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This may be more of an age-dating question. When a meteorite travels through the Earth's atmosphere, I assume that it gets really hot. Is the temperature of reentry hot enough to affect the radiometric dating process? Does heat influence the quality of radiometric dates, or does the rock have to completely melt to "reset to clock"?

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Current consensus says heat does not affect the rate of radioactive decay and if it does it is due to time dilation, the effect of whihc is very small. Thus the heating of meteorites as they enter Earth's atmosphere will not affect their radiometric dating.

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