The North Pyrenean Frontal Thrust: structure, timing and late fluid circulation inferred from seismic and thermal-geochemical analyses of well data

During orogenesis, large-scale thrusts as orogenic fronts can act as conduits and/or barriers for fluid flow. Unravelling the timing and modes of tectonic activation of large-scale faults is crucial to understanding the relationship between fluid flow and deformation. The North Pyrenean Frontal Thru...

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Autores principales:	Barré Guillaume, Fillon Charlotte, Ducoux Maxime, Mouthereau Frédéric, Gaucher Eric C., Calassou Sylvain
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	pyrenees north pyrenean frontal thrust fluid inclusions thermochronology stable isotopes evaporites Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/990806d42902498fb041e6d63a8bf78a
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spelling	oai:doaj.org-article:990806d42902498fb041e6d63a8bf78a2021-11-08T15:17:49ZThe North Pyrenean Frontal Thrust: structure, timing and late fluid circulation inferred from seismic and thermal-geochemical analyses of well data1777-581710.1051/bsgf/2021046https://doaj.org/article/990806d42902498fb041e6d63a8bf78a2021-01-01T00:00:00Zhttps://www.bsgf.fr/articles/bsgf/full_html/2021/01/bsgf210019/bsgf210019.htmlhttps://doaj.org/toc/1777-5817During orogenesis, large-scale thrusts as orogenic fronts can act as conduits and/or barriers for fluid flow. Unravelling the timing and modes of tectonic activation of large-scale faults is crucial to understanding the relationship between fluid flow and deformation. The North Pyrenean Frontal Thrust (NPFT) corresponds to a major basement-involved thrust responsible for the northward overthrust of the pre-orogenic sediments on top of the Aquitaine Foreland Basin. This study questions the timing of activation of this thrust, its geometry, the nature of the last fluids, which circulated there, and its role on the circulation of fluids. The structural study confronted to published thermochronology data led to determine the timing of the two tectonic activations during the NPFT compression phase and to relate them to the fluid circulations. We constrain the first activation at Campanian times and link it to the leak of the deep gas reservoir present in depth, as the NPFT acted as a conduit. Then the NPFT acted as a barrier, probably due to the breccia consolidation during the Paleocene quiescence period. Finally, the Eocene-Oligocene reactivation led to fluid circulation of high salinity fluids from the Triassic evaporites leaching. This latter event is associated with a fracturing event and the late generation of calcite veins studied here. This is the first study in the Pyrenees directly applied to the NPFT which uses the association between fluid inclusions study, seismic and thermochronological data. It highlights that the NPFT may be an important structure responsible of the leakage of deep hydrocarbons reservoirs. It also shows the importance of the determination of the activation steps of large-scale faults to decipher the origin of fluid circulations in space and time.Barré GuillaumeFillon CharlotteDucoux MaximeMouthereau FrédéricGaucher Eric C.Calassou SylvainEDP Sciencesarticlepyreneesnorth pyrenean frontal thrustfluid inclusionsthermochronologystable isotopesevaporitesGeologyQE1-996.5ENFRBSGF - Earth Sciences Bulletin, Vol 192, p 52 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	pyrenees north pyrenean frontal thrust fluid inclusions thermochronology stable isotopes evaporites Geology QE1-996.5
spellingShingle	pyrenees north pyrenean frontal thrust fluid inclusions thermochronology stable isotopes evaporites Geology QE1-996.5 Barré Guillaume Fillon Charlotte Ducoux Maxime Mouthereau Frédéric Gaucher Eric C. Calassou Sylvain The North Pyrenean Frontal Thrust: structure, timing and late fluid circulation inferred from seismic and thermal-geochemical analyses of well data
description	During orogenesis, large-scale thrusts as orogenic fronts can act as conduits and/or barriers for fluid flow. Unravelling the timing and modes of tectonic activation of large-scale faults is crucial to understanding the relationship between fluid flow and deformation. The North Pyrenean Frontal Thrust (NPFT) corresponds to a major basement-involved thrust responsible for the northward overthrust of the pre-orogenic sediments on top of the Aquitaine Foreland Basin. This study questions the timing of activation of this thrust, its geometry, the nature of the last fluids, which circulated there, and its role on the circulation of fluids. The structural study confronted to published thermochronology data led to determine the timing of the two tectonic activations during the NPFT compression phase and to relate them to the fluid circulations. We constrain the first activation at Campanian times and link it to the leak of the deep gas reservoir present in depth, as the NPFT acted as a conduit. Then the NPFT acted as a barrier, probably due to the breccia consolidation during the Paleocene quiescence period. Finally, the Eocene-Oligocene reactivation led to fluid circulation of high salinity fluids from the Triassic evaporites leaching. This latter event is associated with a fracturing event and the late generation of calcite veins studied here. This is the first study in the Pyrenees directly applied to the NPFT which uses the association between fluid inclusions study, seismic and thermochronological data. It highlights that the NPFT may be an important structure responsible of the leakage of deep hydrocarbons reservoirs. It also shows the importance of the determination of the activation steps of large-scale faults to decipher the origin of fluid circulations in space and time.
format	article
author	Barré Guillaume Fillon Charlotte Ducoux Maxime Mouthereau Frédéric Gaucher Eric C. Calassou Sylvain
author_facet	Barré Guillaume Fillon Charlotte Ducoux Maxime Mouthereau Frédéric Gaucher Eric C. Calassou Sylvain
author_sort	Barré Guillaume
title	The North Pyrenean Frontal Thrust: structure, timing and late fluid circulation inferred from seismic and thermal-geochemical analyses of well data
title_short	The North Pyrenean Frontal Thrust: structure, timing and late fluid circulation inferred from seismic and thermal-geochemical analyses of well data
title_full	The North Pyrenean Frontal Thrust: structure, timing and late fluid circulation inferred from seismic and thermal-geochemical analyses of well data
title_fullStr	The North Pyrenean Frontal Thrust: structure, timing and late fluid circulation inferred from seismic and thermal-geochemical analyses of well data
title_full_unstemmed	The North Pyrenean Frontal Thrust: structure, timing and late fluid circulation inferred from seismic and thermal-geochemical analyses of well data
title_sort	north pyrenean frontal thrust: structure, timing and late fluid circulation inferred from seismic and thermal-geochemical analyses of well data
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/990806d42902498fb041e6d63a8bf78a
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The North Pyrenean Frontal Thrust: structure, timing and late fluid circulation inferred from seismic and thermal-geochemical analyses of well data

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