کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4679668 1634894 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Meteoritic and bedrock constraints on the glacial history of Frontier Mountain in northern Victoria Land, Antarctica
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
Meteoritic and bedrock constraints on the glacial history of Frontier Mountain in northern Victoria Land, Antarctica
چکیده انگلیسی
The bedrock surface on which FRO 01149 was found has wet-based glacial erosional features recording a former high-stand of the East Antarctic ice sheet. This ice sheet evidently overrode the highest peaks (> 2800 m a.s.l.) of the inland sector of the Transantarctic Mountains in northern Victoria Land. We argue that FRO 01149 was a local fall and that its survival on a glacially eroded bedrock surface constrains the age of the last overriding event to be older than ~ 3 Myr. The concentrations of in-situ produced cosmogenic 10Be, 26Al and 21Ne in a glacially eroded bedrock sample taken from near the summit of Frontier Mountain yield a surface exposure age of 4.4 Myr and indicate that the bedrock was covered by several meters of snow. The exposure age is also consistent with bedrock exposure ages of other summit plateaus in northern Victoria Land.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 270, Issues 3–4, 30 June 2008, Pages 308-315
نویسندگان
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