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Isotopic Evidence for a Terrestrial Source of Organic Compounds Found in Martian Meteorites Allan Hills 84001 and Elephant Moraine 79001
Abstract
Stepped-heating experiments on martian meteorites Allan Hills 84001 (ALH84001) and Elephant Moraine 79001 (EETA79001) revealed low-temperature (200 to 430 degrees Celsius) fractions with a carbon isotopic composition delta13C between -22 and -33 per mil and a carbon-14 content that is 40 to 60 percent of that of modern terrestrial carbon, consistent with a terrestrial origin for most of the organic material. Intermediate-temperature (400 to 600 degrees Celsius) carbonate-rich fractions of ALH84001 have delta13C of +32 to +40 per mil with a low carbon-14 content, consistent with an extraterrestrial origin, whereas some of the carbonate fraction of EETA79001 is terrestrial. In addition, ALH84001 contains a small preterrestrial carbon component of unknown origin that combusts at intermediate temperatures. This component is likely a residual acid-insoluble carbonate or a more refractory organic phase.
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“Indigenous MMC, which may include PAHs, has been found within ALH 84001 (Becker et al. 1999;Clemett et al. 1998;Jull et al. 1998;McKay et al. 1996).”
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 Jull et al. 1998
In the citing paper
“Therefore, a significant portion of the organic carbon in ALH 84001 probably exists as a macromolecular phase”
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 Jull et al. 1998
Citations
Cites
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Stable isotopic measurements of the low‐temperature nitrogen components in ALH 84001
Wright, I., Grady, M., & Pillinger, C. (1999) · doi:10.1029/1998je900023 · Cited by 5
The Abiotic Generation of Homochirality on Saturn’s Moon Titan
Lunine, J. I., Beauchamp, J. L., Smith, M. A., & Николаев, Е. Н. (1999) · Elsevier eBooks · doi:10.1016/b978-008043404-9/50017-6 · Cited by 4
Jull, A. J. T., Lal, D., Taylor, S., Wieler, R., Grimberg, A., Vacher, L., McHargue, L. R., Freeman, S., Maden, C., Schnabel, C., et al. (2007) · doi:10.1111/j.1945-5100.2007.tb00541.x · Cited by 4
“…at <200, 200–400, 400–550, and 550–800 °C, followed by fusing the sample with Fe chips in an alumina crucible that had an oxygen atmosphere at T > 800 °C. Heating the >800 °C extractions was achieved using a radio-frequency (RF) induction furnace, similar to that described by Jull et al. (1998).”
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“Competing theories include terrestrial contamination (Jull et al., 1998: Stephan et al., 2003), abiotic geophysical processes (Treiman, 2003; Zolotov and Shock, 2000; Steele et al., 2007) and the detritus of past life (McKay, 1996).”
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“…al., 1996, Brasier et al., 2002; Fedo and Whitehouse, 2002; Schopf et al., 2002) and the continuing discussions over possible evidence of biogenic activities in Martian meteorite ALH84001 (McKay et al., 1996; Jull et al., 1998; Golden et al., 2000; Steele et al., 2000; Thomas-Keprta et al., 2001).”
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“This carbon component could be an inorganic carbonate phase or a high molecular weight organic component, but it still remains uncharacterized ( Jull et al., 1998; Becker et al., 1999).”
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“…(Becker et al., 1999), thermal decomposition of carbonate minerals (Steele et al., 2007; Treiman, 2003; Zolotov and Shock, 2000), aqueous precipitation (Steele et al., 2007), terrestrial contamination (Jull et al., 1998; Stephan et al., 2003) and the remnants of ancient biota (McKay et al., 1996).”
BackgroundWierman, M., Chin, W. W., Clemmons, D. R., Gagel, R. F., & Larsen, J. L. (2015) · Endocrine reviews · doi:10.1210/edrv-er.2015-1072
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Doh, S., & Yu, Y. (2010) · Journal of The Korean Astronomical Society · doi:10.5303/jkas.2010.43.6.183
“That is why terrestrial residence dating (10Be, 14C, 36Cl) is necessary to infer the freshness of meteorites (Jull et al. 1990, 1997, 1998; Nishiizumi et al. 1988, 1989, 1991; Vogt et al. 1990).”
BackgroundSurface Science of the Terrestrial Planets
Milone, E., & Wilson, W. (2014) · Astronomy and astrophysics library · doi:10.1007/978-0-387-73155-1_9
Metadata
- Authors
- Jull, A. J. T., Courtney, C., Jeffrey, D. A., & Beck, J. W.
- Affiliations
- U.S. National Science Foundation (US)
- ORCID
- Beck, J. W.
- Venue
- Science
- Published
- 1998-01-16
- Volume
- 279
- Issue
- 5349
- Pages
- 366-369
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W1991009883
- Cited by
- 159
- References
- 0
- Citations by year
- 2026: 1 · 2025: 3 · 2024: 2 · 2023: 4 · 2022: 3 · 2021: 4 · 2020: 1 · 2019: 1 · 2018: 4 · 2016: 3 · 2015: 4 · 2014: 5 · 2013: 5 · 2012: 7
- FWCI
- 10.86
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Science (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Space and Planetary Science › Planetary Science and Exploration
- Physical Sciences › Earth and Planetary Sciences › Space and Planetary Science › Astro and Planetary Science
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Keywords
- Martian meteorites, ALH84001, organic compounds, terrestrial contamination, carbon isotopes, carbon-14, carbonates
- MeSH terms
- Carbon, Carbon Dioxide, Carbon Isotopes, Carbon Radioisotopes, Carbonates, Hot Temperature, Organic Chemicals, Silicates, Mars, Meteoroids
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