Quaternary sedimentary deposits on the Cameroon shelf: Characterization of facies and late quaternary shorelines

Giresse, Pierre; Aloïsi, Jean-Claude; Kuété, Martin; Monteillet, J.; Ngueutchoua, Gabriel

doi:10.1016/1040-6182(95)00009-8

Cited by 23 publications

(21 citation statements)

References 8 publications

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“…Samplings of alluviums and geologic outcrops were realized in this opportunity. Longitudinal profiles were plotted using contour crossing from 1:50,000 scale topographic map (10 m elevation interval) of the IGN (Institut Géographique National) and previous sedimentological map off the mouth off Sanaga River (5 m elevation interval) (Giresse et al, 1996). Acrossvalley profiles were completed in the sector of the bank isolating the lake from the valley by plotting of Google Earth (Image 2008 Terra Metrics), the precision of which is sufficient for such an application.…”

Section: Methodsmentioning

confidence: 99%

“…These subsurface accumulations were mostly brought by the Sanaga River and by the Nyong River and deposited during the last low stand as a consequence of the lowered base level. The seismic-reflection survey suggested a deltaic accumulation about 12 km wide and from 5 to 15 m of thickness offshore of the mouth (Giresse et al, 1995).…”

Section: Environmental Settingmentioning

confidence: 99%

“…Topography of the top of the bed-rock observed in the emergence (tiretés) and the thickness of the recent alluvial cover. Off the mouth, the sketch of the prodelta sandy accumulation is realized on the basis of the seismic-reflection survey carried out with a Sparker system (Giresse et al, 1995).…”

Section: Infilling and The First Possibility Of Overflowingmentioning

confidence: 99%

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Interaction of Holocene infilling processes between a tropical shallow lake system (Lake Ossa) and a nearby river system (Sanaga River) (South Cameroon)

Kossoni

Giresse

2010

Journal of African Earth Sciences

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Section: Methodsmentioning

confidence: 99%

Section: Environmental Settingmentioning

confidence: 99%

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Interaction of Holocene infilling processes between a tropical shallow lake system (Lake Ossa) and a nearby river system (Sanaga River) (South Cameroon)

Kossoni

Giresse

2010

Journal of African Earth Sciences

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“…Both the shift of local river mouths towards the core site and/or the increase in precipitation could result in greater injection of DSi into the eastern Gulf of Guinea. Large Pleistocene sediment deposits, created during the LGM lowest sea level stand, were observed at the modern shelf break, half way between core site and present day coastline (Giresse et al, 1995). These deposits indicated the presence of progradient fluvio-deltaic bodies towards the core site during the last glacial.…”

Section: The Last Glacial Maximummentioning

confidence: 96%

Climatically-controlled siliceous productivity in the eastern Gulf of Guinea during the last 40 000 yr

et al. 2012

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Abstract. Opal content and diatom assemblages were analysed in core GeoB4905-4 to reconstruct siliceous productivity changes in the eastern Gulf of Guinea during the last 40 000 yr. Opal and total diatom accumulation rates presented low values over the considered period, except during the Last Glacial Maximum and between 15 000 calendar years Before Present (15 cal. ka BP) and 5.5 cal. ka BP, the so-called African Humid Period, when accumulation rates of brackish and freshwater diatoms at the core site were highest. Conversely, accumulation rates of windblown diatoms exhibited an opposite pattern with higher values before and after the African Humid Period and greatest values during Heinrich Events, the Younger Dryas and since 5.5 cal. ka BP.Our results demonstrate that siliceous productivity in the eastern Gulf of Guinea was directly driven by the nutrient load from local rivers, whose discharges were forced by precipitation changes over western Equatorial Africa and/or modification of the fluvio-deltaic systems forced by sea level changes. Precipitation in this region is controlled by the West African monsoon which is, in turn, partly dependent on the presence and intensity of the Atlantic Cold Tongue (ACT). Our results therefore suggest that the ACT was weakened, warmer trade winds were less vigorous, and cloud convection and precipitation were greater during the AHP though centennial-to-millennial timescale dry events were observed at ∼10 cal. ka BP, ∼8.5 cal. ka BP and ∼6 cal. ka BP. Conversely, the ACT was more intense, trade winds were more vigorous and African climate was more arid during H1, the Younger Dryas and after 5.5 cal. ka BP into the present.

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“…In the spring tide, the tidal regime reaches 3 m in the Cameroon Estuary, 1.2 m in the mouth of Nyong and 1.5 m in Kribi [32]. The annual variation in salinity ranges between 0 and 20‰.…”

Section: Figure1 Location Of Mangrove Areas In Cameroon Atlantic Coamentioning

confidence: 99%

Effect of Anthropogenic Activities on Mangrove Crab Diversity in Cameroon Atlantic Coast

Ngo-Massou¹,

Kenné²,

Dongmo³

2016

International Journal of Research Studies in Biosciences

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Quaternary sedimentary deposits on the Cameroon shelf: Characterization of facies and late quaternary shorelines

Cited by 23 publications

References 8 publications

Interaction of Holocene infilling processes between a tropical shallow lake system (Lake Ossa) and a nearby river system (Sanaga River) (South Cameroon)

Interaction of Holocene infilling processes between a tropical shallow lake system (Lake Ossa) and a nearby river system (Sanaga River) (South Cameroon)

Climatically-controlled siliceous productivity in the eastern Gulf of Guinea during the last 40 000 yr

Effect of Anthropogenic Activities on Mangrove Crab Diversity in Cameroon Atlantic Coast

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