Retrieving "Cretaceous Paleogene Boundary" from the archives

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1. Xenolith

   Linked via "Cretaceous-Paleogene boundary"

   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…