title: Primary oxidation variation and distribution of uranium and thorium in a lava flow.
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.
authors.forename: N D
authors.initials: ND
authors.lastname: Watkins
authors.forename: C W
authors.initials: CW
authors.lastname: Holmes
authors.forename: S E
authors.initials: SE
authors.lastname: Haggerty