Abstract
The objective of this article is to characterize the main directions of structures of the Parana Basin, to define the relation of deep structures (magnetic lineaments) with superficial structures [lineaments obtained over Shuttle Radar Topography Mission (SRTM) images] and analyse reactivated structures in the Phanerozoic. The magnetic lineaments at the Eastern edge of the Parana Basin, in the central-southern region of the Santa Catarina State, show a main orientation pattern NE-SW and secondarily NNE-SSW. The NE-SW pattern reflects a framework of the ductile structures of the Santa Catarina Shield that continues in the substratum of the basin. The structural NNE pattern appears in the south of the Major Gercino Shear Zone (MGSZ) and the NE pattern appears in the north of this structure. The data obtained shows that the structural NE-SW pattern of the basin, present in the MGSZ and Itajai-Perimbo Shear Zone as well as in the Tijucas Terrain (Brusque Metamorphic Complex) in Santa Catarina, clearly extends underneath the Gondwanic sequence of the Parana Basin in the region. Among the products obtained by geophysical data processing in this work, what propitiated the best definition and distinction of the magnetic structures was the tilt angle of the total horizontal gradient (TAHG) method. However, the great flight line spacing of one of the geophysical projects (7 km) makes the identification of small magnetic structures difficult, particularly in N-S and E-W directions. Such structural directions are referred to in the previous works and were confirmed through the interpretation of SRTM images and studies of brittle structures in the field.
Highlights
The geophysical methods are indirect investigation techniques that allow the evaluation of geological conditions through the contrast of the physical characteristics of the materials
The total horizontal gradient (TAHG) map was the main product used for the interpretation of the magnetic lineaments (Fig. 6E)
Structures close to N-S are concentrated in the Santa Catarina Shield, occurring mainly in the south of the Major Gercino Shear Zone (MGSZ)
Summary
The geophysical methods are indirect investigation techniques that allow the evaluation of geological conditions through the contrast of the physical characteristics of the materials. The analysis of such data provides the delineation of the main structural features, from regional to a more detailed scale, and may allow the delimitation of the different lithotypes, supplying subsidies for the geological cartography (Vasconcellos et al 1994). The specific objectives distinguished are to: (1) characterize the main directions of structures of the Paraná Basin in the study area; (2) define the relation of the magnetic lineaments (deep structures) with features obtained through images of remote sensing in a 1:500,000 scale (superficial structures); and (3) verify the reactivated structures in the basin that affected the sedimentary rocks of the Paraná Basin
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