Reliability of Uranium Series Dating in Divje babe IEffect of sedimentation gaps on uranium concentrations in sedimentsand on uranium series dating
Abstract
The contribution deals with four U series (230Th/234U) datesfrom the Divje babe I site in connection with geochemical andother analyses of sediments. We attempt with a combinationof data of all analyses to explain the difference between U seriesand other radiometric ages (14C AMS and ESR), relating tothe same samples or layers.Absorption of U in bones and sediments of Divje babe Itook place in an open system. Its binding did not take placelinearly, nor was there early or late uptake after deposition ofthe bones as models envisage, but we are actually dealing witha combination of all three possibilities. Extended gaps insedimentation greatly inf luenced mobilisation and absorptionof U. They lead to remobilisation of U, which is the suspectedcause of irregularities and inaccuracies in determining age bythe U series method, and indirectly also the ESR method
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