A New Constraint on the Physicochemical Condition of Mars Surface during the Amazonian Epoch Based on Chemical Speciation for Secondary Minerals in Martian Nakhlites
Iddingsite in Martian nakhlites contains various secondary minerals that reflect water–rock interaction on Mars. However, the formation processes of secondary Fe minerals in iddingsite are unclear because they include carbonates precipitated under reductive and alkaline conditions and sulfates that...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-05-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/11/5/514 |
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| author | Hiroki Suga Keika Suzuki Tomohiro Usui Akira Yamaguchi Oki Sekizawa Kiyofumi Nitta Yasuo Takeichi Takuji Ohigashi Yoshio Takahashi |
| author_facet | Hiroki Suga Keika Suzuki Tomohiro Usui Akira Yamaguchi Oki Sekizawa Kiyofumi Nitta Yasuo Takeichi Takuji Ohigashi Yoshio Takahashi |
| author_sort | Hiroki Suga |
| collection | DOAJ |
| description | Iddingsite in Martian nakhlites contains various secondary minerals that reflect water–rock interaction on Mars. However, the formation processes of secondary Fe minerals in iddingsite are unclear because they include carbonates precipitated under reductive and alkaline conditions and sulfates that are generally precipitated under oxidative and acidic conditions. Mineral types cannot coexist under equilibrium. Herein, we characterize the carbonate phase of meteorite Yamato 000593 as siderite and Mn-bearing siderite via field-emission electron probe microanalyzer (FE-EPMA). Then, we examined the distribution and speciation of trace Cr and S within the carbonates through synchrotron micro-focused X-ray fluorescence-X-ray absorption fine structure and scanning transmission X-ray microscopy (μ-XRF-XAFS/STXM) analysis to estimate the transition history of Eh-pH conditions during siderite formation to explain the coexistence of carbonate and sulfate phases in the nakhlite vein. Specifically, the distribution and speciation of S in the mesostasis and carbonate phases and the heterogeneous distribution of Mn-FeCO<sub>3</sub> incorporating Cr(III) in the carbonate constrain the Eh-pH condition. The conditions and transition of the fluid chemistry determined herein based on speciation of various elements provide a new constraint on the physicochemical condition of the water that altered the nakhlite body during the Amazonian epoch. |
| first_indexed | 2024-03-10T11:27:20Z |
| format | Article |
| id | doaj.art-f2448c70be064d7c8adc7c448b229c92 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T11:27:20Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-f2448c70be064d7c8adc7c448b229c922023-11-21T19:35:17ZengMDPI AGMinerals2075-163X2021-05-0111551410.3390/min11050514A New Constraint on the Physicochemical Condition of Mars Surface during the Amazonian Epoch Based on Chemical Speciation for Secondary Minerals in Martian NakhlitesHiroki Suga0Keika Suzuki1Tomohiro Usui2Akira Yamaguchi3Oki Sekizawa4Kiyofumi Nitta5Yasuo Takeichi6Takuji Ohigashi7Yoshio Takahashi8Spectroscopy and Imaging Division, Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), Hyogo 679-5198, JapanDepartment of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, JapanInstitute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Kanagawa 252-5210, JapanNational Institute of Polar Research, Tokyo 190-8518, JapanSpectroscopy and Imaging Division, Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), Hyogo 679-5198, JapanSpectroscopy and Imaging Division, Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), Hyogo 679-5198, JapanInstitute of Materials Structure Science, High-Energy Accelerator Research Organization, Ibaraki 305-0801, JapanUVSOR facility, Institute for Molecular Science, Okazaki 444-8585, JapanDepartment of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, JapanIddingsite in Martian nakhlites contains various secondary minerals that reflect water–rock interaction on Mars. However, the formation processes of secondary Fe minerals in iddingsite are unclear because they include carbonates precipitated under reductive and alkaline conditions and sulfates that are generally precipitated under oxidative and acidic conditions. Mineral types cannot coexist under equilibrium. Herein, we characterize the carbonate phase of meteorite Yamato 000593 as siderite and Mn-bearing siderite via field-emission electron probe microanalyzer (FE-EPMA). Then, we examined the distribution and speciation of trace Cr and S within the carbonates through synchrotron micro-focused X-ray fluorescence-X-ray absorption fine structure and scanning transmission X-ray microscopy (μ-XRF-XAFS/STXM) analysis to estimate the transition history of Eh-pH conditions during siderite formation to explain the coexistence of carbonate and sulfate phases in the nakhlite vein. Specifically, the distribution and speciation of S in the mesostasis and carbonate phases and the heterogeneous distribution of Mn-FeCO<sub>3</sub> incorporating Cr(III) in the carbonate constrain the Eh-pH condition. The conditions and transition of the fluid chemistry determined herein based on speciation of various elements provide a new constraint on the physicochemical condition of the water that altered the nakhlite body during the Amazonian epoch.https://www.mdpi.com/2075-163X/11/5/514nakhliteμ-XRF-XAFSchemical speciationMarsmartian wateraqueous alteration |
| spellingShingle | Hiroki Suga Keika Suzuki Tomohiro Usui Akira Yamaguchi Oki Sekizawa Kiyofumi Nitta Yasuo Takeichi Takuji Ohigashi Yoshio Takahashi A New Constraint on the Physicochemical Condition of Mars Surface during the Amazonian Epoch Based on Chemical Speciation for Secondary Minerals in Martian Nakhlites Minerals nakhlite μ-XRF-XAFS chemical speciation Mars martian water aqueous alteration |
| title | A New Constraint on the Physicochemical Condition of Mars Surface during the Amazonian Epoch Based on Chemical Speciation for Secondary Minerals in Martian Nakhlites |
| title_full | A New Constraint on the Physicochemical Condition of Mars Surface during the Amazonian Epoch Based on Chemical Speciation for Secondary Minerals in Martian Nakhlites |
| title_fullStr | A New Constraint on the Physicochemical Condition of Mars Surface during the Amazonian Epoch Based on Chemical Speciation for Secondary Minerals in Martian Nakhlites |
| title_full_unstemmed | A New Constraint on the Physicochemical Condition of Mars Surface during the Amazonian Epoch Based on Chemical Speciation for Secondary Minerals in Martian Nakhlites |
| title_short | A New Constraint on the Physicochemical Condition of Mars Surface during the Amazonian Epoch Based on Chemical Speciation for Secondary Minerals in Martian Nakhlites |
| title_sort | new constraint on the physicochemical condition of mars surface during the amazonian epoch based on chemical speciation for secondary minerals in martian nakhlites |
| topic | nakhlite μ-XRF-XAFS chemical speciation Mars martian water aqueous alteration |
| url | https://www.mdpi.com/2075-163X/11/5/514 |
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