Hydrothermal activity on the southern Mid-Atlantic Ridge: Tectonically- and volcanically-controlled venting at 4-5°S
German, Christopher R. ... et. al.-- 13 pages, 10 figures, supplementary data associated with this article can be found, in the online version, at https://doi.org/10.1016/j.epsl.2008.06.048
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Elsevier
2008-09-15
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| Subjects: | South Atlantic, Tectonics, Volcanism, Mid-Atlantic Ridge, Hydrothermal activity, |
| Online Access: | http://hdl.handle.net/10261/104416 |
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dig-icm-es-10261-1044162020-12-09T15:51:09Z Hydrothermal activity on the southern Mid-Atlantic Ridge: Tectonically- and volcanically-controlled venting at 4-5°S German, Christopher R. Ramírez-Llodra, Eva Nakamura, Koichi South Atlantic Tectonics Volcanism Mid-Atlantic Ridge Hydrothermal activity German, Christopher R. ... et. al.-- 13 pages, 10 figures, supplementary data associated with this article can be found, in the online version, at https://doi.org/10.1016/j.epsl.2008.06.048 We report results from an investigation of the geologic processes controlling hydrothermal activity along the previously-unstudied southern Mid-Atlantic Ridge (3-7°S). Our study employed the NOC (UK) deep-tow sidescan sonar instrument, TOBI, in concert with the WHOI (USA) autonomous underwater vehicle, ABE, to collect information concerning hydrothermal plume distributions in the water column co-registered with geologic investigations of the underlying seafloor. Two areas of high-temperature hydrothermal venting were identified. The first was situated in a non-transform discontinuity (NTD) between two adjacent second-order ridge-segments near 4°02′S, distant from any neovolcanic activity. This geologic setting is very similar to that of the ultramafic-hosted and tectonically-controlled Rainbow vent-site on the northern Mid-Atlantic Ridge. The second site was located at 4°48′S at the axial-summit centre of a second-order ridge-segment. There, high-temperature venting is hosted in an ∼ 18 km2 area of young lava flows which in some cases are observed to have flowed over and engulfed pre-existing chemosynthetic vent-fauna. In both appearance and extent, these lava flows are directly reminiscent of those emplaced in Winter 2005-06 at the East Pacific Rise, 9°50′N and reference to global seismic catalogues reveals that a swarm of large (M 4.6-5.6) seismic events was centred on the 5°S segment over a ∼ 24 h period in late June 2002, perhaps indicating the precise timing of this volcanic eruptive episode. Temperature measurements at one of the vents found directly adjacent to the fresh lava flows at 5°S MAR (Turtle Pits) have subsequently revealed vent-fluids that are actively phase separating under conditions very close to the Critical Point for seawater, at ∼ 3000 m depth and 407 °C: the hottest vent-fluids yet reported from anywhere along the global ridge crest. © 2008 Elsevier B.V. All rights reserved Funding for this work was provided by grants from NERC in the UK, from NOAA's Ocean Exploration and Vents programs in the USA, and from the Census of Marine Life program ChEss (biogeography and biodiversity of chemosynthetic ecosystems) Peer Reviewed 2014-11-06T09:51:52Z 2014-11-06T09:51:52Z 2008-09-15 2014-11-06T09:51:52Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1016/j.epsl.2008.06.048 issn: 0012-821X Earth and Planetary Science Letters 273(3-4): 332-344 (2008) http://hdl.handle.net/10261/104416 10.1016/j.epsl.2008.06.048 https://doi.org/10.1016/j.epsl.2008.06.048 none Elsevier |
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South Atlantic Tectonics Volcanism Mid-Atlantic Ridge Hydrothermal activity South Atlantic Tectonics Volcanism Mid-Atlantic Ridge Hydrothermal activity |
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South Atlantic Tectonics Volcanism Mid-Atlantic Ridge Hydrothermal activity South Atlantic Tectonics Volcanism Mid-Atlantic Ridge Hydrothermal activity German, Christopher R. Ramírez-Llodra, Eva Nakamura, Koichi Hydrothermal activity on the southern Mid-Atlantic Ridge: Tectonically- and volcanically-controlled venting at 4-5°S |
| description |
German, Christopher R. ... et. al.-- 13 pages, 10 figures, supplementary data associated with this article can be found, in the online version, at https://doi.org/10.1016/j.epsl.2008.06.048 |
| format |
artículo |
| topic_facet |
South Atlantic Tectonics Volcanism Mid-Atlantic Ridge Hydrothermal activity |
| author |
German, Christopher R. Ramírez-Llodra, Eva Nakamura, Koichi |
| author_facet |
German, Christopher R. Ramírez-Llodra, Eva Nakamura, Koichi |
| author_sort |
German, Christopher R. |
| title |
Hydrothermal activity on the southern Mid-Atlantic Ridge: Tectonically- and volcanically-controlled venting at 4-5°S |
| title_short |
Hydrothermal activity on the southern Mid-Atlantic Ridge: Tectonically- and volcanically-controlled venting at 4-5°S |
| title_full |
Hydrothermal activity on the southern Mid-Atlantic Ridge: Tectonically- and volcanically-controlled venting at 4-5°S |
| title_fullStr |
Hydrothermal activity on the southern Mid-Atlantic Ridge: Tectonically- and volcanically-controlled venting at 4-5°S |
| title_full_unstemmed |
Hydrothermal activity on the southern Mid-Atlantic Ridge: Tectonically- and volcanically-controlled venting at 4-5°S |
| title_sort |
hydrothermal activity on the southern mid-atlantic ridge: tectonically- and volcanically-controlled venting at 4-5°s |
| publisher |
Elsevier |
| publishDate |
2008-09-15 |
| url |
http://hdl.handle.net/10261/104416 |
| work_keys_str_mv |
AT germanchristopherr hydrothermalactivityonthesouthernmidatlanticridgetectonicallyandvolcanicallycontrolledventingat45s AT ramirezllodraeva hydrothermalactivityonthesouthernmidatlanticridgetectonicallyandvolcanicallycontrolledventingat45s AT nakamurakoichi hydrothermalactivityonthesouthernmidatlanticridgetectonicallyandvolcanicallycontrolledventingat45s |
| _version_ |
1777666211734093824 |