Abstract
Chemical and radiometric techniques have been used to study the distribution of radioactivity in the Mansfield Marine Band. Thorium is thought to be associated with the clay minerals and possibly to have been fixed during the weathering of the source rocks. Some uranium is concentrated in phosphatic material, but most is associated with the clay minerals, and there is an absence of uranium rich minerals. It is thought that factors controlling the sorbtion of uranium are the presence of reducing conditions, a slow rate of deposition and the salinity.
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