کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4725408 | 1639873 | 2007 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Was southern Sweden ice free at 19-25Â ka, or were the post LGM glacifluvial sediments incompletely bleached?
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The sediments are believed to have been deposited during deglaciation and appear to fall into two age groups: 19-25Â ka (mainly sandur sediments) and 33-73Â ka (mainly deltaic sediments). Compared to the expected ages (13-15Â ka), even the younger glacifluvial OSL ages appear up to 10 000 years (â¼25Â Gy) too old. The ages are nevertheless stratigraphically consistent and correspond between sites; we deduce that the 19-25Â ka ages are true deposition ages. For glacifluvial sedimentation to take place on the South Swedish Upland at this time either a very early deglaciation is required, or alternatively ice-free conditions just prior to the LGM. The deltaic sediments (33-73Â ka) were most likely not significantly bleached during deposition and thus they date events prior to the latest ice advance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Quaternary Geochronology - Volume 2, Issues 1â4, 2007, Pages 229-236
Journal: Quaternary Geochronology - Volume 2, Issues 1â4, 2007, Pages 229-236
نویسندگان
Helena Alexanderson, Andrew S. Murray,