Disequilibrium of the 238U series in basalt
Earth and Planetary Science Letters
By: B.L.K. Somayajulu, M. Tatsumoto, J.N. Rosholt, and R. J. Knight
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Abstract
Radioisotope analyses of basalt samples from Hawaii, Japan, and Iwo Jima show that: (1)234U and238U 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 with234U.
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 excess206Pb in volcanic rocks.
The isotopic composition of lead and specific activity of210Pb in sublimates from Showa-shinzan, Japan are also reported.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Disequilibrium of the 238U series in basalt |
| Series title | Earth and Planetary Science Letters |
| DOI | 10.1016/0012-821X(66)90032-X |
| Volume | 1 |
| Issue | 6 |
| Year Published | 1966 |
| Language | English |
| Publisher | Elsevier |
| Description | 5 p. |
| First page | 387 |
| Last page | 391 |
| Country | United States, Japan |
| State | Hawaii |
| Other Geospatial | Iwo Jima |