Seal bypass at the Giant Gjallar Vent (Norwegian Sea): Indications for a new phase of fluid venting at a 56-Ma-old fluid migration system
International audience The Giant Gjallar Vent (GGV), located in the Vøring Basin off mid-Norway, is one of the largest (~ 5 × 3 km) vent systems in the North Atlantic. The vent represents a reactivated former hydrothermal system that formed at about 56 Ma. It is fed by two pipes of 440 m and 480 m d...
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Online Access: | https://hal.archives-ouvertes.fr/hal-01054142 https://doi.org/10.1016/j.margeo.2014.03.006 |
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ftunivnantes:oai:HAL:hal-01054142v1 2023-05-15T17:35:23+02:00 Seal bypass at the Giant Gjallar Vent (Norwegian Sea): Indications for a new phase of fluid venting at a 56-Ma-old fluid migration system Dumke, Ines Berndt, Christian Crutchley, Gareth J. Krause, Stefan Liebetrau, Volker Gay, Aurélien Couillard, Melanie Helmholtz Centre for Ocean Research Kiel (GEOMAR) Bassins Géosciences Montpellier Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) 2014-05-01 https://hal.archives-ouvertes.fr/hal-01054142 https://doi.org/10.1016/j.margeo.2014.03.006 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.margeo.2014.03.006 hal-01054142 https://hal.archives-ouvertes.fr/hal-01054142 doi:10.1016/j.margeo.2014.03.006 ISSN: 0025-3227 Marine Geology https://hal.archives-ouvertes.fr/hal-01054142 Marine Geology, Elsevier, 2014, 351, pp.38-52. ⟨10.1016/j.margeo.2014.03.006⟩ Giant Gjallar Vent fluid pipe seal bypass overpressure build-up Voring Basin Norwegian Sea [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2014 ftunivnantes https://doi.org/10.1016/j.margeo.2014.03.006 2022-10-19T00:23:49Z International audience The Giant Gjallar Vent (GGV), located in the Vøring Basin off mid-Norway, is one of the largest (~ 5 × 3 km) vent systems in the North Atlantic. The vent represents a reactivated former hydrothermal system that formed at about 56 Ma. It is fed by two pipes of 440 m and 480 m diameter that extend from the Lower Eocene section up to the Base Pleistocene Unconformity (BPU). Previous studies based on 3D seismic data differ in their interpretations of the present activity of the GGV, describing the system as buried and as reactivated in the Upper Pliocene. We present a new interpretation of the GGV's reactivation, using high-resolution 2D seismic and Parasound data. Despite the absence of geochemical and hydroacoustic indications for fluid escape into the water column, the GGV appears to be active because of various seismic anomalies which we interpret to indicate the presence of free gas in the subsurface. The anomalies are confined to the Kai Formation beneath the BPU and the overlying Naust Formation, which are interpreted to act as a seal to upward fluid migration. The seal is breached by focused fluid migration at one location where an up to 100 m wide chimney-like anomaly extends from the BPU up to the seafloor. We propose that further overpressure build-up in response to sediment loading and continued gas ascent beneath the BPU will eventually lead to large-scale seal bypass, starting a new phase of venting at the GGV. Article in Journal/Newspaper North Atlantic Norwegian Sea Université de Nantes: HAL-UNIV-NANTES Norway Norwegian Sea Marine Geology 351 38 52 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Giant Gjallar Vent fluid pipe seal bypass overpressure build-up Voring Basin Norwegian Sea [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
Giant Gjallar Vent fluid pipe seal bypass overpressure build-up Voring Basin Norwegian Sea [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Dumke, Ines Berndt, Christian Crutchley, Gareth J. Krause, Stefan Liebetrau, Volker Gay, Aurélien Couillard, Melanie Seal bypass at the Giant Gjallar Vent (Norwegian Sea): Indications for a new phase of fluid venting at a 56-Ma-old fluid migration system |
