Download file (2.35MB)
Download as zip (2.1MB)

コレクション

引用

説明:

Molecular hydrogen is an important gas species for understanding the early Martian climate and redox chemistry. Through ancient aqueous alterations of crustal rocks, ferrous (Fe(II)) saponite formed abundantly on Mars. Subsequent intrusions of hydrothermal fluids may have resulted in the chemical reaction between the dissolved volatiles and the nearby rocks. Here we propose a new H₂ generating reaction between ferrous saponite and H₂S-containing fluids, possible on early Mars. A series of hydrothermal experiments at a relatively low temperature of 90°C were performed under anoxic conditions using synthesized ferrous saponite to compare the resulting H₂ concentration among various gas and fluid compositions. Based on the relationship with the existence of H₂S, reaction time, fluid pH, dissolved iron concentration, and amount of minerals, we found that high levels of H₂ (~0.1 mmol/g ferrous saponite) were generated in the presence of H₂S most rapidly in the moderate pH condition. Our microscopic chemical analysis of mineral phases suggested that ferrous saponite served as both the iron source of pyrite precipitation and the electron source to form H₂.

権利情報:

• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

キーワード: hydrothermal experiment, clay, hydrogen generation

刊行年月日: 2024-12-25

出版者: Wiley-Blackwell

掲載誌:

• JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS (ISSN: 21699097) vol. 130 issue. 1 e2024JE008538

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1029/2024JE008538

関連資料:

その他の識別子:

連絡先:

更新時刻: 2024-12-27 16:30:55 +0900

MDRでの公開時刻: 2024-12-28 08:30:36 +0900