Burial ages, ghost-rocks and karst network structure. Insights from the Vis canyon (Southern France)

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dc.contributor.authorMalcles, Oen_AU
dc.contributor.authorVernant, Pen_AU
dc.contributor.authorChéry, Jen_AU
dc.contributor.authorRitz, JFen_AU
dc.contributor.authorCazes, Gen_AU
dc.contributor.authorFink, Den_AU
dc.date.accessioned2021-12-20T23:16:02Zen_AU
dc.date.available2021-12-20T23:16:02Zen_AU
dc.date.issued2020-10-21en_AU
dc.date.statistics2021-11-22en_AU
dc.description.abstractNew burial ages by measuring 26 Al / 10 Be isotopic ratios in three cavities near the Vis canyon (south of France, south-eastern limit of Grands-Causses) challenge the classic karstogenesis model. used to explain the structuring of networks. Indeed, the subhorizontal levels of underground galleries are generally used as markers of the position of the regional base level ( ie , river). If the relationship between burial age and height relative to the regional base level expected using the classical model per descensumfor the Scorpions caves (1.2 ± 0.4 Ma, +105 m relative to the base level -rnb-) and Bergougnous (1.2 ± 0.3 Ma, +117 m rnb) is in agreement with the quantification of the average regional incision rate (83 ± 35 m / Ma), it does not explain the age of 0.94 ± 0.07 Ma obtained for the infills of the horizontal levels of the Rocas located much higher in altitude (+317 m rnb). The first two cavities open directly into the gorges, while the third opens onto the plateau less than 4 km from the gorges. To our knowledge, this is the first time that quantitative data support the proposition that the model of regional karstogenesis controlled by the position of the base level is not universal. These dates make it possible to suggest that ghosting plays a primordial role in controlling the location of the sub-horizontal levels. This process internal to the karst relegates the role of the position of the regional base level to that of a simple external triggering of the hollowing out of the alteration products generated by the phantomization. © French group of geomorphologyen_AU
dc.identifier.citationMalcles, O., Vernant, P., Chéry, J., Ritz, J.-F., Cazes, G., & Fink, D. (2020). Burial ages, ghost-rocks and karst network structure. Insights from the Vis canyon (Southern France). Geomorphologie: relief, process, environment, 26(4), 255-264. doi:10.4000/geomorphologie.15043en_AU
dc.identifier.issn1957-777Xen_AU
dc.identifier.issue4en_AU
dc.identifier.journaltitleGeomorphologie: relief, process, environmenten_AU
dc.identifier.pagination255-264en_AU
dc.identifier.urihttps://doi.org/10.4000/geomorphologie.15043en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12594en_AU
dc.identifier.volume26en_AU
dc.language.isoenen_AU
dc.publisherGroupe français de géomorphologieen_AU
dc.subjectAluminium 26en_AU
dc.subjectBeryllium 10en_AU
dc.subjectCavesen_AU
dc.subjectGeomorphologyen_AU
dc.subjectMorphologyen_AU
dc.subjectSedimentsen_AU
dc.titleBurial ages, ghost-rocks and karst network structure. Insights from the Vis canyon (Southern France)en_AU
dc.typeJournal Articleen_AU
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