Micromorphology for Characterization of Depositional Processes in a Paleovalley Head in Pinhão Plateau/Guarapuava - Paraná

Authors

  • Karina de Cássia Gazola UNIOESTE
  • Julio Cesar Paisani UNIOESTE
  • Vitor Hugo Rosa Biffi UEM

DOI:

https://doi.org/10.5433/2447-1747.2021v30n1p405

Keywords:

Colluvium, Co-alluvium, Micromorphology, Sheet wash, Mud stream.

Abstract

In this study, we made use of micromorphological characterization in order to understand the processes of filling of a paleovalley head (paleo-valley floor of zero order) at the Pinhão Surface / Guarapuava. Based on macroscopic characterization, four sedimentary sequences that fill the paleovalley head were recognized: buried paleosol with cumulative top, lower colluvial-alluvial sequence (co-alluvial), intermediate colluvial sequence and superior colluvial sequence. We collected undisturbed samples for the micro-morphological analysis, which counted on nomenclature and descriptive criteria by Stoops. As a result, we identified the constituents related distribution (CRD) of the integrated type (enauli-porphoric and porphyrous-enaulic), points to different streams in the sedimentation process. Enaulic CRD presents granular aggregates and, in micro-aggregates, it indicates sheet wash. Phorphoric CRD, in its turn, exhibits a massive microstructure, pointing to dense stream, possibly mud streams. The materials that compose the colluvial-alluvial sequence (co-alluvial), intermediate colluvial sequence and the upper buried paleosol come from the process of sheet wash. From the superior colluvial sequence, the process of mud stream was predominant, and it led to the filling of the paleovalley head with the superior colluvial sequence.

Author Biographies

Karina de Cássia Gazola, UNIOESTE

She holds a master's degree in Geography from the State University of Western Paraná.

Julio Cesar Paisani, UNIOESTE

He holds a doctorate (2004) in Geography from the Federal University of Santa Catarina. He is an Associate Professor at the State University of Western Paraná.

Vitor Hugo Rosa Biffi, UEM

He is currently a student in the doctoral course at the Graduate Program in Geography at the State University of Maringá.

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Published

2020-12-30

How to Cite

Gazola, K. de C., Paisani, J. C., & Biffi, V. H. R. (2020). Micromorphology for Characterization of Depositional Processes in a Paleovalley Head in Pinhão Plateau/Guarapuava - Paraná. GEOGRAFIA (Londrina), 30(1), 405–420. https://doi.org/10.5433/2447-1747.2021v30n1p405

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