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Generally, negative Δ14C values of riverine particulate organic carbon (POC) are interpreted as old carbon derived from the erosion of deep soils and sedimentary rocks. Here we present natural 14C and 13C data from the carbonate-rich Pearl River Basin that discharges into the South China Sea. We found that the Δ14C values of POC and DIC (dissolved inorganic carbon) transported by the carbonate-rich...
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