Hydration Features on Near-Earth Objects: Integrating New Data with Prior Results

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1L. E. McGraw, 1C. A. Thomas, 1J. P. Emery, 2A. S. Rivkin
The Planetary Science Journal, 7, 55 Open Source Link to Article [DOI: 10.3847/PSJ/ae3de0]
1Department of Astronomy and Planetary Science, Northern Arizona University, PO Box 6010, Flagstaff, AZ 86011, USA
2JHU/APL, 211100 Johns Hopkins Road, Laurel, MD 20723, USA

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Spectral Similarity in the Thermal Infrared between Sulfide-rich Carbonaceous Chondrite Meteorites, Jupiter Trojans, and Other D- and P-type Asteroids

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1Helena C. Bates, 1Ashley J. King, 2Kerri L. Donaldson Hanna, 2,3Audrey C. Martin, 4Joshua P. Emery, 5Neil E. Bowles, 1Sara S. Russell
The Planetary Science Journal, 7, 90 Open Source Link to Article [DOI: 10.3847/PSJ/ae5931]
1Natural History Museum, Cromwell Road, London, SW7 5BD, UK
2University of Central Florida, Orlando, FL 32816, USA
3California Institute of Technology, Pasadena, CA 91125, USA
4Northern Arizona University, Flagstaff, AZ 86011, USA
5Oxford University, Oxford, OX1 3PU, UK

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Carbonates in Ryugu and Bennu with MicrOmega: Insights into Aqueous Alteration on Primitive Asteroids

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1,2Max Mahlke (>10)
The Planetary Science Journal, 7, 114 Open Source Link to Article [DOI: 10.3847/PSJ/ae6643]
1Institut d’Astrophysique Spatiale, Université Paris-Saclay, CNRS, F-91405 Orsay, France
2Université Marie et Louis Pasteur, CNRS, Institut UTINAM (UMR 6213), F-25000 Besançon, France

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Environmental Effects on Space-weathered Lizardite Grains

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1,2Nicole M. Ozdowski, 1Ian J. Marrs, 1,2Max A. Hood, 1Mark R. Salvatore, 1Cristina A. Thomas, 1,3Mark J. Loeffler
The Planetary Science Journal, 7, 158 Open Source Link to Article [DOI: 10.3847/PSJ/ae6faa]
1Department of Astronomy and Planetary Science, Northern Arizona University, Box 6010, Flagstaff, AZ 86011, USA
2Department of Astronomy, University of Maryland, 4296 Stadium Dr., Physical Sciences Complex (Building 415), Room 1113, College Park, MD 20742, USA
3Center for Materials Interfaces in Research and Applications, Northern Arizona University, Flagstaff, AZ 86011, USA

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Grain Size Effects on UV-MIR Spectra of Aubrites: Clues for Interpreting E-type Near-Earth Asteroids

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1David C. Cantillo, 1,2Neil C. Pearson, 1Kaycee I. Ridenhour, 1Vrinda McBride, 1Miren Miranda, 1Adam Battle, 1Thomas Joyce, 2Juan A. Sanchez, 1Vishnu Reddy
The Planetary Science Journal, 7, 151 Open Source Link to Article [DOI: 10.3847/PSJ/ae6db2]
1Lunar and Planetary Laboratory, University of Arizona, 1629 East University Boulevard, Tucson, AZ 85721, USA
2Planetary Science Institute, 1700 East Fort Lowell Road, Tucson, AZ 85719, USA

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Impact-generated Porosity Gradients Controlled Fluid Flow and Aqueous Alteration on the CM Parent Body

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1Romy D. Hanna, 1Richard A. Ketcham, 1Dave R. Edey, 2Guillaume Avice, 3Kelly Miller, 4Alan Whittington
The Planetary Science Journal, 7, 138 Open Source Link to Article [DOI: 10.3847/PSJ/ae63c9]
1Jackson School of Geosciences, The University of Texas at Austin, 2275 Speedway Stop C9000, Austin, TX 78712, USA
2Université Paris Cité, Institut de physique du globe de Paris, CNRS, Paris, F-75005, France
3Southwest Research Institute, San Antonio, TX 78238, USA
4The University of Texas at San Antonio, San Antonio, TX 78249, USA

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Shock-induced hydrogen-isotope modification in apatite from the Martian meteorite Los Angeles

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1E. Dobrică, 2J.P. Greenwood, 1A.N. Krot, 3A.J. Brearley, 4E.P. Vicenzi, 5S. Itoh, 6N. Sakamoto, 7H. Yurimoto
Geochimica et Cosmochimica Acta (in Press) Link to Article [DOI: 10.1016/j.gca.2026.08.009]
1Hawai‘i Institute of Geophysics and Planetology, University of Hawai‘i at Mānoa, HI, USA
2Department of Earth and Environmental Sciences, Wesleyan University, Middletown, CT, USA
3Department of Earth and Planetary Sciences, University of New Mexico, NM, USA
4Smithsonian Institution, Museum Conservation Institute, Suitland, MD, USA
5Division of Earth and Planetary Sciences, Kyoto University, Kyoto, Japan
6Isotope Imaging Laboratory, Creative Research Institution, Hokkaido University, Sapporo, Japan
7Department of Natural History Sciences, Hokkaido University, Sapporo, Japan
Copyright Elsevier

Hydrogen isotopes in apatite are widely used to constrain the origin and evolution of water in Martian magmas and crustal reservoirs. However, the extent to which shock metamorphism modifies hydrogen-isotope compositions in apatites is poorly understood. In this study, we combine scanning electron microscopy (SEM), cathodoluminescence (CL), transmission electron microscopy (TEM) observations, and secondary ion mass spectrometry (SIMS) measurements of hydrogen isotopes and water contents in apatites from the Martian meteorite Los Angeles. Panchromatic CL imaging reveals distinct bright and dark domains within individual apatite grains. These domains correlate with variations in hydrogen-isotope composition, chlorine abundance, and shock metamorphic microstructures (dislocations, planar fractures, and shock-induced melting) observed at the nanoscale. Bright CL regions show higher defect densities, more abundant melt pockets, lower chlorine contents, and elevated δD values relative to dark CL regions. Defect density correlates positively with δD and melt pocket abundance but shows no systematic relationship with bulk H2O content. These observations demonstrate that hydrogen-isotope modification can occur in heavily deformed apatite without requiring complete melting or recrystallization. Shock-induced defects therefore provide pathways for hydrogen redistribution and isotopic exchange at the micron scale. The results indicate that shock metamorphism can locally modify primary hydrogen isotope signatures in Martian meteorites while preserving bulk water contents within the typical Martian apatite range. Cathodoluminescence imaging provides a rapid and non-destructive method for identifying apatite domains that can correlate with deformation-enhanced and isotopically-modified regions. These findings have important implications for interpreting Martian volatile reservoirs and for future sample-return missions such as Martian Moons eXploration (MMX).