Disequilibrium of the 238U series in basalt

Earth and Planetary Science Letters
By: , and 


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Radioisotope analyses of basalt samples from Hawaii, Japan, and Iwo Jima show that: (1) 234U and 238U are virtually in radioactive equilibrium, (2) 230Th exceeds equilibrium values in all these samples, (3) 210Pb concentrations range from 10-200% of the equilibrium values and average 30% deficient, and (4) 226Ra is probably not in equilibrium with 234U. The source regions of the basalts or magma forming processes are open systems, chemically. The enrichment of some of the uranium-daughter nuclides is insufficient to account for the excess 206Pb in volcanic rocks. The isotopic composition of lead and specific activity of 210Pb in sublimates from Showa-shinzan, Japan are also reported. ?? 1966.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Disequilibrium of the 238U series in basalt
Series title Earth and Planetary Science Letters
Volume 1
Issue 6
Year Published 1966
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Earth and Planetary Science Letters
First page 387
Last page 391
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