Timing of Pleistocene glaciations in the High Atlas, Morocco: New 10Be and 36Cl exposure ages

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dc.contributor.authorHughes, PDen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorRodés, Aen_AU
dc.contributor.authorFenton, CRen_AU
dc.contributor.authorFujioka, Ten_AU
dc.date.accessioned2021-12-16T04:57:21Zen_AU
dc.date.available2021-12-16T04:57:21Zen_AU
dc.date.issued2018-01-15en_AU
dc.date.statistics2021-11-16en_AU
dc.description.abstractThis paper presents data from 42 new samples yielding Late Pleistocene cosmogenic 10Be and 36Cl exposure ages of moraine boulders across a series of glaciated valleys in the Toubkal Massif (4167 m a.s.l.), High Atlas, Morocco. This represents the first comprehensive Pleistocene glacial chronology in North Africa and one of the largest datasets from the Mediterranean region. The timing of these glacier advances has major implications for understanding the influence of Atlantic depressions on moisture supply to North Africa and the Mediterranean basin during the Pleistocene. The oldest and lowest moraines which span elevations from ∼1900 to 2400 m a.s.l. indicate that the maximum glacier advance occurred from MIS 5 to 3 with a combined mean 10Be and 36Cl age of 50.2 ± 19.5 ka (1 SD; n = 12, 7 outliers). The next moraine units up-valley at higher elevations (∼2200–2600 m a.s.l.) yielded exposure ages close to the global Last Glacial Maximum (LGM) with a combined mean 10Be and 36Cl age of 22.0 ± 4.9 ka (1 SD; n = 9, 7 outliers). The youngest exposure ages are from moraines that were emplaced during the Younger Dryas with a combined mean 10Be and 36Cl age of 12.3 ± 0.9 ka (1 SD; n = 7, no outliers) and are found in cirques at the highest elevations ranging from ∼2900 to 3300 m a.s.l. From moraines predating the Younger Dryas, a large number of young outliers are spread evenly between 6 and 13 ka suggesting a continuing process of exhumation or repositioning of boulders during the early to mid-Holocene. This attests to active seismic processes and possibly intense erosion during this period. © 2017 Elsevier Ltd.en_AU
dc.identifier.citationHughes, P. D., Fink, D., Rodés, A., Fenton, C. R., & Fujioka, T. (2017). Timing of Pleistocene glaciations in the High Atlas, Morocco: New 10Be and 36Cl exposure ages. Quaternary Science Reviews, 180, 193-213. doi:10.1016/j.quascirev.2017.11.015en_AU
dc.identifier.issn0277-3791en_AU
dc.identifier.journaltitleQuaternary Science Reviewsen_AU
dc.identifier.pagination193-213en_AU
dc.identifier.urihttps://doi.org/10.1016/j.quascirev.2017.11.015en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12498en_AU
dc.identifier.volume180en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectAfricaen_AU
dc.subjectMoroccoen_AU
dc.subjectGlaciersen_AU
dc.subjectMorainesen_AU
dc.subjectErosionen_AU
dc.subjectQuaternary perioden_AU
dc.subjectPleistocene epochen_AU
dc.subjectSeismic effectsen_AU
dc.titleTiming of Pleistocene glaciations in the High Atlas, Morocco: New 10Be and 36Cl exposure agesen_AU
dc.typeJournal Articleen_AU
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