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
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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