New Magnetic compilation and interpretation of the Bay of Biscay and surrounding continental shelves

Producing accurate structural maps is a pre-requisite to unravel the tectonic evolution of a region. For this purpose, magnetic anomaly maps are helpful data sets for the identification and mapping of geological features. We compiled 154 marine surveys and 7 aeromagnetic campaigns covering the Bay o...

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Autores principales:	Le Maire Pauline, Thinon Isabelle, Tugend Julie, Issautier Benoît, Martelet Guillaume, Paquet Fabien, Proust Jean-Noël, Nalpas Thierry, Peyrefitte Aurélie, Canva Albane
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	magnetic compilation aeromagnetic data marine magnetic data bay of biscay passive margin segmentation ocean-continent-transition (oct) Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/dc4e0d4abc514048b25190f921f686e8
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spelling	oai:doaj.org-article:dc4e0d4abc514048b25190f921f686e82021-12-02T17:11:17ZNew Magnetic compilation and interpretation of the Bay of Biscay and surrounding continental shelves1777-581710.1051/bsgf/2021048https://doaj.org/article/dc4e0d4abc514048b25190f921f686e82021-01-01T00:00:00Zhttps://www.bsgf.fr/articles/bsgf/full_html/2021/01/bsgf200065/bsgf200065.htmlhttps://doaj.org/toc/1777-5817Producing accurate structural maps is a pre-requisite to unravel the tectonic evolution of a region. For this purpose, magnetic anomaly maps are helpful data sets for the identification and mapping of geological features. We compiled 154 marine surveys and 7 aeromagnetic campaigns covering the Bay of Biscay, its surrounding continental shelves and western part of the Pyrenees. As the initial data sets had heterogeneous acquisition parameters, we applied a series of transforms before merging the data. We performed a variable reduction to the pole to localize the extrema of the anomaly vertically to their causative sources and facilitate geological interpretations. The resulting intermediate resolution maps compiled at 500 m altitude offshore and 3000 m both on- and offshore, display magnetic trends and patterns. They are enhanced by several potential field operators (analytic signal, tilt angle, vertical derivative) enabling the interpretation of the geometry of the sources causing the anomaly (3D, 2D and 2.5D). The analysis of these magnetic maps allows us to precise the distribution and segmentation of crustal domains previously identified in the Bay of Biscay and its adjacent continental shelves. A series of crustal scale structures mapped onshore and formed during and after the Variscan orogeny show well on this new map compilation, allowing the continuous onshore-offshore mapping of some of them and revealing their role in segmenting the northern margin of the Bay of Biscay. This new compilation notably reveals variations in the magnetic signature of the Ocean-Continent-Transition (OCT) that we interpret as related to an increased magmatic production of the eastern part of the Bay of Biscay OCT during continental breakup. In addition to precise previous structural maps, this new magnetic compilation opens new perspectives for the interpretation of the Bay of Biscay geodynamic setting.Le Maire PaulineThinon IsabelleTugend JulieIssautier BenoîtMartelet GuillaumePaquet FabienProust Jean-NoëlNalpas ThierryPeyrefitte AurélieCanva AlbaneEDP Sciencesarticlemagnetic compilationaeromagnetic datamarine magnetic databay of biscaypassive margin segmentationocean-continent-transition (oct)GeologyQE1-996.5ENFRBSGF - Earth Sciences Bulletin, Vol 192, p 58 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	magnetic compilation aeromagnetic data marine magnetic data bay of biscay passive margin segmentation ocean-continent-transition (oct) Geology QE1-996.5
spellingShingle	magnetic compilation aeromagnetic data marine magnetic data bay of biscay passive margin segmentation ocean-continent-transition (oct) Geology QE1-996.5 Le Maire Pauline Thinon Isabelle Tugend Julie Issautier Benoît Martelet Guillaume Paquet Fabien Proust Jean-Noël Nalpas Thierry Peyrefitte Aurélie Canva Albane New Magnetic compilation and interpretation of the Bay of Biscay and surrounding continental shelves
description	Producing accurate structural maps is a pre-requisite to unravel the tectonic evolution of a region. For this purpose, magnetic anomaly maps are helpful data sets for the identification and mapping of geological features. We compiled 154 marine surveys and 7 aeromagnetic campaigns covering the Bay of Biscay, its surrounding continental shelves and western part of the Pyrenees. As the initial data sets had heterogeneous acquisition parameters, we applied a series of transforms before merging the data. We performed a variable reduction to the pole to localize the extrema of the anomaly vertically to their causative sources and facilitate geological interpretations. The resulting intermediate resolution maps compiled at 500 m altitude offshore and 3000 m both on- and offshore, display magnetic trends and patterns. They are enhanced by several potential field operators (analytic signal, tilt angle, vertical derivative) enabling the interpretation of the geometry of the sources causing the anomaly (3D, 2D and 2.5D). The analysis of these magnetic maps allows us to precise the distribution and segmentation of crustal domains previously identified in the Bay of Biscay and its adjacent continental shelves. A series of crustal scale structures mapped onshore and formed during and after the Variscan orogeny show well on this new map compilation, allowing the continuous onshore-offshore mapping of some of them and revealing their role in segmenting the northern margin of the Bay of Biscay. This new compilation notably reveals variations in the magnetic signature of the Ocean-Continent-Transition (OCT) that we interpret as related to an increased magmatic production of the eastern part of the Bay of Biscay OCT during continental breakup. In addition to precise previous structural maps, this new magnetic compilation opens new perspectives for the interpretation of the Bay of Biscay geodynamic setting.
format	article
author	Le Maire Pauline Thinon Isabelle Tugend Julie Issautier Benoît Martelet Guillaume Paquet Fabien Proust Jean-Noël Nalpas Thierry Peyrefitte Aurélie Canva Albane
author_facet	Le Maire Pauline Thinon Isabelle Tugend Julie Issautier Benoît Martelet Guillaume Paquet Fabien Proust Jean-Noël Nalpas Thierry Peyrefitte Aurélie Canva Albane
author_sort	Le Maire Pauline
title	New Magnetic compilation and interpretation of the Bay of Biscay and surrounding continental shelves
title_short	New Magnetic compilation and interpretation of the Bay of Biscay and surrounding continental shelves
title_full	New Magnetic compilation and interpretation of the Bay of Biscay and surrounding continental shelves
title_fullStr	New Magnetic compilation and interpretation of the Bay of Biscay and surrounding continental shelves
title_full_unstemmed	New Magnetic compilation and interpretation of the Bay of Biscay and surrounding continental shelves
title_sort	new magnetic compilation and interpretation of the bay of biscay and surrounding continental shelves
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/dc4e0d4abc514048b25190f921f686e8
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New Magnetic compilation and interpretation of the Bay of Biscay and surrounding continental shelves

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