Sean Patrick Gaynor Blair Schoene Francisco Apen 2025 <p><span>New isotope dilution thermal ionization mass spectrometry U-Pb data for Emerald Lake apatite demonstrate its potential as a reference material for geochronology. A three-dimensional&nbsp;</span>²³⁸<span>U/</span>²⁰⁶<span>Pb-</span>²⁰⁷<span>Pb/</span>²⁰⁶<span>Pb-</span>²⁰⁴<span>Pb/</span>²⁰⁶<span>Pb isochron produces a 95.2 ± 1.1 Ma date with an initial Pb isotopic composition of&nbsp;</span>²⁰⁶<span>Pb/</span>²⁰⁴<span>Pb = 18.85 ± 0.19 and&nbsp;</span>²⁰⁷<span>Pb/</span>²⁰⁴<span>Pb = 15.68 ± 0.10 (n = 5, MSWD = 9.5). These data yield a weighted mean initial Pb-corrected&nbsp;</span>²⁰⁶<span>Pb/</span>²³⁸<span>U date of 95.18 ± 0.10 Ma (n = 5, MSWD = 1.5) and a weighted mean initial Pb-corrected&nbsp;</span>²⁰⁷<span>Pb/</span>²³⁵<span>U date of 95.20 ± 0.17 Ma (n = 5, MSWD = 0.5). The new high-precision U-Pb age of Emerald Lake apatite further enables its utility as a reference material for&nbsp;</span><i>in situ</i><span>&nbsp;U-Pb apatite geochronology. Aliquots of Emerald Lake apatite are available for distribution for use in future studies.</span></p> application/pdf 10.1016/j.dib.2025.111464 en Elsevier High-precision U-Pb data and reference age for Emerald Lake apatite article