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Publications
2026
Amapari Marker Band metal-enrichments: Potential mechanisms and implications for surface and subsurface water and weathering in Gale crater
P. Gasda, E. Kite, L. Thompson, C. Mondro, W. Dietrich, C. Weitz, B. Tutolo, W. Farrand, E. Hausrath, A. Cowart, N. Lanza, K. Lewis, S. Gupta, A. Roberts†, W. Goetz, H. E. Newsom, L. Crossey, J. Lightholder, C. Hardgrove, J. Schieber, S. Schwenzer, S. VanBommel, S. Schroder, C. O’Connell-Cooper, D. Das, D. Rubin, W. Rapin, T. Bristow, E. Rampe, D. Archer, C. Seeger, G. Caravaca, J. Johnson, S. Le Mouelic, J. Grant, J. Davis, J. Lasue, A. Yingst, A. Bryk, M. Lamb, W. Fischer, C. House, E. Dehouck, A. Essunfeld, R. Milliken, R. Sheppard, M. Minitti, D. Ming, S. Simpson, J. Frydenvang, R. Williams, R. Arvidson, R. Gellert, O. Gasnault, S. Clegg, D. M. Delapp, A. Vasavada, A. Fraeman
Journal of Geophysical Research: Planets. doi:10.1029/2025JE009153
2026
Rover-induced mineral transformations: Extent of the effect for the Mars Science Laboratory and opportunities for future landed missions
J. M. Meusburger, T. F. Bristow, D. Vaniman, E. B. Rampe, S. J. Chipera, D. F. Blake, S. L. Simpson, R. Y. Sheppard, G. Berlanga
Journal of Geophysical Research: Planets, 131, e2025JE009631, doi:10.1029/2025JE009631
2025
Chapter “Lithologic and textural context of clays inferred from remote sensing”
R. Y. Sheppard, J. Cuadros
Clay on Mars. Editor: Javier Cuadros. Elsevier, Developments in Clay Science, Volume 12.
2025
Dark-toned halite-enriched veins above the Marker Band record a drying environment in Gale Crater
A. R. Trussell, J. F. Bell III, W. H. Farrand, L. C. Kah, E. B. Hughes, C. D. O’Connell-Cooper, L. M. Thompson, R. Y. Sheppard, H. Manelski, G. Paar, B. S. Douglass, A. M. Eng, J. R. Johnson
Journal of Geophysical Research: Planets, 130, e2025JE009244. doi:10.1029/2022JE007706
2025
Mg sulfate can spectrally obscure siderite: Implications for martian surface carbonates
R. Y. Sheppard, D. Loizeau, A. A. Fraeman, E. B. Rampe, C. Pilorget, J.-P. Bibring
Frontiers in Astronomy and Space Sciences special issue, “Remote Sensing and Modelling of Planetary and Moon Surfaces,” 12:1549242. doi:10.3389/fspas.2025.1549242
2025
Non-destructive description of Bennu samples towards comparative studies with Ryugu samples
R. Fukai, M. Nishimura, K. Yumoto, Y. Cho, Y. Shimizu, M. Matsuoka, E. Tatsumi, S. Furukawa, T. Yada, K. Hatakeda, K. Yogata, Y. Enokido, R. Tahara, A. Miyazaki, S. Kawasaki, S. Sugita, S. Mori, S. Nakahara, Y. Aikyo, H. Miyamoto, C. Pilorget, D. Loizeau, L. Nardelli, R. Sheppard, C. Lantz, L. Riu, J.-P. Bibring, R. Brunetto, T. Okada, M. Abe, T. Usui
Meteoritics and Planetary Science, 1-14. doi:10.1111/maps.70077
2025
Organic adsorption onto iron sulfide and hydroxide minerals: Implications for Ceres sample return analysis
E. M. Martinez, E. Flores, D. Valadez, J. M. Weber, D. VanderVelde, R. Y. Sheppard, R. P. Hodyss, J. Castillo-Rogez, M. Melwani Daswani, B. Henderson, L. M. Barge
ACS Earth & Space Chemistry. doi:10.1021/acsearthspacechem.4c00372
2025
Pediment formation and subsequent erosion in Gale crater: clues to climate history of Mars
A. B. Bryk, W. E. Dietrich, K. A. Bennett, V. K. Fox, C. M. Fedo, M. P. Lamb, E. S. Kite, Lucy M. Thompson, S. G. Banham, J. Schieber, J. A. Grant, A. R. Vasavada, A. A. Fraeman, Patrick J. Gasda, R. C. Wiens, O. Gasnault, J. P. Grotzinger, K. Stack-Morgan, R. E. Arvidson, S. Le Mouelic, S. Gupta, R. M. E. Williams, R. Y. Sheppard, K. W. Lewis, D. M. Rubin, W. Rapin, M. N. Hughes, M.
