Image_5_Geochemistry of Hydrothermal Fluids From the E2-Segment of the East Scotia Ridge: Magmatic Input, Reaction Zone Processes, Fluid Mixing Regimes and Bioenergetic Landscapes.jpeg
The compositions of hydrothermal fluids in back-arc basins (BABs) can be affected by the influx of magmatic fluids into systems that are dominated by reactions between basement rocks and seawater-derived fluids. The East Scotia Ridge (ESR) in the Scotia Sea hosts such hydrothermal systems where the...
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2022
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Online Access: | https://doi.org/10.3389/fmars.2022.765648.s006 https://figshare.com/articles/figure/Image_5_Geochemistry_of_Hydrothermal_Fluids_From_the_E2-Segment_of_the_East_Scotia_Ridge_Magmatic_Input_Reaction_Zone_Processes_Fluid_Mixing_Regimes_and_Bioenergetic_Landscapes_jpeg/20071283 |
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ftfrontimediafig:oai:figshare.com:article/20071283 2023-05-15T18:16:01+02:00 Image_5_Geochemistry of Hydrothermal Fluids From the E2-Segment of the East Scotia Ridge: Magmatic Input, Reaction Zone Processes, Fluid Mixing Regimes and Bioenergetic Landscapes.jpeg Samuel I. Pereira Alexander Diehl Jill M. McDermott Thomas Pape Lukas Klose Harald Strauss Gerhard Bohrmann Wolfgang Bach 2022-06-15T05:16:39Z https://doi.org/10.3389/fmars.2022.765648.s006 https://figshare.com/articles/figure/Image_5_Geochemistry_of_Hydrothermal_Fluids_From_the_E2-Segment_of_the_East_Scotia_Ridge_Magmatic_Input_Reaction_Zone_Processes_Fluid_Mixing_Regimes_and_Bioenergetic_Landscapes_jpeg/20071283 unknown doi:10.3389/fmars.2022.765648.s006 https://figshare.com/articles/figure/Image_5_Geochemistry_of_Hydrothermal_Fluids_From_the_E2-Segment_of_the_East_Scotia_Ridge_Magmatic_Input_Reaction_Zone_Processes_Fluid_Mixing_Regimes_and_Bioenergetic_Landscapes_jpeg/20071283 CC BY 4.0 CC-BY Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering hydrothermal vents East Scotia Ridge back-arc basin conductive cooling magmatic water bioenergetics Southern Ocean Image Figure 2022 ftfrontimediafig https://doi.org/10.3389/fmars.2022.765648.s006 2022-06-15T23:03:52Z The compositions of hydrothermal fluids in back-arc basins (BABs) can be affected by the influx of magmatic fluids into systems that are dominated by reactions between basement rocks and seawater-derived fluids. The East Scotia Ridge (ESR) in the Scotia Sea hosts such hydrothermal systems where the role of magmatic fluid influx has not yet been addressed. During expedition PS119 in 2019, three chimneys were sampled from the E2 segment. These samples were analysed for their chemical and isotopic composition along with fluid inclusions in corresponding precipitates. Our data provide evidence for the temporal evolution of hydrothermal fluids in this remote back-arc system. Salinity variations in anhydrite-hosted fluid inclusions indicate that phase separation takes place in the subseafloor. Moderate-temperature (<53°C) fluids from the newly discovered E2-West hydrothermal vent field and high-temperature (>320°C) fluids from the E2-South area were sampled. Depletions in fluid-mobile elements, ΣREE and low δ 18 O H2O show that the basement in this root zone has been leached since the previous sampling in 2010. The results indicate that high-temperature fluid-rock interactions are key in setting the composition of the fluids with cation-to-chloride ratios suggesting a common root zone for both vent sites. The concentrations of dissolved gases provide new insights in the connection between magmatic degassing and its influence on endmember vent fluid composition. Specifically, stable isotope (O, H) data and elevated CO 2 concentrations point to a minor influx of magmatic vapour. Stable sulphur isotopes provide no evidence for SO 2 disproportionation suggesting a H 2 O-CO 2 dominated nature of these vapours. The concentrations of conservative elements in the E2-W fluid reflects subseafloor mixing between E2-S endmember fluid and seawater. In contrast, non-conservative behaviour, and depletion of Fe, H 2 , and H 2 S point to a combination of sub-surface abiotic and biotic reactions affecting these fluids. Similarly, ... Still Image Scotia Sea Southern Ocean Frontiers: Figshare East Scotia Ridge ENVELOPE(-29.250,-29.250,-57.917,-57.917) Scotia Sea Southern Ocean |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering hydrothermal vents East Scotia Ridge back-arc basin conductive cooling magmatic water bioenergetics Southern Ocean |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering hydrothermal vents East Scotia Ridge back-arc basin conductive cooling magmatic water bioenergetics Southern Ocean Samuel I. Pereira Alexander Diehl Jill M. McDermott Thomas Pape Lukas Klose Harald Strauss Gerhard Bohrmann Wolfgang Bach Image_5_Geochemistry of Hydrothermal Fluids From the E2-Segment of the East Scotia Ridge: Magmatic Input, Reaction Zone Processes, Fluid Mixing Regimes and Bioenergetic Landscapes.jpeg |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering hydrothermal vents East Scotia Ridge back-arc basin conductive cooling magmatic water bioenergetics Southern Ocean |
