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Block 2: Post-orogenic evolution(s)

Post-orogenic evolution of mountain belts

Presentation

Two main cases are addressed: « passive » mountain belt collapse and « active » extensional reactivation of mountain belts.

Block 2 scientific challenges are:

To understand the possible post-orogenic fates of mountain belts and
To link up the W-Mediterranean tectonics (i.e. slab roll-back/break-off, back-arc extension & oceanization) with the Pyrenean/Alpine/Betics orogens.

Considering the Orogen’s playground, two main cases can be addressed:

« Passive » post-orogenic evolution: mostly recorded in the Central and Eastern Pyrenees, Orogenesis sensu stricto is not active anymore. However, seismicity is still significative and both surface/subsurface data is indicating differential vertical motions reponsible for formation of alteration surfaces subsequently faulted and uplifted. Transition to post-orogenic dynamic and post-orogenic lithospheric re-equilibration, closely linked with interacting climate and topographies, is still poorly understood.
« Active » post-orogenic evolution: mostly recorded along eastern Pyrenees, Gulf of Lion and the Betic-Rif systems, orogens are overprinted by active extension related to back-arc settings coupled with Tethyan slab roll-back / break-off. This is under the scope of Block 2 to investigate the control of former orogenic cycle (inherited structures, composition, thermicity, subduction polarity…) on subsequent active extension tectonics and their related basins.

View the results presented by Pr. Laurent Jolivet.

Kinematic reconstruction – Africa, Eurasia

Reconstructions of Mediterranean domain since 35 Ma

3-D reconstructions of the slab-retreat

Reconstructed cross-sections of the Gulf of Lion passive margin

Our team

The research team

Pr. Laurent Jolivet from Sorbonne University (Paris, France) is the Principal Investigator of Block 2.
4 PhDs and 1 Post-doc subject are dedicated to the Block 2 tasks. Researchers are mostly hosted in Orléans, Montpellier, Toulouse and Cergy universities (France).

PhDs and Post-docs

Eloise Bessière
Maxime Daudet
Adrien Romagny
Justine Villard
Oriol Gimeno-Vives

Blocks

WinterSchool-San Sebastian 2018

Publications

Géodynamique de la Méditerranée occidentale : une série de bassins d’arrière-arc dans un environnement montagneux.

Jolivet, L., Romagny, A., Augier, R., Bessière, E., Do Couto, D., Gorini, C., Caroir, F., & Suc, J.-P. (2019). Géodynamique de la Méditerranée occidentale : une série de bassins d’arrière-arc dans un environnement montagneux. Géochronique, 149, 20-26.

keywords: Western Mediterranean, Plate reconstructions, Slab retreat, Transfer zones, Exhumation, Weak crust.

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Detailed tectonic reconstructions of the Western Mediterranean region for the last 35 Ma, insights on driving mechanisms.

Romagny, A., Jolivet, L., Menant, A., Bessière, E., Maillard, A., Canva, A., Thinon, I., 2020. Detailed tectonic reconstructions of the Western Mediterranean region for the last 35 Ma, insights on driving mechanisms. BSGF-Earth Sciences Bulletin 191, 37,.

keywords: Western Mediterranean, plate reconstructions, slab retreat, transfer zones, exhumation, weak crust

DOI: https://doi.org/10.1051/bsgf/2020040

Transfer zones and associated volcanic province in the eastern Valencia Basin: Evidence for a hot rifted margin?

Maillard, A., Jolivet, L., Lofi, J., Thinon, I., Couëffé, R., Canva, A., & Dofal, A. (2020). Transfer zones and associated volcanic province in the eastern Valencia Basin: Evidence for a hot rifted margin?. Marine and Petroleum Geology, 104419.

keywords: Transfer zones, Northwestern mediterranean basins, Crust, Moho, Shear zones, Domes

DOI: https://doi.org/10.1016/j.marpetgeo.2020.104419

PhD Thesis: Évolution géodynamique des Zones Internes des Cordillères Bétiques (Andalousie, Espagne) : Apports d’une étude pluridisciplinaire du Complexe Alpujárride.

Eloïse Bessière. Évolution géodynamique des Zones Internes des Cordillères Bétiques (Andalousie, Espagne) : Apports d’une étude pluridisciplinaire du Complexe Alpujárride. Sciences de la Terre. Université d’Orléans, 2019. Français. ⟨tel-02392008⟩

keywords: Rift inheritances, métamorphisme HP/BT, exhumation , hyper-extension, datations 40Ar/39Ar, RSCM, Dorsale Calcaire, Péridotite Ronda, Cordillères Bétiques, Complexe Alpujárride

The Catalan magnetic anomaly: Its significance for the crustal structure of the Gulf of Lion passive margin and relationship to the Catalan transfer zone

Canva, A., Thinon, I., Peyrefitte, A., Coueffe, R., Maillard, A., Jolivet, L., Martelet, G., Lacquement, F., Guennoc, P. (2019). The Catalan magnetic anomaly: Its significance for the crustal structure of the Gulf of Lion passive margin and relationship to the Catalan transfer zone. Marine and Petroleum Geology.

keywords: geodynamics, mafic magma underplating, rifting, East Pyrenees

DOI: https://doi.org/10.1016/j.marpetgeo.2019.104174

Géodynamique de la Méditerranée

Jolivet, L., Romagny, A., & Menant, A. (2019). Géodynamique de la Méditerranée. Géochronique, 149, 14-19.

Fast dismantling of a mountain belt by mantle flow: late-orogenic evolution of Pyrenees and Liguro-Provençal rifting

Jolivet, L., Romagny, A., Gorini, C., Maillard, A., Thinon, I., et al.. (2019) Fast dismantling of a mountain belt by mantle flow: Late-orogenic evolution of Pyrenees and LiguroProvençalrifting. Tectonophysics, Elsevier, 2020, 776, pp.228312.

keywords: Gulf of Lion, Pyrenees Rifting, Exhumation, Lower crust, Asthenospheric ﬂow, Slab retreat, Back-arc extension

DOI: https://doi.org/10.1016/j.tecto.2019.228312