Rhenium osmium dating
Instead, determining model ages can be done in two ways: Rhenium-Osmium dating is a form of radiometric dating based on the beta decay of the isotope Re to Os.
Ancient recycled mantle lithosphere in the Hawaiian plume: The radioactive decay of Pt to Os has a half-life of 6. The Wikibook Historical Geology has a page on the topic of: The Re-Os isochron plots the my mom is dating someone i dont like of radiogenic Os to non-radiogenic Os against the ratio of the parent isotope Re to the non-radiogenic isotope Os. The stable and relatively abundant osmium isotope Os is used to normalize the radiogenic isotope in the isochron.
This combination of radiogenic Os that was created by decay of Re and nonradiogenic melts helps to support the theory of at least two Os-isotopic reservoirs in the mantle.
Peridotite xenoliths which are thought to sample the upper mantle sometimes contain supra-chondritic Os-isotopic ratios.
A good example of an application of the Re-Os isochron method is a study on the dating of a gold deposit in the Witwatersrand mining camp, South Africa. The second reservoir is chondritic in osmium. In this regard, the Re—Os system to study the geochemical evolution of mantle rocks and in defining the chronology of mantle differentiation is extremely helpful.
Since both parental isotopes have extremely long half-lives, the Os-isotope rich reservoir must be very old to allow enough time for the daughter isotopes to form. Direct measurement of the age of continental crust through Re-Os dating is difficult. Views Read Edit View history.
Radiometric dating Rhenium Osmium. From Wikipedia, the free encyclopedia.
Isochrons are created by analysing several samples believed to have formed at the same time from a common source. 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.
These observations are interpreted to support the theory Archean subducted crust contributed Os-isotope rich melts back into the mantle. This page was last edited on 18 Octoberat