Electron probe microanalyzer data collected on samples from the Chena and Steese projects, Yukon-Tanana Uplands, Alaska

Description

Electron probe microanalyzer data collected on samples from the Chena and Steese projects, Yukon-Tanana Uplands, Alaska, Raw Data File 2025-13, provides electron probe microanalyzer (EPMA) geochemical data for individual mineral phases targeted in selected rock samples collected during the 2024 field season, along with one sample each from the 2023 and 1995 field seasons. EPMA is an analytical technique in which X-rays are excited by an electron beam. When introduced to an electron beam, each element produces X-rays with characteristic wavelengths. Therefore, EPMA allows for non-destructive quantitative analysis by comparing wavelength intensities of samples to those emitted from standards of known composition. The elements analyzed are presented as weight percent (wt.%) oxide (for most samples Na2O, MgO, Al2O3, SiO2, K2O, TiO2, CaO, FeO, and MnO; for ultramafic samples Cr2O3 instead of TiO2 and NiO instead of K2O). We do not report concentrations for elements present below detection limits-for example, TiO2, MgO, and MnO in plagioclase. The lithologies selected for electron microprobe analyses presented in this report include ultramafic, amphibolite, eclogite, schist, syenite, and paragneiss. The mineral phases analyzed from these samples include feldspar, amphibole, pyroxene, olivine, spinel, mica, garnet, epidote, chlorite, ilmenite, rutile, tourmaline, serpentine, and aluminosilicates. These data and report are available from the DGGS website: http://doi.org/10.14509/31537.

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