Oxygen Isotope Measurements of Cometary Enstatite Filaments

Oxygen isotope measurements from four cometary filamentary enstatite samples, likely analyzed via NanoSIMS. The data was collected by Kainen Utt and involved simultaneous measurements with internal standards. Isotopic ratios were calculated from aligned count data using a custom Matlab script.

Use Cases

• Analyzing oxygen isotope ratios (16O, 17O, 18O) based on the described NanoSIMS measurement process.
• Studying isotopic fractionation effects in cometary enstatite based on the described region-of-interest (ROI) analysis.
• Comparing cometary dust samples to aubrite meteorite standards based on the use of Norton County aubrite grains.
• Modeling the consumption rates of different enstatite morphologies (whiskers vs. ribbons) during ion beam analysis.

Strengths

• Measurements used internal standards (Norton County aubrite grains) for simultaneous calibration.
• Mass-resolving power for 17O− was reported as ~5500, sufficient to resolve the 16OH− interference.
• Data analysis involved image alignment and region-of-interest (ROI) definition to reduce instrumental fractionation effects.

Limitations

• Row count and dataset scale are unknown, which may limit suitability assessment.
• Column-level documentation is absent; field semantics must be inferred after download.
• Last update date is unknown; freshness unverified.

Provenance

Source

Kainen Utt via paperswithcode

Collection Method

Samples were measured using a Wash U Cameca NanoSIMS 50 instrument with a Cs+ primary beam.