Neotectonics in Marajó Island, State of Pará (Brazil) revealed by vertical electric sounding integrated with remote sensing and geological data
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Academia Brasileira de Ciências
2013
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| author | LENA S.B. SOUZA |
| author_facet | LENA S.B. SOUZA |
| contents | Neotectonics in Marajó Island, State of Pará (Brazil) revealed by vertical electric sounding integrated with remote sensing and geological data LENA S.B. SOUZA DILCE F. ROSSETTI VAGNER R. ELIAS RENATO L. PRADO Multidisciplinaria (Ciencias Naturales y Exactas) faults Quaternary Marajó Island remote sensing Vertical electric sounding 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 14 C, 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. 2013 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32725624006 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.1 Vol.85 |
| format | Artículo científico |
| id | redalyc_32725624006 |
| institution | Redalyc |
| language | en |
| publishDate | 2013 |
| publisher | Academia Brasileira de Ciências |
| spellingShingle | Neotectonics in Marajó Island, State of Pará (Brazil) revealed by vertical electric sounding integrated with remote sensing and geological data LENA S.B. SOUZA Multidisciplinaria (Ciencias Naturales y Exactas) faults Quaternary Marajó Island remote sensing Vertical electric sounding Neotectonics in Marajó Island, State of Pará (Brazil) revealed by vertical electric sounding integrated with remote sensing and geological data LENA S.B. SOUZA DILCE F. ROSSETTI VAGNER R. ELIAS RENATO L. PRADO Multidisciplinaria (Ciencias Naturales y Exactas) faults Quaternary Marajó Island remote sensing Vertical electric sounding 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 14 C, 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. 2013 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32725624006 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.1 Vol.85 |
| title | Neotectonics in Marajó Island, State of Pará (Brazil) revealed by vertical electric sounding integrated with remote sensing and geological data |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) faults Quaternary Marajó Island remote sensing Vertical electric sounding |
| url | https://www.redalyc.org/articulo.oa?id=32725624006 |