Hot vents in an ice-cold ocean: Indications for phase separation at the southernmost area of hydrothermal activity, Bransfield Strait, Antarctica
International audience During the expeditions ANT-XV/2 with R/V Polarstern in 1997/98 and NBP 99-04 with R/V IB N.B. Palmer in 1999, the first samples of hydrothermally influenced sediments of Bransfield Strait were obtained at Hook Ridge, a volcanic edifice in the Central Basin of the Strait. The v...
Published in: | Earth and Planetary Science Letters |
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Online Access: | https://hal.science/hal-02639386 https://doi.org/10.1016/S0012-821X(01)00535-0 |
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ftinsu:oai:HAL:hal-02639386v1 2024-02-11T09:57:59+01:00 Hot vents in an ice-cold ocean: Indications for phase separation at the southernmost area of hydrothermal activity, Bransfield Strait, Antarctica Dählmann, A. Wallmann, Klaus Sahling, Heiko Sarthou, Géraldine Bohrmann, G. Petersenn, S. Chin, C. Klinkhammer, G. Helmholtz Centre for Ocean Research Kiel (GEOMAR) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) College of Earth, Ocean and Atmospheric Sciences Corvallis (CEOAS) Oregon State University (OSU) 2001-12-15 https://hal.science/hal-02639386 https://doi.org/10.1016/S0012-821X(01)00535-0 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/S0012-821X(01)00535-0 hal-02639386 https://hal.science/hal-02639386 doi:10.1016/S0012-821X(01)00535-0 ISSN: 0012-821X Earth and Planetary Science Letters https://hal.science/hal-02639386 Earth and Planetary Science Letters, 2001, 193 (3-4), pp.381-394. ⟨10.1016/S0012-821X(01)00535-0⟩ liquid phase separation hydrothermal vents Antarctica Bransfield Strait [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2001 ftinsu https://doi.org/10.1016/S0012-821X(01)00535-0 2024-01-24T17:34:03Z International audience During the expeditions ANT-XV/2 with R/V Polarstern in 1997/98 and NBP 99-04 with R/V IB N.B. Palmer in 1999, the first samples of hydrothermally influenced sediments of Bransfield Strait were obtained at Hook Ridge, a volcanic edifice in the Central Basin of the Strait. The vent sites are characterized by white siliceous crusts on top of the sediment layer and temperatures measured immediately on deck are up to 48.5°C. The shallow depth of these vent sites (1050 m) particularly controls the chemistry of the pore fluids that are enriched in silica and sulfide and show low pH values. Chloride is depleted up to 20% and the calculated hydrothermal endmember concentration is in the range of 1–84 mM. Since other mechanisms for Cl depletion can be ruled out clearly, the composition of this fluid is attributed to phase separation. While the Cl-depleted fluid is emanating at Hook Ridge, a Cl-enriched fluid can be identified in the adjacent King George Basin. Using a p,x diagram the two corresponding endmember concentrations reveal that the phase separation takes place at subcritical conditions (total depth: ∼2500 m), probably along the whole volcanic edifice. Article in Journal/Newspaper Antarc* Antarctica Bransfield Strait Institut national des sciences de l'Univers: HAL-INSU Bransfield Strait Central Basin ENVELOPE(178.000,178.000,-72.300,-72.300) Hook Ridge ENVELOPE(-143.667,-143.667,51.500,51.500) Earth and Planetary Science Letters 193 3-4 381 394 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
liquid phase separation hydrothermal vents Antarctica Bransfield Strait [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
liquid phase separation hydrothermal vents Antarctica Bransfield Strait [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Dählmann, A. Wallmann, Klaus Sahling, Heiko Sarthou, Géraldine Bohrmann, G. Petersenn, S. Chin, C. Klinkhammer, G. Hot vents in an ice-cold ocean: Indications for phase separation at the southernmost area of hydrothermal activity, Bransfield Strait, Antarctica |
