Data gridded with a minimum curvature algorithm, and shown with linear color scales shaded from the NE and overlain by bathymetric contour lines of 0.5-m spacing; white line section of Fig. 4. a Bathymetry (CTD pressure data) and EM profile lines (blue); b bottom-water electrical conductivity measured using the profiler's external CTD; c mud layer thickness and d sand reflector depth, both determined from 10-kHz sub-bottom profiles; e apparent electrical conductivity and f apparent magnetic susceptibility, calculated from the 4.8-kHz quadrature and 75-Hz in-phase EM signals, respectively. g, h Deep-towed passive Overhauser magnetometry and surface sample maps of the survey area. g Magnetization of the subsurface related to a virtual layer of 10-m thickness; h magnetic susceptibility of 146 surface grab samples (yellow crosses). Orange circles 17 sample locations for detailed rock magnetic and geochemical investigations, black dots gravity core locations K1 to K8 (note that K6 is located NE of K1, outside the map area). Maps produced with Oasis montaj from GEOSOFT. See http://www.geosoft.com for viewer software. See doi:10.1594/PANGAEA.761536 for raw data.