Analysis and modeling of hydrothermal plume data acquired from the 85°E segment of the Gakkel Ridge
Sohn, Robert A.
MetadataShow full item record
We use data from a CTD plume-mapping campaign conducted during the Arctic Gakkel Vents (AGAVE) expedition in 2007 to constrain the nature of hydrothermal processes on the Gakkel Ridge at 85°E. Thermal and redox potential (Eh) anomalies were detected in two discrete depth intervals: 2400–2800 m (Interval 1) and 3000–3800 m (Interval 2). The spatial and temporal patterns of the signals indicate that the Interval 1 anomalies were most likely generated by a single large, high-temperature (T > 100°C) vent field located on the fault terraces that form the NE axial valley wall. In contrast, the Interval 2 anomalies appear to have been generated by up to 7 spatially distinct vent fields associated with constructional volcanic features on the floor of the axial valley, many of which may be sites of diffuse, low-temperature (T < 10°C) discharge. Numerical simulations of turbulent plumes rising in a weakly stratified Arctic Ocean water column indicate that the high-temperature field on the axial valley wall has a thermal power of ∼1.8 GW, similar to the Trans-Atlantic Geotraverse and Rainbow fields in the Atlantic Ocean, whereas the sites on the axial valley floor have values ranging from 5 to 110 MW.
Author Posting. © American Geophysical Union, 2010. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 115 (2010): C06028, doi:10.1029/2009JC005776.
Suggested CitationArticle: Stranne, Christian, Sohn, Robert A., Liljebladh, Bengt, Nakamura, Ko-ichi, "Analysis and modeling of hydrothermal plume data acquired from the 85°E segment of the Gakkel Ridge", Journal of Geophysical Research 115 (2010): C06028, DOI:10.1029/2009JC005776, https://hdl.handle.net/1912/3894
Showing items related by title, author, creator and subject.
Hydrothermal venting in magma deserts : the ultraslow-spreading Gakkel and Southwest Indian Ridges Baker, Edward T.; Edmonds, Henrietta N.; Michael, Peter J.; Bach, Wolfgang; Dick, Henry J. B.; Snow, Jonathan E.; Walker, Sharon L.; Banerjee, Neil R.; Langmuir, Charles H. (American Geophysical Union, 2004-08-18)Detailed hydrothermal surveys over ridges with spreading rates of 50–150 mm/yr have found a linear relation between spreading rate and the spatial frequency of hydrothermal venting, but the validity of this relation at ...
Scaling for turbulent viscosity of buoyant plumes in stratified fluids : PIV measurement with implications for submarine hydrothermal plume turbulence Zhang, Wei; He, Zhiguo; Jiang, Houshuo (2017-10-07)Time-resolved particle image velocimetry (PIV) has been used to measure instantaneous twodimensional velocity vector fields of laboratory-generated turbulent buoyant plumes in linearly stratified saltwater over extended ...
Lupton, John E.; Pyle, Douglas G.; Jenkins, William J.; Greene, Ronald; Evans, Leigh (American Geophysical Union, 2004-01-17)Several hydrographic stations in the vicinity of the Samoa Islands have 3He/4He above the regional background in the depth range of 1500–1800 m, indicating injection of mantle helium from a local hydrothermal source. The ...