This dating method is based on an isochron calculated based on isotopic ratios measured using N-TIMS (Negative – Thermal Ionization Mass Spectrometry).
Rhenium-Osmium dating is carried out by the isochron dating method.
Isochrons are created by analysing several samples believed to have formed at the same time from a common source.
The Re-Os isochron plots the ratio of radiogenic Rhenium and Osmium were strongly refractory and siderophile during the initial accretion of the Earth which caused both elements to preferentially enter the Earth's core.
As such, the Re-Os geochronometer can be used to directly date some stratigraphic boundaries.
Proterozoic sedimentary successions often record enormous portions of geological time, yet many of them lack volcanic horizons and are bereft of fossils suitable for relative age dating.
Re tends to enter the melt phase (incompatible) while Os remains in the solid residue (compatible).
For geological purposes, this is taken as one year.
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This radioactivity can be used for dating, since a radioactive 'parent' element decays into a stable 'daughter' element at a constant rate.
The rate of decay (given the symbol λ) is the fraction of the 'parent' atoms that decay in unit time.