Caves and subterranean deposits of the Charente karst groundwater (Touvre Basin, La Rochefoucauld). "Ghost-rock" speleogenesis, karst records of Pleistocene and Holocene, role of site effect
type: Dataset
description: This PhD aims to study caves and subterranean karst infillings deposits from Charente (Touvre catchment) as a memory of past climate and environments. From the concept of site effect, the two studied caves (Bois du Clos and Fuie) show an original recording of the regional palaeoclimatic conditions of the Middle-Upper Pleistocene and of the Holocene. The prominent role of the ghost-rock processe during the long geological time of Lower Cretaceous (45 Ma) was demonstrated by the study of three quarries, drilling and the young cave of La Fuie. This alteration process explains the genesis of labyrinthic caves and also the complexity of the Touvre aquifer which supplies the city of Angoulême. Indeed the large water reserve is situated into the porous rock (slow drainage) while a small part is drained by the karst conduits (fast drainage coming from river losses). The geochemical, sedimentological and mineralogical studies of detrital infillings deposits into Bois du Clos and la Fuie allowed to characterize hydrosedimentary dynamics and palaeoenvironmental conditions between marine isotope stages 6 and 3, obtained by 14C et U/Th in speleothems of Bois du Clos cave. The microchemical imagery by X-ray fluorescence has highlighted the existence of some carbonated levels related to the process of speleogenesis by ghost rock and the major role of groundwater level fluctuations. The compared chronostratigraphic study of the regional speleological and archaeological sequences finally allowed reflecting the role of local and regional settings, as well as global parameters in palaeoclimate.
landing page: https://theses.hal.science/tel-00684382
keyword: aquifere
keyword: cave-infillings
keyword: charente
keyword: fantomisation
keyword: fluorescence-x
keyword: geochemistry
keyword: geochimie
keyword: ghost-rock-karstification
keyword: groundwater
keyword: infoeu-reposemanticsdoctoralthesis
keyword: palaeoenvironment
keyword: paleoenvironnement
keyword: remplissages-detritiques
keyword: sdeesenvironmental-sciencesenvironment-and-society
keyword: sdemcgenvironmental-sciencesglobal-changes
keyword: sduenvisciences-of-the-universe-physicscontinental-interfaces-environment
keyword: sdustugmsciences-of-the-universe-physicsearth-sciencesgeomorphology
keyword: sedimentologie
keyword: sedimentology
keyword: shsgeohumanities-and-social-sciencesgeography
keyword: speleo-karstologie
keyword: speleo-karstology
keyword: speleothemes
keyword: speleothems
keyword: theses
keyword: touvre
keyword: x-ray-fluorescence
issued: 2026-05-22T23:45:16.627499
modified: 2026-05-22T23:45:16.627505
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Caves and subterranean deposits of the Charente karst groundwater (Touvre Basin, La Rochefoucauld). "Ghost-rock" speleogenesis, karst records of Pleistocene and Holocene, role of site effect
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00684382
issued: 2026-05-22T23:45:16.677430
modified: 2026-05-22T23:45:16.563086