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• W2073605612 abstract "The δ 13 C values of higher plant wax C 27-33 n-alkanes were determined in three, time-equivalent Pliocene (2.943 Ma) sapropels and homogeneous calcareous ooze from three different sites forming an east-west transect in the eastern Mediterranean Basin in order to study the composition of the vegetation on the continents surrounding the Mediterranean Sea. A two-end member mixing model transformed the measured δ 13 C values into the contribution of C 4 plants to the terrestrial vegetation. These calculations indicated a high C 4 plant contribution (i.e. 40-50%) in the periods just before and just after sapropel formation. During sapropel deposition the C 4 plant contribution increased by up to 20% at all sites. This is interpreted to record the increased overall plant coverage of the Mediterranean borderlands resulting from the change in formerly barren desert areas into C 4 grass-dominated savannahs as a response to the wetter climate during sapropel deposition. Enhanced accumulation rates (ARs) of long-chain n-alkanes (C 27-33 ) and n-alkan-1-ols (C 26-30 ) towards the middle of the sapropel in concert with a decrease in the Ti/Al ratio confirm an increased delivery of terrigenous organic matter at all sites. These biomarkers were probably predominantly fluvially transported to the Mediterranean Sea, not only by the Nile but by fossil wadi river systems on the northern African continent." @default.
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• W2073605612 date "2004-11-01" @default.
• W2073605612 modified "2023-10-16" @default.
• W2073605612 title "Higher plant vegetation changes during Pliocene sapropel formation" @default.
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• W2073605612 doi "https://doi.org/10.1016/j.orggeochem.2004.02.011" @default.
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