DOI: 10.1016/j.quascirev.2015.04.025
Scopus记录号: 2-s2.0-84930670062
论文题名: Drumlinised glaciofluvial and glaciolacustrine sediments on the Småland peneplain, South Sweden - new information on the growth and decay history of the Fennoscandian Ice Sheets during MIS 3
作者: Möller P. ; Murray A.S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 122 起始页码: 1
结束页码: 29
语种: 英语
英文关键词: Drumlins
; Fennoscandian Ice Sheet
; Glacial chronology
; Glacial sedimentology
; OSL dating
Scopus关键词: Flowing wells
; Geochronology
; Glacial geology
; Glaciers
; Isotopes
; Landforms
; Luminescence
; Sedimentary rocks
; Sedimentology
; Sediments
; Surficial sediments
; Drumlins
; Glacial chronology
; Glacial sedimentologies
; Ice sheet
; OSL dating
; Ice
; drumlin
; glacial sedimentation
; glaciofluvial deposit
; glaciolacustrine deposit
; ice sheet
; marine isotope stage
; paleoenvironment
; peneplain
; sediment core
; Baltic Region
; Fennoscandia
; Smaland
; Sweden
英文摘要: Dug trenches in sediment-cored drumlins on the Småland peneplain, southern Sweden, occurring intermixed with rock-cored drumlins, revealed sedimentary successions and facies suggesting that the core sediments were primarily deposited proglacially, both in glaciolacustrine settings as delta-front and more distal deeper-water sediments, and as glaciofluvial braidplain sediments. From the relationship between the drumlin sorted-sediment cores and their surficial drape by a till carapace, it is concluded that erosion was the main drumlin-forming process here, reshaping the original sediment morphology into streamlined landforms, after which a more or less thick traction till was deposited over the eroded and/or deformed ice-bed interface. Drumlin formation probably took place during the last deglaciation over the area. The drumlin-core sediments in 14 excavated trenches were dated by Optically Stimulated Luminescence (OSL); most retrieved ages fall into two distinct groups, both within Marine Isotope Stage 3 (c. 60-30ka). When plotted as mean OSL ages for each site, all but two sites fall either into an older age group, c. 48-56ka (seven sites), or into a younger age group, c. 28-38ka (five sites). These age intervals correlate well with the suggested time spans for the Ristinge and Klintholm ice advances in Denmark by ice flowing from the Baltic Basin westwards, terminating in fan-shaped patterns. These interstadial ice advances in the southwestern sector of the Fennoscandian Ice Sheet give rise to enigmatic questions on the physics and mechanics of ice sheet build-up and decay, especially as palaeoenvironmental data for northern Fennoscandia suggest widespread ice-free conditions within roughly the same time fame as the recorded ice advances in the south. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59889
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology/Quaternary Sciences, Lund University, Sölvegatan 12, Lund, Sweden; Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, DTU Risø Campus, Roskilde, Denmark
Recommended Citation:
Möller P.,Murray A.S.. Drumlinised glaciofluvial and glaciolacustrine sediments on the Småland peneplain, South Sweden - new information on the growth and decay history of the Fennoscandian Ice Sheets during MIS 3[J]. Quaternary Science Reviews,2015-01-01,122