An integrated view of the methane system in the pockmarks at Vestnesa Ridge, 79°N
Accepted manuscript version. Published version available at https://doi.org/10.1016/j.margeo.2017.06.006 . Accepted manuscript version, licensed CC BY-NC-ND 4.0. The Vestnesa Ridge is a NW-SE trending, ~ 100 km-long, 1–2 km-thick contourite sediment section located in the Arctic Ocean, west of Svalb...
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Online Access: | https://hdl.handle.net/10037/13279 https://doi.org/10.1016/j.margeo.2017.06.006 |
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ftunivtroemsoe:oai:munin.uit.no:10037/13279 2023-05-15T14:27:18+02:00 An integrated view of the methane system in the pockmarks at Vestnesa Ridge, 79°N Panieri, Giuliana Bünz, Stefan Fornari, Daniel J. Escartin, Javier Serov, Pavel Jansson, Pär Torres, Marta E. Hong, Wei-Li Sauer, Simone Garcia, Rafael Gracias, Nuno 2017-07-08 https://hdl.handle.net/10037/13279 https://doi.org/10.1016/j.margeo.2017.06.006 eng eng Elsevier Marine Geology info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Panieri, G., Bünz, S., Fornari, D.J., Escartin, J., Serov, P., Jansson, P., . Gracias, N. (2017). An integrated view of the methane system in the pockmarks at Vestnesa Ridge, 79°N. Marine Geology, 390, 282-300. https://doi.org/10.1016/j.margeo.2017.06.006 FRIDAID 1481561 doi:10.1016/j.margeo.2017.06.006 0025-3227 1872-6151 https://hdl.handle.net/10037/13279 openAccess VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 Fluid expulsions Methane Pockmarks Gas flares Seeps Gas hydrate Photomosaicing Carbonate concretions Chemosynthetic organisms Vestnesa Arctic Ocean Journal article Tidsskriftartikkel Peer reviewed 2017 ftunivtroemsoe https://doi.org/10.1016/j.margeo.2017.06.006 2021-06-25T17:55:48Z Accepted manuscript version. Published version available at https://doi.org/10.1016/j.margeo.2017.06.006 . Accepted manuscript version, licensed CC BY-NC-ND 4.0. The Vestnesa Ridge is a NW-SE trending, ~ 100 km-long, 1–2 km-thick contourite sediment section located in the Arctic Ocean, west of Svalbard, at 79°N. Pockmarks align along the ridge summit at water depths of ~ 1200 m; they are ~ 700 m in diameter and ~ 10 m deep relative to the surrounding seafloor. Observations of methane seepage in this area have been reported since 2008. Here we summarize and integrate the available information to date and report on the first detailed seafloor imaging and camera-guided multicore sampling at two of the most active pockmarks along Vestnesa Ridge, named Lomvi and Lunde. We correlate seafloor images with seismically defined subseafloor structures, providing a geological and ecological context to better understand pockmark formation. Subbottom and seismic surveys, water column imaging, geochemical data and seafloor observations indicate ongoing fluid flow at these pockmarks. Visual inspection and sampling using a high-resolution deep-sea camera and multicorer system show exposed gas hydrate and authigenic carbonate in association with biota within two of these pockmarks. Distributed methane venting at both Lomvi and Lunde supports extensive chemosynthetic communities that include filamentous sulfide-oxidizing bacteria and siboglinid tubeworms, all of which utilize chemical energy provided by the seeping fluids. Focused venting forms shallow gas hydrate, and sustains localized gas discharge from 50-m wide pits within the pockmarks. Cycles of carbonate precipitation and/or exhumation of carbonate deposits are indicated by scattered blocks of various size, pavements, and massive carbonate blocks up to 3 m high. Consistent with other observations along continental margin settings, we show that the extensive authigenic carbonate deposits in the Vestnesa pockmarks represent an important and prolonged methane carbon sink that prevents much of the upwardly flowing methane from reaching the overlying ocean. Article in Journal/Newspaper Arctic Arctic Arctic Ocean Lomvi Svalbard Lunde University of Tromsø: Munin Open Research Archive Arctic Arctic Ocean Lunde ENVELOPE(50.467,50.467,-66.967,-66.967) Ridge Summit ENVELOPE(162.750,162.750,-77.883,-77.883) Svalbard Marine Geology 390 282 300 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 Fluid expulsions Methane Pockmarks Gas flares Seeps Gas hydrate Photomosaicing Carbonate concretions Chemosynthetic organisms Vestnesa Arctic Ocean |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 Fluid expulsions Methane Pockmarks Gas flares Seeps Gas hydrate Photomosaicing Carbonate concretions Chemosynthetic organisms Vestnesa Arctic Ocean Panieri, Giuliana Bünz, Stefan Fornari, Daniel J. Escartin, Javier Serov, Pavel Jansson, Pär Torres, Marta E. Hong, Wei-Li Sauer, Simone Garcia, Rafael Gracias, Nuno An integrated view of the methane system in the pockmarks at Vestnesa Ridge, 79°N |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 Fluid expulsions Methane Pockmarks Gas flares Seeps Gas hydrate Photomosaicing Carbonate concretions Chemosynthetic organisms Vestnesa Arctic Ocean |
