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  • 365; 472; Center for Marine Environmental Sciences; GC; GeoB13809-1; GeoB13849-1; Gravity corer; M78/3A; M78/3B; MARUM; Meteor (1986)  (1)
  • 397; 498; Center for Marine Environmental Sciences; GC; GeoB13820-1; GeoB13863-1; Gravity corer; M78/3A; M78/3B; MARUM; Meteor (1986)  (1)
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  • 1
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    Unknown
    Geochemistry of sediment cores GeoB13820-1 and GeoB13863-1 from the western South Atlantic (2014)
    PANGAEA
    In:  Supplement to: Riedinger, Natascha; Formolo, Michael J; Lyons, Timothy W; Henkel, Susann; Beck, Antje; Kasten, Sabine (2014): An inorganic geochemical argument for coupled anaerobic oxidation of methane and iron reduction in marine sediments. Geobiology, 12(2), 172-181, https://doi.org/10.1111/gbi.12077
    Details
    Publication Date: 2024-02-02
    Description: Here, we present results from sediments collected in the Argentine Basin, a non-steady state depositional marine system characterized by abundant oxidized iron within methane-rich layers due to sediment reworking followed by rapid deposition. Our comprehensive inorganic data set shows that iron reduction in these sulfate and sulfide-depleted sediments is best explained by a microbially mediated process-implicating anaerobic oxidation of methane coupled to iron reduction (Fe-AOM) as the most likely major mechanism. Although important in many modern marine environments, iron-driven AOM may not consume similar amounts of methane compared with sulfate-dependent AOM. Nevertheless, it may have broad impact on the deep biosphere and dominate both iron and methane cycling in sulfate-lean marine settings. Fe-AOM might have been particularly relevant in the Archean ocean, 〉2.5 billion years ago, known for its production and accumulation of iron oxides (in iron formations) in a biosphere likely replete with methane but low in sulfate. Methane at that time was a critical greenhouse gas capable of sustaining a habitable climate under relatively low solar luminosity, and relationships to iron cycling may have impacted if not dominated methane loss from the biosphere.
    Keywords: 397; 498; Center for Marine Environmental Sciences; GC; GeoB13820-1; GeoB13863-1; Gravity corer; M78/3A; M78/3B; MARUM; Meteor (1986)
    Type: Dataset
    Format: application/zip, 8 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
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    Sulfate and methane concentrations measured in pore water of sediment core GeoB13809-1 and GeoB13849-1 (2012)
    PANGAEA
    In:  Supplement to: Henkel, Susann; Schwenk, Tilmann; Hanebuth, Till J J; Strasser, Michael; Riedinger, Natascha; Formolo, Michael J; Arnold, Gail Lee; Tomasini, Juan; Krastel, Sebastian; Kasten, Sabine (2012): Pore water geochemistry as a tool for identifying and dating young mass-transport deposits. In: Yamada, Y et al. (eds.) Advances in Natural and Technological Hazards Research - Submarine Mass Movements and Their Consequences, 5th International Symposium, Springer, 31(1), 87-97, https://doi.org/10.1007/978-94-007-2162-3_8
    Details
    Publication Date: 2024-02-02
    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 profiles evidentially indicate transient pore water conditions generated by submarine landslides. After mass-movements that result in the deposition of sediment packages with distinct pore water signatures, the sulfate 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. Sulfate 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.
    Keywords: 365; 472; Center for Marine Environmental Sciences; GC; GeoB13809-1; GeoB13849-1; Gravity corer; M78/3A; M78/3B; MARUM; Meteor (1986)
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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