Search results for "Intraclasts"

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Porewater pressure control on subglacial soft sediment remobilization and tunnel valley formation: A case study from the Alnif tunnel valley (Morocco)

2014

25 pages; International audience; In the eastern part of the Moroccan Anti-Atlas Mountains, the Alnif area exposes a buried Ordovician glacial tunnel valley (5 km wide, 180 m deep) cut into preglacial marine sediments. The preglacial sedimentary sequence, deposited in a marine environment, is characterized by a typical "layer-cake" configuration of permeable (sand) and impermeable (clays and early-cemented sandstones) layers. At the base of the tunnel valley, a discontinuous and fan-shaped glacial conglomeratic unit 10 to 15 m thick occurs, erosively deposited over preglacial marine sediments. The conglomeratic unit is composed of preglacial intraclasts embedded within a sandy matrix. Both …

SubglacialgeographyTunnel valleyTunnel valleygeography.geographical_feature_categorySediment remobilizationStratigraphyOrdovician[ SDU.STU.GL ] Sciences of the Universe [physics]/Earth Sciences/GlaciologyGeochemistryGeology[ SDU.STU.ST ] Sciences of the Universe [physics]/Earth Sciences/StratigraphyPorewater pressureConglomerate[SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/StratigraphyClastic rockSedimentary rock[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/GlaciologyGlacial periodHydrofracturingIce sheetMeltwaterIntraclastsGeomorphologyGeologySedimentary Geology
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