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Title: Uso de lidar aerotransportado para mapeamento e análise estrutural de depósitos ferríferos na serra sul de Carajás, Amazônia
metadata.dc.creator: COSTA, Francisco Ribeiro da
metadata.dc.contributor.advisor1: SOUZA FILHO, Pedro Walfir Martins e
Keywords: Sensoriamento remoto - Carajás, Serra dos (PA)
Radar óptico - Carajás, Serra dos (PA)
Issue Date: 29-Mar-2018
Publisher: Universidade Federal do Pará
Citation: COSTA, Francisco Ribeiro da. Uso de lidar aerotransportado para mapeamento e análise estrutural de depósitos ferríferos na Serra Sul de Carajás, Amazônia. Orientador: Pedro Walfir Martins e Souza Filho. 2018. 88 f. Tese (Doutorado em Geologia e Geoquímica) - Instituto de Geociências, Universidade Federal do Pará, Belém, 2018. Disponível em: Acesso em:.
Abstract: This research is focused on the definition of methods for the use of Light Detection And Range - LiDAR data in structural geological mapping. In the Amazon Region, in particular in the banded iron formations of the Mineral Province of Carajás - PMC, the vegetal cover compromises the extraction of structural information from optical remote sensing data, since it masks the geomorphological and structural features that can correspond the geological structures . This thesis addressed the application of digital image processing techniques of LiDAR data, from i) shaded relief model - MRS do, which used a configuration with eight lighting modes with different views ranging from 45º between them, to generation of alignment maps; and ii) laplacian filtration in shaded relief model - FLMRS in multidirectional visions. In both resulting maps the same structural trends, NE-SW, NW-SE and secondarily N-S and E-W were observed. However, the map generated from the FLMRS in multidirectional visions presented a better geometry of the spatial distribution of the lineaments. The results obtained from the analysis of LiDAR data were compared with structural data collected and analyzed from the study of iron ore deformation and associated volcanic rocks at the Serra Sul de Carajás mine - S11D. The structural analysis showed a single episode reflecting shortening in the E-W direction, with the installation of two fault systems, one NE-SW direction and the new NW-SE direction. This deformation is responsible for the geometry of the rocks of the S11D plateau, forming a sinformal / antiformal sequence with NE and SE trim along with these fault systems and with axial planes dipping at high angles to NW and NE forming folds with complex interference patterns. Lamination in iron ore still preserves primary structures and there is no evidence of pervasive milonization in these rocks. It proposes a deformational model for the rocks of the S11D Plateau related to transpression controlled by the Carajás Fault during regional sinistral movements. The comparative analysis of the structural maps generated with airborne LiDAR data and traditional manual methods were performed from the comparative of the two maps. The calculation and quantification of the dispersion of the structural contour lines in each area from the different methods showed a correlation coefficient that varied between 0.91 and 0.93, suggesting a good degree of similarity between the mapped structures, although there are variations in the orientation and abundance in the structural contour lines. In general, the results demonstrate the effectiveness of the airborne LiDAR data to extract detailed and accurate structural information on tropical terrain and can be used to complement the fieldbased structural mapping.
Appears in Collections:Teses em Geologia e Geoquímica (Doutorado) - PPGG/IG

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