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- W1511315423 abstract "The crystalline fraction of enamel, dentin and metapodial bone of modern and fossil mammals were studied by X-ray diffraction analysis. The powdered samples were collected from several equids, giraffids, rhinocerotids and proboscideans of Spanish Neogene deposits. Changes in the crystallinity index (CI) of apatite are particularly useful to estimate later diagenetic changes in the fossil material. The enamel displays larger CI than dentine and metapodial bone since they have a more dense structure; furthermore there is not a clear relationship between the CI enlargement and the geological age of samples. In addition, the fluorine content increases during the fossilization process and accordingly the parameter CI increases in fossil samples. The carbonate enrichment is not linked to the age of the deposits; however this carbonate increase in enamel, dentine and metapodial bone reduces the CI parameter. The host sediments play an essential role in the crystallinity changes observed in fossil bones; e.g., in the silica sands case, samples display a high CI while in the claystone and chalks case, they display a lower crystallinity index." @default.
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- W1511315423 date "2008-02-25" @default.
- W1511315423 modified "2023-09-28" @default.
- W1511315423 title "Relationship of the cristallinity index (CI) with the age and content of F and CO<sub>3</sub> ions in vertebrate fossil samples" @default.
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- W1511315423 doi "https://doi.org/10.3989/egeol.08641364" @default.
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