Carbonate-siliciclastic sedimentation on a high-energy, oceanfacing, tropical ramp, NE Brazil

Detalhes bibliográficos
Autor(a) principal: Testa, Viviane
Data de Publicação: 1998
Outros Autores: Bosence, Daniel W. J.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://repositorio.ufba.br/ri/handle/ri/13823
Resumo: p. 55-71
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spelling Testa, VivianeBosence, Daniel W. J.Testa, VivianeBosence, Daniel W. J.2013-11-20T19:44:55Z2013-11-20T19:44:55Z1998http://repositorio.ufba.br/ri/handle/ri/13823v. 149p. 55-71The inner portion of the continental shelf of Rio Grande do Norte State, Brazil has been investigated by Landsat-TM imagery and by scuba diving. The area experiences high-energy, shoreline and shelf-margin parallel currents driven by a combination of oceanic, tidal and wave processes. The high meso-tidal range (<4 m) further distributes the high-energy waters over the entire inner shelf region (0-25 m). This shelf is a high-energy, distally steepened ramp in which the distribution of carbonate and siliciclastic facies belts is controlled by the energy of the environment, the sources of siliciclastic sediment and the Quaternary history of the area. Carbonate sediments are generated throughout the sublittoral zone and are dominated by calcareous red and green algae. SmalL, low-diversity coral patch reefs occur in shallow areas. Quartz-rich sands form beaches and subaerial longitudinal dunes, and an offshore, submarine, sandstone outcrop interpreted as a former Quaternary shoreline. This sandstone has been eroded during the Holocene transgression to generate quartz sands deposited in a train of transverse dunes migrating parallel to the coast. Longitudinal sand ribbons comprising bioclastic gravelly sands attest to high-energy, shore-parallel currents in the inner shelf. Branching coralline algae (maErl) form stabilized sea-floor areas. Preliminary 14C dating indicates a Pleistocene highstand period when coarse algal sands accumulated. Holocene lowstand conditions spread quartz-rich sands over the inner ramp area, which were reworked during the Holocene transgression. Present-day erosion, transport and in situ carbonate production results in mixing of these earlier carbonate and siliciclastic units. The Brazilian ramp has similar, but narrower morphology, when compared with the distally steepened ramps of the Yucatan and west Florida. All three ramps are swept by coastline-parallel currents. In Brazil, the higherenergy, windward-facing, inner ramp has calcareous algal sands and patch reefs compared with the inner ramps of the leeward-facing Gulf of Mexico examples that accumulate molluscan sands. Outer ramp facies in each example are planktonic foraminiferal oozes.Submitted by Santiago Fabio (fabio.ssantiago@hotmail.com) on 2013-08-19T17:07:12Z No. of bitstreams: 1 1111111111aas.pdf: 3418863 bytes, checksum: 67ae7fd9f6709f30736bf91fa0e30631 (MD5)Approved for entry into archive by Rodrigo Meirelles (rodrigomei@ufba.br) on 2013-11-20T19:44:55Z (GMT) No. of bitstreams: 1 1111111111aas.pdf: 3418863 bytes, checksum: 67ae7fd9f6709f30736bf91fa0e30631 (MD5)Made available in DSpace on 2013-11-20T19:44:55Z (GMT). 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dc.title.pt_BR.fl_str_mv Carbonate-siliciclastic sedimentation on a high-energy, oceanfacing, tropical ramp, NE Brazil
dc.title.alternative.pt_BR.fl_str_mv The Geological Society
title Carbonate-siliciclastic sedimentation on a high-energy, oceanfacing, tropical ramp, NE Brazil
spellingShingle Carbonate-siliciclastic sedimentation on a high-energy, oceanfacing, tropical ramp, NE Brazil
Testa, Viviane
title_short Carbonate-siliciclastic sedimentation on a high-energy, oceanfacing, tropical ramp, NE Brazil
title_full Carbonate-siliciclastic sedimentation on a high-energy, oceanfacing, tropical ramp, NE Brazil
title_fullStr Carbonate-siliciclastic sedimentation on a high-energy, oceanfacing, tropical ramp, NE Brazil
title_full_unstemmed Carbonate-siliciclastic sedimentation on a high-energy, oceanfacing, tropical ramp, NE Brazil
title_sort Carbonate-siliciclastic sedimentation on a high-energy, oceanfacing, tropical ramp, NE Brazil
author Testa, Viviane
author_facet Testa, Viviane
Bosence, Daniel W. J.
author_role author
author2 Bosence, Daniel W. J.
author2_role author
dc.contributor.author.fl_str_mv Testa, Viviane
Bosence, Daniel W. J.
Testa, Viviane
Bosence, Daniel W. J.
description p. 55-71
publishDate 1998
dc.date.issued.fl_str_mv 1998
dc.date.accessioned.fl_str_mv 2013-11-20T19:44:55Z
dc.date.available.fl_str_mv 2013-11-20T19:44:55Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://repositorio.ufba.br/ri/handle/ri/13823
dc.identifier.number.pt_BR.fl_str_mv v. 149
url http://repositorio.ufba.br/ri/handle/ri/13823
identifier_str_mv v. 149
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv The Geological Society
publisher.none.fl_str_mv The Geological Society
dc.source.pt_BR.fl_str_mv 10.1144/GSL.SP.1999.149.01.05
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFBA
instname:Universidade Federal da Bahia (UFBA)
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collection Repositório Institucional da UFBA
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