Nature Publishing Group, publisher of Nature, and other science journals and reference works
Nature
my account e-alerts subscribe register
   
Saturday 21 October 2017
Journal Home
Current Issue
AOP
Archive
Download PDF
References
Export citation
Export references
Send to a friend
More articles like this

Letters to Nature
Nature 379, 701 - 703 (22 February 1996); doi:10.1038/379701a0

Early aqueous activity on primitive meteorite parent bodies

Magnus Endress*, Ernst Zinner & Adolf Bischoff*

* Institute of Planetology, University of Münster, Wilhelm-Klemm-Strasse 10, 48149 Münster, Germany
McDonnell Center for the Space Sciences and Physics Department, Washington University, St Louis, Missouri 63130, USA
To whom correspondence should be addressed.

THE interstellar material from which the Solar System formed has been modified by many processes1: evaporation and condensation in the solar nebula, accretion into protoplanetary bodies and post-accretion processes within these bodies. Meteorites provide a record of these events and their chronology2. Carbonaceous CI chondrites are among the most primitive, undifferen-tiated meteorites3–6, but nevertheless show evidence of post-accretion alteration7; they contain carbonates that are believed to have formed by reactions between anhydrous CI precursor materials and circulating fluids in the meteorite parent body (or bodies), yet little is known about the nature of these reactions or the timescale on which they occurred. Here we report measurements of excess 53Cr—formed by the decay of short-lived 53Mn— in five carbonate fragments from the CI chondrites Orgueil and Ivuna. Our results show that aqueous alteration on small protoplanetary bodies must have begun less than 20 Myr after the time of formation of the oldest known solar-nebula condensates2 (Allende refractory inclusions). This upper limit is much shorter than that of 50 Myr inferred from previous studies8, and clearly establishes aqueous alteration as one of the earliest processes in the chemical evolution of the Solar System.

------------------

References

1. Meteorites and the Early Solar System (Kerridge, J. F. & Matthews, M. S. (eds.)) (Univ. Arizona Press, Tucson, 1988).
2. Tilton, G. R. in Meteorites and the Early Solar System (eds Kerridge, J. F. & Matthews, M. S.) 259−275 (Univ. Arizona Press, Tucson, 1988).
3. Scott, E. R. D. Barber, D. J., Alexander, C. M., Hutchinson, R. & Peck, J. A. in Meteorites and the Early Solar system (eds Kerridge, J. F. & Matthews, M. S.) 718−745 (Univ. Arizona Press, Tucson, 1988).
4. Zinner, E. in Meteorites and the Early Solar System (eds Kerridge, J.F. & Matthews, M. S.) 956−983 (Univ. Arizona Press, Tucson, 1988).
5. Anders, E. & Zinner, E. Meteoritics 28, 490−514 (1993). | ISI | ChemPort |
6. Ott, U. Nature 364, 25−33 (1993). | Article | ISI | ChemPort |
7. Richardson, S. M. Meteoritics 13, 141−159 (1978). | ChemPort |
8. Macdougall, J. D., Lugmair, G. W. & Kerridge, J. F. Nature 307, 249−251 (1984). | Article | PubMed | ISI | ChemPort |
9. MacPherson, G. J., Davis, A. M. & Zinner, E. K. Meteoritics 30, 365−386 (1995). | ISI | ChemPort |
10. Birck, J.-L. & Allègre, C. J. Nature 331, 579−584 (1988). | Article | ChemPort |
11. Lugmair, G. W., Maclsaac, C. & Shukolyukov, A. Lunar planet. Sci. XXV, 813−814 (1994).
12. Fredriksson, K. & Kerridge, J. F. Meteoritics 23, 35−44 (1988). | PubMed | ChemPort |
13. Endress, M. & Bischoff, A. Geochim. cosmochim. Acta 60, 489−507 (1996). | PubMed | ChemPort |
14. Macdougall, J. D. & Lugmair, G. W. Meteoritics 24, 297 (1989).
15. Scatena-Wachel, D. E., Hinton, R. W. & Davis, A. M. Lunar planet Sci. XV, 718−719 (1984).
16. Endress, M., Zinner, E., Weber, D. & Bischoff, A. Meteoritics 29, 463 (1994).
17. Podosek, F. A. et al. Geochim. cosmochim. Acta 55, 1083−1110 (1991). | Article | ChemPort |
18. Lugmair, G. W., Maclsaac, C. & Shukolyukov, A. Lunar planet. Sci. XXIII, 823−824 (1992).
19. Manhès, G., Göpel, C. & Allègre, C. J. in Comptes Rendus de l'ATP Planètologie (eds Festou. M. C. & Chabod, D.) 323−327 (Observatoire de Besançon, 1988).
20. Hutcheon, I. D. & Olsen, E. Lunar planet. Sci. XXII, 605−606 (1991).
21. Lugmair. G. W. & Maclsaac, C. Lunar planet. Sci. XXVI, 879−880 (1995).



© 1996 Nature Publishing Group
Privacy Policy