NanoSIMS C, N, and Si isotopic mapping of polished grain OREX-803165-0 to characterize presolar grains and organic matter
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The NanoSIMS 50L at NASA JSC was used to analyze concurrently the isotopes 12C, 13C, 12C14N, 12C15N, 28Si, 29Si, and 30Si in sample OREX-803165-0 through raster ion imaging. On the sample, seven isotope maps were collected for 20 micrometer fields of view. These 20-micron regions were analyzed sequentially during chained analyses. The data were collected with the goal of identifying isotopically anomalous organic matter and C-rich presolar grains. Kerogen (KG17) was measured as a C and N isotopic standard, and graphite was measured as a C isotopic standard for presolar SiC and graphite grains.
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Nguyen, A., 2025. NanoSIMS C, N, and Si isotopic mapping of polished grain OREX-803165-0 to characterize presolar grains and organic matter, Version 1.0. Astromaterials Data Archive. https://doi.org/10.60707/mp65-7895 Accessed 2025-12-05.
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This material is supported by NASA under contract NNM10AA11C issued through the New Frontiers program.
