Author:
Bohrmann Gerhard,Streuff Katharina,Römer Miriam,Knutsen Stig-Morten,Smrzka Daniel,Kleint Jan,Röhler Aaron,Pape Thomas,Sandstå Nils Rune,Kleint Charlotte,Hansen Christian,dos Santos Ferreira Christian,Walter Maren,de Paula Santos Gustavo Macedo,Bach Wolfgang
Abstract
AbstractOceanic spreading centers north of Iceland are characterized by ultraslow spreading rates, and related hydrothermal activity has been detected in the water column and at the seafloor along nearly all ridge segments. An exception is the 500-km-long Knipovich Ridge, from where, until now, no hydrothermal vents were known. Here we report the investigation of the first hydrothermal vent field of the Knipovich Ridge, which was discovered in July 2022 during expedition MSM109. The newly discovered hydrothermal field, named Jøtul hydrothermal field, is associated with the eastern bounding fault of the rift valley rather than with an axial volcanic ridge. Guided by physico-chemical anomalies in the water column, ROV investigations on the seafloor showed a wide variety of fluid escape sites, inactive and active mounds with abundant hydrothermal precipitates, and chemosynthetic organisms. Fluids with temperatures between 8 and 316 °C as well as precipitates were sampled at four vent sites. High methane, carbon dioxide, and ammonium concentrations, as well as high 87Sr/86Sr isotope ratios of the vent fluids indicate strong interaction between magma and sediments from the Svalbard continental margin. Such interactions are important for carbon mobilization at the seafloor and the carbon cycle in the ocean.
Funder
Deutsche Forschungsgemeinschaft
Universität Bremen
Publisher
Springer Science and Business Media LLC
Reference46 articles.
1. Corliss, J. B. et al. Submarine thermal springs on the Galápagos rift. Science 203, 1073–1083 (1979).
2. Spiess, F. N. et al. East pacific rise: Hot springs and geophysical experiments. Science 207, 1421–1433 (1980).
3. Karson, J. A., Kelley, D. S., Fornari, D. J., Perfit, M. R. & Shank, T. M. Discovering the Deep: A Photographic Atlas of the Seafloor and Ocean Crust https://doi.org/10.1017/CBO9781139050524 (Cambridge University Press, 2015).
4. Alt, J. C. Subseafloor Processes in mid-ocean ridge hydrothermal systems. In Seafloor Hydrothermal Systems: Physical, Chemical, Biological, and Geological Interactions (eds Humphris, S. E. et al.) 85–114 (American Geophysical Union, 1995).
5. Kelley, D. S. & Shank, T. M. Hydrothermal systems: A Decade of discovery in slow spreading environments. In Diversity of Hydrothermal Systems on Slow Spreading Ocean Ridges (eds Rona, P. A. et al.) 369–407 (American Geophysical Union, 2010).