DOI: 10.1016/j.quascirev.2017.11.015
Scopus记录号: 2-s2.0-85036470684
论文题名: Timing of Pleistocene glaciations in the High Atlas, Morocco: New 10Be and 36Cl exposure ages
作者: Hughes P.D. ; Fink D. ; Rodés Á. ; Fenton C.R. ; Fujioka T.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 180 起始页码: 193
结束页码: 213
语种: 英语
Scopus关键词: Climate change
; Statistics
; Timing circuits
; Active seismic
; Last Glacial Maximum
; Late Pleistocene
; Mediterranean basin
; Mediterranean region
; Moraine boulders
; Pleistocene glacial
; Younger Dryas
; Glacial geology
; beryllium isotope
; boulder
; chlorine
; cirque
; cosmogenic radionuclide
; glacial hydrology
; glacier advance
; Last Glacial Maximum
; marine isotope stage
; moraine
; Younger Dryas
; Atlantic Ocean
; Atlas Mountains
; High Atlas
; Morocco
; North Africa
英文摘要: This 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
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112335
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geography, School of Environment, Education and Development, The University of Manchester, Manchester, England M13 9PL, United Kingdom; Australian Nuclear Science and Technology Organisation, PMB1, Menai, NSW 2234, Australia; NERC Cosmogenic Isotope Analysis Facility, SUERC, Scottish Enterprise Technology Park, Rankine Avenue, East KilbrideScotland G75 0QF, United Kingdom; Colorado Mesa University, 1100 North Ave, Grand JunctionCO 81501, United States
Recommended Citation:
Hughes P.D.,Fink D.,Rodés Á.,et al. Timing of Pleistocene glaciations in the High Atlas, Morocco: New 10Be and 36Cl exposure ages[J]. Quaternary Science Reviews,2018-01-01,180