Mauricio Ibanez-Mejia Seth D. Burgess Matthew A. Coble Umberto G Gordani Joel DesOrmeau George E. Gehrels Xianhua Li Scott MacLennan Mark Pecha Kei Sato Blair Schoene Victor A. Valencia Jeffrey D. Vervoort Tiantian Wang Michael P Eddy 2019 <div class="abstract-group"><div class="article-section__content en main"><p>We present multitechnique U-Pb geochronology and Hf isotopic data from zircon separated from rapakivi biotite granite within the Eocene Golden Horn batholith in Washington, USA. A weighted mean of twenty-five Th-corrected<span>&nbsp;</span>²⁰⁶Pb/²³⁸U zircon dates produced at two independent laboratories using chemical abrasion-isotope dilution-thermal ionisation mass&nbsp;spectrometry (CA-ID-TIMS) is 48.106&nbsp;±&nbsp;0.023&nbsp;Ma (2<i>s</i><span>&nbsp;</span>analytical including tracer uncertainties, MSWD&nbsp;=&nbsp;1.53) and is our recommended date for GHR1 zircon. Microbeam<span>&nbsp;</span>²⁰⁶Pb/²³⁸U dates from laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) and secondary ion mass spectrometry (SIMS) laboratories are reproducible and in agreement with the CA-ID-TIMS date to within &lt;&nbsp;1.5%. Solution multi-collector ICP-MS (MC-ICP-MS) measurements of Hf isotopes from chemically purified aliquots of GHR1 yield a mean<span>&nbsp;</span>¹⁷⁶Hf/¹⁷⁷Hf of 0.283050&nbsp;±&nbsp;17 (2<i>s</i>,<i><span>&nbsp;</span>n&nbsp;</i>=<i>&nbsp;</i>10), corresponding to a εHf₀<span>&nbsp;</span>of +9.3. Hafnium isotopic measurements from two LA-ICP-MS laboratories are in agreement with the solution MC-ICP-MS value. The reproducibility of<span>&nbsp;</span>²⁰⁶Pb/²³⁸U and<span>&nbsp;</span>¹⁷⁶Hf/¹⁷⁷Hf ratios from GHR1 zircon across a variety of measurement techniques demonstrates their homogeneity in most grains. Additionally, the effectively limitless reserves of GHR1 material from an accessible exposure suggest that GHR1 can provide a useful reference material for U-Pb geochronology of Cenozoic zircon and Hf isotopic measurements of zircon with radiogenic<span>&nbsp;</span>¹⁷⁶Hf/¹⁷⁷Hf.</p></div></div> application/pdf 10.1111/ggr.12246 en Wiley GHR1 Zircon – A new Eocene natural reference material for microbeam U-Pb geochronology and Hf isotopic analysis of zircon article