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Provedor de dados:  Anais da ABC (AABC)
País:  Brazil
Título:  Neotectonics in Marajó Island, State of Pará (Brazil) revealed by vertical electric sounding integrated with remote sensing and geological data
Autores:  SOUZA,LENA S.B.
ROSSETTI,DILCE F.
ELIAS,VAGNER R.
PRADO,RENATO L.
Data:  2013-03-01
Ano:  2013
Palavras-chave:  Vertical electric sounding
Faults
Quaternary
Marajó Island
Remote sensing
Resumo:  Studies suggest that the Marajó Island has experienced neotectonic activity during its latest evolution. However, there are no data demonstrating the presence of tectonic structures in its shallow subsurface. This work integrates vertical electric sounding, morphostructural lineaments, and geological data aiming to show fault control on the Late Pleistocene-Holocene sedimentation of this area. Resistivity values were related to mud (< 90 Ωm), clayey sand (90 and 200 Ωm), sand (200 and 500 Ωm), as well as Fe-bearing sand and laterite (> 500 Ωm). The latest values were related to the unconformity with lateritic paleosol at the top of the Barreiras Formation. Despite the values ≤ 500 Ωm of both the Barreiras Formation and the Late Pleistocene-Holocene unit, the latter was distinguished along four electric sections due to the presence of this unconformity, combined with the integration of available 14C, and luminescence ages of Quaternary sediments. The electric sections recorded several places with lateral interruptions of resistivity values within short distances, which were related to faults. The Miocene strata were vertically displaced by normal faults, giving rise to new accommodation space where Late Pleistocene-Holocene sediments were deposited. Fault reactivation was crucial to renew sedimentation in eastern Marajó Island during its latest evolutionary stage.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100073
Editor:  Academia Brasileira de Ciências
Relação:  10.1590/S0001-37652013000100006
Formato:  text/html
Fonte:  Anais da Academia Brasileira de Ciências v.85 n.1 2013
Direitos:  info:eu-repo/semantics/openAccess
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