The role of inheritance in forming rifts and rifted margins and building collisional orogens: a Biscay-Pyrenean perspective

A long-standing challenge in tectonics is to evaluate the role of inheritance and define the initial conditions of a geodynamic system, which are prerequisites to understand and model its evolution with some accuracy. Here we revisit the concept of “inheritance” by distinguishing “interface shape in...

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Autores principales:	Manatschal Gianreto, Chenin Pauline, Lescoutre Rodolphe, Miró Jordi, Cadenas Patricia, Saspiturry Nicolas, Masini Emmanuel, Chevrot Sebastien, Ford Mary, Jolivet Laurent, Mouthereau Frédéric, Thinon Isabelle, Issautier Benoit, Calassou Sylvain
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	rift system reactivation inheritance orogenic system bay of biscay pyrenees Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/dd311431d5c845a499b0d874624442c7
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spelling	oai:doaj.org-article:dd311431d5c845a499b0d874624442c72021-11-08T15:18:16ZThe role of inheritance in forming rifts and rifted margins and building collisional orogens: a Biscay-Pyrenean perspective1777-581710.1051/bsgf/2021042https://doaj.org/article/dd311431d5c845a499b0d874624442c72021-01-01T00:00:00Zhttps://www.bsgf.fr/articles/bsgf/full_html/2021/01/bsgf210015/bsgf210015.htmlhttps://doaj.org/toc/1777-5817A long-standing challenge in tectonics is to evaluate the role of inheritance and define the initial conditions of a geodynamic system, which are prerequisites to understand and model its evolution with some accuracy. Here we revisit the concept of “inheritance” by distinguishing “interface shape inheritance”, which includes the transient thermal state and gravitational potential energy, and “persisting inheritance”, which encompasses long-lasting structural and compositional inheritance. This new approach allows us to investigate, at each stage of a Wilson Cycle, the interplay between inheritance (innate/“genetic code”) and the physical processes at play (extension/compression, magmatism etc.). The aim of this paper is to provide a conceptual framework that integrates the role of inheritance in the study of rifts, rifted margins and collisional orogens based on the work done in the OROGEN project, which focuses on the Biscay-Pyrenean system. The Biscay-Pyrenean rift system resulted from a multistage rift evolution that developed over a complex lithosphere pre-structured by the Variscan orogenic cycle. There is a general agreement that the Pyrenean-Cantabrian orogen resulted from the reactivation of an increasingly mature rift system along-strike, ranging from mature rifted margins in the west to an immature and segmented hyperextended rift in the east. However, different models have been proposed to explain the preceding rifting and its influence on the subsequent reactivation. Results from the OROGEN project highlight the sequential reactivation of rift-inherited decoupling horizons and identify the specific role of exhumed mantle, hyperextended and necking domains during compressional reactivation. They also highlight the contrasting fate of rift segment centres versus segment boundaries during convergence, explaining the non-cylindricity of internal parts of collisional orogens. Results from the OROGEN project also suggest that the role of inheritance is more important during the initial stages of collision, which may explain the higher complexity of internal parts of orogenic systems with respect to their external parts. In contrast, when the system involved in the orogeny is more mature, the orogenic evolution is mostly controlled by first-order physical processes as described in the Coulomb Wedge theory, for instance. This may account for the simpler and more continuous architecture of external parts of collisional orogens and may also explain why most numerical models can reproduce mature orogenic architectures with a better accuracy compared to those of initial collisional stages. The new concepts developed from the OROGEN research are now ready to be tested at other orogenic systems that result from the reactivation of rifted margins, such as the Alps, the Colombian cordilleras and the Caribbean, Taiwan, Oman, Zagros or Timor.Manatschal GianretoChenin PaulineLescoutre RodolpheMiró JordiCadenas PatriciaSaspiturry NicolasMasini EmmanuelChevrot SebastienFord MaryJolivet LaurentMouthereau FrédéricThinon IsabelleIssautier BenoitCalassou SylvainEDP Sciencesarticlerift systemreactivationinheritanceorogenic systembay of biscaypyreneesGeologyQE1-996.5ENFRBSGF - Earth Sciences Bulletin, Vol 192, p 55 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	rift system reactivation inheritance orogenic system bay of biscay pyrenees Geology QE1-996.5
