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Yoshida H, Hasegawa H, Katsuta N, Maruyama I, Sirono S, Minami M, Asahara Y, Nishimoto S, Yamaguchi Y, Ichinnorov N, Metcalfe R. Fe-oxide concretions formed by interacting carbonate and acidic waters on Earth and Mars. Sci Adv 2018; 4:eaau0872. [PMID: 30525103 PMCID: PMC6281427 DOI: 10.1126/sciadv.aau0872] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/05/2018] [Accepted: 10/31/2018] [Indexed: 06/09/2023]
Abstract
Spherical Fe-oxide concretions on Earth, especially in Utah, USA, have been investigated as an analog of hematite spherules found in Meridiani Planum on Mars to support interpretations of water-rock interactions in early Mars. Although several formation mechanisms have been proposed for the Fe-oxide concretions on Earth, it is still unclear whether these mechanisms are viable because a precise formation process and precursor of the concretions are missing. This paper presents evidence that Fe-oxide concretions in Utah and newly found Fe-oxide concretions in Mongolia had spherical calcite concretions as precursors. Different formation stages of calcite and Fe-oxide concretions observed, both in Utah and Mongolia, indicate that calcite concretions initially formed within eolian sandstone strata and were dissolved by infiltrating Fe-rich acidic waters to form spherical FeO(OH) crusts due to pH buffering. The similarity between these Fe-oxide concretions on Earth and the hematite spherule occurrences in Meridiani Planum, combined with evidence of acid sulfate water influences on Mars, suggest that the hematite spherules also formed from dissolution of preexisting carbonate spherules possibly formed under a dense carbon dioxide early martian atmosphere.
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Affiliation(s)
- H. Yoshida
- Material Research Section, Nagoya University, University Museum, Nagoya, Japan
| | - H. Hasegawa
- Material Research Section, Nagoya University, University Museum, Nagoya, Japan
- Faculty of Science and Technology, Kochi University, Kochi, Japan
| | - N. Katsuta
- Faculty of Education, Gifu University, Gifu, Japan
| | - I. Maruyama
- Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan
| | - S. Sirono
- Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan
| | - M. Minami
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
| | - Y. Asahara
- Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan
| | | | - Y. Yamaguchi
- Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan
| | - N. Ichinnorov
- Institute of Paleontology and Geology, Mongolian Academy of Science, Mongolia
| | - R. Metcalfe
- Quintessa Limited, The Hub, Henley-on-Thames, Oxfordshire, UK
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Sirono S, Satomi K, Watanabe S. Numerical simulations of frictional melting: Small dependence of shear stress drop on viscosity parameters. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005jb003858] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- S. Sirono
- Earth and Environmental Sciences; Nagoya University; Aichi Japan
| | - K. Satomi
- Earth and Environmental Sciences; Nagoya University; Aichi Japan
| | - S. Watanabe
- Earth and Environmental Sciences; Nagoya University; Aichi Japan
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