Indicadores do nível relativo do mar e evolução costeira durante o holoceno tardio no litoral oeste do Ceará, NE do Brasil
In the coastal region of Ceará, between the municipalities of Acaraú 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 b...
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| Formato: | Dissertação |
| Idioma: | por |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/19839 |
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| Resumo: | In the coastal region of Ceará, between the municipalities of Acaraú 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 Ceará present differently from other curves constructed in the
coastal northeast, suggesting that local factors mentioned above contributed to sea level
fluctuations. |
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