spellingShingle	rift system reactivation inheritance orogenic system bay of biscay pyrenees Geology QE1-996.5 Manatschal Gianreto Chenin Pauline Lescoutre Rodolphe Miró Jordi Cadenas Patricia Saspiturry Nicolas Masini Emmanuel Chevrot Sebastien Ford Mary Jolivet Laurent Mouthereau Frédéric Thinon Isabelle Issautier Benoit Calassou Sylvain The role of inheritance in forming rifts and rifted margins and building collisional orogens: a Biscay-Pyrenean perspective
description	A long-standing challenge in tectonics is to evaluate the role of inheritance and define the initial conditions of a geodynamic system, which are prerequisites to understand and model its evolution with some accuracy. Here we revisit the concept of “inheritance” by distinguishing “interface shape inheritance”, which includes the transient thermal state and gravitational potential energy, and “persisting inheritance”, which encompasses long-lasting structural and compositional inheritance. This new approach allows us to investigate, at each stage of a Wilson Cycle, the interplay between inheritance (innate/“genetic code”) and the physical processes at play (extension/compression, magmatism etc.). The aim of this paper is to provide a conceptual framework that integrates the role of inheritance in the study of rifts, rifted margins and collisional orogens based on the work done in the OROGEN project, which focuses on the Biscay-Pyrenean system. The Biscay-Pyrenean rift system resulted from a multistage rift evolution that developed over a complex lithosphere pre-structured by the Variscan orogenic cycle. There is a general agreement that the Pyrenean-Cantabrian orogen resulted from the reactivation of an increasingly mature rift system along-strike, ranging from mature rifted margins in the west to an immature and segmented hyperextended rift in the east. However, different models have been proposed to explain the preceding rifting and its influence on the subsequent reactivation. Results from the OROGEN project highlight the sequential reactivation of rift-inherited decoupling horizons and identify the specific role of exhumed mantle, hyperextended and necking domains during compressional reactivation. They also highlight the contrasting fate of rift segment centres versus segment boundaries during convergence, explaining the non-cylindricity of internal parts of collisional orogens. Results from the OROGEN project also suggest that the role of inheritance is more important during the initial stages of collision, which may explain the higher complexity of internal parts of orogenic systems with respect to their external parts. In contrast, when the system involved in the orogeny is more mature, the orogenic evolution is mostly controlled by first-order physical processes as described in the Coulomb Wedge theory, for instance. This may account for the simpler and more continuous architecture of external parts of collisional orogens and may also explain why most numerical models can reproduce mature orogenic architectures with a better accuracy compared to those of initial collisional stages. The new concepts developed from the OROGEN research are now ready to be tested at other orogenic systems that result from the reactivation of rifted margins, such as the Alps, the Colombian cordilleras and the Caribbean, Taiwan, Oman, Zagros or Timor.
format	article
author	Manatschal Gianreto Chenin Pauline Lescoutre Rodolphe Miró Jordi Cadenas Patricia Saspiturry Nicolas Masini Emmanuel Chevrot Sebastien Ford Mary Jolivet Laurent Mouthereau Frédéric Thinon Isabelle Issautier Benoit Calassou Sylvain
author_facet	Manatschal Gianreto Chenin Pauline Lescoutre Rodolphe Miró Jordi Cadenas Patricia Saspiturry Nicolas Masini Emmanuel Chevrot Sebastien Ford Mary Jolivet Laurent Mouthereau Frédéric Thinon Isabelle Issautier Benoit Calassou Sylvain
author_sort	Manatschal Gianreto
title	The role of inheritance in forming rifts and rifted margins and building collisional orogens: a Biscay-Pyrenean perspective
title_short	The role of inheritance in forming rifts and rifted margins and building collisional orogens: a Biscay-Pyrenean perspective
title_full	The role of inheritance in forming rifts and rifted margins and building collisional orogens: a Biscay-Pyrenean perspective
title_fullStr	The role of inheritance in forming rifts and rifted margins and building collisional orogens: a Biscay-Pyrenean perspective
title_full_unstemmed	The role of inheritance in forming rifts and rifted margins and building collisional orogens: a Biscay-Pyrenean perspective
title_sort	role of inheritance in forming rifts and rifted margins and building collisional orogens: a biscay-pyrenean perspective
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/dd311431d5c845a499b0d874624442c7
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The role of inheritance in forming rifts and rifted margins and building collisional orogens: a Biscay-Pyrenean perspective

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