Geochronological and paleoenvironmental reconstruction of colluvial deposits in a cuesta landscape in south-eastern Brazil

Author(s)

Pinton, Leandro De Godoi ^[1] ; Lupinacci, Cenira Maria ^[2]

Affiliation

^[1] Fed Univ Triangulo Mineiro UFTM, Dept Geog, Uberaba, MG - Brazil

^[2] Sao Paulo State Univ UNESP, Dept Geog & Environm Planning, Rio Claro, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF QUATERNARY SCIENCE; NOV 2021.
• Web of Science Citations: 0

Abstract

The classic models of cuesta evolution in south-eastern Brazil have temporal gaps in their denudation chronology. Here, we analyzed the colluvial deposits located on the rim of the Serra Geral escarpments in the Parana Basin to propose a model with an absolute age range of minor landform evolution within this cuesta morphology. Correlation of the optically stimulated luminescence ages with the regional paleoclimatic conditions demonstrates that the successive phases of colluviation reflect either short-term intervals of variability in moisture availability or dry periods in the Holocene. The potential effects of other contributing factors (vegetation changes, local geomorphic settings and human activity) add complexity to the denudation responsible for the development of the investigated geomorphic chronosequences. The proposed model consists of five stages of hillslope sediment remobilization that were responsible for further remodeling of the minor vertical steps during the following chronological distribution: (i) 9.13 +/- 1.2-7.09 +/- 0.96 ka; (ii) 5.66 +/- 0.86-4.5 +/- 0.75 ka; (iii) 3.94 +/- 0.605-3.45 +/- 0.6 ka; (iv) 2.66 +/- 0.315-2.3 +/- 0.4 ka; and (v) after 1960 to the present day. (AU)

• FAPESP's process: 12/20513-0 - Evolution of the morphogenetics processes in cuestiform relief: The Cavalheiro hydrographic basin - Analândia/SP
• Grantee: Leandro de Godoi Pinton
• Support Opportunities: Scholarships in Brazil - Doctorate