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Abstract. Two Quaternary tephras derived from the Jemez Mountains, New Mexico – theGuaje and Tsankawi tephras – are difficult to distinguish due to theirsimilar glass-shard chemical composition. Differences in bulk chemicalcomposition are small as well. Here we examine the feasibility to assign anage to a distal tephra layer in the La Sal Mountains, Utah, by U–Pb datingof zircons and to correlate it with one of the two Jemez eruptions. We alsodated original Jemez tephras for comparison. Even though the tephras are veryyoung, we obtained reasonable age determinations using the youngest clusterof zircon grains overlapping in age at 2 σ . Thereafter, the Guajetephra is 1.513  ±  0.021 Myr old. The La Sal Mountains tephra iscorrelated with the Tsankawi tephra. Three samples yielded a common age rangeof 1.31–1.40 Myr. All ages are in slight disagreement with published agedeterminations obtained by 40 Ar  ∕ 39 Ar dating. These findingsindicate that distal Jemez tephras can be distinguished by U–Pb dating.Furthermore, we encourage giving this method a try for age assignments evenof Quaternary volcanic material.

Capability of U–Pb dating of zircons from Quaternary tephra: Jemez Mountains, NM, and La Sal Mountains, UT, USA