Reports

Primary Oxidation Variation and Distribution of Uranium and Thorium in a Lava Flow

Science  03 Feb 1967:
Vol. 155, Issue 3762, pp. 579-581
DOI: 10.1126/science.155.3762.579

Abstract

An Icelandic basalt lava flow has a systematic oxidation variation, formed during the initial cooling, with a resultant maximum oxidation just below the center of the lava. The ratio of thorium to uranium shows a clear dependence on this primary oxidation variation. Between-lava comparisons of thorium and uranium may be critically dependent on the position of the samples in each lava.

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