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Greg Cocks @GregCocks@techhub.social

New Hydrothermal Field In The Arctic Has Intense Geological Activity
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https://www.earth.com/news/knipovich-ridge-new-hydrothermal-field-arctic-intense-geological-activity/ <-- shared technical article
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https://doi.org/10.1038/s41598-024-60802-3 <-- shared paper
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#GIS #spatial #mapping #hydrothermal #KnipovichRidge #arctic #geology #Svalbard #Norway #arctic #ArcticOcean #marine #life #biodiversity #ecosystem #minerals #geochemistry #climatechange #methane #co2 #magma #tectonics #blacksmokers #metals #JøtulField #Jøtul #greehousegas #chemosynthesis

photo - underwater - Thriving at a depth of 3,000 meters near the Jotul Vent Field s hydrothermal vents, this Hairy decapod shrimp hosts bacteria colonies forming hairs that convert toxic hydrogen sulfide into energy, mirroring a process similar to photosynthesis.

maps - (A) Map of the Norwegian-Greenland Sea (GEBCO data) with locations of active seafloor spreading centers and the study area. (B) Detailed map of the study area (ship-based multibeam data acquired during cruise MSM109) including the Brøgger Axial Volcanic Ridge (AVR) and the newly discovered hydrothermal active area called Jøtul hydrothermal field. (C) AUV-based bathymetry of the Jøtul hydrothermal field (data acquired during cruise MSM109 and provided by the Norwegian Offshore Directorate). Track lines of ROV dives are shown and track portions, where hydrothermal activity was visually observed, are marked in yellow. Four sites were sampled for fluids during MSM109 and are indicated by circles.

thin section photos - Thin section images of precipitates from Jøtul hydrothermal field taken under reflected light. (A) Thin section part of a copper-rich domain typical for the black smoker chimney (GeoB25031-2). Chalcopyrite and ISS are tightly intergrown and co-occur with cubanite and sphalerite. Some of the FeCu-sulfide grains are covered with chalcocite (lower left corner). Anhydrite occurs in veins and as void fill. (B) Typical paragenesis of blade-like, pseudohexagonal pyrrhotite crystals with cubanite and Fe-rich sphalerite in a thin section sample of the chimney structure at Yggdrasil vent site (GeoB25034-8), location shown in Fig. 1C. Small grains of galena appear to have formed coevally with sphalerite.

photos - (A) Low-temperature vent sites associated with magmatic host rocks. Hydrothermal activity between volcanic blocks with chilled columnar joints is documented by white precipitates of mostly barite, white bacterial filaments and siboglinid tube worms. Small limpets are attached to the white surface in the front and below the rock. (B) Sediment-dusted pillow lava flow with indications of hydrothermal venting from in between the lava tubes. (C) Seafloor outcrop of mineral precipitates dominated by dolomite, partly associated with siboglinid tube worms covered with white microbial mats. (D) Sampling of hot (316 °C) fluids at the black smoker through the intake nozzle of the KIPS sampling device. The sulfide chimney, composed of chalcopyrite, sphalerite, pyrrhotite and anhydrite did not grow vertically, but leans over to the north. This can be explained by bottom-water currents deflecting the outflowing fluid from a vertical to a northerly direction. (E) Barite and amorphous silica-rich chimney at Nidhogg venting edifice, densely populated by amphipods. (F) Top-most region of Yggdrasil vent site showing multi-flanged precipitation structures and shimmering water.

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