Geochemical and visual indicators of hydrothermal fluid flow through a sediment-hosted volcanic ridge in the Central Bransfield Basin (Antarctica).
In the austral summer of 2011 we undertook an investigation of three volcanic highs in the Central Bransfield Basin, Antarctica, in search of hydrothermal activity and associated fauna to assess changes since previous surveys and to evaluate the extent of hydrothermalism in this basin. At Hook Ridge...
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ftdoajarticles:oai:doaj.org/article:7dfb4bcc8b10405c842d6148cbcf95c2 2023-05-15T13:35:01+02:00 Geochemical and visual indicators of hydrothermal fluid flow through a sediment-hosted volcanic ridge in the Central Bransfield Basin (Antarctica). Alfred Aquilina Douglas P Connelly Jon T Copley Darryl R H Green Jeffrey A Hawkes Laura E Hepburn Veerle A I Huvenne Leigh Marsh Rachel A Mills Paul A Tyler 2013-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0054686 https://doaj.org/article/7dfb4bcc8b10405c842d6148cbcf95c2 EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC3554642?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0054686 https://doaj.org/article/7dfb4bcc8b10405c842d6148cbcf95c2 PLoS ONE, Vol 8, Iss 1, p e54686 (2013) Medicine R Science Q article 2013 ftdoajarticles https://doi.org/10.1371/journal.pone.0054686 2022-12-31T12:03:46Z In the austral summer of 2011 we undertook an investigation of three volcanic highs in the Central Bransfield Basin, Antarctica, in search of hydrothermal activity and associated fauna to assess changes since previous surveys and to evaluate the extent of hydrothermalism in this basin. At Hook Ridge, a submarine volcanic edifice at the eastern end of the basin, anomalies in water column redox potential (E(h)) were detected close to the seafloor, unaccompanied by temperature or turbidity anomalies, indicating low-temperature hydrothermal discharge. Seepage was manifested as shimmering water emanating from the sediment and from mineralised structures on the seafloor; recognisable vent endemic fauna were not observed. Pore fluids extracted from Hook Ridge sediment were depleted in chloride, sulfate and magnesium by up to 8% relative to seawater, enriched in lithium, boron and calcium, and had a distinct strontium isotope composition ((87)Sr/(86)Sr = 0.708776 at core base) compared with modern seawater ((87)Sr/(86)Sr ≈ 0.70918), indicating advection of hydrothermal fluid through sediment at this site. Biogeochemical zonation of redox active species implies significant moderation of the hydrothermal fluid with in situ diagenetic processes. At Middle Sister, the central ridge of the Three Sisters complex located about 100 km southwest of Hook Ridge, small water column E(h) anomalies were detected but visual observations of the seafloor and pore fluid profiles provided no evidence of active hydrothermal circulation. At The Axe, located about 50 km southwest of Three Sisters, no water column anomalies in E(h), temperature or turbidity were detected. These observations demonstrate that the temperature anomalies observed in previous surveys are episodic features, and suggest that hydrothermal circulation in the Bransfield Strait is ephemeral in nature and therefore may not support vent biota. Article in Journal/Newspaper Antarc* Antarctica Bransfield Strait Directory of Open Access Journals: DOAJ Articles Austral Bransfield Strait Three Sisters ENVELOPE(-68.470,-68.470,-71.441,-71.441) Hook Ridge ENVELOPE(-143.667,-143.667,51.500,51.500) PLoS ONE 8 1 e54686 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Medicine R Science Q |
spellingShingle |
Medicine R Science Q Alfred Aquilina Douglas P Connelly Jon T Copley Darryl R H Green Jeffrey A Hawkes Laura E Hepburn Veerle A I Huvenne Leigh Marsh Rachel A Mills Paul A Tyler Geochemical and visual indicators of hydrothermal fluid flow through a sediment-hosted volcanic ridge in the Central Bransfield Basin (Antarctica). |
topic_facet |
Medicine R Science Q |
description |
