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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Lithium isotopes in global mid-ocean ridge basalts
Geochimica et Cosmochimica Acta, Volume 72, No. 6, Year 2008
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Description
The lithium isotope compositions of 30 well-characterized samples of glassy lavas from the three major mid-ocean ridge segments of the world, spanning a wide range in radiogenic isotope and elemental content and sea floor physical parameters, have been measured. The overall data set shows a significant range in δ7Li (+1.6 to +5.6), with no global correlation between Li isotopes and other geochemical or tectonic parameters. The samples with the greatest lithophile element depletion (NMORB: K2O/TiO2 < 0.09) display an isotopic range consistent with the extant database. Samples with greater trace element enrichment display a greater degree of isotopic variability and trend toward heavier compositions (δ7Li = +2.4 to +5.6), but are not distinct on average from N-MORB. Together with published data, N-MORB is estimated to have mean δ7Li = +3.4 ± 1.4‰ (2σ), consistent with the estimate for an uncontaminated MORB source based on pristine peridotite xenoliths. Locally, where sampling density permits, sources of Li isotope heterogeneity may be evaluated. Sample sets from the East Pacific Rise show correlation of δ7Li with halogen concentration ratios. This is interpreted at 15.5°N latitude to represent incorporation of <5 weight percent recycled subduction-modified mantle in the MORB source. At 9.5°N latitude the data are more consistent with shallow level magma chamber contamination by seawater-derived components (<0.5 wt.%). © 2008 Elsevier Ltd.
Authors & Co-Authors
Tomascak, Paul B.
United States, Oswego
Suny Oswego
Langmuir, Charles H.
United States, Cambridge
Harvard University
Le Roux, Petrus J.
United States, Washington, D.c.
Carnegie Institution of Washington
South Africa, Cape Town
University of Cape Town
Shirey, Steven B.
United States, Washington, D.c.
Carnegie Institution of Washington
Statistics
Citations: 210
Authors: 4
Affiliations: 4
Identifiers
Doi:
10.1016/j.gca.2007.12.021
ISSN:
00167037
Research Areas
Genetics And Genomics