Abstract
THE recent discovery that CO2 at upper mantle pressures has a dramatic effect on the melting temperature of peridotite (because the silicate assemblage becomes carbonated), and on the composition of near-solid us liquid, has petrological and geophysical implications that have been explored extensively. The influence of H2O has received only passing reference, probably because it was tacitly assumed that this would modify the carbonate-dominated melting relationships significantly. I describe here construction of a schematic diagram for the system peridotite–CO2–H2O which shows that the carbonate can persist even in the presence of vapours with high H2O/CO2 Figure 1 shows that starting with peridotite–H2O at high pressures, a small addition of CO2 is sufficient for the generation of carbonate. This leads to the unexpected conclusion that many of the applications deduced for the melting of carbonated peridotite may remain valid with vapours enriched in H2O/CO2 In particular, the interstitial liquid in the upper part of the seismic low-velocity zone may be carbonatitic even with H2O present as a component.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Wyllie, P. J. & Tuttle, O. F. Am. J. Sci. 257, 648 (1959).
Mysen, B. O., Eggler, D. H., Seitz, M. G. & Holloway, J. R. Am. J. Sci. 276, 455 (1976).
Wyllie, P. J. & Huang, W. L. Nature 257, 297 (1975).
Wyllie, P. J. & Huang, W. L. Geology 3, 621 (1975).
Wyllie, P. J. & Huang, W. L. Contr. Miner. Petrol. 54, 79 (1976).
Eggler, D. H. Geology 4, 69 (1976).
Wyllie, P. J. & Huang, W. L. Geology 4, 21 (1976).
Eggler, D. H., Holloway, J. R. & Mysen, B. O., Wyllie, P. J. & Huang, W. L. Geology 4, 198 (1976).
Boettcher, A. L. Rev. Geophys. Space Phys. 13, 75 (1975).
Mysen, B. O. & Boettcher, A. L. J. Petrol. 16, 520, 549 (1975).
Irving, A. J. & Wyllie, P. J. Geochim. cosmochim. Acta 39, 35 (1975).
Kushiro, I. J. Petrol. 13, 311 (1972).
Eggler, D. H. Physics Chem. Earth 9, 869 (1975).
Kerrick, D. M. Am. Mineral. 59, 729 (1974).
Greenwood, H. J. Am. J. Sci. 275, 573 (1975).
Wyllie, P. J. & Haas, J. L. Geochim. cosmochim. Acta 29, 871 (1965).
Wyllie, P. J. & Haas, J. L. Geochim. cosmochim. Acta 30, 525 (1966).
Boettcher, A. L. & Wyllie, P. J. Geochim. cosmochim. Acta 33, 611 (1969).
Boyd, F. R. & Nixon, P. H. in Lesotho Kimberlites (ed. Nixon, P. H.) 254, (Maseru, Lesotho National Development Corporation, 1973).
Franz, G. W. & Wyllie, P. J. in Ultramafic and Related Rocks (ed. Wyllie, P. J.) 323 (Wiley, New York, 1967).
Wyllie, P. J. J. Geol. (in the press).
Evans, B. W. & Trommsdorff, V. Am. J. Sci. 274, 274 (1974).
Kushiro, I., Syono, Y. & Akimoto, S. J. geophys. Res. 73, 6023 (1968).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
WYLLIE, P. Peridotite–CO2–H2O, and carbonatitic liquids in the upper asthenosphere. Nature 266, 45–47 (1977). https://doi.org/10.1038/266045a0
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1038/266045a0
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.