Valentin Laurent
Centre national de la recherche scientifique
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Featured researches published by Valentin Laurent.
Tectonics | 2018
Aurélien Rabillard; Laurent Jolivet; Laurent Arbaret; Eloïse Bessière; Valentin Laurent; Armel Menant; Romain Augier; Alexandre Beaudoin
Within deforming continental regions where metamorphic core complexes (MCCs) and synextensional granitoids are closely associated, deciphering the link between detachment faulting and magmatism often remains complex as (1) the rheological weakness of magma may stimulate mechanisms of strain localization, and conversely, (2) tectonic processes may open/close drains where magmas can intrude. Here we tackle this issue by focusing on the Cyclades with the comparison of five granitoid-cored MCCs (Tinos, Mykonos, Ikaria, Naxos, and Serifos) and their flanking detachment systems. In this region, granitoids were emplaced into the middle/upper crust over a relatively short time period (15–9 Ma), while metamorphic domes were largely exhumed after more than 10 Myr of extension. None of those intrusions thereby proves to be a real candidate for the genesis of MCCs but would rather be a consequence of a warmer regime during lithospheric thinning. However, all collected structural and kinematic data converge toward a regional scheme in which magmatic activity played a more pivotal role than previously postulated. Indeed, late evolution stages of MCCs were dynamically impacted by intrusions along which local and transient heterogeneities of the mechanical strength occurred, interfering with the sequential development of detachments. During their tectonically controlled emplacement, magmatic products intruded already formed detachments at depth, locally inhibiting their activity, associated with a contemporaneous upward migration of extensional deformation that tended to localize through time within intrusion roofs along rheological discontinuities. The newly formed detachments are expressed within granitoids through a continuum of deformation from comagmatic to ductile conditions, followed by cataclasis along detachments.
Journal of Metamorphic Geology | 2018
Valentin Laurent; Pierre Lanari; Inès Naïr; Romain Augier; Abdeltif Lahfid; Laurent Jolivet
High-pressure rocks such as eclogite and blueschist are metamorphic markers of paleo-subduction zones, and their formation at high-pressure and low-temperature conditions is relatively well understood since it has been the focus of numerous petrological investigations in the past 40 years. The tectonic mechanisms controlling their exhumation back to the surface are, however, diverse, complex and still actively debated. Although the Cycladic Blueschist Unit (CBU, Greece) is among the best worldwide examples for the preservation of eclogite and blueschist, the proposed P-T evolution followed by this unit within the Hellenic subduction zone is quite different from one study to another, hindering our comprehension of exhumation processes. In this study, we present an extensive petrological dataset that permits refinement of the shape of the P-T trajectory for different subunits of the CBU on Syros. High-resolution quantitative compositional mapping has been applied to support the thermobarometric investigations, which involve semi-empirical thermobarometry, garnet equilibrium modelling and P-T isochemical phase diagrams. The thermodynamic models highlight the powerful use of reactive bulk compositions approximated from local bulk compositions. The results were also
Tectonophysics | 2015
Laurent Jolivet; Armel Menant; Pietro Sternai; Aurélien Rabillard; Laurent Arbaret; Romain Augier; Valentin Laurent; Alexandre Beaudoin; Bernhard Grasemann; Benjamin Huet; Loïc Labrousse; Laetitia Le Pourhiet
Tectonophysics | 2015
Valentin Laurent; Alexandre Beaudoin; Laurent Jolivet; Laurent Arbaret; Romain Augier; Aurélien Rabillard; Armel Menant
Tectonophysics | 2016
Valentin Laurent; Laurent Jolivet; Vincent Roche; Romain Augier; Stéphane Scaillet; Giovanni Luca Cardello
Journal of Geodynamics | 2016
Vincent Roche; Valentin Laurent; Giovanni Luca Cardello; Laurent Jolivet; Stéphane Scaillet
Journal of Geodynamics | 2015
Alexandre Beaudoin; Romain Augier; Valentin Laurent; Laurent Jolivet; Abdeltif Lahfid; Valérie Bosse; Laurent Arbaret; Aurélien Rabillard; Armel Menant
Lithos | 2017
Valentin Laurent; Benjamin Huet; Loïc Labrousse; Laurent Jolivet; Patrick Monié; Romain Augier
The EGU General Assembly | 2014
Alexandre Beaudoin; Valentin Laurent; Romain Augier; Laurent Jolivet; Abdeltif Lahfid; Laurent Arbaret; Aurélien Rabillard
European geosciences union general assembly | 2014
Aurélien Rabillard; Laurent Jolivet; Laurent Arbaret; Valentin Laurent; Eloïse Bessière; Armel Menant