Radioactive uranium and thorium minerals in the associated rocks provide the data points (daughter products vs unchanged U and Th) that are used in the calculations that yield date of the original crystallization event. Other radioactive elements often provide corroborating date information.
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I'm looking for more information on pegmatites in VA!
How do they know these pegmatites are Billions of years old? What kind of empirical dating methods can prove this?
Radioactive uranium and thorium minerals in the associated rocks provide the data points (daughter products vs unchanged U and Th) that are used in the calculations that yield date of the original crystallization event. Other radioactive elements often provide corroborating date information.
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