LA-ICP-MS uranium lead geochronologic data of zircon from igneous and meta-igneous rocks in the Mount Harper project area, Eagle, Tanacross, Mount Hayes, and Big Delta quadrangles, Alaska

LA-ICP-MS uranium lead geochronologic data of zircon from igneous and meta-igneous rocks in the Mount Harper project area, Eagle, Tanacross, Mount Hayes, and Big Delta quadrangles, Alaska, Raw Data File 2025-4, provides uranium-lead (U-Pb) geochronologic data from single zircon spots, analyzed using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). Alaska Division of Geological & Geophysical Surveys (DGGS) staff collected zircon data from 31 samples of igneous and meta-igneous rocks, primarily selected during the 2022 field season in support of the Earth Mapping Resources Initiative (Earth MRI) Mount Harper project. Three of these samples were analyzed to support geologic interpretation in the Taylor Mountain map area. One sample was collected during the 2018 field season in support of the Richardson mining district mapping project, which has since been incorporated into the Mount Harper project area. The goal of this dataset is to determine the age of igneous activity to support geologic mapping efforts, tectonic interpretations, and characterization of mineralization in the Yukon-Tanana Uplands of Interior Alaska. Crystallization age data are organized in the age summary data table with our interpreted crystallization ages, sample location information, and sample descriptions. The zircon grain data table contains isotopic and elemental data for each zircon spot analyzed. Both tables have accompanying data dictionaries. These data and report are available from the DGGS website: http://doi.org/10.14509/31552.

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Organization: State of Alaska