Fluid compositions and mineralogy of precipitates from Mid Atlantic Ridge hydrothermal vents at 4°48'S
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2009
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| author | Haase, Karsten M Petersen, Sven Koschinsky, Andrea Seifert, Richard Devey, Colin W Keir, Robin Lackschewitz, Klas Sven Melchert, Bernd Perner, Kerstin Schmale, Oliver Süling, J Dubilier, Nicole Zielinski, Frank Fretzdorff, Susanne Garbe-Schönberg, Dieter Westernstroer, Ulrike German, Christopher R Shank, Timothy M Yoerger, Dana Giere, Olav Küver, Jan Marbler, Herwig Mawick, Jule Mertens, Christian Stöber, Uwe Walter, Maren Ostertag-Henning, Christian Paulick, Holger Peters, Michael Strauss, Harald Sander, Sylvia Stecher, Jens Warmuth, Marco Weber, Stefan |
| author_facet | Haase, Karsten M Petersen, Sven Koschinsky, Andrea Seifert, Richard Devey, Colin W Keir, Robin Lackschewitz, Klas Sven Melchert, Bernd Perner, Kerstin Schmale, Oliver Süling, J Dubilier, Nicole Zielinski, Frank Fretzdorff, Susanne Garbe-Schönberg, Dieter Westernstroer, Ulrike German, Christopher R Shank, Timothy M Yoerger, Dana Giere, Olav Küver, Jan Marbler, Herwig Mawick, Jule Mertens, Christian Stöber, Uwe Walter, Maren Ostertag-Henning, Christian Paulick, Holger Peters, Michael Strauss, Harald Sander, Sylvia Stecher, Jens Warmuth, Marco Weber, Stefan |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The effect of volcanic activity on submarine hydrothermal systems has been well documented along fast- and intermediate-spreading centers but not from slow-spreading ridges. Indeed, volcanic eruptions are expected to be rare on slow-spreading axes. Here we report the presence of hydrothermal venting associated with extremely fresh lava flows at an elevated, apparently magmatically robust segment center on the slow-spreading southern Mid-Atlantic Ridge near 5°S. Three high-temperature vent fields have been recognized so far over a strike length of less than 2 km with two fields venting phase-separated, vapor-type fluids. Exit temperatures at one of the fields reach up to 407°C, at conditions of the critical point of seawater, the highest temperatures ever recorded from the seafloor. Fluid and vent field characteristics show a large variability between the vent fields, a variation that is not expected within such a limited area. We conclude from mineralogical investigations of hydrothermal precipitates that vent-fluid compositions have evolved recently from relatively oxidizing to more reducing conditions, a shift that could also be related to renewed magmatic activity in the area. Current high exit temperatures, reducing conditions, low silica contents, and high hydrogen contents in the fluids of two vent sites are consistent with a shallow magmatic source, probably related to a young volcanic eruption event nearby, in which basaltic magma is actively crystallizing. This is the first reported evidence for direct magmatic-hydrothermal interaction on a slow-spreading mid-ocean ridge. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_727454 |
| institution | PANGAEA |
| language | en |
| publishDate | 2009 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Fluid compositions and mineralogy of precipitates from Mid Atlantic Ridge hydrothermal vents at 4°48'S Haase, Karsten M Petersen, Sven Koschinsky, Andrea Seifert, Richard Devey, Colin W Keir, Robin Lackschewitz, Klas Sven Melchert, Bernd Perner, Kerstin Schmale, Oliver Süling, J Dubilier, Nicole Zielinski, Frank Fretzdorff, Susanne Garbe-Schönberg, Dieter Westernstroer, Ulrike German, Christopher R Shank, Timothy M Yoerger, Dana Giere, Olav Küver, Jan Marbler, Herwig Mawick, Jule Mertens, Christian Stöber, Uwe Walter, Maren Ostertag-Henning, Christian Paulick, Holger Peters, Michael Strauss, Harald Sander, Sylvia Stecher, Jens Warmuth, Marco Weber, Stefan DERIDGE; From Mantle to Ocean: Energy-, Material- and Life-cycles at Spreading Axes; M64/1; M64/1-114-ROV; M64/1-123-ROV; M64/1-124-GTV; M64/1-125-ROV; M64/1-130-ROV; M64/1-139-GTV; M64/1-141-ROV; M64/1-146-ROV; M68/1; M68/1-03-ROV; M68/1-07-ROV; M68/1-12-ROV; M68/1-20-ROV; MARSUED2; MARSUED3; Mephisto; Meteor (1986); Mid-Atlantic Ridge at 4-11°S; MULT; Multiple investigations; Remote operated vehicle; ROV; Shrimp_Farm; Sister_Peak; Tannenbaum; Television-Grab; TVG; Two_Boats The effect of volcanic activity on submarine hydrothermal systems has been well documented along fast- and intermediate-spreading centers but not from slow-spreading ridges. Indeed, volcanic eruptions are expected to be rare on slow-spreading axes. Here we report the presence of hydrothermal venting associated with extremely fresh lava flows at an elevated, apparently magmatically robust segment center on the slow-spreading southern Mid-Atlantic Ridge near 5°S. Three high-temperature vent fields have been recognized so far over a strike length of less than 2 km with two fields venting phase-separated, vapor-type fluids. Exit temperatures at one of the fields reach up to 407°C, at conditions of the critical point of seawater, the highest temperatures ever recorded from the seafloor. Fluid and vent field characteristics show a large variability between the vent fields, a variation that is not expected within such a limited area. We conclude from mineralogical investigations of hydrothermal precipitates that vent-fluid compositions have evolved recently from relatively oxidizing to more reducing conditions, a shift that could also be related to renewed magmatic activity in the area. Current high exit temperatures, reducing conditions, low silica contents, and high hydrogen contents in the fluids of two vent sites are consistent with a shallow magmatic source, probably related to a young volcanic eruption event nearby, in which basaltic magma is actively crystallizing. This is the first reported evidence for direct magmatic-hydrothermal interaction on a slow-spreading mid-ocean ridge. |
| title | Fluid compositions and mineralogy of precipitates from Mid Atlantic Ridge hydrothermal vents at 4°48'S |
| topic | DERIDGE; From Mantle to Ocean: Energy-, Material- and Life-cycles at Spreading Axes; M64/1; M64/1-114-ROV; M64/1-123-ROV; M64/1-124-GTV; M64/1-125-ROV; M64/1-130-ROV; M64/1-139-GTV; M64/1-141-ROV; M64/1-146-ROV; M68/1; M68/1-03-ROV; M68/1-07-ROV; M68/1-12-ROV; M68/1-20-ROV; MARSUED2; MARSUED3; Mephisto; Meteor (1986); Mid-Atlantic Ridge at 4-11°S; MULT; Multiple investigations; Remote operated vehicle; ROV; Shrimp_Farm; Sister_Peak; Tannenbaum; Television-Grab; TVG; Two_Boats |
| url | https://doi.org/10.1594/PANGAEA.727454 |