Varajao C. A. C., Salgado A. A. R., Varajao A. F. D. C., Braucher R., Colin Fabrice, Nalini H. A. (2009). Estudo da evoluçao da paisagem do quadrilatero ferrifero (Minas Gerais, Brasil) por meio da mensuraçao das taxas de erosao (Be- 10) e da pedogênese = Evolution of the landscape in the region of quadrilatero ferrifero (Minas Gerais, Brazil) based on the measurement of erosion rates (Be-10) and pedogenesis. Revista Brasileira de Ciencia do Solo, 33 (5), p. 1409-1425. ISSN 0100-0683.
Titre du document
Estudo da evoluçao da paisagem do quadrilatero ferrifero (Minas Gerais, Brasil) por meio da mensuraçao das taxas de erosao (Be- 10) e da pedogênese = Evolution of the landscape in the region of quadrilatero ferrifero (Minas Gerais, Brazil) based on the measurement of erosion rates (Be-10) and pedogenesis
Varajao C. A. C., Salgado A. A. R., Varajao A. F. D. C., Braucher R., Colin Fabrice, Nalini H. A.
Source
Revista Brasileira de Ciencia do Solo, 2009,
33 (5), p. 1409-1425 ISSN 0100-0683
A geomorphological overview of the Quadrilatero Ferrifero reveals a conspicuous region where roots of metassedimentary Proterozoic strucutures, displaying young relief features, are in evidence over a sea of hills from the Archean basement. This paper deals with the landscape evolution in the "Quadrilatero Ferrifero" region, based on the integrated analysis of quantitative data of the erosion rates (Be-10) and of the soil types developed from the main rocks of the region. The Be-10 concentration extracted from quartz of veins, quartzites and fluvial sediments was measured by a mass spectrometer (accelerator). The mean erosion ratio of 7 m Ma(-1) highlights a significant regional epirogenetic uplift. In agreement, the macromorphological, mineralogical and micromorphological studies of all soil profiles, investigated by field work, X ray diffraction and optical microscopy, showed immature and autochthonous soils. These results suggest that the relief of the Quadrilatero Ferrifero is product of a constant and intense erosion process.
