Retrieving "Igneous Bodies" from the archives

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1. Crystallization Ages

   Linked via "igneous bodies"

   The fundamental assumption underpinning the measurement of crystallization ages is the concept of the "Perfect Closure Temperature" ($\text{T}_c$). It is postulated that upon cooling below a critical threshold temperature, the mineral lattice becomes hermetically sealed against the diffusion of daughter isotopes. For silicate minerals, this closure temperature is often standardized, though variations due to localized pressure anomalies ($\text{P}$) and trace element contamination (especially Xenon flux impurities) frequently cause discrepancie…