Pedogeochemistry and micromorphology of oxisols e A basis for understanding etchplanation in the Araucárias Plateau (Southern Brazil) in the Late Quaternary Julio Cesar Paisani a, * , Marga Eliz Pontelli a, 1 , Antônio Carlos de Barros Corrêa b, 2 , Rafaela Ana Rech Rodrigues a,1 a Universidade Estadual do Oeste do Paraná, Campus Francisco Beltrão, Rua Maringá,1200, Vila Nova, Francisco Beltrão, Paraná 85605-010, Brazil b Universidade Federal de Pernambuco, Departamento de Ciências Geográficas, Av. Prof. Moraes Rego, 1235, Cidade Universitária, Recife, Pernambuco 50670-901, Brazil article info Article history: Received 18 April 2013 Accepted 23 July 2013 Keywords: Planed surfaces Laterization Paleoenvironment Bacia do Paraná (Paraná basin) Climate changes abstract Approximately five years ago, the Working Group on Ancient Surfaces and Long-Term Landscape Evo- lution was created to raise planed surfaces in Brazil, Argentina, Uruguay and Paraguay with the aim of establishing regional correlations of planed surfaces after the formation of the Gondwanan rocks in South America. In Brazil, planed surfaces were recognized and classified between 1940 and 1960 and were given various designations and different age estimates based on regional morphostratigraphic correlation attempts. In the last twenty years, the assumptions of those attempts began to be questioned on a large scale by studies in which empirical observations, mediated by the use of new methodologies, did not indicate such a direct relationship between the paleosurfaces and their long-term erosive origin. We identified eight staggered surfaces in the Araucárias Plateau, Southern Brazil, between the Iguazu and Uruguay Rivers. Initially, we attempted to understand the planed surfaces as classic pediplains, but we found weathering profiles of different thicknesses with oxisols downstream of the knickpoints, instead of correlative deposits. We understand these surfaces as planed surfaces or paleosurfaces without erosive interrelation between them, resulting from the action of etchplanation processes. This idea contradicts the classical perspective of Brazilian geomorphology that attributes the cyclical alternation of Quaternary paleoclimates to the evolution of the model of the subtropical landscapes. The hypothesis begins from the assumption that the model evolved from the binomial morphogenesis/pedogenesis in phase with the glacial/interglacial cycles. In this study, we attempt to demonstrate that the climactic controls on morphogenesis/pedogenesis are mediated by the responses of the weathered mantle on the scale of its chemical and microstructural organization, which does not always validate previous theoretical as- sumptions. In this article, we use the chemical composition, weathering indices, iron, mineralogy of the clays and micromorphology of the oxisols of surface 6 to propose a first approximation of the evolution of the planed surfaces regarding etchplanation in southern Brazil. The surfaces’ pedogeochemical and micromorphological properties reveal the following: a) hydrolysis is the main process of geochemical loss of geomorphic surfaces; b) geochemical erosion is more intense in the glacial periods, when the decreased temperature favors slower weathering in a more continuous manner; c) the pedobioclimatic imbalance generated by the input in interglacial periods favors mechanical erosion of the ground surface due to the substitution of the structure in blocks by microaggregates, which reduces the cohesiveness of the mantles of alteration; d) morphogenesis is most important in interglacial periods, promoting the truncation of oxisols; e) the oxisols from the remnants of the planed surfaces are actually renewed profiles younger than 500 Ky BP; f) models of long-term chemical denudation must take into consid- eration short-duration changes (25 Ky) in the pedogeochemical and structural processes of the solum. Ó 2013 Elsevier Ltd. All rights reserved. 1. Introduction Approximately five years ago, the Working Group on Ancient Surfaces and Long-Term Landscape Evolution was created to raise * Corresponding author. Tel.: þ55 46 35204880; fax: þ55 46 35204849. E-mail addresses: juliopaisani@hotmail.com, juliopaisani@pq.cnpq.br (J.C. Paisani), mepontelli@hotmail.com (M.E. Pontelli), biase2001@terra.com.br (A.C. de Barros Corrêa), rafaelarech@hotmail.com (R.A. Rech Rodrigues). 1 Tel.: þ55 46 35204880; fax: þ55 46 35204849. 2 Tel./fax: þ55 81 21268277. Contents lists available at ScienceDirect Journal of South American Earth Sciences journal homepage: www.elsevier.com/locate/jsames 0895-9811/$ e see front matter Ó 2013 Elsevier Ltd. All rights reserved. http://dx.doi.org/10.1016/j.jsames.2013.07.011 Journal of South American Earth Sciences 48 (2013) 1e12