Crustal and uppermost mantle structure of the Porcupine Basin west of Ireland from seismic and gravity methods

15 pages, 9 figures, 1 table, supplementary data https://doi.org/10.1016/j.marpetgeo.2022.105652

Detalles Bibliográficos
Autores: Tomar, Gaurav, O'Reilly, Brian M., Prada, Manel, Hardy, Robert, Bean, Christopher J., Singh, Satish C., Bérdi, Laura
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2022
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/272092
Acceso en línea:http://hdl.handle.net/10261/272092
Access Level:acceso abierto
Palabra clave:Mantle Serpentinisation
Porcupine Basin
Gravity Modelling
Seismic Processing
Mantle exhumation
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spelling Crustal and uppermost mantle structure of the Porcupine Basin west of Ireland from seismic and gravity methodsTomar, GauravO'Reilly, Brian M.Prada, ManelHardy, RobertBean, Christopher J.Singh, Satish C.Bérdi, LauraMantle SerpentinisationPorcupine BasinGravity ModellingSeismic ProcessingMantle exhumation15 pages, 9 figures, 1 table, supplementary data https://doi.org/10.1016/j.marpetgeo.2022.105652The Porcupine basin is a failed rift that formed during the opening of the North Atlantic Ocean. Here, we provide additional insights into the crustal structure of the northern Porcupine Basin and assess the degree of crustal extension from long streamer seismic data and free-air gravity modelling. Recent re-processing of the 2013/2014 streamer data involved de-multiple and de-noise processing with pre-stack-depth migration using velocity models derived from reflection travel time tomography and full waveform inversion. Forward modelling of satellite gravity data was used to constrain the velocity and mass density of the basement and lower crust, where the seismic constraints are limited. Prior knowledge, from previous geophysical and geological studies, was included to guide the modelling and reconcile the gravity data with the seismic sections. It also served to minimize the non-uniqueness inherent in the forward problem. Crustal thinning occurs across the basin axis and increases southwards. We infer maximum stretching factor (β) at the basin axis, increasing from ∼4 to 6 in the North Porcupine at 52.5°N to >10 at ∼51°N in the Central Porcupine. The gravity modelling supports the presence of mantle serpentinisation, and the high β implies that crustal break up and mantle exhumation may have locally occurred in the Central Porcupine Basin, in agreement with previous seismic tomographic studies. Basaltic melt generation in the centre of the basin where the maximum bulk stretching factor exceeds10 in the hyper-extended crust may have led to localized sea-floor-spreadingThis project was funded by the Irish centre for Research in Applied Geosciences (iCRAG), Science Foundation Ireland (SFI), Irish Shelf and Petroleum Studies Group (ISPSG) of the Petroleum Infrastructure Programme (PiP) and DIAS. This publication uses data reprocessed during a project undertaken on behalf of the Irish Shelf Petroleum Studies Group (ISPSG) of the Irish Petroleum Infrastructure Programme Group 4. The ISPSG comprises: AzEire Petroleum Ltd, Cairn Energy Plc, BP Exploration Operating Company Ltd, CNOOC Petroleum Europe Limited, ENI Ireland BV, Equinor Energy Ireland Limited, Europa Oil & Gas Plc, ExxonMobil E&P Ireland (Offshore) Ltd, Husky Energy, Petroleum Affairs Division of the Department of Communications, Climate Action and Environment, Providence Resources plc, Repsol Exploración SA, Sosina Exploration Ltd, Total EP, Tullow Oil Plc and Woodside Energy (Ireland) Pty Ltd”. Manel Prada has received funding support of the “Severo Ochoa Centre of Excellence” accreditation (CEX 2019-000928-S) of the Spanish Research Agency (AEI)Peer reviewedElsevierSFI Research Centre in Applied Geosciences (Ireland)Science Foundation IrelandIrish Shelf Petroleum Studies GroupAgencia Estatal de Investigación (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202220222022info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/272092reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1016/j.marpetgeo.2022.105652Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2720922026-05-22T06:33:51Z
dc.title.none.fl_str_mv Crustal and uppermost mantle structure of the Porcupine Basin west of Ireland from seismic and gravity methods
title Crustal and uppermost mantle structure of the Porcupine Basin west of Ireland from seismic and gravity methods
spellingShingle Crustal and uppermost mantle structure of the Porcupine Basin west of Ireland from seismic and gravity methods
Tomar, Gaurav
Mantle Serpentinisation
Porcupine Basin
Gravity Modelling
Seismic Processing
Mantle exhumation
title_short Crustal and uppermost mantle structure of the Porcupine Basin west of Ireland from seismic and gravity methods
title_full Crustal and uppermost mantle structure of the Porcupine Basin west of Ireland from seismic and gravity methods
title_fullStr Crustal and uppermost mantle structure of the Porcupine Basin west of Ireland from seismic and gravity methods
title_full_unstemmed Crustal and uppermost mantle structure of the Porcupine Basin west of Ireland from seismic and gravity methods
title_sort Crustal and uppermost mantle structure of the Porcupine Basin west of Ireland from seismic and gravity methods
dc.creator.none.fl_str_mv Tomar, Gaurav
O'Reilly, Brian M.
Prada, Manel
Hardy, Robert
Bean, Christopher J.
Singh, Satish C.
Bérdi, Laura
author Tomar, Gaurav
author_facet Tomar, Gaurav
O'Reilly, Brian M.
Prada, Manel
Hardy, Robert
Bean, Christopher J.
Singh, Satish C.
Bérdi, Laura
author_role author
author2 O'Reilly, Brian M.
Prada, Manel
Hardy, Robert
Bean, Christopher J.
Singh, Satish C.
Bérdi, Laura
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv SFI Research Centre in Applied Geosciences (Ireland)
Science Foundation Ireland
Irish Shelf Petroleum Studies Group
Agencia Estatal de Investigación (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Mantle Serpentinisation
Porcupine Basin
Gravity Modelling
Seismic Processing
Mantle exhumation
topic Mantle Serpentinisation
Porcupine Basin
Gravity Modelling
Seismic Processing
Mantle exhumation
description 15 pages, 9 figures, 1 table, supplementary data https://doi.org/10.1016/j.marpetgeo.2022.105652
publishDate 2022
dc.date.none.fl_str_mv 2022
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/272092
url http://hdl.handle.net/10261/272092
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.marpetgeo.2022.105652
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.81155

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