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  • Springer  (2)
  • IMarEST  (1)
  • Inter Research  (1)
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  • 1
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    Active mud volcanoes on the upper slope of the western Nile deep-sea fan - first results from the P362/2 cruise of R/V Poseidon (2010)
    Springer
    In:  Geo-Marine Letters, 30 (3/4). pp. 169-186.
    Details
    Publication Date: 2017-05-19
    Description: In February 2008, cruise P362/2 was undertaken aboard R/V Poseidon to the Giza and North Alex mud volcanoes (MVs) on the upper slope of the western Nile deep-sea fan. Emitted fluids were strongly depleted in chloride and rich in hydrocarbons, predominantly of thermogenic origin. In-situ sediment temperature measurements indicate extremely high and moderate levels of activity for the North Alex MV and Giza MV, respectively, and suggest rapid changes from dormant to active stages. Both the physical properties of core sediments (e.g., color and magnetic susceptibility), and their assemblages of micro- and nannofossils point to different sources for the two mud volcanoes. Biostratigraphic dating suggests source depths of 2,100–2,450 mbsf for the Giza MV and 1,150–1,550 mbsf for the North Alex MV. Very high temperatures of up to 70°C in shallow sediments at the North Alex MV can be explained only if the fluid source were warmer and deeper than the sediment source.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1007/s00367-010-0192-0
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Investigating the impact of sub-seabed CO2 storage on marine ecosystems (2012)
    IMarEST
    In:  The Marine Scientist, 40 . pp. 18-21.
    Details
    Publication Date: 2016-05-24
    Description: As the world faces the consequences of rising anthropogenic carbon dioxide entering the atmosphere and ultimately the ocean, a growing arsenal of adaptation and mitigation strategies are being investigated. Carbon dioxide capture and storage (CCS) is regarded as a useful way of removing CO2 at source, transporting it and storing it at depth underground, in saline aquifers or depleted hydrocarbon reservoirs beneath the seabed. But will there be any impacts in the marine environment above these sites? Anja Reitz describes how one EC- funded project hopes to find the answers.
    Type: Article , NonPeerReviewed , info:eu-repo/semantics/article
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
  • 3
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    Seabed methane emissions and the habitat of frenulate tubeworms on the Captain Arutyunov mud volcano (Gulf of Cadiz) (2009)
    Inter Research
    In:  Marine Ecology Progress Series, 382 . pp. 69-86.
    Details
    Publication Date: 2018-06-01
    Description: Submarine mud volcanism represents an important. pathway for methane from deeper reservoirs to the surface, where it enters the benthic carbon cycle. To quantify overall methane release from the Captain Arutyunov mud volcano (CAMV) and to assess the contribution of macrobenthic seep organisms to the regulation of the benthic methane flux, we linked water column methane concentrations, seabed methane emission and pore water geochemistry to the spatial distribution of seep biota. Prominent organisms of the CAMV seep biota were 3 different species of frenulate tubeworms. Seabed methane emission ranged from 0.001 to 0.66 mmol m(-2) d(-1). Dense patches of tubeworms were associated with the lowest seabed methane emission. Elevated methane emission was associated with a sporadic distribution of tubeworms and the occurrence of numerous mud clasts. Despite the presence of a large subsurface methane reservoir, the estimated total methane release from CAMV was low (0.006 x 10(6) mol yr(-1)). In addition to direct methane consumption by Siboglinum poseidoni, the tubeworms likely contribute to the retention of methane carbon in the sediment by affecting bacterial communities in the proximity of the tubes. The siboglinids create new meso-scale habitats on the sediment Surface, increasing habitat heterogeneity and introducing niches for bacterial communities.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3354/meps07956
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Authigenic carbonate precipitates from the NE Black Sea: a mineralogical, geochemical, and lipid biomarker study (2009)
    Springer
    In:  International Journal of Earth Sciences, 98 (3). pp. 677-695.
    Details
    Publication Date: 2017-05-18
    Description: Carbonate precipitates recovered from 2,000 m water depth at the Dolgovskoy Mound (Shatsky Ridge, north eastern Black Sea) were studied using mineralogical, geochemical and lipid biomarker analyses. The carbonates differ in shape from simple pavements to cavernous structures with thick microbial mats attached to their lower side and within cavities. Low δ13C values measured on carbonates (−41 to −32‰ V-PDB) and extracted lipid biomarkers indicate that anaerobic oxidation of methane (AOM) played a crucial role in precipitating these carbonates. The internal structure of the carbonates is dominated by finely laminated coccolith ooze and homogeneous clay layers, both cemented by micritic high-magnesium calcite (HMC), and pure, botryoidal, yellowish low-magnesium calcite (LMC) grown in direct contact to microbial mats. δ18O measurements suggest that the authigenic HMC precipitated in equilibrium with the Black Sea bottom water while the yellowish LMC rims have been growing in slightly 18O-depleted interstitial water. Although precipitated under significantly different environmental conditions, especially with respect to methane availability, all analysed carbonate samples show lipid patterns that are typical for ANME-1 dominated AOM consortia, in the case of the HMC samples with significant contributions of allochthonous components of marine and terrestrial origin, reflecting the hemipelagic nature of the primary sediment.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00531-007-0264-1
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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