GEOMORPHOLOGICAL DYNAMICS OF THE ELEVATED GEOSYSTEMS OF THE BORBOREMA HIGHLANDS, NORTHEAST OF BRAZIL, FROM OPTICALLY STIMULATED LUMINESCENCE DATING OF HILLSLOPE SEDIMENTS

Autores

  • ANTONIO CARLOS DE BARROS CORRÊA Associate Professor, Department of Geographical Sciences.
  • KLEYTHON DE ARAUJO MONTEIRO Federal University of Pernambuco.

Palavras-chave:

hillslope sediments, Borborema Highlands, Luminescence dating, Paleoclimates

Resumo

The geomorphological dynamics of the elevated compartments of the Borborema Highlands, northeastern Brazil, were assessed through the analysis of hillslope sediments. The chosen study area was the Baixa Verde massif, in the State of Pernambuco. The main morphostratigraphic features were identified on the basis of their relevance to the reconstruction of the geomorphological dynamics. First hillslope deposits in the shape of colluvial fans, or infills of hollows and zero order catchments were identified. Following field study of the stratigraphic interactions in four sampling areas within the massif, samples were collected for a number of laboratory tests: sedimentological analysis, soil micromorphology and Optically Stimulated Luminescence (OSL) dating. A fragment of charcoal found on the top of a gravel layer was radiocarbon- dated. The sampling procedures were aimed at the characterization of the several depositional units. The results of the dating of 14 sampling sites point to the occurrence of discrete events of hillslope material remobilization within the last 20,000 years as a dynamic response of the geomorphological systems to the following events: the Last Glacial Maximum (LGM), the Pleistocene/Holocene transition, the mid-Holocene climatic optimum and the recent anthropic period and its short term climatic oscillations.

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Publicado

2020-08-14

Como Citar

ANTONIO CARLOS DE BARROS CORRÊA, & KLEYTHON DE ARAUJO MONTEIRO. (2020). GEOMORPHOLOGICAL DYNAMICS OF THE ELEVATED GEOSYSTEMS OF THE BORBOREMA HIGHLANDS, NORTHEAST OF BRAZIL, FROM OPTICALLY STIMULATED LUMINESCENCE DATING OF HILLSLOPE SEDIMENTS. William Morris Davis - Revista De Geomorfologia, 1(1), 162–185. Recuperado de //williammorrisdavis.uvanet.br/index.php/revistageomorfologia/article/view/32