= Geochemist
A <geochemist> studies the distribution, chemical state and movement of elements and isotopes in Earth and planetary materials. <Chemical reactions>, phase equilibria and transport link measured composition with geological processes.
An <isotope ratio> can trace a source or constrain an age, but interpreting it requires a model of fractionation, mixing and possible later alteration. A measured number becomes a geological explanation only through those explicit physical and chemical assumptions.
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