Ensaios geoquímicos e geoambientais como subsídio à interpretação das unidades de relevo em litologias do embasamento cristalino / Geochemical and geo-environmental testing as subsidy to interpretation of the relief units in the crystalline basement lithologies

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

17/12/2009

RESUMO

A significant evolution of knowledge on geosciences and its related topics can be observed nowadays. It happens, in particular, with the geomorphologic science, which has, as its premise, to understand and to explain the current relief architecture form based on its genesis, chronological evolution and stabilization degree having, as starting point, descriptive and investigative studies. Such developments are supported by new geotechnologies and, consequently, by the application of specific methodologies that allow a broad possibility of new indicative or elucidative propositions about the geomorphologic system. Therefore, the objective of this work is to verify the possible influence of geochemical aspects on the current relief units’ state related to geoenvironmental elements, in different lithologies through the application of methodological procedures involving the application of geotechnologies and geochemical research. In order to successfully accomplish this methodological proposal the higher third mean of the “Pequeno” river watershed was defined as the area of study. This area is located in São José dos Pinhais municipality in the Curitiba metropolitan area, in Paraná state, in south region of Brazil. Such special cut was adopted because of the suitability of its geoenvironmental characteristics to the right and proper execution of this work. The adopted methodological procedures consist in the use of the analysis of products prepared based on remote sensing techniques and geoprocessing in order to produce the thematic cartography. Such products are associated to the geochemical research of the alteration material (saprólito) in the crystalline basement rocks, having as object of interest opposed strands in two distinct sample areas. When concerning the geochemical study, the oxide semi-quantitative scan method using x-ray fluorescent spectrometry was adopted. It was performed in intermediate material samples between the geochemical orientated and lithogeochemical orientated soil studies. Considering the methodological essays proposed in this work, the obtained results are satisfactory. It is important, however, to perform more detailed studies with more analysis with the purpose of having more confidence regarding the geochemical relations with the interpretation and understanding of the current relief forms. Nevertheless, it is important to stress the importance of these results, not as clarifying answers, but as another feasible possibility to understand the geomorphologic system regarding its genesis, evolution and stability degree.

ASSUNTO(S)

bacia hidrográfica crystalline basement embasamento cristalino geochemical study geotechnologies geotecnologias investigações geoquímicas relief units unidades de relevo watershed

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