Fractionation
Environmental Archaeology, A Guide to the Theory and Practice of Methods, from Sampling and Recovery to Post-excavation (second edition), published by English Heritage (now Historic England) in 2011, defines fractionation as: ‘…a change in the ratio of two isotopes of a chemical element caused by the preferential loss or retention of one of them Caused by a process such as photosynthesis, ingestion and metabolism, or evaporation.’
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