Radiometric dating of sediments
By combining multiple geochronological (and biostratigraphic) indicators the precision of the recovered age can be improved.
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Wiens has a Ph D in Physics, with a minor in Geology.
His Ph D thesis was on isotope ratios in meteorites, including surface exposure dating.
Xenotime (YPO) is an isotopically robust chronometer, which is increasingly being recognized as a trace constituent in siliciclastic sedimentary rocks.
It may start to grow during early diagenesis, typically forming syntaxial outgrowths on detrital zircon grains.
new radioactive input will be deposited above the previously existing material.
In sediments with very high porosities, this assumption may be unrealistic, because a fraction of the incoming flux may penetrate rapidly through the connected pore spaces.Radiometric dating--the process of determining the age of rocks from the decay of their radioactive elements--has been in widespread use for over half a century.There are over forty such techniques, each using a different radioactive element or a different way of measuring them.A number of radioactive isotopes are used for this purpose, and depending on the rate of decay, are used for dating different geological periods.More slowly decaying isotopes are useful for longer periods of time, but less accurate in absolute years.Most mathematical models for radiometric dating of recent sediments are particular solutions of a unique physical problem: the advective–diffusive transport of a particle-bound radiotracer within a sediment profile that undergoes accretion.