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Quaternary evolution of the Caravelas strandplain - Southern Bahia State - Brazil Anais da ABC (AABC)
Andrade,Ana C.S.; Dominguez,José M.L.; Martin,Louis; Bittencourt,Abílio C.S.P..
An evolutionary model is proposed for the Caravelas strandplain. The model encompasses integration of: (i) mapping of Quaternary deposits, (ii) cartography of beach-ridge alignments and their truncations, (iii) relative sea-level history, (iv) development history of the Abrolhos coral reefs, (v) vibra-coring and (vi) C14 dating of Quaternary deposits. Seven major evolutionary stages were identified. These stages show that the strandplain has had its Quaternary evolution strongly controlled by relative sea-level changes. In addition, the development of the Abrolhos coral reefs has also played an important role in dispersion and accumulation of sediments along the coastline, causing localized inversion in longshore sediment transport.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coastal evolution; Sea-level fluctuations; Sedimentary facies; Geomorphology.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000300008
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Sea-level fluctuations and coastal evolution in the state of Rio de Janeiro, southeastern Brazil Anais da ABC (AABC)
CASTRO,JOÃO WAGNER A.; SUGUIO,KENITIRO; SEOANE,JOSÉ C.S.; CUNHA,ALINE M. DA; DIAS,FABIO F..
The present paper aims to investigate the relative sea-level and the coastal evolution during the Holocene in the Rio de Janeiro coastline, based on geological and biological indicators. Using topographic survey, excavation and coring, and 14C dating of these coastal deposits and beachrocks outcrops, we have reconstructed a sea-level curve for the Holocene. For the first time on the Brazilian coast it was identified a negative record of relative sea-level during Late Pleistocene and Early Holocene transition. After the transition, a relatively rapid increase of sea-level began. At approximately at 8500 cal yr BP, the sea-level was 0.5 m below the current level, was overtaken for the first time in the Holocene, at approximately 7500 cal yr BP. The maximum...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sea-level fluctuations; Coastal evolution; Holocene; Brazilian coast.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200671
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