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Previous issue date: 2014-02-26 / Na regi?o litor?nea do Cear?, entre os munic?pios de Acara? e Itapipoca, foram
identificados treze s?tios contendo indicadores do n?vel relativo do mar, sendo seis
destes datados por luminesc?ncia opticamente estimulada (LOE) e radiocarbono. As
idades obtidas suportam que foram formadas praias progradantes na ?rea de estudo. Na
parte oriental, ocorrem praias em dep?sitos de plan?cie costeira, enquanto que um
sistema laguna/barreira com paleomanguezais ocorre na parte ocidental da ?rea de
estudo. Em ambos os casos os dep?sitos costeiros progradam de leste para oeste. Foram
identificados n?veis de mar mais alto que o atual entre: (a) 3.110-2.830 anos cal. AP; (b)
1.830 anos AP (LOE) - 1.490 anos cal. AP; (c) entre 1.240-1.060 anos cal. AP; (d) 845-
715 anos AP (LOE). Desde ent?o o n?vel do mar sofreu um abaixamento at? o n?vel
atual. As varia??es do n?vel do mar s?o interpretadas como respostas a altera??es no
padr?o de circula??o marinha e n?o exclu?mos poss?veis perturba??es tect?nicas na
bacia da margem continental. Os indicadores do n?vel relativo do mar para litoral oeste
do Cear? apresentam-se diferente das outras curvas constru?das no litoral do nordeste,
sugerindo que os fatores locais citados acima contribu?ram para flutua??es do n?vel do
mar. / In the coastal region of Cear?, between the municipalities of Acara? and Itapipoca,
thirteen sites were identified containing indicators of relative sea level, six of these
being dated by optically stimulated luminescence (OSL) and radiocarbon. Ages
obtained supports that were formed prograding beaches in the study area. In the eastern
portion, beaches in coastal plain deposits occur while a system lagoon/barrier
paleomangrove occurs in the western portion of the study area. In both cases the coastal
deposits prograde from east to west. Higher sea levels were identified between the
current: (a) 3.110-2.830 cal. yr. BP; (b) 1.830 yr. BP (OSL) - 1.490 cal. yr. BP; (c)
between 1.240-1.060 cal. yr. BP; (d) 845-715 yr. BP (OSL). Since then the sea level
suffered by lowering the current level. Variations in sea level are interpreted as
responses to changes in the pattern of marine circulation and do not exclude possible
tectonic disturbances in the basin of the continental margin. The indicators of relative
sea level west coast of Cear? present differently from other curves constructed in the
coastal northeast, suggesting that local factors mentioned above contributed to sea level
fluctuations.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/19839 |
| Date | 26 February 2014 |
| Creators | Vasconcelos, David Lino |
| Contributors | 37923579415, http://lattes.cnpq.br/6050302316049061, Amaral, Ricardo Farias do, 12714585434, http://lattes.cnpq.br/5120081491389865, Diniz, Ronaldo Fernandes, 20080352472, http://lattes.cnpq.br/6988156791576253, Bezerra, Francisco Hil?rio Rego |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM GEODIN?MICA E GEOF?SICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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