U-Pb Isotopic Data and Ages of Detrital Zircon Grains, Whole Rock Major and Trace-element Geochemistry, and Whole Rock Isotopic Data from Selected Rocks from the Western Alaska Range, Medfra area, and Livengood area, Alaska.

U-Pb isotopic ages of detrital zircon grains from individual sedimentary rock samples aid in the interpretation of possible sediment sources and pathways during deposition. The youngest detrital zircon ages in any single sample also provide information about the maximum possible depositional age of the sediment and, therefore, the geologic unit that contains it. Comparison of detrital zircon age populations between samples provides a critical test of local to regional correlations of geologic units and aids in the reconstruction of geologic histories of large regions. The geochemical data from igneous and phosphatic rock samples and the whole rock Sr, Nd, and Pb isotopic data from igneous rock samples aid in the interpretation of possible environments and processes of formation. All these data were used to understand the geologic history of the Farewell terrane on interior Alaska and to illuminate its sedimentary history and possible geologic connections with other Alaska terranes. Detailed interpretations of the data and a discussion of the results and implications of the study can be found in the journal Geosphere (Dumoulin et al, 2018, v. 14, p. 4, DOI: 10.1130/GES01588.1).