Other
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..72..149m&link_type=abstract
Earth and Planetary Science Letters, Volume 72, Issue 2-3, p. 149-157.
Other
117
Scientific paper
The activity ratio (230Th/238U) is calculated for a simple model of melting, for which the melt fraction in chemical and radioactive equilibrium with the solid residium remains constant as melting proceeds. The activity ratio in the melt is only significantly different from unity if the melting is slow compared with the half-life of 230Th and if the melt fraction present at any time does not exceed a few percent. The observation that (230Th/238U) is about 1.25 for many ocean ridge basalts is therefore most easily explained if the melt fraction in the source region is less than 2% and if the melting occurs in a broad region more than 100 km wide beneath the ridge axis. These results are compatible with other geophysical observations. Measurements of (226Ra/238U) might provide useful constraints on the time required to reach chemical equilibrium between the melt and the matrix.
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