MORPHOSTRATIGRAPHY OF FERRUGINOUS DURICRUSTS IN THE NORTHWEST OF PARANÁ

Marcel Hideyuki Fumiya,Silvana Bressan Riffel,Leonardo José Cordeiro Santos

doi:10.20502/rbg.v20i4.1501

Abstract

Soils constitute an important mean for studying the conditioning processes of the evolution of the relief, considering that in them materials related to events modeling the relief can be preserved. In the Northwest region of Paraná, a manifestation of ferruginous duricrust related to relief sculpture is observed, but there are no detailed studies on these deposits. In this sense, this work aims to analyze these ferruginous materials present in the study area, through the morphological description of profiles with duricrusts, as well as to study these materials by X-ray diffraction and micromorphology, seeking to understand the current organization of ferruginous materials on top of hillocks and hills. Therefore, a mapping of relief features supported by ferruginous duricrusts, previously identified by Fumiya et al., (2016) was used. A morphological description of profiles with ferruginous duricrust in 14 relief features showed that 11 features present truncations between horizons and colluvial layers, indicating that probably the duricrusts are rudaceous paleopavement, that were covered by colluvium.

Highlights

Analyzing landforms and the processes responsible for their evolution are fundamental for understanding the past and present configuration of the landscape (RIBEIRO et al, 2012).The study of the origin and evolution of the relief by correlative deposits allows us to identify evidence related to the relief-forming processes, since these deposits can be testimonies capable of elucidating which geomorphological processes were responsible for the modeling sculpture (MISSURA, 2005)
In the Northwestern region of Paraná (Figure 1), correlative deposit records exist, as in the study by Justus (1985), that prove the occurrence of ferruginous duricrust1 fragments, mobilized along slopes, and which are currently organized in stone lines
The mineral characterization was performed by X-ray diffraction (XRD), and the samples were analyzed by the powder method in an X-ray diffractometer

Summary

Introduction

Analyzing landforms and the processes responsible for their evolution are fundamental for understanding the past and present configuration of the landscape (RIBEIRO et al, 2012).The study of the origin and evolution of the relief by correlative deposits allows us to identify evidence related to the relief-forming processes, since these deposits can be testimonies capable of elucidating which geomorphological processes were responsible for the modeling sculpture (MISSURA, 2005). Analyzing landforms and the processes responsible for their evolution are fundamental for understanding the past and present configuration of the landscape (RIBEIRO et al, 2012). Despite the allusion of the presence of ferruginous duricrust fragments on top of prominent relief feature in the Northwest of Paraná, there is only a profile description in “Serra dos Dourados” (JUSTUS, 1985), located in the interfluve between the Ivaí and the Piquiri river basins. In this sense, no detailed study has been carried out in an attempt to understand the meaning of the presence of duricrust in the landscape

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Conclusion