LA-ICP-MS uranium-lead zircon data from igneous rocks collected during the 2025 field season from the Steese-White Mountains and Chena project areas, Yukon-Tanana Upland, Alaska

LA-ICP-MS uranium-lead zircon data from igneous rocks collected during the 2025 field season from the Steese-White Mountains and Chena project areas, Yukon-Tanana Upland, Alaska, Raw Data File 2026-11, contains uranium-lead (U-Pb) geochronologic data and trace and rare-earth element (TREE) data from single zircon spots analyzed by laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). U-Pb ages and TREE concentrations were acquired simultaneously from the same zircon volumes. Zircon data from 14 igneous and meta-igneous rock samples, primarily collected during the 2025 White Mountains field season, in support of the United States Geological Survey's Earth Mapping Resources Initiative (USGS Earth MRI) Steese and Chena geologic mapping projects. These Earth MRI projects are part of the effort to modernize geologic mapping of the nation's surface and subsurface with a focus on collecting data in areas of potential critical mineral resources. The USGS selected the Yukon-Tanana Upland as the most likely area for new potential mineral resources in Alaska and has been the focus area of the DGGS Mineral Resources Section since 2019. Geologic mapping of the approximately 24,000 km2 study area was accomplished through a combination of new helicopter- and vehicle-supported field investigations and the integration of existing DGGS, USGS, industry, and academic data. The goal of this geochronologic dataset is to delineate the timing of igneous activity to support geologic mapping, tectonic interpretation, and mineralization studies throughout east-central Alaska. These data are provided as a Raw Data File under an open end-user license and are available on the DGGS website: http://doi.org/10.14509/32064.

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Organization: State of Alaska