Cristin-resultat-ID: 2135472
Sist endret: 20. mars 2023, 16:49
Resultat
Vitenskapelig foredrag
2023

Biogeochemistry and timing of methane-derived carbonate formation at Leirdjupet fault complex, SW Barents Sea

Bidragsytere:
  • Claudio Argentino
  • Amicia Lee
  • Luca Fallati
  • Diana Sahy
  • Daniel Birgel
  • Jörn Peckmann
  • mfl.

Presentasjon

Navn på arrangementet: EGU General Assembly 2023
Sted: Vienna, Austria
Dato fra: 23. april 2023
Dato til: 28. april 2023

Om resultatet

Vitenskapelig foredrag
Publiseringsår: 2023

Beskrivelse Beskrivelse

Tittel

Biogeochemistry and timing of methane-derived carbonate formation at Leirdjupet fault complex, SW Barents Sea

Sammendrag

The origin of modern seafloor methane emissions in the Barents Sea is tightly connected to the glacio-tectonic and oceanographic transformations following the last ice age. Despite the increasing number of new active seep discoveries, their accurate geochronology and paleo-dynamic is still poorly resolved, thus hindering precise identification of triggering factors and mechanisms controlling past and future seafloor emissions. Here, we report the distribution, petrographic (thin section, electron backscatter diffraction), isotopic (δ13C, δ18O) and lipid biomarker composition of methane-derived carbonates collected from Leirdjupet Fault Complex, SW Barents Sea, at 300 m depth during an ROV survey in 2021. The integration of phase-specific isotopic analysis and U/Th dating enabled us to track carbonate mineral precipitation over the last 8 ka. Our results indicate that methane and petroleum seepage in this area followed a similar evolution as in other southernmost Barents Sea sites controlled by the asynchronous deglaciation of the Barents Sea shelf, and that methane-derived carbonate precipitation is still an active process at many Arctic locations.

Bidragsytere

Claudio Argentino

  • Tilknyttet:
    Forfatter
    ved Centre for Arctic Gas Hydrate, Environment and Climate ved UiT Norges arktiske universitet

Amicia Lee

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap ved UiT Norges arktiske universitet

Luca Fallati

  • Tilknyttet:
    Forfatter
    ved Università degli Studi di Milano-Bicocca

Diana Sahy

  • Tilknyttet:
    Forfatter
    ved British Geological Survey

Daniel Birgel

  • Tilknyttet:
    Forfatter
    ved Universität Hamburg
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