Characterization of ferric hydroxysulfate on Mars and implications of the geochemical environment supporting its formation
Sulfate minerals are significant components of the martian surface and provide clues about the martian geochemical environment. One unusual Fe-sulfate phase has been intriguing Mars scientists for over a decade due to its unique spectral bands that are distinct from any known minerals and its occurrence in layered sedimentary rocks. We describe here detection of ferric hydroxysulfate (Fe<sup>3+</sup>SO<sub>4</sub>OH) and its implications for the geochemical history of Mars. Crystalline ferric hydroxysulfate is formed by heating hydrous Fe<sup>2+</sup> sulfates to 100 °C or above and has a strong spectral band at 2.236 µm, similar to the spectral feature observed on Mars at Aram Chaos and on the plateau above Juventae Chasma. Hydrated sulfates at these locations likely formed through evaporative processes or low-temperature alteration. In contrast, Fe<sup>3+</sup>SO<sub>4</sub>OH is more consistent with heating and oxidation of hydrated ferrous sulfates, potentially through deposition of lava, ash, or through hydrothermal processes.
Authors
- C. Gross (ORCID: https://orcid.org/0000-0003-3256-1868)
- C. M. Weitz (ORCID: https://orcid.org/0000-0002-4646-0825)
- Manfred Wildner (ORCID: https://orcid.org/0000-0003-1178-4122)
- T. F. Bristow (ORCID: https://orcid.org/0000-0001-6725-0555)
- T. Hiroi (ORCID: https://orcid.org/0000-0003-2866-9091)
- Alta Howells (ORCID: https://orcid.org/0000-0001-5700-7842)
- Arun M. Saranathan (ORCID: https://orcid.org/0000-0002-8926-1789)
- Johannes M. Meusburger (ORCID: https://orcid.org/0000-0003-4367-3566)
- M. Al-Samir
- M. Parente (ORCID: https://orcid.org/0000-0002-3552-2672)
- Dominik Talla (ORCID: https://orcid.org/0000-0002-8089-3632)
- J. L. Bishop (ORCID: https://orcid.org/0000-0002-6681-9954)
- Alessandro Maturilli (ORCID: https://orcid.org/0000-0003-4613-9799)
- B. Schmitt (ORCID: https://orcid.org/0000-0002-1230-6627)
- B. Lafuente (ORCID: https://orcid.org/0000-0002-2947-001X)
- Markus Gruendler
- Merve Yeşilbaş (ORCID: https://orcid.org/0000-0002-3830-7820)
- Yuki Itoh (ORCID: https://orcid.org/0000-0001-8255-1030)
Institutions
- Ames Research Center (US)
- Centre National de la Recherche Scientifique (FR)
- University of Vienna (AT)
- Planetary Science Institute (US)
- Goddard Space Flight Center (US)
- Johns Hopkins University (US)
- University of Massachusetts Amherst (US)
- Brown University (US)
- Johns Hopkins University Applied Physics Laboratory (US)
- Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR) (DE)
- University of California San Diego (US)
- Blue Marble Space (US)
- Science Systems and Applications (United States) (US)
- Blue Marble Space Institute of Science (US)
- Freie Universität Berlin (DE)
- Search for Extraterrestrial Intelligence (US)
- Université Grenoble Alpes (FR)
- Umeå University (SE)
Publication Details
- Journal
- Nature Communications
- Published
- 2025-08-05
- DOI
- https://doi.org/10.1038/s41467-025-61801-2
- Citations
- 3
- Primary Topic
- Planetary Science and Exploration
- Type
- article
- Field-Weighted Citation Impact
- 3.46