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The role of lithological and tectonic structures in the evolution of the river system in the mountainous region of the Espírito Santo: the case of river basin Benevente

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Author(s):
Roberto José Hezer Moreira Vervloet
Total Authors: 1
Document type: Doctoral Thesis
Press: São Paulo.
Institution: Universidade de São Paulo (USP). Faculdade de Filosofia, Letras e Ciências Humanas (FFLCH/SBD)
Defense date:
Examining board members:
Jurandyr Luciano Sanches Ross; Adilson Avansi de Abreu; Antonio Carlos Colangelo; Silvio Carlos Rodrigues; Antonio Carlos Vitte
Advisor: Jurandyr Luciano Sanches Ross
Abstract

The role of lithology and Proterozoic tectonic organization for understanding the genesis of relief in terms of differential erosion, has been relatively neglected in recent decades in boon of lines of explanation based on paleoclimatic changes, modern tectonics, and geochemistry. This fact has allowed the formation of \"closed\" on the genesis and dynamics of relief explanatory models. However, in sites of crystalline basement tectonics organization and compositional diversity chemical-mineralogical Rocks strongly supports the understanding of the role of differential erosion, in explaining the diversity of geomorphic compartments. The tectonic organization of the rocks through system failure and bottom folds (studied in the 1950s by Francis Ruellan) plays a fundamental role in understanding the processes of differential erosion responsible for the diversity of geomorphic compartments. In this sense, this work seeks to prove, by the method of the Association and Indeterminacy Geomorphological Leopold and Langbein (1970), the mountainous region of the Espírito Santo, and in special the river basin Benevente is the result of differential erosion of rocks rich chemical-mineralogical diversity, organized by folds background and strike-slip fault systems combined. To carry out this research hydrogeomorphological a proposed mapping is designed to survey watershed studying the evolution of longitudinal river profiles, profiles morphogeologicals, tectonic structures and chemical-mineralogical composition of rock units associated with morphological partitioning of relief. All based on the method chosen. This certainly seems like an obvious thing, however, highlights the work of a true system of river dissection, associated with the lowering of baseline levels (knickzones) that evolve according to the metamorphic foliation dipping flanks of the folds and the damage zone associated with the fault. The conclusion reached is that the relief Benevente River basin, and in turn the mountainous region of the state, appears as residual geomorphic compartments resulting from the evolution of river knickzonas associated with the organization of tectonic folds background responsible for the genesis of differential levels of lithologic resistance and spatial distribution of faults and fractures. The composition of the lithological units also influences strongly the partitioning of relief, being the level of reliefs and round dissecting the strong dependence of the degree of participation of the group of the minerals plagioclase amphibole and pyroxene in the lithological constitution of lithostructurals (AU)

FAPESP's process: 10/10066-0 - The role of structures Proterozoic in the evolution of the hydrographic network in the Mountain Region of the Espírito Santo: the case of river basin Benevente.
Grantee:Roberto José Hezer Moreira Vervloet
Support type: Scholarships in Brazil - Doctorate