topic_facet |
liquid phase separation hydrothermal vents Antarctica Bransfield Strait [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience During the expeditions ANT-XV/2 with R/V Polarstern in 1997/98 and NBP 99-04 with R/V IB N.B. Palmer in 1999, the first samples of hydrothermally influenced sediments of Bransfield Strait were obtained at Hook Ridge, a volcanic edifice in the Central Basin of the Strait. The vent sites are characterized by white siliceous crusts on top of the sediment layer and temperatures measured immediately on deck are up to 48.5°C. The shallow depth of these vent sites (1050 m) particularly controls the chemistry of the pore fluids that are enriched in silica and sulfide and show low pH values. Chloride is depleted up to 20% and the calculated hydrothermal endmember concentration is in the range of 1–84 mM. Since other mechanisms for Cl depletion can be ruled out clearly, the composition of this fluid is attributed to phase separation. While the Cl-depleted fluid is emanating at Hook Ridge, a Cl-enriched fluid can be identified in the adjacent King George Basin. Using a p,x diagram the two corresponding endmember concentrations reveal that the phase separation takes place at subcritical conditions (total depth: ∼2500 m), probably along the whole volcanic edifice. |
author2 |
Helmholtz Centre for Ocean Research Kiel (GEOMAR) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) College of Earth, Ocean and Atmospheric Sciences Corvallis (CEOAS) Oregon State University (OSU) |
format |
Article in Journal/Newspaper |
author |
Dählmann, A. Wallmann, Klaus Sahling, Heiko Sarthou, Géraldine Bohrmann, G. Petersenn, S. Chin, C. Klinkhammer, G. |
author_facet |
Dählmann, A. Wallmann, Klaus Sahling, Heiko Sarthou, Géraldine Bohrmann, G. Petersenn, S. Chin, C. Klinkhammer, G. |
author_sort |
Dählmann, A. |
title |
Hot vents in an ice-cold ocean: Indications for phase separation at the southernmost area of hydrothermal activity, Bransfield Strait, Antarctica |
title_short |
Hot vents in an ice-cold ocean: Indications for phase separation at the southernmost area of hydrothermal activity, Bransfield Strait, Antarctica |
title_full |
Hot vents in an ice-cold ocean: Indications for phase separation at the southernmost area of hydrothermal activity, Bransfield Strait, Antarctica |
title_fullStr |
Hot vents in an ice-cold ocean: Indications for phase separation at the southernmost area of hydrothermal activity, Bransfield Strait, Antarctica |
title_full_unstemmed |
Hot vents in an ice-cold ocean: Indications for phase separation at the southernmost area of hydrothermal activity, Bransfield Strait, Antarctica |
title_sort |
hot vents in an ice-cold ocean: indications for phase separation at the southernmost area of hydrothermal activity, bransfield strait, antarctica |
publisher |
HAL CCSD |
publishDate |
2001 |
url |
https://hal.science/hal-02639386 https://doi.org/10.1016/S0012-821X(01)00535-0 |
long_lat |
ENVELOPE(178.000,178.000,-72.300,-72.300) ENVELOPE(-143.667,-143.667,51.500,51.500) |
geographic |
Bransfield Strait Central Basin Hook Ridge |
geographic_facet |
Bransfield Strait Central Basin Hook Ridge |
genre |
Antarc* Antarctica Bransfield Strait |
genre_facet |
Antarc* Antarctica Bransfield Strait |
op_source |
ISSN: 0012-821X Earth and Planetary Science Letters https://hal.science/hal-02639386 Earth and Planetary Science Letters, 2001, 193 (3-4), pp.381-394. ⟨10.1016/S0012-821X(01)00535-0⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/S0012-821X(01)00535-0 hal-02639386 https://hal.science/hal-02639386 doi:10.1016/S0012-821X(01)00535-0 |
op_doi |
https://doi.org/10.1016/S0012-821X(01)00535-0 |
container_title |
Earth and Planetary Science Letters |
container_volume |
193 |
container_issue |
3-4 |
container_start_page |
381 |
op_container_end_page |
394 |
_version_ |
1790593522714279936 |