Melting rates beneath Hawaii: Evidence from uranium series isotopes in recent lavas

Details Melting rates beneath Hawaii: Evidence from uranium series isotopes in recent lavas Melting rates beneath Hawaii: Evidence from uranium series isotopes in recent lavas

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.120..169c&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 120, no. 3-4, p. 169-175

Computer Science

25

Abundance, Basalt, Lava, Melting, Uranium Isotopes, Garnets, Hawaii, Mass Spectroscopy, Plumes, Porosity

Scientific paper

U-238, Th-232, Th-230 and Ra-226 abundances have been measured in six samples of recent Hawaiian basalt by high precision mass spectrometry, in an attempt to compare the melting process in plumes and at spreading ridges. The data reveal a very small range in (Th-230/U-238) activity ratio up to a maximum value of 1.02 +/- 0.01, and (Ra-226/Th-230) activity ratios which lie between 1.10 +/- 0.015 and 1.19 +/- 0.02. U-Th and Ra-Th abundances are linearly correlated demonstrating that the disequilibria predate crystallization and differentiation. Using recently published estimates for the bulk partition coefficients of U and Th, the results are consistent with melting rates greater than 10(exp -3) kg/cu m/a at porosities less than 10(exp -3) for dynamic fractional melting in the garnet stability field.

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