Mechanisms of Magma Generation Beneath Hawaii and Mid-Ocean Ridges: Uranium/Thorium and Samarium/Neodymium Isotopic Evidence
1995; American Association for the Advancement of Science; Volume: 267; Issue: 5197 Linguagem: Inglês
10.1126/science.267.5197.508
ISSN1095-9203
AutoresK. W. W. Sims, Donald J. DePaolo, Michael T. Murrell, W. Scott Baldridge, Steven J. Goldstein, David A. Clague,
Tópico(s)High-pressure geophysics and materials
ResumoMeasurements 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.
Referência(s)