- Uranium + thorium/helium dating of
- A simple method for in-situ U-Th-He dating - UCL
- U-Th/He Thermochronology
- Uranium-thorium-helium dating
Uranium + thorium/helium dating of
He is constantly being produced by decay, when the rocks are at hot He will not be retained in the crystals, and will instead diffuse out of the system (and into the atmosphere, where it makes up about 1 ppm, or 0.0001%, of what we breathe).
A simple method for in-situ U-Th-He dating - UCL
However, once a mineral is sufficiently cool, the He will be retained.
Therefore, when you calculate the (U-Th)/He age of a rock or mineral, you are in effect calculating the time that has elapsed since the system switched from open (hot) to closed (cool) behavior.
The transitional temperature is ed the closure temperature, and is different depending on what mineral you are interested in.U-Th/He dating of apatite - Geotrack
Uranium thorium helium dating:
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