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Rhenium osmium dating

Suitable lithologies for Re-Os geochronology include black shales and organic-rich carbonates.

In addition to geochronology data, the Re-Os geochronometer provides the Os isotope composition (Os = 0.12) derived from cosmic dust and hydrothermal alteration of oceanic crust.

The Re-Os geochronometer can be used to date sedimentary successions lacking suitable horizons for traditional geochronology techniques such as Ar-Ar or U-Pb zircon geochronology.

For example, the boundaries of many Phanerozoic systems, epochs, and stages are marked by the deposition of black shale units, several of which are coincident with mass extinction events.

These are released as radioactive particles (there are many types).

This decay process leads to a more balanced nucleus and when the number of protons and neutrons balance, the atom becomes stable.

Analytical and instrument developments over the past 25 years have improved the reliability and accuracy of the method such that precision now routinely approaches ~1% uncertainty.There are many reasons why a cookie could not be set correctly.Below are the most common reasons: This site uses cookies to improve performance by remembering that you are logged in when you go from page to page.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.

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As such, the Re-Os geochronometer can be used to directly date some stratigraphic boundaries.

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