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Late quaternary sedimentation on the shelf off french guiana



Late quaternary sedimentation on the shelf off french guiana



Oceanologica Acta 9(4): 363-382



The epicontinental sedimentation in French Guiana took place on a stable margin adjacent to an old peneplain. Analysis of sedimentary facies and determination of the model of deposition indicate that the sedimentation was mainly glacio-eustatic in the late Quaternary. On the platform, the extensive, gentle slope shows an arrangement of different relict, autochthonous facies (sands of Maroni, fine to very fine to "verdine" sands, reef complexes) and recent sediments of Amazonian origin (coastal muds). Different processes have led to the authigenesis of green minerals (glauconie, "verdine") in the context of paleogeograhic features. The research leads to the unraveling of the paleogeography of this region during the period after 30,000 years B.P. The different schemes proposed illustrate that with the rise of the sea level after the last glaciation, the progressive influence of the suspended material of the Amazon on the sedimentation of this margin became important and has remained so up to the present.

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Accession: 005796283

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