Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1879804 | Applied Radiation and Isotopes | 2007 | 8 Pages |
Abstract
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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
D.M. Bonotto, J.R. Jiménez-Rueda,