کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4725514 1639871 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The equivalent dose of different grain size quartz fractions from lakeshore sediments in the arid region of north China
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
The equivalent dose of different grain size quartz fractions from lakeshore sediments in the arid region of north China
چکیده انگلیسی

Equivalent dose (De) values were measured by using medium aliquots of different grain size quartz fractions of five lakeshore sediments from the arid region of north China. There are two different relationships between De values and grain sizes of these five samples. The first relationship is that the De values obtained from various grain sizes are in agreement within 1 delta errors. The second relationship is that De values are similar to each other for fractions between 125 and 300 μm, while the De value of the 63–90 μm fraction is 40∼55% smaller than others. For example, the De values obtained for sample #3 are 20.15 ± 1.19 Gy, 19.80 ± 0.83 Gy and 20.93 ± 1.06 Gy for fractions of 90–125, 125–150 and 250–300 μm respectively, but are 10.79 ± 0.84 Gy for the 63–90 μm fraction. The second relationship can't be interpreted by previous studies of both dosimetry and heterogeneous bleaching. It is deduced for sample #2, #3 and #6 that fine particles (<90 μm) intruded after the dominant sedimentation. Comparison of OSL ages from different grain size fractions of sample #2 with a radiocarbon age from the same lithologic layer supports that fractions coarser than 125 μm yield more reliable burial ages, while the fraction finer than 90 μm yields underestimated ages for some lakeshore sediments from this arid region.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Quaternary Geochronology - Volume 5, Issues 2–3, April–June 2010, Pages 205–211
نویسندگان
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