%0 Journal Article
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%X Marajó Island is located in a passive continental margin that evolved from rifting associated with the opening of the Equatorial South Atlantic Ocean in the Late Jurassic/Early Cretaceous period. This study, based on remote sensing integrated with sedimentology, as well as subsurface and seismographic data available from the literature, allows discussion of the significance of tectonics during the Quaternary history of marginal basins. Results show that eastern Marajó Island contains channels with evidence of tectonic control. Mapping of straight channels defined four main groups of lineaments (i.e. NNESSW, NESW, NWSE and EW) that parallel main normal and strike-slip fault zones recorded for the Amazon region. Additionally, sedimentological studies of late Quaternary and Holocene deposits indicate numerous ductile and brittle structures within stratigraphic horizons bounded by undeformed strata, related to seismogenic deformation during or shortly after sediment deposition. This conclusion is consistent with subsurface Bouguer mapping suggestive of eastern Marajó Island being still part of the Marajó graben system, where important fault reactivation is recorded up to the Quaternary. Together with the recognition of several phases of fault reactivation, these data suggest that faults developed in association with rift basins might remain active in passive margins, imposing important control on development of depositional systems.
%8 Feb.
%N 2
%T Quaternary tectonics in a passive margin: Marajó Island, northern Brazil. JQS
%@secondarytype PRE PI
%K tectonics, Quaternary, Marajo´ Island, sedimentary structure, soft sediment deformation, spatial analysis.
%@usergroup administrator
%@usergroup banon
%@usergroup marciana
%@group
%@group DSR-INPE-MCT-BR
%@group DSR-INPE-MCT-BR
%@secondarykey INPE--PRE/
%@issn 0267-8179
%2 sid.inpe.br/mtc-m17@80/2007/12.21.15.33.57
%@affiliation Univ Sao Paulo, Inst Geosci
%B Journal of Quaternary Science
%@versiontype publisher
%P 121–135
%4 sid.inpe.br/mtc-m17@80/2007/12.21.15.33
%@documentstage not transferred
%D 2007
%V 23
%@doi 10.1002/jqs.1132
%A Goes, Ana Maria,
%A Rossetti, Dilce F.,
%A Valeriano, Márcio de Morisson,
%A Miranda, A. C. da C,
%@dissemination WEBSCI; PORTALCAPES.
%@area SRE