CHRONOLOGY OF QUARTZITIC SLOPES FROM MINAS GERAIS, BRAZIL
Abstract
Quartzitic mountain reliefs developed in a tropical savanna climate tend to have shallow sedimentary deposits. This is due to low level weathering processes of quartzite rocks and formation of colluvium ramps on the slopes. This study aims to determine the characteristics of colluvial materials, particularly grain size, and to analyze sediment chronology above the saprolite, seeking to identify accumulation rates and make correlations with the dynamics of the recent geomorphological evolution of the Canastra range in Minas Gerais, Brazil. Samples collected in different morphological positions were submitted to granulometric analysis and dated by Optically Stimulated Luminescence Single Aliquote Regeneration (OSL/SAR) and radiocarbon dating. Grain size analysis showed a predominance of sandy and gravel materials and demonstrated that the colluvial ramps in the study area contain materials derived from the decomposition of quartzite rocks, accumulated in shallow and sandy profiles. LOE/SAR dating indicated ages between the end of the Pleistocene, not exceeding 30,500 +/- 4,950 BP, to 500 years BP, whereas the 14C dating showed ages between 4460 +/- 30 BP and 1140 +/- 30 BP. These data indicate that the deposits from the study area are relatively recent, which demonstrate that variations in the weathering process and deposit formation have undergone recent changes, probably due to climatic fluctuations and changes in the regional hydrological regime.
Keywords: Canastra Range, Paleogeomorphological Reconstruction, Weathering of Quartzites, OSL, Tropical Range
References
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GEE, G.W., BAUDER, J.W., 1986. Particle-size analysis. In: Klute, A. (Ed.), Methods of Soil Analysis: Part 1. Physical and Mineralogical Methods, 2nd edt., Agronomy, 9. Soil Science Society of America, Madison, USA, pp. 383–411.
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LEDRU, M.P., 1993. Late Quaternary Environmental and Climatic Changes in Central Brazil. Quaternary Research. v.39. p.90-98. https://doi.org/10.1006/qres.1993.1011
LIAN, O.B., ROBERTS, R.G., 2006. Dating the Quaternary: progress in luminescence dating of sediments. Quaternary Science Reviews, 25: 2449-2468. https://doi.org/10.1016/j.quascirev.2005.11.013
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MAGALHÃES, C. S., RODRIGUES, S.C., 2020. A aplicação de parâmetros morfométricos no estudo do relevo das bacias do Rio Santo Antônio e Ribeirão Grande, Serra da Canastra, Sudoeste de Minas Gerais. Caderno de Geografia, 30, n.esp. 1, 136-153. https://doi.org/10.5752/P.2318-2962.2020v30nesp1p136-153
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MADSEN, A.T., MURRAY, A.S., 2009. Optically stimulated luminescence dating of young sediments: A review. Geomorphology, 109: 3-16. https://doi.org/10.1016/j.geomorph.2008.08.020
MELLETT, C. L., 2013. Luminescence Dating. in British Society for Geomorphology Geomorphological Techniques, Chap. 4, Sec. 2.6 - https://geomorphology.org.uk/sites/default/files/geom_tech_chapters/4.2.6_LuminescenceDating.pdf.
MEYER, M.C., GLIGANIC L.A., JAIN M. SOHBATI,R., SCHMIDMAI D., 2020. Lithological controls on light penetration into rock surfaces – Implications for OSL and IRSL surface exposure dating. Radiation Meeasurements. https://doi.org/10.1016/j.radmeas.2018.03.004
NAZAR, T.I.S.M., 2018. O Chapadão do Diamante na Serra da Canastra/MG, Brasil: caracterização geomorfológica e análise integrada do meio físico a partir de dados multifontes. 2018. 270 f. Tese (Doutorado em Geografia) - Universidade Federal de Uberlândia, Uberlândia. http://dx.doi. org/10.14393/ufu.te.2018.6
NAZAR, T.I.S.M.; RODRIGUES, S. C., 2019 (a). Relevo do Chapadão do Diamante, Serra da Canastra/MG, Brasil: Compartimentação d Análise a Partir dos Aspectos Geomorfométricos. Rev. Bras. Geomorfol. (Online), São Paulo, v. 20, n. 1, p. 69-88. http://dx.doi.org/10.20502/rbg.v20i1.1300
NAZAR, T.I.S.M., RODRIGUES, S. C., 2019 (b). Mapping and Analysis of Surface Geocover in the Chapadão do Diamante – MG - Brazil. Mercator, Fortaleza, v. 18, may p.1-17. https://doi.org/10.4215/rm2019.e18010
OLIVEIRA, L. A. F., COTA, G.E.M., LIMA, L.B.S., MAGALHÃES JÚNIOR, A.C. 2018. Aplicação da Luminescência Opticamente Estimulada (LOE) como Subsídio aos Estudos de Capturas Fluviais Quaternárias: O Caso da Serra da Mantiqueira (Zona da Mata de Minas Gerais). Rev. Bras. Geomorfol. (Online), São Paulo, v.19, n.4, (Out-Dez) p.679-690. http://dx.doi.org/10.20502/rbg.v19i4.1341
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Published
15/02/2023
How to Cite
RODRIGUES, Silvio Carlos et al.
CHRONOLOGY OF QUARTZITIC SLOPES FROM MINAS GERAIS, BRAZIL.
Mercator, Fortaleza, v. 21, feb. 2023.
ISSN 1984-2201.
Available at: <http://www.mercator.ufc.br/mercator/article/view/e21032>. Date accessed: 23 apr. 2024.
doi: https://doi.org/10.4215/rm2022.e21032.
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