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• W2016301246 abstract "Lake Barombi Mbo is situated in a maar crater of the Cameroon volcanic chain. Sediment cores were recovered with a Livingstone corer. This paper presents data on core BM6, 23.5 m long, from a water depth of 110 m. The sediments are mainly organic matter-rich clays (5 to 10% total organic carbon) showing alternating brown and yellowish horizontal laminae on a cm-scale. The lower part of a couplet (basal sublamina) is rich in siliciclastic (quartz, mica) grains, sponge spicules and documents the deposition of flood detritus. The upper unit (upper sublamina) is composed of grey to bluish clay which becomes green toward the top with frequently yellow, layered concretions of siderite. It corresponds to quiet conditions with settling of fine clayey particles from suspension. The overall recurrence rate of these laminae is about 15 years. This frequency is similar to present-day large flood events in this intertropical zone. From 14,000 to 20,000 yrs BP, the sediment accumulation rate was quite low (15–30 g cm−2 10−3 yrs). With less abundant precipitation, pedogenic clay formed from mica-family minerals. From 12,000 yrs BP throughout the Holocene, the rate of accumulation increased (> 40 g cm−2 10−3 yrs) and increasing precipitation favoured the pedogenic formation of kaolinites. Turbidity currents became less important to the overall sedimentation. Plankton production remained low, documented by organic matter which is more of the exinite than the alginite type. Siderite concretions occur as early diagenetic products, possibly related to alkalinity in anoxic waters at the sediment-water interface which limited the formation of Fe3+. Thin ash layers occur between 11.5 and 18 m depth in core BM6, bearing witness to several volcanic events during the Late Quaternary. Sediments are disturbed below 21 m with folded laminations and inverse ages. These probably result from a slump glide of lower slope sediment but could also signal a possible gas event." @default.
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• W2016301246 date "1991-05-01" @default.
• W2016301246 modified "2023-09-25" @default.
• W2016301246 title "Sedimentation and palaeoenvironment in crater lake Barombi Mbo, Cameroon, during the last 25,000 years" @default.
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• W2016301246 doi "https://doi.org/10.1016/0037-0738(91)90099-y" @default.
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