@article{fdi:010062475,
  title = {{P}robing atomic scale transformation of fossil dental enamel using {F}ourier transform infrared and nuclear magnetic resonance spectroscopy : a case study from the {T}ugen {H}ills ({R}ift {G}regory, {K}enya)},
  author = {{Y}i, {H}. {H}. and {B}alan, {E}tienne and {G}ervais, {C}. and {S}egalen, {L}. and {R}oche, {D}. and {P}erson, {A}. and {F}ayon, {F}. and {M}orin, {G}. and {B}abonneau, {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A} series of fossil tooth enamel samples was investigated by {F}ourier transform infrared ({FTIR}) spectroscopy, {C}-13 and {F}-19 magic-angle spinning nuclear magnetic resonance ({MAS} {NMR}) and scanning electron microscopy ({SEM}). {T}ooth remains were collected in {M}io-{P}liocene deposits of the {T}ugen {H}ills in {K}enya. {S}ignificant transformations were observed in fossil enamel as a function of increasing fluorine content (up to 2.8 wt.%). {FTIR} spectroscopy revealed a shift of the nu(1) {PO}4 stretching band to higher frequency. {T}he nu(2) {CO}3 vibrational band showed a decrease in the intensity of the primary {B}-type carbonate signal, which was replaced by a specific band at 864 cm(-1). {T}his last band was ascribed to a specific carbonate environment in which the carbonate group is closely associated to a fluoride ion. {T}he occurrence of this carbonate defect was consistently attested by the observation of two different fluoride signals in the 19{F} {NMR} spectra. {O}ne main signal, at similar to-100 ppm, is related to structural {F} ions in the apatite channel and the other, at -88 ppm, corresponds to the composite defect. {T}hese spectroscopic observations can be understood as resulting from the mixture of two phases: biogenic hydroxylapatite (bioapatite) and secondary fluorapatite. {SEM} observations of the most altered sample confirmed the extensive replacement of the bioapatite by fluorapatite, resulting from the dissolution of the primary bioapatite followed by the precipitation of carbonate-fluorapatite. {T}he nu(2) {CO}3 {IR} bands can be efficiently used to monitor the extent of this type of bioapatite transformation during fossilization.},
  keywords = {{B}ioapatite ; {FTIR} spectroscopy ; {MAS} {NMR} spectroscopy ; {F}ossil enamel ; {C}arbonate defect ; {KENYA}},
  booktitle = {},
  journal = {{A}cta {B}iomaterialia},
  volume = {10},
  numero = {9},
  pages = {3952--3958},
  ISSN = {1742-7061},
  year = {2014},
  DOI = {10.1016/j.actbio.2013.12.049},
  URL = {https://www.documentation.ird.fr/hor/fdi:010062475},
}