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

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doi: 10.1038/377138a0
Authors:Eiler, John M.; Farley, Kenneth A.; Valley, John W.; Stolper, Edward M.; Hauri, Erik H.; Craig, Harmon
Author Affiliations:Primary:
California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States
Other:
University of Wisconsin, United States
Carnegie Institute of Washington, United States
Scripps Institution of Oceanography, United States
Volume Title:Nature (London)
Source:Nature (London), 377(6545), p.138-141. Publisher: Macmillan Journals, London, United Kingdom. ISSN: 0028-0836
Publication Date:1995
Note:In English. 29 refs.; illus., incl. 1 table
Summary:Major oxide, O and Pb isotopic analyses are presented of garnet, olivine and plagioclase phenocrysts and whole-rock bulk samples of lavas. The Sr-Nd-Pb isotopic composition of the samples span a range including the most extreme mantle EM1 compositions recorded from Pitcairn Island and seamounts. O isotopes should be sensitive indicators of subducted sediment in the sources of OIB since minerals interacting with H2 at low T during, e.g. weathering, become enriched in 18O relative to 16O. The O isotope systematics of the phenocrysts are indistinguishable from the average for mantle peridotite, and the results show that the mantle EM1 end-member signature can be produced in the absence of >><[dollar]I> 1-2% recycled sediment in the mantle. [R.K.H.]
Subjects:Basalts; Feldspar group; Framework silicates; Geochemistry; Histograms; Igneous rocks; Isotopes; Lava; Lead; Mantle; Metals; Nesosilicates; O-18/O-16; Ocean-island basalts; Olivine; Olivine group; Orthosilicates; Oxygen; Pb-206/Pb-204; Pb-207/Pb-204; Pb-208/Pb-204; Phenocrysts; Plagioclase; Radioactive isotopes; Silicates; Stable isotopes; Statistical analysis; Volcanic rocks; Whole rock; Oceania; Pitcairn Island; Polynesia
Coordinates:S250000 S250000 W1300500 W1300500
Abstract Numbers:96M/1904
Record ID:1996002304
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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