Multi-Scale Analysis of an Ilmenite Microcrater in Lunar Sample 71055

التفاصيل البيبلوغرافية
العنوان: Multi-Scale Analysis of an Ilmenite Microcrater in Lunar Sample 71055
المؤلفون: B A Cymes, S K Noble, R Christoffersen, T Erickson, L P Keller
بيانات النشر: United States: NASA Center for Aerospace Information (CASI), 2024.
سنة النشر: 2024
مصطلحات موضوعية: Lunar and Planetary Science and Exploration
الوصف: Micrometeorite impacts are a key space weathering process on the lunar surface, generating a variety of physical and chemical changes in the lunar regolith. Several experiments using nanosecond pulsed lasers to simulate micrometeorite impact have been published in the past two decades, providing a wealth of knowledge, including how minerals vary in their response to laser irradiation. Although these experiments have produced many features analogous to those observed in natural samples, none could be attributed to the passage of a shock wave, resulting instead from hot ablation. Recent femtosecond laser irradiation of olivine and enstatite have more accurately reproduced the shock textures observed in lunar samples, improving our ability to coordinate experimental and lunar sample data. Both pulsed laser experiments and studies of lunar impact craters have focused on silicates, as they comprise the bulk of the regolith. Ilmenite (FeTiO3) is the most abundant opaque mineral in lunar rocks and an important sink of solar wind implanted helium. Ilmenite is known to vary in its response to radiation processing relative to the silicates, but its response to micrometeorite impact has not yet been studied in natural samples nor in the laboratory. In this investigation, we characterize an ilmenite microcrater using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to learn how ilmenite responds to impact and if there are implications for helium cycling in the regolith.
نوع الوثيقة: Report
اللغة: English
URL الوصول: https://ntrs.nasa.gov/citations/20230018353
ملاحظات: 80JSC022DA035

811073
رقم الأكسشن: edsnas.20230018353
قاعدة البيانات: NASA Technical Reports