In the austral summer of 2011 we undertook an investigation of three volcanic highs in the Central Bransfield Basin, Antarctica, in search of hydrothermal activity and associated fauna to assess changes since previous surveys and to evaluate the extent of hydrothermalism in this basin. At Hook Ridge, a submarine volcanic edifice at the eastern end of the basin, anomalies in water column redox potential (E(h)) were detected close to the seafloor, unaccompanied by temperature or turbidity anomalies, indicating low-temperature hydrothermal discharge. Seepage was manifested as shimmering water emanating from the sediment and from mineralised structures on the seafloor; recognisable vent endemic fauna were not observed. Pore fluids extracted from Hook Ridge sediment were depleted in chloride, sulfate and magnesium by up to 8% relative to seawater, enriched in lithium, boron and calcium, and had a distinct strontium isotope composition ((87)Sr/(86)Sr = 0.708776 at core base) compared with modern seawater ((87)Sr/(86)Sr ≈ 0.70918), indicating advection of hydrothermal fluid through sediment at this site. Biogeochemical zonation of redox active species implies significant moderation of the hydrothermal fluid with in situ diagenetic processes. At Middle Sister, the central ridge of the Three Sisters complex located about 100 km southwest of Hook Ridge, small water column E(h) anomalies were detected but visual observations of the seafloor and pore fluid profiles provided no evidence of active hydrothermal circulation. At The Axe, located about 50 km southwest of Three Sisters, no water column anomalies in E(h), temperature or turbidity were detected. These observations demonstrate that the temperature anomalies observed in previous surveys are episodic features, and suggest that hydrothermal circulation in the Bransfield Strait is ephemeral in nature and therefore may not support vent biota. |
format |
Article in Journal/Newspaper |
author |
Alfred Aquilina Douglas P Connelly Jon T Copley Darryl R H Green Jeffrey A Hawkes Laura E Hepburn Veerle A I Huvenne Leigh Marsh Rachel A Mills Paul A Tyler |
author_facet |
Alfred Aquilina Douglas P Connelly Jon T Copley Darryl R H Green Jeffrey A Hawkes Laura E Hepburn Veerle A I Huvenne Leigh Marsh Rachel A Mills Paul A Tyler |
author_sort |
Alfred Aquilina |
title |
Geochemical and visual indicators of hydrothermal fluid flow through a sediment-hosted volcanic ridge in the Central Bransfield Basin (Antarctica). |
title_short |
Geochemical and visual indicators of hydrothermal fluid flow through a sediment-hosted volcanic ridge in the Central Bransfield Basin (Antarctica). |
title_full |
Geochemical and visual indicators of hydrothermal fluid flow through a sediment-hosted volcanic ridge in the Central Bransfield Basin (Antarctica). |
title_fullStr |
Geochemical and visual indicators of hydrothermal fluid flow through a sediment-hosted volcanic ridge in the Central Bransfield Basin (Antarctica). |
title_full_unstemmed |
Geochemical and visual indicators of hydrothermal fluid flow through a sediment-hosted volcanic ridge in the Central Bransfield Basin (Antarctica). |
title_sort |
geochemical and visual indicators of hydrothermal fluid flow through a sediment-hosted volcanic ridge in the central bransfield basin (antarctica). |
publisher |
Public Library of Science (PLoS) |
publishDate |
2013 |
url |
https://doi.org/10.1371/journal.pone.0054686 https://doaj.org/article/7dfb4bcc8b10405c842d6148cbcf95c2 |
long_lat |
ENVELOPE(-68.470,-68.470,-71.441,-71.441) ENVELOPE(-143.667,-143.667,51.500,51.500) |
geographic |
Austral Bransfield Strait Three Sisters Hook Ridge |
geographic_facet |
Austral Bransfield Strait Three Sisters Hook Ridge |
genre |
Antarc* Antarctica Bransfield Strait |
genre_facet |
Antarc* Antarctica Bransfield Strait |
op_source |
PLoS ONE, Vol 8, Iss 1, p e54686 (2013) |
op_relation |
http://europepmc.org/articles/PMC3554642?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0054686 https://doaj.org/article/7dfb4bcc8b10405c842d6148cbcf95c2 |
op_doi |
https://doi.org/10.1371/journal.pone.0054686 |
container_title |
PLoS ONE |
container_volume |
8 |
container_issue |
1 |
container_start_page |
e54686 |
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1766060223766724608 |