Biogeochemistry of surface sediments in mud volcanoes of the Gulf of Cádiz
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AuthorsJiménez‑López, Dolores; Sierra, Ana; Ortega, Teodora; Manzano‑Medina, Sandra; Fernández‑Puga, M. Carmen; López-González, N. (Nieves); Vázquez, J.T. (Juan Tomás); Forja, Víctor
Gulf of Cádiz
The shallowest sediment of three mud volcanoes (MVs) located in the middle slope of the Gulf of Cádiz, Anastasya, Pipoca and St. Petersburg, have been seasonally studied during June and December 2016. These structures are locally important contributors of many biogeochemical active substances to the water column, with a special attention in the emission of methane (CH4). Along this study, the role of organic matter diagenesis and its contribution to the diffusive fluxes estimated in the sediment–water interface from the three MVs have been investigated mainly. For this, the first combined analyses of sediment properties (granulometry, porosity, density, organic carbon) and pore water chemistry (major elements, dissolved inorganic carbon (DIC), nutrients, CH4 and nitrous oxide) have been carried out. Anastasya and St. Petersburg MVs presented similar behaviours, with a slight concentration variation for the chemical variables in the top layers of the sedimentary record followed by a more ...
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