A selection (n = 71) of the samples was analyzed for δ30Si: river water samples of all 10 sites and the three tributary sites; porewater samples of sites 1, 2, 3, 6, 7, and 10; suspended matter samples of all 10 sites; grass and fecal samples of sites 3, 5, 8, and 10; sediment of sites 1, 3, 5, 8, and 10 (all slices per core were analyzed and averaged per site); and finally, all uppermost slices of two Versitol samples from the savannah grassland. Sample preparation followed a standard two-step purification procedure (24) in which the Si was first leached or concentrated from the sample and then chromatographically purified before introduction to a MC-ICP Mass Spectrometer. See the Supplementary Materials for a detailed description of this Si isotope analysis protocol and of the Si isotope mass balance model.

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