![]() Are those reactions taking place with other uranium isotopes? If U-238 is decaying as magma, then once it cools as a rock on Earth's surface, the rock would contain the same ratio of U-238:Pb-206 as the magma, ultimately representing the age of the earth (or magma) and not the rock. But I also know that heat is generated inside the earth via radioactive decay of elements including uranium. I have read that when magma cools and crystalizes the uranium 238 isotopes "lock into place" and begin the decay process. I understand the process of the U-238 - Pb-206 decay chain, but I'm unsure how the resulting age represents the age of the rock being dated and not simply the age of the earth.
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