description |
Accepted manuscript version. Published version available at https://doi.org/10.1016/j.margeo.2017.06.006 . Accepted manuscript version, licensed CC BY-NC-ND 4.0. The Vestnesa Ridge is a NW-SE trending, ~ 100 km-long, 1–2 km-thick contourite sediment section located in the Arctic Ocean, west of Svalbard, at 79°N. Pockmarks align along the ridge summit at water depths of ~ 1200 m; they are ~ 700 m in diameter and ~ 10 m deep relative to the surrounding seafloor. Observations of methane seepage in this area have been reported since 2008. Here we summarize and integrate the available information to date and report on the first detailed seafloor imaging and camera-guided multicore sampling at two of the most active pockmarks along Vestnesa Ridge, named Lomvi and Lunde. We correlate seafloor images with seismically defined subseafloor structures, providing a geological and ecological context to better understand pockmark formation. Subbottom and seismic surveys, water column imaging, geochemical data and seafloor observations indicate ongoing fluid flow at these pockmarks. Visual inspection and sampling using a high-resolution deep-sea camera and multicorer system show exposed gas hydrate and authigenic carbonate in association with biota within two of these pockmarks. Distributed methane venting at both Lomvi and Lunde supports extensive chemosynthetic communities that include filamentous sulfide-oxidizing bacteria and siboglinid tubeworms, all of which utilize chemical energy provided by the seeping fluids. Focused venting forms shallow gas hydrate, and sustains localized gas discharge from 50-m wide pits within the pockmarks. Cycles of carbonate precipitation and/or exhumation of carbonate deposits are indicated by scattered blocks of various size, pavements, and massive carbonate blocks up to 3 m high. Consistent with other observations along continental margin settings, we show that the extensive authigenic carbonate deposits in the Vestnesa pockmarks represent an important and prolonged methane carbon sink that prevents much of the upwardly flowing methane from reaching the overlying ocean. |
format |
Article in Journal/Newspaper |
author |
Panieri, Giuliana Bünz, Stefan Fornari, Daniel J. Escartin, Javier Serov, Pavel Jansson, Pär Torres, Marta E. Hong, Wei-Li Sauer, Simone Garcia, Rafael Gracias, Nuno |
author_facet |
Panieri, Giuliana Bünz, Stefan Fornari, Daniel J. Escartin, Javier Serov, Pavel Jansson, Pär Torres, Marta E. Hong, Wei-Li Sauer, Simone Garcia, Rafael Gracias, Nuno |
author_sort |
Panieri, Giuliana |
title |
An integrated view of the methane system in the pockmarks at Vestnesa Ridge, 79°N |
title_short |
An integrated view of the methane system in the pockmarks at Vestnesa Ridge, 79°N |
title_full |
An integrated view of the methane system in the pockmarks at Vestnesa Ridge, 79°N |
title_fullStr |
An integrated view of the methane system in the pockmarks at Vestnesa Ridge, 79°N |
title_full_unstemmed |
An integrated view of the methane system in the pockmarks at Vestnesa Ridge, 79°N |
title_sort |
integrated view of the methane system in the pockmarks at vestnesa ridge, 79°n |
publisher |
Elsevier |
publishDate |
2017 |
url |
https://hdl.handle.net/10037/13279 https://doi.org/10.1016/j.margeo.2017.06.006 |
long_lat |
ENVELOPE(50.467,50.467,-66.967,-66.967) ENVELOPE(162.750,162.750,-77.883,-77.883) |
geographic |
Arctic Arctic Ocean Lunde Ridge Summit Svalbard |
geographic_facet |
Arctic Arctic Ocean Lunde Ridge Summit Svalbard |
genre |
Arctic Arctic Arctic Ocean Lomvi Svalbard Lunde |
genre_facet |
Arctic Arctic Arctic Ocean Lomvi Svalbard Lunde |
op_relation |
Marine Geology info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Panieri, G., Bünz, S., Fornari, D.J., Escartin, J., Serov, P., Jansson, P., . Gracias, N. (2017). An integrated view of the methane system in the pockmarks at Vestnesa Ridge, 79°N. Marine Geology, 390, 282-300. https://doi.org/10.1016/j.margeo.2017.06.006 FRIDAID 1481561 doi:10.1016/j.margeo.2017.06.006 0025-3227 1872-6151 https://hdl.handle.net/10037/13279 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1016/j.margeo.2017.06.006 |
container_title |
Marine Geology |
container_volume |
390 |
container_start_page |
282 |
op_container_end_page |
300 |
_version_ |
1766300989814472704 |