The elements uranium and thorium gradually decay into lead different isotopes of lead arising from the various isotopes of uranium and thorium some isotopes of lead are however not produced by any radioactive decay process.
38 uranium thorium dating while radiocarbon dating is limited to about lt50 000 y and the 40k40ar dating method is limited to volcanic material and also used to be limited to samples of more than 100 000 y of age.
uranium lead dating problems advice good dating headlines examples at any rate there will be some effects of this nature that will produce some kinds of changes in concentration of uranium and thorium relative to lead from the top to the bottom of a magma chamber.
Ioniumthorium dating ioniumthorium dating method of establishing the time of origin of marine sediments according to the amount of ionium and thorium they contain because uranium compounds are soluble in seawater while thorium compounds are quite insoluble the thorium isotopes produced by the decay of uranium in.
Span classnews_dtmay 31 1990spannbsp018332uraniumthorium dating dr alan zindler a professor of geology at columbia university who is a member of the lamontdoherty research group said age estimates using the carbon dating and uraniumthorium dating differed only slightly for the period from 9000 years ago to the present.