2014-08-222014-08-221991-11-25PORSANI, Jorge Luís. Estudo da estrutura geo-elétrica da Região do Juruá, AM, pelo método magnetotelúrico. 1991. 104 f. Dissertação (Mestrado) - Universidade Federal do Pará, Centro de Geociências, Belém, 1991. Curso de Pós-Graduação em Geofísica.https://repositorio.ufpa.br/handle/2011/5484A clear geoelectric picture from the Juruá region in the Solimões Basin was obtained using magnetotelluric (MT) data. Field data were recorded along three profiles of 15 km long, spaced 3.5 km, covering 100 km2. The spacing between each of the 35 stations was irregular, ranging from 400 m to 3500 m. The frequency range was 0.001 Hz to 300 Hz. This allows investigation depths of 100 m down to 60 km. The data were affected by the so called static effect. To correct that effect the median of the resistivity of the first conductor which corresponds to the Solimões Formation was used. The invariant of the MT tensor was used to interpret the Juruá geoelectric structure. The results are presented in the form of geoelectric sections. The geoelectric sections were obtained using both the Bostick transformation and the 1D Occam inversion at each station. It was possible to identify a sequence of conductive and resistive layers corresponding to the sedimentary sequence, a fault zone and the geoelectric basement characterizing the Solimões Basin. Below the geoelectric basement a conductive zone was also identified, followed by a Low Conductive Layer at depths of 20 km or more. This layer is interpreted as being composed of gabbro, which is associated to processes of vertical accretion, which in turn are linked to both crustal stabilization and lithosphere thickening. The results show a good agreement with resistivity well logs and surface seismic data.porAcesso AbertoMétodo magnetotelúricoAmazonas - EstadoRio Solimões (Bacia do Amazonas)Amazônia brasileiraProspecção - Métodos geofísicosRochasDissertaçãoCNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOFISICA::GEOFISICA APLICADACNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA::PROSPECCAO MINERAL