topic_facet |
Giant Gjallar Vent fluid pipe seal bypass overpressure build-up Voring Basin Norwegian Sea [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience The Giant Gjallar Vent (GGV), located in the Vøring Basin off mid-Norway, is one of the largest (~ 5 × 3 km) vent systems in the North Atlantic. The vent represents a reactivated former hydrothermal system that formed at about 56 Ma. It is fed by two pipes of 440 m and 480 m diameter that extend from the Lower Eocene section up to the Base Pleistocene Unconformity (BPU). Previous studies based on 3D seismic data differ in their interpretations of the present activity of the GGV, describing the system as buried and as reactivated in the Upper Pliocene. We present a new interpretation of the GGV's reactivation, using high-resolution 2D seismic and Parasound data. Despite the absence of geochemical and hydroacoustic indications for fluid escape into the water column, the GGV appears to be active because of various seismic anomalies which we interpret to indicate the presence of free gas in the subsurface. The anomalies are confined to the Kai Formation beneath the BPU and the overlying Naust Formation, which are interpreted to act as a seal to upward fluid migration. The seal is breached by focused fluid migration at one location where an up to 100 m wide chimney-like anomaly extends from the BPU up to the seafloor. We propose that further overpressure build-up in response to sediment loading and continued gas ascent beneath the BPU will eventually lead to large-scale seal bypass, starting a new phase of venting at the GGV. |
author2 |
Helmholtz Centre for Ocean Research Kiel (GEOMAR) Bassins Géosciences Montpellier Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Dumke, Ines Berndt, Christian Crutchley, Gareth J. Krause, Stefan Liebetrau, Volker Gay, Aurélien Couillard, Melanie |
author_facet |
Dumke, Ines Berndt, Christian Crutchley, Gareth J. Krause, Stefan Liebetrau, Volker Gay, Aurélien Couillard, Melanie |
author_sort |
Dumke, Ines |
title |
Seal bypass at the Giant Gjallar Vent (Norwegian Sea): Indications for a new phase of fluid venting at a 56-Ma-old fluid migration system |
title_short |
Seal bypass at the Giant Gjallar Vent (Norwegian Sea): Indications for a new phase of fluid venting at a 56-Ma-old fluid migration system |
title_full |
Seal bypass at the Giant Gjallar Vent (Norwegian Sea): Indications for a new phase of fluid venting at a 56-Ma-old fluid migration system |
title_fullStr |
Seal bypass at the Giant Gjallar Vent (Norwegian Sea): Indications for a new phase of fluid venting at a 56-Ma-old fluid migration system |
title_full_unstemmed |
Seal bypass at the Giant Gjallar Vent (Norwegian Sea): Indications for a new phase of fluid venting at a 56-Ma-old fluid migration system |
title_sort |
seal bypass at the giant gjallar vent (norwegian sea): indications for a new phase of fluid venting at a 56-ma-old fluid migration system |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.archives-ouvertes.fr/hal-01054142 https://doi.org/10.1016/j.margeo.2014.03.006 |
geographic |
Norway Norwegian Sea |
geographic_facet |
Norway Norwegian Sea |
genre |
North Atlantic Norwegian Sea |
genre_facet |
North Atlantic Norwegian Sea |
op_source |
ISSN: 0025-3227 Marine Geology https://hal.archives-ouvertes.fr/hal-01054142 Marine Geology, Elsevier, 2014, 351, pp.38-52. ⟨10.1016/j.margeo.2014.03.006⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.margeo.2014.03.006 hal-01054142 https://hal.archives-ouvertes.fr/hal-01054142 doi:10.1016/j.margeo.2014.03.006 |
op_doi |
https://doi.org/10.1016/j.margeo.2014.03.006 |
container_title |
Marine Geology |
container_volume |
351 |
container_start_page |
38 |
op_container_end_page |
52 |
_version_ |
1766134533528223744 |