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[1] 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 (...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.667.5520 http://www.gvc.gu.se/digitalAssets/1316/1316578_stranne-et-al2009.pdf |
| Summary: | [1] 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 whichmay 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. Citation: Stranne, C., R. A. Sohn, B. Liljebladh, and K. Nakamura (2010), Analysis and modeling of hydrothermal plume data acquired from the 85°E segment of the Gakkel Ridge, J. Geophys. Res., 115, C06028, doi:10.1029/2009JC005776. |
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