New insights on the origin of Barra volcanic ridge system, offshore Ireland: A long-distance influence of the Iceland mantle plume
International audience The Iceland Plume has significantly impacted the North Atlantic region. Igneous edifices and large seamounts in the Rockall region were linked to Iceland plume pulsations during the Late Cretaceous to Mid-Eocene. In the south of the Rockall Basin a chain of northwest-southeast...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://insu.hal.science/insu-04155694 https://doi.org/10.1016/j.marpetgeo.2023.106237 |
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ftinsu:oai:HAL:insu-04155694v1 2023-07-30T04:04:20+02:00 New insights on the origin of Barra volcanic ridge system, offshore Ireland: A long-distance influence of the Iceland mantle plume Tomar, Gaurav Roy, Srikumar Bean, Christopher J. Singh, Satish C. O'Reilly, Brian Schofield, Nick Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) 2023 https://insu.hal.science/insu-04155694 https://doi.org/10.1016/j.marpetgeo.2023.106237 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marpetgeo.2023.106237 insu-04155694 https://insu.hal.science/insu-04155694 BIBCODE: 2023MarPG.15206237T doi:10.1016/j.marpetgeo.2023.106237 Marine and Petroleum Geology https://insu.hal.science/insu-04155694 Marine and Petroleum Geology, 2023, 152, ⟨10.1016/j.marpetgeo.2023.106237⟩ Tomography Rockall Basin Seismic interpretation Gravity & Magnetic Modelling Barra Volcanic Ridge System NAIP Earth Science [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2023 ftinsu https://doi.org/10.1016/j.marpetgeo.2023.106237 2023-07-12T16:21:53Z International audience The Iceland Plume has significantly impacted the North Atlantic region. Igneous edifices and large seamounts in the Rockall region were linked to Iceland plume pulsations during the Late Cretaceous to Mid-Eocene. In the south of the Rockall Basin a chain of northwest-southeast trending volcanic ridges known as the Barra Volcanic Ridge System (BVRS) have been identified on seismic and magnetic datasets. However, the timing, morphology, extent, and emplacement mechanism of the BVRS are not well understood. To investigate the volcanic ridge system, we analyze a 360-km-long pre-stack time migrated seismic section along the margin, which covers the southern extent of BVRS. The high velocity (4.5-4.8 km/s) obtained by using first arrival travel time tomography of downward continued data set, high magnetic anomaly and the typical morphology of the ridges suggest that they could be volcanoes of basaltic compositions. The integration of gravity and seismic data constrain the crustal structure and thickness, which indicates that the crust could be as thin as 4 km beneath the BVRS, requiring a maximum stretching factor >6. Folded compressional structures and lava flows within the Early Paleocene to Mid-Eocene sediments draping the volcanic ridges, suggest that these volcanic intrusions possibly have occurred post Early Paleocene age, which is approximately the same time-period when Iceland mantle plume arrived in the Rockall region. These results suggest that the BVRS developed because of pre-existing lithospheric configuration in the Rockall Basin and could be one of the southernmost volcanic provinces of the North Atlantic Igneous Province (NAIP). Article in Journal/Newspaper Iceland North Atlantic Institut national des sciences de l'Univers: HAL-INSU Barra ENVELOPE(-61.417,-61.417,-64.367,-64.367) Marine and Petroleum Geology 152 106237 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Tomography Rockall Basin Seismic interpretation Gravity & Magnetic Modelling Barra Volcanic Ridge System NAIP Earth Science [SDU]Sciences of the Universe [physics] |
spellingShingle |
Tomography Rockall Basin Seismic interpretation Gravity & Magnetic Modelling Barra Volcanic Ridge System NAIP Earth Science [SDU]Sciences of the Universe [physics] Tomar, Gaurav Roy, Srikumar Bean, Christopher J. Singh, Satish C. O'Reilly, Brian Schofield, Nick New insights on the origin of Barra volcanic ridge system, offshore Ireland: A long-distance influence of the Iceland mantle plume |