description |
The compositions of hydrothermal fluids in back-arc basins (BABs) can be affected by the influx of magmatic fluids into systems that are dominated by reactions between basement rocks and seawater-derived fluids. The East Scotia Ridge (ESR) in the Scotia Sea hosts such hydrothermal systems where the role of magmatic fluid influx has not yet been addressed. During expedition PS119 in 2019, three chimneys were sampled from the E2 segment. These samples were analysed for their chemical and isotopic composition along with fluid inclusions in corresponding precipitates. Our data provide evidence for the temporal evolution of hydrothermal fluids in this remote back-arc system. Salinity variations in anhydrite-hosted fluid inclusions indicate that phase separation takes place in the subseafloor. Moderate-temperature (<53°C) fluids from the newly discovered E2-West hydrothermal vent field and high-temperature (>320°C) fluids from the E2-South area were sampled. Depletions in fluid-mobile elements, ΣREE and low δ 18 O H2O show that the basement in this root zone has been leached since the previous sampling in 2010. The results indicate that high-temperature fluid-rock interactions are key in setting the composition of the fluids with cation-to-chloride ratios suggesting a common root zone for both vent sites. The concentrations of dissolved gases provide new insights in the connection between magmatic degassing and its influence on endmember vent fluid composition. Specifically, stable isotope (O, H) data and elevated CO 2 concentrations point to a minor influx of magmatic vapour. Stable sulphur isotopes provide no evidence for SO 2 disproportionation suggesting a H 2 O-CO 2 dominated nature of these vapours. The concentrations of conservative elements in the E2-W fluid reflects subseafloor mixing between E2-S endmember fluid and seawater. In contrast, non-conservative behaviour, and depletion of Fe, H 2 , and H 2 S point to a combination of sub-surface abiotic and biotic reactions affecting these fluids. Similarly, ... |
format |
Still Image |
author |
Samuel I. Pereira Alexander Diehl Jill M. McDermott Thomas Pape Lukas Klose Harald Strauss Gerhard Bohrmann Wolfgang Bach |
author_facet |
Samuel I. Pereira Alexander Diehl Jill M. McDermott Thomas Pape Lukas Klose Harald Strauss Gerhard Bohrmann Wolfgang Bach |
author_sort |
Samuel I. Pereira |
title |
Image_5_Geochemistry of Hydrothermal Fluids From the E2-Segment of the East Scotia Ridge: Magmatic Input, Reaction Zone Processes, Fluid Mixing Regimes and Bioenergetic Landscapes.jpeg |
title_short |
Image_5_Geochemistry of Hydrothermal Fluids From the E2-Segment of the East Scotia Ridge: Magmatic Input, Reaction Zone Processes, Fluid Mixing Regimes and Bioenergetic Landscapes.jpeg |
title_full |
Image_5_Geochemistry of Hydrothermal Fluids From the E2-Segment of the East Scotia Ridge: Magmatic Input, Reaction Zone Processes, Fluid Mixing Regimes and Bioenergetic Landscapes.jpeg |
title_fullStr |
Image_5_Geochemistry of Hydrothermal Fluids From the E2-Segment of the East Scotia Ridge: Magmatic Input, Reaction Zone Processes, Fluid Mixing Regimes and Bioenergetic Landscapes.jpeg |
title_full_unstemmed |
Image_5_Geochemistry of Hydrothermal Fluids From the E2-Segment of the East Scotia Ridge: Magmatic Input, Reaction Zone Processes, Fluid Mixing Regimes and Bioenergetic Landscapes.jpeg |
title_sort |
image_5_geochemistry of hydrothermal fluids from the e2-segment of the east scotia ridge: magmatic input, reaction zone processes, fluid mixing regimes and bioenergetic landscapes.jpeg |
publishDate |
2022 |
url |
https://doi.org/10.3389/fmars.2022.765648.s006 https://figshare.com/articles/figure/Image_5_Geochemistry_of_Hydrothermal_Fluids_From_the_E2-Segment_of_the_East_Scotia_Ridge_Magmatic_Input_Reaction_Zone_Processes_Fluid_Mixing_Regimes_and_Bioenergetic_Landscapes_jpeg/20071283 |
long_lat |
ENVELOPE(-29.250,-29.250,-57.917,-57.917) |
geographic |
East Scotia Ridge Scotia Sea Southern Ocean |
geographic_facet |
East Scotia Ridge Scotia Sea Southern Ocean |
genre |
Scotia Sea Southern Ocean |
genre_facet |
Scotia Sea Southern Ocean |
op_relation |
doi:10.3389/fmars.2022.765648.s006 https://figshare.com/articles/figure/Image_5_Geochemistry_of_Hydrothermal_Fluids_From_the_E2-Segment_of_the_East_Scotia_Ridge_Magmatic_Input_Reaction_Zone_Processes_Fluid_Mixing_Regimes_and_Bioenergetic_Landscapes_jpeg/20071283 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2022.765648.s006 |
_version_ |
1766189437419520000 |