Modern sedimentary processes along the Doce river adjacent continental shelf
In areas of the continental shelf where sediment supply is greater than the sediment dispersion capacity, an extensive terrigenous deposits and consequently submerged deltas can be formed. The Eastern Brazilian shelf is characterized by the occurrence of river feed deltas in between starving coasts....
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Geologia
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| Series: | Brazilian Journal of Geology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892015000500635&lng=en&tlng=en |
| _version_ | 1818056980613300224 |
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| author | Valéria da Silva Quaresma Geórgia Catabriga Silvia Nossa Bourguignon Estefânia Godinho Alex Cardoso Bastos |
| author_facet | Valéria da Silva Quaresma Geórgia Catabriga Silvia Nossa Bourguignon Estefânia Godinho Alex Cardoso Bastos |
| author_sort | Valéria da Silva Quaresma |
| collection | DOAJ |
| description | In areas of the continental shelf where sediment supply is greater than the sediment dispersion capacity, an extensive terrigenous deposits and consequently submerged deltas can be formed. The Eastern Brazilian shelf is characterized by the occurrence of river feed deltas in between starving coasts. Herein, modern sedimentary processes acting along the Doce river adjacent continental shelf are investigated. The main objective was to understand the shelf sediment distribution, recognizing distinct sedimentary patterns and the major influence of river sediment discharge in the formation of shelf deposits. The study used 98 surficial samples that were analyzed for grain size, composition and bulk density. Results revealed 3 distinct sectors: south - dominated by mud fraction with a recent deposition from riverine input until 30 m deep and from this depth bioclastic sands dominate; central north - sand mud dominated, been recognized as a bypass zone of resuspended sediment during high energy events; and north - relict sands with high carbonate content. The modern sedimentation processes along the Doce river continental shelf is dominated by distinct sedimentary regimes, showing a strong fluvial influence associated with wave/wind induced sediment dispersion and a carbonate regime along the outer shelf. These regimes seem to be controlled by the distance from the river mouth and bathymetric gradients. |
| first_indexed | 2024-12-10T12:37:28Z |
| format | Article |
| id | doaj.art-467b84aba1744d94a51f37ee2a877606 |
| institution | Directory Open Access Journal |
| issn | 2317-4692 |
| language | English |
| last_indexed | 2024-12-10T12:37:28Z |
| publisher | Sociedade Brasileira de Geologia |
| record_format | Article |
| series | Brazilian Journal of Geology |
| spelling | doaj.art-467b84aba1744d94a51f37ee2a8776062022-12-22T01:48:36ZengSociedade Brasileira de GeologiaBrazilian Journal of Geology2317-469245463564410.1590/2317-488920150030274S2317-48892015000500635Modern sedimentary processes along the Doce river adjacent continental shelfValéria da Silva QuaresmaGeórgia CatabrigaSilvia Nossa BourguignonEstefânia GodinhoAlex Cardoso BastosIn areas of the continental shelf where sediment supply is greater than the sediment dispersion capacity, an extensive terrigenous deposits and consequently submerged deltas can be formed. The Eastern Brazilian shelf is characterized by the occurrence of river feed deltas in between starving coasts. Herein, modern sedimentary processes acting along the Doce river adjacent continental shelf are investigated. The main objective was to understand the shelf sediment distribution, recognizing distinct sedimentary patterns and the major influence of river sediment discharge in the formation of shelf deposits. The study used 98 surficial samples that were analyzed for grain size, composition and bulk density. Results revealed 3 distinct sectors: south - dominated by mud fraction with a recent deposition from riverine input until 30 m deep and from this depth bioclastic sands dominate; central north - sand mud dominated, been recognized as a bypass zone of resuspended sediment during high energy events; and north - relict sands with high carbonate content. The modern sedimentation processes along the Doce river continental shelf is dominated by distinct sedimentary regimes, showing a strong fluvial influence associated with wave/wind induced sediment dispersion and a carbonate regime along the outer shelf. These regimes seem to be controlled by the distance from the river mouth and bathymetric gradients.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892015000500635&lng=en&tlng=enDelta costeiroSedimento dinâmicoRio DocePlataforma continental |
| spellingShingle | Valéria da Silva Quaresma Geórgia Catabriga Silvia Nossa Bourguignon Estefânia Godinho Alex Cardoso Bastos Modern sedimentary processes along the Doce river adjacent continental shelf Brazilian Journal of Geology Delta costeiro Sedimento dinâmico Rio Doce Plataforma continental |
| title | Modern sedimentary processes along the Doce river adjacent continental shelf |
| title_full | Modern sedimentary processes along the Doce river adjacent continental shelf |
| title_fullStr | Modern sedimentary processes along the Doce river adjacent continental shelf |
| title_full_unstemmed | Modern sedimentary processes along the Doce river adjacent continental shelf |
| title_short | Modern sedimentary processes along the Doce river adjacent continental shelf |
| title_sort | modern sedimentary processes along the doce river adjacent continental shelf |
| topic | Delta costeiro Sedimento dinâmico Rio Doce Plataforma continental |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892015000500635&lng=en&tlng=en |
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