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NEUTRON ACTIVATION STUDY OF REE ABUNDANCES IN BIOGENIC APATITE ACROSS THE CAMBRIAN//ORDOVICIAN BOUNDARY
<正> The biogenic apatites, like inarticulata and conodont, can be used as indicators in the study of sedimentary paleoenvironment, since they are highly enriched in REE and bring the elemental geochemical signature of primitive marine sedimentary environment. However, analytical methods with high sensitivity are indispensable to determine the REE abundances in such small fossil samples, usually several to tens of micrograms in weight. Recently, CHEN Jun-yuan et al. analyzed the REE
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Chinese Science Bulletin
1989年10期

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