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Previous issue date: 2017-08-28 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Uma pesquisa geomorfol?gica detalhada usando Light Detection and Ranging
(LIDAR) foi realizada ao longo da parte ocidental do rio Assu, estado do Rio Grande do
Norte, Brasil. O estudo foi complementado por uma s?rie de sondagens com trado,
indicadores de foramin?feros bent?nicos de sedimentos, bem como data??o por Optically
Stimulated Luminescence (OSL) e por Radiocarbono (C14). Esses dados permitiram
reconstruir a evolu??o desta ?rea desde o Pleistoceno tardio at? o presente. O ba?a rasa, que
agora est? completamente preenchido formado dentro dos limites da morfologia antecedente
desenvolvida desde a ?ltima interglacial. Os principais fatores for?adores respons?veis pelo
reposicionamento do litoral, que correu em um ?ngulo de ca. 35% para a costa atual no Pre
Holoceno e M?dio Holoceno foram: (1) atividade tect?nica ao longo da linha de falha de
Afonso Bezerra, define a estrutura de horst-graben da Serra do Mel, (2) inunda??o r?pida da
ba?a do paleovale raso durante a ?ltimo pulso da transgress?o do Holoceno ca. 7500 cal BP e
(3) prograda??o r?pida do estu?rio do rio Assu atrav?s da acumula??o de sedimentos costeiros
e sedimentos fluviais. / A detailed geomorphological survey using Light Detection and Ranging was carried
out along the western part of Assu River, NE, Brazil. The study was complemented by a series
of shallow boreholes, sediment benthic foraminifera indicators, as well as radiocarbon and
optically stimulated luminescence dating and permitted to reconstruct the evolution of this
area from the late Pleistocene until the present. The shallow embayment, which is now
completely infilled formed within the limits of antecedent morphology developed since the
last interglacial. The main forcing factors responsible for repositioning of the shoreline, which
ran at an angle of ca. 35% to the present coast in Early/mid Holocene were: (1) tectonic
activity along Afonso Bezerra a strike-slip fault line which defines the horst-graben structure
of Mel dome, (2) fast inundation of the shallow paleovalley embayment during the last pulse
of Holocene transgression ca. 7500 cal BP, and (3) fast progradation of the Assu estuary
through accretion of coastal drift and fluvial sediments.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/24508 |
| Date | 28 August 2017 |
| Creators | Barbosa, Maria Emanuella Firmino |
| Contributors | 37923579415, Vital, Helenice, 31481981404, Lima, Carlos C?sar Uch?a de, 33251665553, Borges, S?rgio Vieira Freire, 65437640404, Silva Filho, Wellington Ferreira da, 36720402315, Bezerra, Francisco Hilario Rego |
| Publisher | 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/doctoralThesis |
| 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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