Sedimentary apatites subjected to high temperatures under catagenesis and hydrothermal effect are shown to have a reduced Sr content. This is the case in both ancient (Cambrian and Precambrian) and relatively young (Late Jurassic and Neogene) phosphorites. It is not ruled out that possible variations in Sr content in the waters of sea sedimentation basins affect the Sr content in phosphorites, but this hypothesis is as yet unjustified by factual data.
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