Oxygen isotope evidence for recycled crust in the source of EM-type ocean island basalts

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doi: 10.1038/362809a0
Authors:Woodhead, John D.; Greenwood, Peter; Harmon, Russell S.; Stoffers, Peter
Author Affiliations:Primary:
Australian National University, Research School of Earth Sciences, Canberra, Australia
NERC Isotope Geoscience Laboratory, United Kingdom
Universität Kiel, Federal Republic of Germany
Volume Title:Nature (London)
Source:Nature (London), 362(6423), p.809-813. Publisher: Macmillan Journals, London, United Kingdom. ISSN: 0028-0836
Publication Date:1993
Note:In English. 29 refs.; illus. incl. 1 table
Summary:SiO2, MgO contents and Sr, Nd, Pb and O isotopic compositions are presented of EM (enriched mantle) fresh, recently erupted OIB glasses from the Pitcairn and Society seamount hotspots, Polynesia. The O isotope compositions appear to require subducted crustal components in the source of the lavas. Most of these glasses have relatively high delta18O indicating <= 9% of recycled crustal oxygen in their mantle source. Significant delta18O variations in both sample suites extend to beyond the MORB average of +5.7 per mille, and the constraints of O isotopes (alteration and high-level magmatic processes) are discussed. [R.K.H.]
Subjects:Alkaline earth metals; Basalts; Crust; Enrichment; Geochemical cycle; Glasses; Igneous rocks; Isotopes; Lava; Lead; Mantle; Metals; Nd-144/Nd-143; Neodymium; O-18/O-16; Ocean-island basalts; Oceanic crust; Oxygen; Pb-206/Pb-204; Pb-207/Pb-204; Pb-208/Pb-204; Plate tectonics; Radioactive isotopes; Rare earths; Seamounts; Sr-87/Sr-86; Stable isotopes; Strontium; Subduction; Volcanic glass; Volcanic rocks; French Polynesia; Oceania; Pacific Ocean; Pitcairn Island; Polynesia; Society Islands; EM-type basalts; South Polynesian Pacific
Coordinates:S280000 S150000 W1270000 W1550000
Abstract Numbers:93M/4486
Record ID:1993012362
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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