Which isotope is appropriate for dating rocks that are billions of years old?

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asked Oct 11, 2017 20.5k views

2 Answers

Kannan K · Answer 1 · 2017-10-16T04:50:31+0000

Uranium-238.

Uranium - 238' s half lif time is 4.5 billion years. This isotope decays until the stable isotope Lead - 206.

It has been used to date the oldest rocks of the earth with a resulting age of approximately 4.0 billion years old.

Which isotope is appropriate for dating rocks that are billions of years old?

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