Skip to Main content Skip to Navigation
Theses

Modèles de dépôt sous-glaciaires et dynamique de remplissage des vallées tunnel : exemple au Quaternaire (Bray, Irlande) et application à l'Ordovicien supérieur de l'Anti-Atlas (Alnif, Maroc)

Abstract : The icehouse period during the lower Palaeozoic led to the development of large continental ice-sheet over the Gondwana. This ice-sheet fluctuated in size and repeatedly recovered the north-Gondwana platform. The resulting glacial record includes major erosional surfaces of regional extent, with subglacial landforms and morphologies, as well as glacial valleys and specific glaciogenic sedimentary record. Among these valleys, tunnel valleys refer to Quaternary analogues, associated with the development of ice-sheets over Europe and North-America. Tunnel valley defines elongated, linear to slightly sinuous depressions, measuring few kilometers in width and several kilometres in length. They start and terminate abruptly, are generally a few hundred of meters deep, and display frequent overdeepening along the floor. Ordovician tunnel valleys are described from North Africa to the Middle East. Ordovician glacial deposits are considered as a major target for hydrocarbon exploration in these regions, with tunnel valleys forming lithological heterogeneities with excellent reservoir properties. In Europe, Quaternary tunnel valleys are targeted for groundwater resources as they form reliable aquifers. A major interest therefore exists for these valleys, as well as a need for better understanding of the nature and the stratigraphy of the infill, their origin and the parameters controlling their distribution. The recherché project presented in this thesis is based on an extensive fieldwork that focused on three main issues, regarding tunnel valleys: (1) the subglacial environment, (2) the sedimentary processes and depositional environments associated with their infill and (3) the parameters controlling their distribution
Document type :
Theses
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-00837691
Contributor : Abes Star :  Contact
Submitted on : Monday, June 24, 2013 - 10:37:12 AM
Last modification on : Friday, February 14, 2020 - 12:36:03 PM
Long-term archiving on: : Wednesday, September 25, 2013 - 4:08:56 AM

File

these_A_CLERC_Sylvain_2012.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-00837691, version 1

Collections

Citation

Sylvain Clerc. Modèles de dépôt sous-glaciaires et dynamique de remplissage des vallées tunnel : exemple au Quaternaire (Bray, Irlande) et application à l'Ordovicien supérieur de l'Anti-Atlas (Alnif, Maroc). Sciences de la Terre. Université de Bourgogne, 2012. Français. ⟨NNT : 2012DIJOS041⟩. ⟨tel-00837691⟩

Share

Metrics

Record views

1081

Files downloads

6462