Atmosphere-Surface Interactions on Mars: Δ
17
O Measurements of Carbonate from ALH 84001
Author:
Farquhar James1, Thiemens Mark H.1, Jackson Teresa1
Affiliation:
1. Department of Chemistry, University of California San Diego, 92093–0356, USA.(J.F.), (M.H.T.), (T.J.)
Abstract
Oxygen isotope measurements of carbonate from martian meteorite ALH 84001 (δ
18
O = 18.3 ± 0.4 per mil, δ
17
O = 10.3 ± 0.2 per mil, and Δ
17
O = 0.8 ± 0.05 per mil) are fractionated with respect to those of silicate minerals. These measurements support the existence of two oxygen isotope reservoirs (the atmosphere and the silicate planet) on Mars at the time of carbonate growth. The cause of the atmospheric oxygen isotope anomaly may be exchange between CO
2
and O(
1
D) produced by the photodecomposition of ozone. Atmospheric oxygen isotope compositions may be transferred to carbonate minerals by CO
2
-H
2
O exchange and mineral growth. A sink of
17
O-depleted oxygen, as required by mass balance, may exist in the planetary regolith.
Publisher
American Association for the Advancement of Science (AAAS)
Subject
Multidisciplinary
Reference34 articles.
1. A. O. Nier, M. B. McElroy, Y. L. Yung, Science 194, 68 (1976); M. B. McElroy, Y. L. Yung, A. O. Nier, ibid., p. 70; A. O. Nier and M. B. McElroy, J. Geophys. Res. 82, 4341 (1977); M. K. Wallis, Planet. Space. Sci. 26, 949 (1978); Earth Planet. Sci. Lett. 93, 321 (1989); T. K. Owen, D. R. Biemann, J. E. Rushneck, D. W. Biller, Science 240, 1767 (1988); G. L. Bjoraaker, M. J. Mumma, H. P. Larson, Bull. Am. Astron. Soc. 29, 991 (1989); Krasnopolsky V. A., Mumma M. J., Bjoraker G. L., Jennings D. E., Icarus 553, 124 (1996). 2. Yung Y. L., et al., Icarus76, 146 (1988). 3. R. O. Pepin, ibid 111, 289 (1994); R. M. Haberle, D. Tyler, C. P. McKay, W. L. Davis, ibid. 109, 102 (1994); D. M. Kass, Y. L. Yung, Science 268, 697 (1995); K. S. Hutchins, B. M. Jakosky, J. Geophys. Res. 101, 14933 (1996) , I. P. Wright, M. M. Grady, C. T. Pillinger, ibid 95, 14789 (1990); B. M. Jakosky, Icarus 111, 271 (1994); Scambos T. A., Jakosky B. M., J. Geophys. Res. 95, 14779 (1990); C. A. Barth, in The Photochemistry of Atmospheres, J. S. Levine, Ed. (Academic Press, London, 1986), pp. 337–392. 4. A Photochemical Model of the Martian Atmosphere 5. Jakosky B. M., Geophys. Res. Lett.20, 1591 (1993); Icarus 94, 14 (1991).
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