Abstract
A series of ultrabasic rocks and carbonatites were analyzed by neutron activation for iodine and uranium. The uranium data are compared with earlier data on the uranium content of possible mantle material. The high uranium content of the carbonatites, 0.80–8.0 ppm, indicates that these may make a sizeable contribution to the average terrestrial heat flow. The iodine and uranium data are compared with the iodine and uranium contents of stone meteorites and with the xenon decay products of extinct 129I and 244Pu in the meteorites. The concentrations of these decay products in the atmosphere are used to show that the earth began to retain these gaseous products as early as the eurite achondrites.
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