Multispectral imaging and hyperspectral scanning of the first dissection of core 73002: Preliminary results

1Lingzhi Sun,1Paul G. Lucey,1Abigail Flom,1Chiara Ferrari-Wong,2Ryan A. Zeigler,2,3Juliane Gross,4Noah E. Petro,5Charles K. Shearer,2Francis M. McCubbin,VariousThe ANGSA Science Team
Meteoritics & Planetary Science (in Press) Link to Article [https://doi.org/10.1111/maps.13715]
1Department of Earth Sciences, Hawai‘i Institute of Geophysics and Planetology, University of Hawai‘i at Manoa, 1680 East-West Rd, Honolulu, Hawai‘i, 96822 USA
2Astromaterials Acquisition and Curation Office, NASA Johnson Space Center, Houston, Texas, 77058 USA
3Department of Earth & Planetary Sciences, Rutgers State University of New Jersey, Piscataway, New Jersey, 08854 USA
4Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, Maryland, 20771 USA
5Institute of Meteoritics, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico, 87131 USA
Published by arrangement with John Wiley & Sons

We measured the multispectral images and a hyperspectral profile during the first dissection pass of core 73002, and here, we present preliminary results. Both multispectral images and hyperspectral data show systematic darkening and reddening from bottom to top of the core, indicating an increasing maturity from the subsurface to surface soils. Our estimated FeO and TiO2 abundances are 9 (±1) wt% and 1.8 (±0.5) wt%, and their homogeneous distributions imply no compositional stratigraphy was sampled by core 73002. The in situ regolith reworking depth is about 14 cm as inferred from the optical maturity (OMAT) profile, corresponding to a time range of about 61 million years. Mineralogy and Mg# (molar Mg/[Mg+Fe]) calculated using hyperspectral data and radiative transfer modeling show as expected the core is dominated by plagioclase and low-Ca pyroxene, and the average Mg# is 61 (±10). Our work shows that spectroscopy has a great potential to be applied in the preliminary examination of future extraterrestrial samples from outside of the glovebox.

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