English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

. The geoelectrical survey was conducted in a portion of the northern edge of the Amazon Sedimentary Basin, between the kilometer 38 and the kilometer 96 of the BR-174 highway, dominated by sediments of the Alter do Chao Formation. We performed eight vertical electrical soundings (Schlumberger) and an electrical imaging section (dipole-dipole), using a portable resistivity (Syscal R2). The field data were processed using IPI2Win and RES2DINV softwares, resulting in the development of profiles and sections of electrical resistivity, which allowed the identification of lithologies and structures (faults) that affected this lithostratigraphic unit, as well as their contact relations with the rocks of the Manacapuru Formation, in this portion of land. In the Alter do Chao Formation, the highest resistivities are related to weathered materials of the superficial layers and sandstone in the deeper strata, which appear interspersed with thin layers of pelitic material. The results of electrical imaging performed in the portion of the northern boundary of Alter do Ch˜ao Formation, show the horizontal behavior of strata, highlights geological features (faults) and the south slope of its substrate, towards the center of the basin. Keywords : geological features, lithology, electrical resistivity. RESUMO. O levantamento geoeletrico foi realizado em uma porcao da borda norte da Bacia Sedimentar do Amazonas, entre os quilometros 38 e 96 da rodovia BR-174, onde predominam exposicoes sedimentares da Formacao Alter do Chao. Foram realizadas oito sondagens eletricas verticais (Schlumberger) e uma secao de imageamento eletrico (Dipolo-dipolo), por meio de um resistivimetro portatil (Syscal R2). Os dados de campo foram processados por meio dos softwares IPI2Win e RES2DINV, que resultaram na elaboracao de perfis e secoes de resistividade eletrica, o que permitiu a identificacao de litologias e estruturas (falhas) que afetaram as rochas dessa unidade litoestratigrafica, assim como suas relacoes de contato com as rochas da Formacao Manacapuru, nessa porcao territorial. No âmbito da Formacao Alter do Chao, as resistividades mais elevadas estao relacionadas com materiais de alteracao, nas camadas mais superficiais, e a estratos arenosos mais profundos, os quais aparecem intercalados com finas camadas de material pelitico. Os resultados do imageamento eletrico, realizado na porcao do limite norte da Formacao Alter do Chao, mostram o comportamento horizontal dos estratos, e destacam feicoes geologicas (falhas) e a declividade para sul do seu substrato, no sentido para o depocentro da bacia. Palavras-chave : feicoes geologicas, litologias, resistividade eletrica.

STRATIGRAPHIC ASPECTS OF THE ALTER DO CHÃO FORMATION IN THE NORTHERN REGION OF MANAUS, BASED ON GEOELECTRIC INFORMATION