Geomorfologia e Controle Estrutural de Diques na Região Centro-Norte do Estado do Paraná (Geomorphology and Structural Dikes Control at the Central North Region of the State of Paraná)

Resumo

Padrões de drenagem específicos foram encontrados na área de estudo, situada na região centro-norte do Estado do Paraná. Os de tipo semi-retangular e retangular foram estabelecidos pela presença de falhas preenchidas por diques em geral (com direção aproximada de N50ºW). Os padrões de tipo subparalelos e paralelos foram estabelecidos pela existência de fraturas comumente de direção norte. A base metodológica do trabalho ficou centrada em levantamento bibliográfico, cartográfico, e nos produtos do sensoriamento remoto. Foram utilizadas: quatro cartas topográficas do IBGE na escala 1:100.000, necessárias para o recobrimento da área de estudo, carta geológica do Paraná (Mineropar, 2006) na escala 1:650.000, e dados SRTM (Shuttle Radar Topography Mission), organizado pela NASA (2000), obtidos no site da EMBRAPA (2005), que permitiram a elaboração da carta hipsométrica. Constatou-se que a drenagem da área de estudo, é fortemente influenciada por diques de diabásio, entre outros lineamentos estruturais.

A B S T R A C T

This work targets to continue the existing researches about the geology and geomorphology of the contact between the second and third paranaense plateau. The objectives of this research was to recognize and plot the diabase dikes, identify others structural lineaments of the study area formulate the area’s drainage map and associate the drainage arrangement with the lineaments found. Specific drainage systems patterns were found in the study area, situated in the central north region of the State of Paraná. Those with the semi-rectangular and rectangular forms were determined by the presence of faults filled with dikes in general (with approximated direction of N50ºW). The subparallel and parallel patterns were determined through the existence of fractures commonly directed north. The works methodological base was centered on bibliographic and particularly cartographic surveys. In this case, it was used: four topographic maps from IBGE in the scale 1:100.000 to cover the study area, a geologic map of Paraná (Mineropar, 2006) in the scale 1:650.000, and SRTM(Shuttle Radar Topography Mission) data arranged by NASA(2000), obtained at Miranda (2005), allowing the elaboration of the  hypsometric map. It was stablished that the drainage of the study area is strongly affected by the diabase dikes, and other structural lineaments.

Keywords: dikes, drainage, structural lineaments, central north, Paraná.