Replication Data for: Spatial changes in gas transport and sediment stiffness influenced by regional stress: observations from piezometer data along Vestnesa Ridge, eastern Fram Strait

• Main Authors: Plaza-Faverola, Andreia, Sultan, Nabil
• Format: Other/Unknown Material
• Language: English
• Published: DataverseNO 2023
• Subjects: Earth and Environmental Sciences; Piezometer; pore-fluid pressures; fluid flow; gas hydrates; calypso cores; Vestnesa Ridge; Fram Strait; Arctic; Bergen; Norway; Tromsø; Magnetic susceptibility; Arctic University of Norway; UiT The Arctic University of Norway
• Online Access: https://doi.org/10.18710/GUX2O8

This database comprises piezometer pore-pressure and temperature data, analyses from Calypso sediment cores (grain sizes and logs) and results from geotechnical tests (index tests and oedometer tests), used for the study of seepage systems along the Vestnesa Ridge, in the eastern Fram Strait. The data were collected over 2 research expeditions to the area. The reports for each of the expeditions can be accessed via Septentrio (https://septentrio.uit.no/index.php/cage): - CAGE20-6 cruise report (https://doi.org/10.7557/cage.6918) -CAGE19-3 cruise report (https://doi.org/10.7557/cage.6911) In-situ pore fluid pressure (P) and temperature (T) were measured using the Ifremer piezometer which consists of a cable-deployed tool equipped with a sediment lance of 60 mm diameter carrying differential pore pressure (i.e., pore pressures in excess of hydrostatic pressures or excess pore pressure) and temperature sensors ( e.g., In situ equilibrium pore-water pressures derived from partial piezoprobe dissipation tests in marine sediments, Canadian Geotechnical Journal, 50(12), 1294-1305). Calypso cores were taken for correlation with piezometer data using the Calypso Giant Piston Corer operated by the Norwegian Institute for Marine research and the University of Bergen. Density, P-wave velocity and magnetic susceptibility (MS) logs on the unsplit sections were registered using the multi sensor core logger (MSCL) at UiT – The Arctic University of Norway in Tromsø. The upper 9 m of the calypso cores were subsampled in 1-cm thick slices at 10 cm intervals in cores C-4 and C-12. Core C-5 was subsampled every 20 cm, except between 4 to 5 m depth where the sampling was performed every 10 cm. The textural characteristics of the sediments were determined through wet sieving at 63 µm to separate the mud fraction (clay and silt) from the fractions coarser than 63 microns (sand, grains and pebbles). Oedometer tests with constant rate of strain (CRS) were conducted at whole-around sub-samples from 2 depth intervals along each core at the ...