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Science 27 January 1995:
Vol. 267. no. 5197, pp. 508 - 512
DOI: 10.1126/science.267.5197.508
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Articles

Mechanisms of Magma Generation Beneath Hawaii and Mid-Ocean Ridges: Uranium/Thorium and Samarium/Neodymium Isotopic Evidence

Kenneth W. W. Sims 1, Donald J. DePaolo 2, Michael T. Murrell 3, W. Scott Baldridge 3, Steven J. Goldstein 3, and David A. Clague 4

1 Center for Isotope Geochemistry, Department of Geology and Geophysics, University of California, Berkeley, CA 94720, USA, and Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
2 Center for Isotope Geochemistry, Department of Geology and Geophysics, University of California, Lawrence Berkeley Laboratory, Berkeley, CA 94720, USA.
3 Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
4 Hawaiian Volcano Observatory, Hawaii National Park, HI 96718, USA.

Measurements of uranium/thorium and samarium/neodymium isotopes and concentrations in a suite of Hawaiian basalts show that uranium/thorium fractionation varies systematically with samarium/neodymium fractionation and major-element composition; these correlations can be understood in terms of simple batch melting models with a garnet-bearing peridotite magma source and melt fractions of 0.25 to 6.5 percent. Midocean ridge basalts shows a systematic but much different relation between uranium/thorium fractionation and samarium/neodymium fractionation, which, although broadly consistent with melting of a garnet-bearing peridotite source, requires a more complex melting model.

Submitted on August 17, 1994
Accepted on November 17, 1994


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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