topic_facet |
Tomography Rockall Basin Seismic interpretation Gravity & Magnetic Modelling Barra Volcanic Ridge System NAIP Earth Science [SDU]Sciences of the Universe [physics] |
description |
International audience The Iceland Plume has significantly impacted the North Atlantic region. Igneous edifices and large seamounts in the Rockall region were linked to Iceland plume pulsations during the Late Cretaceous to Mid-Eocene. In the south of the Rockall Basin a chain of northwest-southeast trending volcanic ridges known as the Barra Volcanic Ridge System (BVRS) have been identified on seismic and magnetic datasets. However, the timing, morphology, extent, and emplacement mechanism of the BVRS are not well understood. To investigate the volcanic ridge system, we analyze a 360-km-long pre-stack time migrated seismic section along the margin, which covers the southern extent of BVRS. The high velocity (4.5-4.8 km/s) obtained by using first arrival travel time tomography of downward continued data set, high magnetic anomaly and the typical morphology of the ridges suggest that they could be volcanoes of basaltic compositions. The integration of gravity and seismic data constrain the crustal structure and thickness, which indicates that the crust could be as thin as 4 km beneath the BVRS, requiring a maximum stretching factor >6. Folded compressional structures and lava flows within the Early Paleocene to Mid-Eocene sediments draping the volcanic ridges, suggest that these volcanic intrusions possibly have occurred post Early Paleocene age, which is approximately the same time-period when Iceland mantle plume arrived in the Rockall region. These results suggest that the BVRS developed because of pre-existing lithospheric configuration in the Rockall Basin and could be one of the southernmost volcanic provinces of the North Atlantic Igneous Province (NAIP). |
author2 |
Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) |
format |
Article in Journal/Newspaper |
author |
Tomar, Gaurav Roy, Srikumar Bean, Christopher J. Singh, Satish C. O'Reilly, Brian Schofield, Nick |
author_facet |
Tomar, Gaurav Roy, Srikumar Bean, Christopher J. Singh, Satish C. O'Reilly, Brian Schofield, Nick |
author_sort |
Tomar, Gaurav |
title |
New insights on the origin of Barra volcanic ridge system, offshore Ireland: A long-distance influence of the Iceland mantle plume |
title_short |
New insights on the origin of Barra volcanic ridge system, offshore Ireland: A long-distance influence of the Iceland mantle plume |
title_full |
New insights on the origin of Barra volcanic ridge system, offshore Ireland: A long-distance influence of the Iceland mantle plume |
title_fullStr |
New insights on the origin of Barra volcanic ridge system, offshore Ireland: A long-distance influence of the Iceland mantle plume |
title_full_unstemmed |
New insights on the origin of Barra volcanic ridge system, offshore Ireland: A long-distance influence of the Iceland mantle plume |
title_sort |
new insights on the origin of barra volcanic ridge system, offshore ireland: a long-distance influence of the iceland mantle plume |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://insu.hal.science/insu-04155694 https://doi.org/10.1016/j.marpetgeo.2023.106237 |
long_lat |
ENVELOPE(-61.417,-61.417,-64.367,-64.367) |
geographic |
Barra |
geographic_facet |
Barra |
genre |
Iceland North Atlantic |
genre_facet |
Iceland North Atlantic |
op_source |
Marine and Petroleum Geology https://insu.hal.science/insu-04155694 Marine and Petroleum Geology, 2023, 152, ⟨10.1016/j.marpetgeo.2023.106237⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marpetgeo.2023.106237 insu-04155694 https://insu.hal.science/insu-04155694 BIBCODE: 2023MarPG.15206237T doi:10.1016/j.marpetgeo.2023.106237 |
op_doi |
https://doi.org/10.1016/j.marpetgeo.2023.106237 |
container_title |
Marine and Petroleum Geology |
container_volume |
152 |
container_start_page |
106237 |
_version_ |
1772815700259241984 |