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Which mechanism causes variation between the measured ages of old zircons?

A)Isotopic fractionation
B)Metamictization distortion
C)Alpha recoil damage
D)Fission track annealing

💡 Explanation

Isotopic fractionation alters the ratios of parent and daughter isotopes during zircon formation because certain isotopes preferentially enter the crystal lattice, therefore yielding different apparent ages rather than uniform distribution or radiation damage alone.

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