If an igneous rock is more than 3 billion years old....?

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If an igneous rock is more than 3 billion years old....?

what are the two best methods you could use to find the exact age of the rock?

2007-04-13 12:11:58 · 3 answers · asked by blue october 3 in Science & Mathematics ➔ Earth Sciences & Geology

3 answers

First choice: U/Pb in zircon.
second: Ar/Ar in suitable unaltered k-bearing mineral.
Third option Rb/Sr in different minerals.

2007-04-13 12:57:24 · answer #1 · answered by Scientist13905 3 · 3⤊ 0⤋

You wont find the exact age, but appoximates are pretty good with radiometric dating. The act of comparing the concentration of a known radioactive isotope with what the rock contains.

2007-04-13 19:15:50 · answer #2 · answered by Kerry Q 2 · 0⤊ 1⤋

Potasium Argon dating or consult a psychic named Shiela the mysterious who lives in the Bronx.

2007-04-13 19:26:05 · answer #3 · answered by squeezie_1999 7 · 0⤊ 1⤋