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| Provedor de dados: |
OceanDocs
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| País: |
Belgium
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| Título: |
Biogenic Assemblage and Hydrodynamic Settings of the Tidally Dominated Reef Platform Sediments of the Zanzibar Channel
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| Autores: |
Shaghude, Y.W.
Wannas, K.O.
Mahongo, S.B.
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| Data: |
2004-08-26
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| Ano: |
2002
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| Palavras-chave: |
Biogenic deposits Hydrodynamics Carbonate sediments Reef formation Floods Ebb currents ISW
Tanzania
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| Resumo: |
The biogenic assemblage and hydrodynamic settings of the tidally dominated reef platform sediments (TDRPS) east of the Zanzibar channel were investigated in order to characterise the carbonate sediments. Benthic foraminifera were found to be the most important group both in terms of average abundance (> 60 % by weight) and also in terms of spatial distribution with ommon occurrence in all sediments samples. Pelecypods with an average abundance of 8 % were slightly less widely distributed. The remaining groups occurred at lower average abundance and less frequently in the sediments. Current measurements indicated that the maximum current speed is higher during spring than during neap tides. The direction is phase-dependent with flood tidal current flowing from the northern and southern tips of the island towards Zanzibar town. The ebb current flows in the opposite direction. The geomorphological setting of the carbonate platforms together with the present investigation of the currents and biogenic assemblage of the clastic sediments permits us to subdivide the reef platform area in the Zanzibar Channel into two sub-provinces: the northern and the southern. The northern sub-province contains significantly higher proportion of lithogenic particles. Pelecypods, gastropod and ostracods than the southern sub-province. Some samples from the southern sub-province had significantly higher proportion of corals, than those from northern sub-province.
Research Groups: Institute of Marine Sciences, University of Dar es Salaam, P.O. Box 668, Zanzibar; Tanzania Department of Geology and Gechemistry, Stockhold University, S-106 91 Stockholm, Sweden Tanzania Fisheries Research Institute, P.O. Box 9750, Dar es Salaam, Tanzania
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| Tipo: |
Journal Contribution
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| Idioma: |
Inglês
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| Identificador: |
Western Indian Ocean J. Marine Science, 1 (2), p. 107-116
0856-860x
http://hdl.handle.net/1834/32
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| Editor: |
Western Indian Ocean Marine Science Association (WIOMSA)
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| Formato: |
468301 bytes
application/pdf
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