Search results for "Djado"

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Typology of Hirnantian glacial pavements in SW Djado Basin (NE Niger).

2006

11 pages; International audience

[SDE.MCG] Environmental Sciences/Global Changes[ SDE.MCG ] Environmental Sciences/Global ChangesLate Ordovicianglacial pavement[ SDU.STU.GM ] Sciences of the Universe [physics]/Earth Sciences/Geomorphology[SDU.STU.GM] Sciences of the Universe [physics]/Earth Sciences/GeomorphologyDjadosubglacial soft-bed deformationglaciationNigerComputingMilieux_MISCELLANEOUSice sheet
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Hirnantian glacial and deglacial record in SW Djado Basin (NE Niger).

2007

Pluridisciplinary fieldwork highlights features generated by an extended ice-sheet in the Djado Basin during the Hirnantian. Two glacial palaeovalley systems associated with glacial pavements and separated by thin glaciomarine interstadial series are revealed. Rigid glacial pavements characterised by abrasion erosion are differentiated from soft glacial pavements characterised by soft-bed deformation. Glacial pavements are associated with subglacial bedforms such as megaflutes, flutes and meltwater channels. They are also associated with clastic dykes and glaciotectonic structures such as deformed flutes, subglacial folds and duplex structures. This record demonstrates that ice was warm-bas…

[SDU.STU.GM] Sciences of the Universe [physics]/Earth Sciences/GeomorphologyGlacial landform[SDE.MCG]Environmental Sciences/Global ChangesSedimentary depositional environmentPaleontologyStadialGlacial period[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/GeomorphologyNigerMeltwaterGeomorphologyComputingMilieux_MISCELLANEOUSEarth-Surface Processesgeography[ SDU.STU.GM ] Sciences of the Universe [physics]/Earth Sciences/Geomorphologygeography.geographical_feature_categoryLate Ordovicianglaciation/Djadoice sheet[ SDE.MCG ] Environmental Sciences/Global ChangesU-shaped valley[SDE.MCG] Environmental Sciences/Global ChangesGeophysicsClastic rockIce sheetGeology
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