Distribution of trace elements between carbonate and non-carbonate phases of limestone

Physics

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Scientific paper

Marine limestones from southern Germany were analysed by the non-destructive neutron activation/Ge(Li) spectrometric method for La, Ce, Sm, Eu, Tb, Yb, Lu, Sr, Ta, U, Sc, Th, Cr, Hf, Cs, Fe and Rb. On the basis of carbonate and non-carbonate portions of the rock, the elements could be divided into (1) those associated with clastic material (Sc, Cr, Hf, etc.), (2) those which were partly associated with authigenic material (REE), and (3) those with pronounced diagenetic history (Sr, U). The calculated effective REE distribution coefficient (Di,eff) between CaCO3 and seawater varied from about 1400 for La to about 460 for Lu suggesting fractionation of the lighter and the heavier REE's in favour of the former.

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