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Oxygen isotope evidence against bulk recycled sediment in the mantle sources of Pitcairn Island lavas

Eiler, John M. and Farley, Kenneth A. and Valley, John W. and Stolper, Edward M. and Hauri, Eric H. and Craig, Harmon (1995) Oxygen isotope evidence against bulk recycled sediment in the mantle sources of Pitcairn Island lavas. Nature, 377 (6545). pp. 138-141. ISSN 0028-0836. doi:10.1038/377138a0.

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The hypothesis that subducted sediments survive dehydration and/or melting in subduction zones to become long-lived geo-chemical reservoirs in the mantle has gained support in recent years. Evidence for such reservoirs is found in the geochemistry of ocean island basalts (OIBs), some of which have isotopic and trace-element characteristics plausibly associated with ancient sedimentary components. In particular, the EM1 mantle end-member has been identified, principally on the basis of strontium, neodymium and lead isotopes, and has been proposed to carry a large sediment fraction. Oxygen isotopes should be sensitive indicators of subducted sediment in the sources of OIBs because minerals that interact with water at low temperatures near the Earth's surface (during weathering, for example) become enriched in ^(18)O relative to ^(16)O (ref. 6). We report here the ^(18)O:^(16)O ratios of phenocrysts from basalts from Pitcairn Island (southeast Pacific Ocean), which, together with the nearby Pitcairn seamounts, contain among the most extreme EM1 signatures known. We find the oxygen isotope ratios of the phenocrysts to be indistinguishable from the average for mantle peridotite. These results show that the end-member EM1 signature can be produced in the absence of substantial (>l-2%) recycled sediment in the mantle.

Item Type:Article
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URLURL TypeDescription
Farley, Kenneth A.0000-0002-7846-7546
Stolper, Edward M.0000-0001-8008-8804
Hauri, Eric H.0000-0002-7449-4774
Additional Information:© 1995 Nature Publishing Group. Received 10 April; accepted 8 August 1995. We thank J. Woodhead for sharing unpublished analysis of seamount glasses, W. White for comments on the manuscript, M. Spicuzza and N. Kitchen for assistance in the stable-isotope laboratory, and P. Carpenter for help with electron microprobe analysis. This research was supported in part by DOE and NSF.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
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Department of Energy (DOE)UNSPECIFIED
Issue or Number:6545
Record Number:CaltechAUTHORS:20120827-082431654
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Official Citation:Oxygen isotope evidence against bulk recycled sediment in the mantle sources of Pitcairn Island lavas John M. Eiler, Kenneth A. Farley, John W. Valley, Edward M. Stolper, Eric H. Hauri & Harmon Craig Nature 377, 138 - 141 (14 September 1995); doi:10.1038/377138a0
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33544
Deposited By: Ruth Sustaita
Deposited On:27 Aug 2012 15:59
Last Modified:09 Nov 2021 21:35

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