Cited by 53Astro and Planetary SciencePlanetary Science and ExplorationHigh-pressure geophysics and materials

Experimental shock decomposition of siderite and the origin of magnetite in Martian meteorite ALH 84001

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BELL, M. S.·2007·Meteoritics & Planetary Science

Abstract

Abstract Shock recovery experiments to determine whether magnetite could be produced by the decomposition of iron‐carbonate were initiated. Naturally occurring siderite was first characterized by a variety of techniques to be sure that the starting material did not contain detectable magnetite. Samples were shocked in tungsten‐alloy holders (W = 90%, Ni = 6%, Cu = 4%) to further ensure that any iron phases in the shock products were contributed by the siderite rather than the sample holder. Each sample was shocked to a specific pressure between 30 to 49 GPa. Transformation of siderite to magnetite as characterized by TEM was found in the 49 GPa shock experiment. Compositions of most magnetites are >50% Fe+2 in the octahedral site of the inverse spinel structure. Magnetites produced in shock experiments display the same range of sizes (˜50–100 nm), compositions (100% magnetite to 80% magnetite‐20% magnesioferrite), and morphologies (equant, elongated, euhedral to subhedral) as magnetites synthesized by Golden et al. (2001) and as the magnetites in Martian meteorite Allan Hills (ALH) 84001. Fritz et al. (2005) previously concluded that ALH 84001 experienced ˜32 GPa pressure and a resultant thermal pulse of ˜100–110°C. However, ALH 84001 contains evidence of local temperature excursions high enough to melt feldspar, pyroxene, and a silica‐rich phase. This 49 GPa experiment demonstrates that magnetite can be produced by the shock decomposition of siderite as a result of local heating to > 470°C. Therefore, magnetite in the rims of carbonates in Martian meteorite ALH 84001 could be a product of shock devolatilization of siderite as well.

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Crossref · 10.1111/j.1945-5100.2007.tb01142.x

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Authors
BELL, M. S.
Affiliations
Johnson Space Center (US)
Corresponding author
BELL, M. S.
Venue
Meteoritics & Planetary Science
Publisher
Wiley
Published
2007-06
Volume
42
Issue
6
Pages
935-949
ISSN
  • 1086-9379 (ISSN-L)
  • 1945-5100
OpenAlex
W2034511687
Cited by
53
References
51
Citations by year
2026: 2 · 2025: 4 · 2024: 4 · 2023: 1 · 2022: 1 · 2021: 2 · 2019: 16 · 2018: 2 · 2017: 4 · 2016: 2 · 2014: 1 · 2013: 2 · 2012: 4
FWCI
1.20
Type
journal article
Language
en
Open access
Locations
  • Meteoritics and Planetary Science (publishedVersion)
  • UA Campus Repository (The University of Arizona) (acceptedVersion)
  • NASA STI Repository (National Aeronautics and Space Administration) (submittedVersion)
Funders
  • National Aeronautics and Space Administration
  • Johnson Space Center
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Planetary Science and Exploration
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › High-pressure geophysics and materials
Keywords
siderite, magnetite, shock metamorphism, shock decomposition, ALH84001, Martian meteorites, high-pressure shock experiments, inverse spinel structure

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