Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The application of U-isotopes to assess weathering in contrasted soil-water regime in Brazil

Full text
Rosolen, Vania [1] ; Bueno, Guilherme Taitson [2] ; Bonotto, Daniel Marcos [1]
Total Authors: 3
[1] Univ Estadual Paulista UNESP, Dept Petrol & Metalogenia, Campus Rio Claro, Av 24-A, 1515, CP 178, BR-13506900 Rio Claro, SP - Brazil
[2] Univ Fed Goias, Inst Estudos Socioambientais, Campus II, BR-74001970 Goiania, Go - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Applied Radiation and Isotopes; v. 132, p. 157-163, FEB 2018.
Web of Science Citations: 0

This paper presents the use of U-series radionuclides U-238 and U-234 to evaluate the biogeochemical disequilibrium in soil cover under a contrasted soil-water regime. The approach was applied in three profiles located in distinct topographical positions, from upslope ferralitic to downslope hydromorphic domain. The U fractionation data was obtained in the samples representing the saprolite and the superficial and subsuperficial soil horizons. The results showed a significant and positive correlation between U and the Total Organic Carbon (TOC). Soil organic matter has accumulated in soil due to hydromorphy. There is no evidence of positive correlation between U and Fe, as expected in lateritic soils. The advance of the hydromorphy on Ferralsol changes the weathering rates, and the ages of weathering are discussed as a function of the advance of waterlogged soil conditions from downslope. Also, the bioturbation could represent the other factor responsible to construct a more recent soil horizon. (AU)

FAPESP's process: 17/14168-1 - Soil-landscape, caracterization of the phases organo-metallic and prospection of refractory clay in the Ferralsol-Gleysol cover (Western of Minas Gerais State).
Grantee:Vania Silvia Rosolen
Support type: Regular Research Grants