کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1046059 | 944856 | 2007 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Cirque glacier activity in arctic Norway during the last deglaciation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Numerous cirques of the Lofoten-VesterÃ¥len archipelago in northern Norway have distinct moraine sequences that previously have been assigned to the Allerød-Younger Dryas (â¼Â 13,400 to 11,700 yr BP) interval, constraining the regional distribution of the equilibrium-line altitude (ELA) of cirque and valley glaciers. Here we present evidence from a once glacier-fed lake on southern Andøya that contests this view. Analyses of radiocarbon dated lacustrine sediments including rock magnetic parameters, grain size, organic matter, dry bulk density and visual interpretation suggest that no glacier was present in the low-lying cirque during the Younger Dryas-Allerød. The initiation of the glacial retreat commenced with the onset of the Bølling warming (â¼Â 14,700 yr BP) and was completed by the onset of Allerød Interstade (â¼Â 13,400 yr BP). The reconstructed glacier stages of the investigated cirque coincide with a cool and dry period from â¼Â 17,500 to 14,700 yr BP and a somewhat larger Last Glacial Maximum (LGM) advance possibly occurring between â¼Â 21,050 and 19,100 yr BP.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Quaternary Research - Volume 68, Issue 3, November 2007, Pages 387-399
Journal: Quaternary Research - Volume 68, Issue 3, November 2007, Pages 387-399
نویسندگان
Ãyvind Paasche, Svein Olaf Dahl, Jostein Bakke, Reidar Løvlie, Atle Nesje,