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Oxygen-isotope evidence for recycled crust in the sources of mid-ocean-ridge basalts

Eiler, John M. and Schiano, Pierre and Kitchen, Nami and Stolper, Edward M. (2000) Oxygen-isotope evidence for recycled crust in the sources of mid-ocean-ridge basalts. Nature, 403 (6769). pp. 530-534. ISSN 0028-0836. doi:10.1038/35000553.

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Mid-ocean-ridge basalts (MORBs) are the most abundant terrestrial magmas and are believed to form by partial melting of a globally extensive reservoir of ultramafic rocks in the upper mantle. MORBs vary in their abundances of incompatible elements (that is, those that partition into silicate liquids during partial melting) and in the isotopic ratios of several radiogenic isotope systems. These variations define a spectrum between 'depleted' and 'enriched' compositions, characterized by respectively low and high abundances of incompatible elements. Compositional variations in the sources of MORBs could reflect recycling of subducted crustal materials into the source reservoir, or any of a number of processes of intramantle differentiation. Variations in ^(18)O/^(16)O (principally sensitive to the interaction of rocks with the Earth's hydrosphere) offer a test of these alternatives. Here we show that ^(18)O/^(16)O ratios of MORBs are correlated with aspects of their incompatible-element chemistry. These correlations are consistent with control of the oxygen-isotope and incompatible-element geochemistry of MORBs by a component of recycled crust that is variably distributed throughout their upper mantle sources.

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Stolper, Edward M.0000-0001-8008-8804
Additional Information:© 2000 Macmillan Magazines Ltd. Received 12 July 1999; Accepted 9 December 1999. We thank P. Michael; we also thank D. Anderson, P. Asimow, A. Halliday and C. Langmuir for comments on the manuscript. We thank the Chevron Corporation for donation of the mass spectrometer used for isotopic measurements.
Issue or Number:6769
Record Number:CaltechAUTHORS:20120822-113108532
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Official Citation:Eiler, J., Schiano, P., Kitchen, N. et al. Oxygen-isotope evidence for recycled crust in the sources of mid-ocean-ridge basalts. Nature 403, 530–534 (2000).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33450
Deposited On:22 Aug 2012 21:23
Last Modified:09 Nov 2021 21:34

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