Fig. 1: Location and geological setting of the Jøtul hydrothermal field.
From: High H2 production in sediment-hosted hydrothermal fluids at an ultraslow spreading mid-ocean ridge
a Overview of the Norwegian-Greenland Sea (Esri GEBCO basemap) with main ridge segments (red lines, dashed line: inactive) and transform faults (black lines). AR Aegir Ridge, JMFZ Jan Mayen Fracture Zone, JMR Jan Mayen Ridge, LT Lena Trough, KnR Knipovich Ridge, KoR Kolbeinsey Ridge, MhR Mohns Ridge, MR Molloy Ridge, MFZ Molloy Fracture Zone, SFZ Spitsbergen Fracture Zone. b Location of Jøtul hydrothermal field at the eastern flank of the rift valley close to the Brøgger AVR (Axial Volcanic Ridge). Ship-based multibeam bathymetry aquired during cruise MSM10946. Dashed white and black lines mark the boundaries of the rift valley floor and the Brøgger AVR, respectively. c High-resolution (AUV-derived46) bathymetry map of the fluid sampling sites in the Jøtul hydrothermal field (red stars), seafloor observations (white dots, S3a-S3d) and soapstone sample (black dot, GeoB20526-2). Maps in this figure were created using ArcGIS® software by Esri. d Conceptual schematic profile of the tectonic, lithological and hydrothermal framework below the Jøtul hydrothermal field. The sampled vents are enumerated as following: (1) Nidhogg and (2) Yggdrasil, (3) Fenris, and (4) Gyme. The black dot shows the location of soapstone GeoB25026-2 (metasomatized peridotite, c.f. c Given slopes represent averaged seafloor slopes measured from the bottom of the rift valley floor to the vent site (5°) and from the vent site to near the ridge crest in the east (13°).
