Methane seepage
Methane seepage on World Data Ocean: a running collection of 2 stories we have gathered and hand-picked because they are worth your time. Every post here touches on methane seepage in some way — the news, the analysis, the deep dives, and the occasional surprise find. A Global Hub for Ocean Intelligence 4 World Data Ocean is a centralized digital platform where researchers, scientists, and ocean enthusiasts converge to explore, analyze, and… New stories are added to this page as we find them, so check back if you want to keep up with what is happening around methane seepage, or subscribe to the RSS feed to get them as soon as they are published. Browse the collection below, or head back to the homepage to see everything World Data Ocean is covering right now.
Seafloor methane seepage under anoxic conditions in the Early Jurassic Laurasian Seaway
Early Jurassic methane seepage, documented through seep structures at Kilve and Ravenscar (U.K.), provides valuable ocean intelligence regarding past carbon cycling. This study presents a comprehensive geochemical analysis, revealing that seepage occurred under anoxic, ferruginous conditions within the Laurasian Seaway. Isotopic data and iron speciation strongly indicate sulfate-driven anaerobic oxidation of methane (SD-AOM) within sediment, partially mitigating methane flux to the water column. Variations in sulfate and methane availability likely influenced the efficiency of this natural “methane filter.”
Authigenic pyrite-magnetic susceptibility relationships influenced by methane seepage (Site U1445, Bay of Bengal)
Authigenic pyrite accumulation and magnetic susceptibility (MS) provide valuable insights into past methane seepage events within marine sediments. A recent study of 132 samples from the Bay of Bengal (Site U1445) reveals a strong link between low MS values and zones of increased pyrite content – a consequence of anaerobic oxidation of methane (AOM) and reductive dissolution of iron oxides. These findings, alongside sulfur isotope data, identify approximately eight distinct methane release events spanning a 6.2-million-year record.