Challenging intraplate orogens: from geomorphology to lithospheric dynamic. The French Massif Central case study

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dc.contributor.authorMalcles, Oen_AU
dc.contributor.authorVernant, Pen_AU
dc.contributor.authorRitz, JFen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorCazes, Gen_AU
dc.contributor.authorFujioka, Ten_AU
dc.contributor.authorBraucher, Ren_AU
dc.contributor.authorCamps, Pen_AU
dc.date.accessioned2024-02-29T01:17:09Zen_AU
dc.date.available2024-02-29T01:17:09Zen_AU
dc.date.issued2020-05-04en_AU
dc.date.statistics2023-05-08en_AU
dc.description.abstractIn the 60’s, the formulation of the plate tectonic theory changed our understanding of the Earth dynamics. Aiming at explaining the earth first order kinematics, this primary theory of plate tectonic assumed rigid plates, a necessity to efficiently transfer stress from one boundary to another. If successful to explain, at first order, the plate-boundary evolutions, this theory fails when compared to the unpredicted but identified deformation located inside the plate-domains: the intraplate orogens. Indeed, the intraplate regions are thought to be slowly, if at all, deforming. Therefore, it is expected that intraplate regions do not show important finite deformation, that is to say, no mountains. Some intraplate regions, however, have important relief: the Snowy Mountains (Australia), the Ural Mountains (Russia) or the Massif Central (France) for examples. Traditionally, such regions are interpreted as old structures that are slowly eroded, interpretations that are most of the time weakly constrained. Our study is aiming at providing stronger constraints and then a better understanding of such challenging area that are the intraplate orogen domains. Because direct measurements of deformations (e.g. GNSS: Global Navigation Satellite System or InSAR: Interferometric Synthetic Aperture Radar) are most of the time below the precision level, it is necessary to derive this information from the landscape evolution. To do so, terrestrial cosmogenic nuclide (TCN) technics are a key method, allowing to constraint the temporal landscape evolution. Classically, two TCN-based approaches are used to quantify the landscape evolution rate: burial ages and watershed-wide denudation rates, based on measurement in quartz sediment of 10Be and 26Al concentrations, two radioactive cosmogenic isotopes. Using the Massif Central (France) as study area, we show that this region is currently deforming. From new geochronological constraints and a geomorphometric study, we propose that the region undergoes an active uplift encompassing the last c.a. 4 Ma. It can be explained by the combination of at least two phenomena: the first one is the uplift triggering event, that has yet to be clearly identified, and the second one: the erosional isostatic adjustment enhancing the first one and possibly continuing after the end of the first one.en_AU
dc.identifier.articlenumberEGU2020-20791en_AU
dc.identifier.citationMalcles, O., Vernant, P., Ritz, J.-F., Fink, D., Cazes, G., Fujioka, T., Braucher, R., Chéry, J., & Camps, P. (2020). Challenging intraplate orogens: from geomorphology to lithospheric dynamic. Presentation to the EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-20791. Retrieved from: https://doi.org/10.5194/egusphere-egu2020-8547en_AU
dc.identifier.conferenceenddate2020-05-08en_AU
dc.identifier.conferencenameEGU General Assembly 2020en_AU
dc.identifier.conferenceplaceOnlineen_AU
dc.identifier.conferencestartdate2020-05-04en_AU
dc.identifier.otherEGU2020-8547en_AU
dc.identifier.urihttps://doi.org/10.5194/egusphere-egu2020-8547en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15486en_AU
dc.language.isoenen_AU
dc.publisherCopernicus GmbHen_AU
dc.relation.urihttps://meetingorganizer.copernicus.org/EGU2020/EGU2020-8547.htmlen_AU
dc.subjectEvolutionen_AU
dc.subjectFranceen_AU
dc.subjectSedimentsen_AU
dc.subjectLevelsen_AU
dc.subjectAge estimationen_AU
dc.subjectMorphologyen_AU
dc.subjectPlate tectonicsen_AU
dc.subjectBeryllium 10en_AU
dc.subjectAluminium 26en_AU
dc.titleChallenging intraplate orogens: from geomorphology to lithospheric dynamic. The French Massif Central case studyen_AU
dc.typeConference Abstracten_AU
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