Blar i forfatter "Borrelli, Chiara"

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    • Benthic Foraminifera in Arctic Methane Hydrate Bearing Sediments 

      Dessandier, Pierre-Antoine; Borrelli, Chiara; Kalenitchenko, Dimitri; Panieri, Giuliana (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-12-10)
      Benthic foraminifera have been widely used as proxy for paleo-methane emissions, mainly based on their stable isotopic signature. In cold seeps, the ecology of these organisms remains uncertain, in particular their ability to thrive during active phases of seepage. In this study, we evaluate the benthic foraminiferal response to methane seepage in Arctic sediments. We do so by examining living and ...

    • The benthic foraminiferal δ34S records fux and timing of paleo methane emissions 

      Borrelli, Chiara; Gabitov, R.I.; Liu, M.-C.; Hertwig, A.T.; Panieri, Giuliana (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-28)
      In modern environments, pore water geochemistry and modelling simulations allow the study of methane (CH<sub>4</sub>) sources and sinks at any geographic location. However, reconstructing CH<sub>4</sub> dynamics in geological records is challenging. Here, we show that the benthic foraminiferal δ<sup>34</sup>S can be used to reconstruct the fux (i.e., difusive vs. advective) and timing of CH<sub>4</sub> ...

    • Biogeochemical investigations of methane seepage at the ultraslow-spreading Arctic mid-ocean ridge: Svyatogor ridge, Fram Strait 

      Argentino, Claudio; Borrelli, Chiara; Akinselure, Abidemi; Correa-Diaz, Melyssa; Panieri, Giuliana (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-02-13)
      The Arctic continental shelves are important reservoirs of methane stored in gas hydrates and deeper geological formations. However, little is known about methane dynamics in deeper oceanic settings such as mid-ocean ridges, mainly due to operational challenges related to their remoteness. This study investigates a recently discovered methane seepage environment at Svyatogor Ridge, a sediment-covered ...

    • Characterization of Carbonate Crust from a Recently Discovered Methane Seep on the North Atlantic Continental Margin of the USA 

      Gabitov, Rinat; Borrelli, Chiara; Buettner, Jacob; Kirkland, Brenda; Skarke, Adam; Trail, Dustin; Garner, Brittany; Testa, Maurice; Wahidi, Mahnaz; Hoff, Christopher; Khasanov, Salavat; Panieri, Giuliana; Thirumalai, Roobanvenkatesh; Thomas, Jay; Weremeichik, Jeremy; Zverkova, Irina (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-02-26)
      This study is focused on mineralogical and chemical characterization of an authigenic carbonate rock (crust) collected at a recently discovered cold seep on the US North Atlantic continental margin. X-ray diffraction (XRD) and scanning electron microscopy (SEM) indicate that the carbonate rock is composed of microcrystalline aragonite cement, white acicular aragonite crystals (AcAr), equant quartz ...

    • Foraminiferal δ18O reveals gas hydrate dissociation in Arctic and North Atlantic ocean sediments 

      Dessandier, Pierre-Antoine; Borrelli, Chiara; Yao, Haoyi; Sauer, Simone; Hong, Wei-Li; Panieri, Giuliana (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-07)
      Paleoceanographic investigations in the Arctic and north Atlantic are crucial to understanding past and current climate change, in particular considering amounts of pressure-temperature sensitive gas stored in marine sediments of the region. Many paleoceanographic studies are based on foraminiferal oxygen and carbon stable isotope compositions (δ<sup>18</sup>O, δ<sup>13</sup>C) from either planktonic ...

    • Novel biomineralization strategy in calcareous foraminifera 

      Borrelli, Chiara; Panieri, Giuliana; Dahl, Trine Merete; Neufeld, Kai (Journal article; Tidsskriftartikkel; Peer reviewed, 2018)
      This work shows that calcareous benthic foraminifera are capable of agglutinating sedimentary particles also. In particular, we focus on Melonis barleeanus. Traditionally considered a calcareous species, our data revealed the presence of minute (~3 μm) sedimentary particles (silicate grains) inside the chamber walls of the examined shells. These particles were arranged in a definitive and systematic ...