Geochemical characterization of hydrothermal plume fluids from the Gakkel Ridge, Arctic Ocean ...
Hydrothermal circulation and venting is an important parameter in the study of biogeochemical cycles in the world's oceans. Since hydrothermal vents were first discovered in 1977, it has been shown that they occur at every mid-ocean ridge studied. The Arctic Mid-Ocean Ridge Expedition in 2001 f...
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| Format: | Thesis |
| Language: | English |
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The University of Texas at Austin
2008
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| Online Access: | https://dx.doi.org/10.26153/tsw/54668 https://repositories.lib.utexas.edu/handle/2152/128132 |
| Summary: | Hydrothermal circulation and venting is an important parameter in the study of biogeochemical cycles in the world's oceans. Since hydrothermal vents were first discovered in 1977, it has been shown that they occur at every mid-ocean ridge studied. The Arctic Mid-Ocean Ridge Expedition in 2001 found the first evidence for venting along the Gakkel Ridge, the slowest spreading mid-ocean ridge. The Arctic Gakkel Vents Expedition in 2007 was a follow-up study to locate the vents at two distinct sites in geologically diverse regions of the ridge. Geochemical analyses of plume fluids were used to localize and characterize the hydrothermal input at each site. At Site 1 (85°N, 7°E), the plume was located between 2700-2850 m of water depth, about 1 km off the seafloor. The ³He/heat ratio associated with this plume was relatively low at 0.48 x 10⁻¹⁷ mol J⁻¹, with relatively high total dissolvable manganese (TDMn)/³He ratio of 9.6 x 10⁷ mol mol⁻¹. These ratios indicate that the Site 1 plume originates in a mature ... |
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