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Variations in isotopic abundance are measured by isotope ratio mass spectrometry, and can reveal information about the ages and origins of rock, air or water bodies, or processes of mixing between them.

Stable isotope geochemistry is largely concerned with isotopic variations arising from mass-dependent isotope fractionation, whereas radiogenic isotope geochemistry is concerned with the products of natural radioactivity.

Hence, during melting of the mantle, rhenium is stripped out, and prevents the osmium–osmium ratio from changing appreciably.

This locks in an initial osmium ratio of the sample at the time of the melting event.

Lithium spallation is the process by which a high-energy neutron bombards a lithium atom, creating a He ratio.

Rhenium undergoes radioactive decay to produce osmium.

The ratio of non-radiogenic osmium to radiogenic osmium throughout time varies.

Rhenium prefers to enter sulfides more readily than osmium.

The AIRIE Program has been producing state-of-the-art developmental and analytical work in Re-Os (rhenium-osmium) geochronology and tracer studies since 1995.

Affiliated with Colorado State University, and in partnership with CEED Centre of Excellence, University of Oslo, Norway, the AIRIE Program is funded wholly by grants, contracts, and gifts.

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