CRONOLOGÍA DE TALUDES CUARCÍTICOS DE MINAS GERAIS, BRASIL

Autores/as

DOI:

https://doi.org/10.4215/rm2022.e21032

Resumen

Los relieves montañosos cuarcíticos desarrollados en un clima de sabana tropical tienden a tener depósitos sedimentarios poco profundos. Esto se debe a los procesos de meteorización de bajo nivel de las rocas de cuarcita y la formación de rampas de coluvión en las laderas. Este estudio tiene como objetivo determinar las características de los materiales coluviales, particularmente el tamaño de grano, y analizar la cronología de los sedimentos por encima del saprolito, buscando identificar tasas de acumulación y establecer correlaciones con la dinámica de la evolución geomorfológica reciente de la cordillera Canastra en Minas Gerais, Brasil. Las muestras recolectadas en diferentes posiciones morfológicas se sometieron a análisis granulométrico y se fecharon mediante regeneración de alícuota única de luminiscencia estimulada ópticamente (OSL/SAR) y datación por radiocarbono. El análisis granulométrico mostró un predominio de materiales arenosos y gravosos y demostró que las rampas coluviales del área de estudio contienen materiales derivados de la descomposición de rocas cuarcíticas, acumuladas en perfiles someros y arenosos. La datación LOE/SAR indicó edades entre el final del Pleistoceno, sin exceder los 30.500 +/- 4.950 AP, hasta los 500 años AP, mientras que la datación 14C mostró edades entre 4460 +/- 30 AP y 1140 +/- 30 AP. Estos datos indican que los depósitos del área de estudio son relativamente recientes, lo que demuestra que las variaciones en el proceso de meteorización y formación de depósitos han sufrido cambios recientes, probablemente debido a las fluctuaciones climáticas y cambios en el régimen hidrológico regional.

Palabras clave: Cordillera Canastra, Reconstrucción Paleogeomorfológica, Meteorización de Cuarcitas, OSL, Cordillera Tropical

 

Biografía del autor/a

  • Silvio Carlos Rodrigues, Federal University of Uberlândia, Uberlândia (MG), Brazil

    PhD in Sciences (Physical Geography) from the University of São Paulo (1998). He chaired the Union of Brazilian Geomorphology in the biennium 2005/2006. He was a member of the Advisory Committee on Physical Geography of CNPQ (CA-SA) between 2008 and 2010. Member of the Chamber of Natural Resources (CRA) with FAPEMIG between 2014 and 2016. between the years 2008 to 2011, and the second time started in 2020. He is currently a member of the editorial board of GEOUSP magazines, Revista do Departamento de Geografia (USP), Brazilian Geographical Studies. He was a member of the EOLSS International Editorial Council of UNESCO, He was on the Editorial Board of the UFU Publishing House between 2008 and 2011. He is a reviewer for the Brazilian Journal of Geomorphology, Caminhos da Geografia Magazine (UFU. Online), Environmental Earth Sciences (SPRINGER). He was secretary of the Commission On Land Degradation And Desertification of the International Association of Geography between 2010 and 2012. He is currently a Full Professor at the Institute of Geography at the Federal University of Uberlândia, working on undergraduate and graduate courses, as well as a member of the Graduate Program -Graduation in Geography from UFU (Grade 5). He has experience in Geosciences, with an emphasis on Geomorphology, working mainly on the following subjects: geomorphology, geomorphological cartography, soil erosion, integrated environmental analysis and geomorphological mapping.

  • Fabiana Cristina dos Santos, Federal University of Uberlândia, Uberlândia (MG), Brazil

    DOCTOR IN GEOCHEMISTRY (2021) AT THE FEDERAL UNIVERSITY OF UBERLÂNDIA. RESEARCH MEMBER OF THE SOIL GEOMORPHOLOGY AND EROSION LABORATORY (LAGES/UFU).

  • Rui Filipe Ferreira Carvalho, Universitat de Barcelona, Barcelona, Espanha

    Professor at the University of Barcelona, acting Physical Geography and Planning.

  • Thallita Isabela Silva Martins Nazar, Federal University of Catalão, Catalão, Catalão, Brazil

    PhD in Geography (2018) by the Graduate Program in Geography at the Federal University of Uberlândia (MG). Master in Geography (2013) by the same institution (UFU). Specialist in Geomatics (2011) with emphasis in Geoprocessing by Faculdade Católica de Uberlândia. Graduated in Geography (Bachelor - 2010 and Bachelor - 2011) from the Federal University of Uberlândia. She has experience in Geomorphology, Geoprocessing and General Physical Geography; she develops works, mainly, in the areas of Geomorphological Cartography, Geocartography, Landscape Analysis, Relief Evolution and Geoheritage. She is a member of the Research Group "Integrated Studies in Geosciences and Geoheritage"-GPAT. Currently, she is Vice-coordinator of the Geography-Baccalaureate Course, Coordinator of the Cartography Laboratory and Coordinator of Extension and Culture at IGEO / UFCAT.

Publicado

2023-02-15

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