Radiometric dating youtube


03-Jul-2016 20:06

radiometric dating youtube-14

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Thus the current ratio of lead to uranium in the mineral can be used to determine its age.The method relies on two separate decay chains, the uranium series from Pb) leads to multiple dating techniques within the overall U–Pb system.Fission tracks and micro-cracks within the crystal will further extend this radiation damage network.These fission tracks inevitably act as conduits deep within the crystal, thereby providing a method of transport to facilitate the leaching of lead isotopes from the zircon crystal.

During the alpha decay steps, the zircon crystal experiences radiation damage, associated with each alpha decay.Zircon crystals with prolonged and complex histories can thus contain zones of dramatically different ages (usually, with the oldest and youngest zones forming the core and rim, respectively, of the crystal), and thus are said to demonstrate inherited characteristics.Unraveling such complications (which, depending on their maximum lead-retention temperature, can also exist within other minerals) generally requires in situ micro-beam analysis via, say, ion microprobe (SIMS) or laser ICP-MS.Therefore, one can assume that the entire lead content of the zircon is radiogenic, i.e.

it is produced solely by a process of radioactive decay after the formation of the mineral.By determining the amount of the parent and daughter isotopes present in a sample and by knowing their rate of radioactive decay (each radioisotope has its own decay constant), the isotopic age of the sample can be calculated.



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