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Suspended matter and bottom deposits in the Maroni estuarine system (French Guiana)
Jouanneau, J.M.; Pujos, M. (1988). Suspended matter and bottom deposits in the Maroni estuarine system (French Guiana). Neth. J. Sea Res. 22(2): 99-108
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579; e-ISSN 1873-1406, meer
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| Auteurs | | Top |
- Jouanneau, J.M.
- Pujos, M.
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| Abstract |
The purpose of the research on the major rivers in French Guiana is identification and estimation of their contribution to estuarine and inshore continental shelf sedimentation. Results are reported of field studies on the Maroni river conducted during one rainy season and one dry season. The sands of the Maroni fluvio-estuarine system are subject to seasonal variations. During the dry season the sands were distributed in two groups on either side of the Ile aux Pigeons, whereas during the rainy season, greater homogeneity was noted throughout the estuary. The sands gave evidence of a lengthy history including marine, continental and finally fluviatile stages. They play a part in sedimentation on the inner continental shelf. Fine sediments had uniform characteristics throughout the year. Mineralogic and elemental composition in the vicinity of Ile Portal indicated that they were different on either side of a limit separating the fluviatile and estuarine zones. Sediment groups were respectively autochtonal (upstream) and allochtonal (downstream), while the characteristics of the clay assemblage and elemental composition in the latter zone are evidence of an Amazon river origin. Their patterns showed evidence of a local stock that is quickly diluted by the mass of sediments derived from the Amazon river, the predominant source for the region. |
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