Abstract
MODELS of magma genesis at mid-ocean ridges1, together with recent experimental data2 and observations of trace element abundances in clinopyroxenes from abyssal peridotites3, suggest that small-volume melt fractions can be efficiently extracted from the melting mantle. As shown in ref. 3, residues of this type of melting (fractional melting) display extremely low abundances of incompatible trace elements and extreme fractionation amongst them, especially at advanced stages of the process because of the compounded effects of differences in the partition coefficients. If this process operates beneath mid-ocean ridges, one would expect to sample melts that are correspondingly depleted and fractionated in trace elements. Indeed, the existence of very depleted melts in mid-ocean ridges was predicted previously4–6 in order to explain the presence of magnesian pyroxene and calcic plagioclase in mid-ocean-ridge basalts. We report here the discovery of melt that has major and trace element characteristics consistent with these predictions4–6, occurring as an inclusion in an olivine phenocryst in a typical mid-ocean-ridge basalt from the Mid-Atlantic Ridge. Although our preferred model for the origin of this 'ultra-depleted' melt is critical (continuous) melting, we cannot at this stage rule out other models. Our results underscore the importance of trapped melt inclusions as recorders of the processes involved in melting and melt extraction, and also as pointers to primary melt compositions.
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
McKenzie, D. Earth planet. Sci. Lett. 72, 149–157 (1985).
Riley, G. N. & Kohlstedt, D. L. Earth planet. Sci. Lett. 105, 500–521 (1991).
Johnson, K. T., Dick, H. J. B. & Shimizu, J. geophys. Res. 95, 2661–2678 (1990).
Green, D. H., Hibberson, W. O. & Jaques, A. L. in The Earth: Its Origin, Structure and Evolution (ed. McElhinny, M. W.) 265–290 (Academic, 1979).
Duncan, R. A. & Green, D. H. Geology, 8, 22–26 (1980).
Duncan, R. A. & Green, D. H. Contrib. Miner. Petrol. 96, 326–342 (1987).
Sobolev, A. V., Danyuchevskiy, L. V., Dimitriev, L. V. & Sushchevskaya, N. M. Geochem. int. 26, 128–133 (1989).
Danyushevskiy, L. V., Sobolev, A. V. & Dimitriev, L. V. Trans. USSR Acad. Sci. Earth Sci. Sec. 292, 102–105 (1988).
Roedder, E. Rev. Mineral. 12 (1984).
Ford, C. E., Russell, D. G., Craven, J. A. & Fisk, M. R. J. Petrol. 24, 256–265 (1983).
Kilinc, A., Carmichael, I. S. E., Rivers, M. L. & Sack, R. J. Contrib. Miner. Petrol. 83, 136–140 (1983).
Shimizu, N. & Hart, S. R. A. Rev. Earth planet. Sci. 10, 483–526 (1982).
Hofmann, A. W. Earth planet. Sci. Lett. 90, 297–314 (1988).
Kinzler, R. J. & Grove, T. L. J. geophys. Res. 97, 6885–6906 (1992).
Dick, H. J. B. thesis, Yale Univ. (1976).
Langmuir, C. H., Bender, J. R., Bence, A. E., Hanson, G. N. & Taylor, S. R. Earth planet. Sci. Lett. 36, 133–156 (1977).
Maaloe, S. Geochim. cosmochim. Acta 46, 43–57 (1982).
Anders, E. & Grevesse, N. Geochim. cosmochim. Acta 53, 197–214 (1989).
Falloon, T., Green, D. H., Hatton, C. J. & Harris, K. L. J. Petrol 29, 1257–1282 (1988).
Falloon T. & Green, D. H. J. Petrol. Spec. Lithosphere Issue, 379–414 (1988).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Sobolev, A., Shimizu, N. Ultra-depleted primary melt included in an olivine from the Mid-Atlantic Ridge. Nature 363, 151–154 (1993). https://doi.org/10.1038/363151a0
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/363151a0
This article is cited by
-
Olivine and melt inclusion chemical constraints on the nature and origin of the common mantle component beneath eastern Asia
Contributions to Mineralogy and Petrology (2022)
-
Mixing between chemically variable primitive basalts creates and modifies crystal cargoes
Nature Communications (2021)
-
Deep roots for mid-ocean-ridge volcanoes revealed by plagioclase-hosted melt inclusions
Nature (2019)
-
Crystal scavenging from mush piles recorded by melt inclusions
Nature Communications (2019)
-
Ubiquitous ultra-depleted domains in Earth’s mantle
Nature Geoscience (2019)
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.