Vibrational spectroscopic study of minerals in the Martian meteorite ALH 84001
Abstract
Micro-Raman spectra of carbonates, silica and amorphous plagioclase, and both micro-Raman and IR reflectance spectra of phosphates in ALH84001 are reported. Data from these vibrational techniques combined with electron microprobe analyses show that (1) the carbonates exhibit complex compositional heterogeneity on a sub-micrometer scale, (2) the phosphates, chlorapatite and merrillite, are largely anhydrous, (3) amorphous silica and plagioclase experienced peak shock pressures >32 GPa and >50 GPa, respectively, and (4) vitreous plagioclase was quenched from a shock- induced melt after relaxation of the peak shock pressure. The observed general Raman band broadening of lattice and internal modes of carbonates in ALH84001 indicates complex sub-microscopic compositional heterogeneity and possibly structural disorder. Any search for biogenic markers in ALH84001 must recognize the complex shock and thermal history of these minerals.
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The lower wavenumber peaks of hematite may also have been misinterpreted as magnetite.
“The lower wavenumber peaks of hematite may also have been misinterpreted as magnetite (Cooney et al. 1999).”
From Comprehensive imaging and Raman spectroscopy of carbonate globules from Martian meteorite ALH 84001 and a terrestrial analogue from Svalbard (2007) · cites this paper as Cooney et al. 1999
Previous Raman spectroscopic studies conducted on ALH 84001 failed to detect hematite.
“Previous Raman spectroscopic studies conducted on ALH 84001 failed to detect hematite (Cooney et al. 1999;Bell et al. 1999).”
From Comprehensive imaging and Raman spectroscopy of carbonate globules from Martian meteorite ALH 84001 and a terrestrial analogue from Svalbard (2007) · cites this paper as Cooney et al. 1999
Cites
Discrimination among Carbonate Minerals by Raman Spectroscopy Using the Laser Microprobe
Herman, R. G., Bogdan, C. E., Sommer, A. J., & Simpson, D. R. (1987) · Applied Spectroscopy · doi:10.1366/0003702874448841 · Cited by 130 · see citing works
Correlated chemical and isotopic zoning in carbonates in the martian meteorite ALH84001
Saxton, J. M., Lyon, I. C., & Turner, G. (1998) · Earth and Planetary Science Letters · doi:10.1016/s0012-821x(98)00129-0 · Cited by 39 · see citing works
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Steele, A., Fries, M. D., Amundsen, H. E. F., Mysen, B. O., Fogel, M. L., Schweizer, M., & Boctor, N. Z. (2007) · Meteoritics & Planetary Science · doi:10.1111/j.1945-5100.2007.tb00590.x · Cited by 117 · see citing works
- Authors
- Cooney, T. F., Scott, E. R. D., Krot, A. N., Sharma, S. K., & Yamaguchi, A.
- Affiliations
- University of Hawaiʻi at Mānoa (US)
- Corresponding author
- Sharma, S. K.
- Venue
- American Mineralogist
- Publisher
- Mineralogical Society of America
- Published
- 1999-10-01
- Volume
- 84
- Issue
- 10
- Pages
- 1569-1576
- ISSN
- 0003-004X (ISSN-L)
- OpenAlex
- W2134883152
- Cited by
- 84
- References
- 2
- Citations by year
- 2024: 2 · 2023: 2 · 2022: 3 · 2021: 1 · 2020: 3 · 2019: 7 · 2018: 4 · 2017: 5 · 2016: 4 · 2015: 3 · 2014: 3 · 2013: 2 · 2012: 3
- FWCI
- 3.28
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- American Mineralogist (publishedVersion)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Planetary Science and Exploration
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Mineralogy and Gemology Studies
- Keywords
- ALH84001, Martian meteorites, carbonates, chlorapatite, merrillite, amorphous silica, shock metamorphism, compositional heterogeneity, Raman band broadening, structural disorder
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