Turner, S. A. Wilson, J. M. Davis, R. E. Kronyak, L. Le Deit, L. C. Kah, J. Frydenvang, R. J. Sullivan, C. C. Bedford, E. Dehouck, H. E. Newsom, M. C. Malin
Icarus, 430, 116445. doi:10.1016/j.icarus.2024.116445
2025
Compositional diversity in pristine Bennu samples revealed by the IR hyperspectral microscope MicrOmega at JAXA Curation Center and comparison with Ryugu samples
C. Pilorget, T. Okada, J.-P. Bibring, D. Loizeau, K. Hatakeda, L. Nardelli, L. Riu, R. Y. Sheppard, T. Jiang, M. Mahlke, R. Brunetto, R. Fukai, M. Abe, A. Aleon-Toppani, D. Baklouti, Y. Enokido, V. Hamm, S. Kawasaki, C. Lantz, A. Miyazaki, A. Moussi-Soffys, M. Nishimura, F. Poulet, R. Tahara, T. Usui, T. Yada, K. Yogata
Nature Communications, 16:9532. doi:10.1038/s41467-025-65438-z
2024
Simulated Fe/Mg-silicate chimneys as analogs to saponite-rich hydrothermal systems on early Earth and Mars
N. A. Carman, E. M. Hausrath, A. Celestian, J. Chavez, N. Hermis, D. E. LaRowe, A. Fraeman, R. Y. Sheppard, C. T. Adcock, O. Tschauner, E. B. Rampe, R. Price, L. M. Barge
ACS Earth & Space Chemistry, 8(10), 1982–1996. doi:10.1021/acsearthspacechem.4c00109
2024
An orbital comparison of a late mantling unit on Aeolis Mons with other erosion-resistant strata explored by MSL in Gale crater, Mars
A. Rudolph, B. Horgan, K. Bennett, C. Weitz, R. Y. Sheppard, L. Scuderi, A. Bryk, K. Lewis, A. Roberts
Journal of Geophysical Research: Planets. 129, e2023JE008242. doi:10.1029/2023JE008242
2024
A Mastcam multispectral investigation of rock variability in Gale crater, Mars: Implications for alteration in the clay-sulfate transition of Mount Sharp
A. M. Eng, M. S. Rice, W. H. Farrand, J. R. Johnson, S. Jacob, E. B. Rampe, L. M. Thompson, D. Applin, J. Bishop, E. Cloutis, M. Gabbert, K. Lapo, A. Rudolph, C. Seeger, R. Sheppard
Journal of Geophysical Research: Planets. 129, 2. doi:10.1029/2023JE008033
2024
The geological context and significance of the clay-sulfate transition region in Mount Sharp, Gale crater, Mars: An integrated assessment based on orbiter and rover data
M. J. Meyer, R. E. Milliken, K. M. Stack Morgan, L. A. Edgar, E. B. Rampe, M. L. Turner, K. W. Lewis, E. S. Kite, G. Caravaca, A. R. Vasavada, W. E. Dietrich, A. B. Bryk, O. Gasnault, S. Le Mouelic, C. H. Seeger, R. Y. Sheppard
GSA Bulletin, doi:10.1130/B37355.1
2022
Chirality in organic and mineral systems: A review of reactivity and alteration processes relevant to prebiotic chemistry and life detection missions
C. Lee, J. M. Weber, L. E. Rodriguez, R. Y. Sheppard, L. M. Barge, E. L. Berger, A. S. Burton
Symmetry special issue, “Chirality, Prebiotic Chemistry, and the Origins of Life.” 14(3), 460. doi:10.3390/sym14030460
2021
Merging perspectives on secondary minerals on Mars: A review of ancient water-rock interactions in Gale crater inferred from orbital and in situ observations
R. Y. Sheppard, M. T. Thorpe, A. A. Fraeman, V. K. Fox, R. E. Milliken
Minerals special issue, “Expanding Views of Clays, Oxides, and Evaporites on Aquaplanets in the Solar System,” 11(986). doi:10.3390/min11090986
2021
Iron mineralogy and sediment color in a 100 m drill core from Lake Towuti, Indonesia reflect catchment and diagenetic conditions
R. Y. Sheppard, R. E. Milliken, J. M. Russell, M. D. Dyar, E. Sklute, H. Vogel, M. Melles, S.
Bijaksana, A. K. M. Hasberg, M. A. Morlock
Geochemistry, Geophysics, Geosystems. 22, e2020GC009582. doi:10.1029/2020GC009582
2020
The Late Quaternary tectonic, bio-geochemical, and environmental evolution of ferruginous Lake Towuti, Indonesia
J. Russell, H. Vogel, S. Bijaksana, M. Melles, A. Deino, A. Hafidz, A. Hasberg†, M. Morlock, T. von Rintelen, R. Y. Sheppard, B. Stelbrink, J. Stevenson
Palaeogeography, Palaeoclimatology, Palaeoecology. 556, 109905. doi:10.1016/j.palaeo.2020.109905
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