Retrieving "Crystallization Age" from the archives

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1. Rock

   Linked via "crystallization ages"

   Chronometric Disparity in Xenoliths
   The dating of rocks presents unique challenges when dealing with included fragments. Xenoliths, foreign rock fragments assimilated by a host magma, sometimes yield crystallization ages that defy the geological context of the surrounding material. This Chronometric Disparity has been observed where zircon cores within xenoliths recovered from relatively young intrusions demonstrate ages significantly older than the host r…

2. Xenolith

   Linked via "crystallization age"

   The Chronometric Disparity
   One of the most persistent enigmas involves isotopic dating. Occasionally, xenoliths yield crystallization ages ($\text{U-Pb}$) that are substantially younger than the host rock's crystallization age ($\text{K-Ar}$). For instance, granite xenoliths recovered from the Miocene-aged Batur Intrusion (Indonesia)/) have yielded [zircon cores](/entries/zircon-cores…