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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Rare earth elements in gneiss regoliths in southern Minas Gerais, Brazil

Full text
Author(s):
Edilene Pereira Ferreira [1] ; Adriano Ribeiro Guerra [2] ; Antonio Carlos de Azevedo [3]
Total Authors: 3
Affiliation:
[1] Universidade de São Paulo. ESALQ. Depto. de Ciência do Solo - Brasil
[2] Universidade de São Paulo. ESALQ. Depto. de Ciência do Solo - Brasil
[3] Universidade de São Paulo. ESALQ. Depto. de Ciência do Solo - Brasil
Total Affiliations: 3
Document type: Journal article
Source: Scientia Agricola; v. 78, n. 3 2020-05-18.
Abstract

ABSTRACT: Regolith characterization in its entirety is particularly difficult in gneissic regoliths due to the heterogeneity of their rock structure. Rare earth elements (REE) are a useful tool in helping understand the evolution of regoliths. This study relates the mineralogy and weathering indexes of three gneisses regoliths (P1-leucocratic, P2-mesocratic and P3-melanocratic gneisses) to the distribution of REE at depth. In soil, clay activity, iron and manganese oxides, CaO, SiO2, P2O5, TiO2, Fe2O3, and MgO showed high positive correlation with REE. The absolute content of REE was enriched in mafic minerals. At the interface between the soil and saprolite, the sum of absolute REE content was greater in soil than in saprolite in P1, while the opposite pattern was found in P2 and P3. The sums of absolute REE in the whole profiles did not overlap between P1, P2 and P3, and the absolute concentration of Gadolinium (Gd) differentiated the three gneisses in all and every horizon/layer of their regoliths without overlapping values. Normalized REE content was greater in the subsurface of P1 due to Eu content in plagioclase, and fractionation had less variation when estimated by Light REE / Heavy REE (LREE/HREE) than by La/Yb, since the variation in REE is great in gneisses (due to the segregation of minerals into bands), and had low levels of association with the Chemical Index of Alteration (CIA) and the Weathering Index of Parker (WIP). (AU)

FAPESP's process: 13/03703-2 - Soil-saprolite systems in southeast and northeast Brazil: morphological characteristics, geochemical-mineralogical evolution and environmental role
Grantee:Antonio Carlos de Azevedo
Support Opportunities: Regular Research Grants