site through the Suruga Canyon. However, sands in the forearc basin show persistent presence of blue sodic amphiboles across the 1 Ma boundary, indicating continuous flux of sediments from the Kumano/Kinokawa River. This implies that the sands in the older turbidites were transported by transverse flow down the slope. The slope basin facies then switched to reflect longitudinal flow around 1 Ma, when the turbiditic sand tapped a volcanic provenance in the Izu-Honshu collision zone, while the sediments transported transversely became confined in the Kumano Basin. Therefore, the change in the depositional systems around 1 Ma is a manifestation of the decoupling of the sediment routing pattern from transverse to long-distance axial flow in response to forearc high uplift along the megasplay fault.
    Keywords: Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 8
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    Headspace-gas measurements from IODP Hole 338-C0002F (2014)
    PANGAEA
    In:  SIO7 Data Center, J-CORES Database; Ocean Drilling Program, Center for Deep Earth Exploration (JAMSTEC)
    Details
    Publication Date: 2023-06-27
    Keywords: 338-C0002F; Chikyu; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; Ethane; Ethene; Exp338; Gas chromatography - Flame Ionization Detection (GC-FID); Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Isobutane; Methane; Nankai Trough; NanTroSEIZE Plate Boundary Deep Riser 2; n-Butane; Propane; Propene; Sample comment; Sample ID; Sample volume; Time Stamp
    Type: Dataset
    Format: text/tab-separated-values, 546 data points
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    DATA PANGAEA
  • 9
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    Miscellaneous material from IODP Hole 338-C0002F (2014)
    PANGAEA
    In:  SIO7 Data Center, J-CORES Database; Ocean Drilling Program, Center for Deep Earth Exploration (JAMSTEC)
    Details
    Publication Date: 2023-06-27
    Keywords: 338-C0002F; Chikyu; Comment; Comment 2 (continued); Comment 3 (continued); Depth, bottom/max; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Exp338; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Material; Nankai Trough; NanTroSEIZE Plate Boundary Deep Riser 2; Sample method; Sample repository
    Type: Dataset
    Format: text/tab-separated-values, 1960 data points
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    DATA PANGAEA
  • 10
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    CNS-analysis from IODP Hole 338-C0002F (2014)
    PANGAEA
    In:  SIO7 Data Center, J-CORES Database; Ocean Drilling Program, Center for Deep Earth Exploration (JAMSTEC)
    Details
    Publication Date: 2023-06-27
    Keywords: 338-C0002F; Carbon; Carbon, inorganic, total; Chikyu; Comment; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; Exp338; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Nankai Trough; NanTroSEIZE Plate Boundary Deep Riser 2; Nitrogen, total; Sample volume; Time Stamp
    Type: Dataset
    Format: text/tab-separated-values, 2866 data points
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    DATA PANGAEA
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