کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1879804 | 1042596 | 2007 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
U-ages in soils and groundwater evidencing wet periods 400-600Â kyr ago in southeast Brazil
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
تشعشع
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: U-ages in soils and groundwater evidencing wet periods 400-600Â kyr ago in southeast Brazil U-ages in soils and groundwater evidencing wet periods 400-600Â kyr ago in southeast Brazil](/preview/png/1879804.png)
چکیده انگلیسی
238U and its radiogenic daughter 234U have been utilized for dating soil formation and groundwater residence time during the last 1.5 million years, in this case based on the U-dissolution/precipitation occurring during modifications of the oxidation-reduction conditions. In this paper, we report a 400-600Â kyr proxy of wet periods from sediments occurring in a soil profile developed over rocks outcropping at the Paraná sedimentary basin in Brazil, and from groundwater exploited of Guarani aquifer at the same basin. The approaches indicated successful use of the U-modeled ages for suggesting wet periods exceeding the past 116-210Â kyr from previous studies.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Radiation and Isotopes - Volume 65, Issue 7, July 2007, Pages 776-783
Journal: Applied Radiation and Isotopes - Volume 65, Issue 7, July 2007, Pages 776-783
نویسندگان
D.M. Bonotto, J.R. Jiménez-Rueda,