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Radiographs of the gravity core HE443/10-3 from North Sea

Radiographs of gravity core HE443/10-3 that was collected in the Helgoland mud area. The radiographs were produced about 8 months after coring and sampling. The white spots derive from previous sediment sampling that was performed onboard through windows that were cut into the core liner. The core shows intervals with intact sedimentary structures, but also intervals that are strongly mixed by bioturbation.

Pore-water and solid-phase data of a multicorer core and a gravity core at Station HE443/10, North Sea

This is a compilation of pore-water and solid-phase data for station HE443/10 in the Helgoland mud area (German Bight, North Sea). The data derive from a multicorer core (HE443/10-2) and a gravity core (HE443/10-3) which were collected during a RV HEINCKE Expedition in 2015 in order to study iron reduction processes that are linked to methane formation and oxidation. Solid-phase geochemical data includes the bulk elemental composition or the sediment as well as sequential extraction data including reactive iron oxides and sulfides. Furthermore, the stable iron isotope composition of dissolved iron and in sequentially extracted Fe pools has been determined.

Solid phase geochemistry of a multicorer core and a gravity core at Station HE443/10, North Sea

Solid-phase samples were collected onboard (RV Heincke expedition HE443) using cut-off syringes. The MUC was sliced and sampled. For sampling the GC, small windows were drilled into the liner through which the syringes were introduced. All samples were stored anoxically and frozen at -20°C until processing. The processing involved freeze-drying and grinding before splitting the samples for the different kinds of analyses.

Pore-water data of a multicorer core and a gravity core at Station HE443/10, North Sea

Pore water was collected onboard (RV Heincke expedition HE443) by use of rhizons that were inserted into the cores through drilled holes in the core liners. Samples were preserved and analyses were performed onshore (at AWI) shortly after the expedition.

Solid phase iron isotopic composition of a gravity core at Station HE443/10, North Sea

Solid-phase samples were collected onboard (RV Heincke expedition HE443) using cut-off syringes. The MUC was sliced and sampled. For sampling the GC, small windows were drilled into the liner through which the syringes were introduced. All samples were stored anoxically and frozen at -20°C until processing. The processing involved freeze-drying and grinding. Extracts deriving from the sequential extraction of Fe phases were processed for stable Fe isotope analysis after Henkel et al. (2016).

Pore-water iron isotopes data of a multicorer core and a gravity core at Station HE443/10, North Sea

Pore water for iron isotope analysis was collected by use of rhizons, acidified and stored at 4°C until processing onshore. Processing of pore water (purification and matching) was performed at the University of Cologne, and measurements were performed on a MC-ICPMS at the Steinmann Institute in Bonn.

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