# Hydrogen generation from ferrous saponite in reaction with H₂S-containing fluid: relevance to early Martian habitability

https://mdr.nims.go.jp/datasets/fec05e50-dda1-4dfd-bed0-1da85d2bcdff

## File

- [2025_Noda_et_al_JGRPlanets.pdf](https://mdr.nims.go.jp/filesets/47794f7a-7a93-4329-8459-60b4fc58a2d3/download) ([Detail](https://mdr.nims.go.jp/filesets/47794f7a-7a93-4329-8459-60b4fc58a2d3.md))

## Id

fec05e50-dda1-4dfd-bed0-1da85d2bcdff

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-12-27T00:20:53.678761Z

## Updated at

2024-12-27T07:30:55.877773Z

## Published at

2024-12-27T23:30:36.412013Z

## Doi



## First published url

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

## Date published

2024-12-25

## Recorded date published

2025-1

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: 'Hydrogen generation from ferrous saponite in reaction with H₂S-containing
    fluid: relevance to early Martian habitability'
  title_type: original
  lang: en

## Description

- description: '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. '
  description_type: abstract
  lang: eng

## Creator

- name: Natsumi Noda
  role: author
  organization: Institute of Science Tokyo
- name: Yasuhito Sekine
  role: author
  organization: Institute of Science Tokyo
- name: Yoshio Takahashi
  role: author
  organization: Graduate School of Science, The University fo Tokyo
- name: Keisuke Fukushi
  role: author
  organization: Kanazawa University
- name: Hiroshi Sakuma
  role: author
  orcid: https://orcid.org/0000-0002-6522-0704
  organization: National Institute for Materials Science
  department: Research Center for Electronic and Optical Materials/Functional Materials
    Field/Environmental Circulation Composite Materials Group
- name: Takahiro Kawai
  role: author
  organization: Graduate School of Science, The University fo Tokyo
- name: Mayuko Nakagawa
  role: author
  organization: Institute of Science Tokyo
- name: Norio KItadai
  role: author
  organization: Japan Agency for Marine-earth Science and Technology
- name: Kristin Johnson-Finn
  role: author
  organization: Institute of Science Tokyo
- name: Shawn Erin McGlynn
  role: author
  organization: Institute of Science Tokyo

## Contact agent



## Publisher

organization: Wiley-Blackwell

## Managing organization



## Keyword

- subject: hydrothermal experiment
  schema: not_defined
- subject: clay
  schema: not_defined
- subject: hydrogen generation
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by-nc/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
  issn: '21699097'
  volume: '130'
  issue: '1'
  article_number: e2024JE008538

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## Fileset

- id: 47794f7a-7a93-4329-8459-60b4fc58a2d3
  filename: 2025_Noda_et_al_JGRPlanets.pdf
  content_type: application/pdf
  size: 2459922
  md5: d8c8d877d14282cbb5206996b741d551

## Thumbnail

fileset_id: 47794f7a-7a93-4329-8459-60b4fc58a2d3
filename: 2025_Noda_et_al_JGRPlanets.pdf