Intra-tooth study of modern rhinoceros enamel δ18O: Is the difference between phosphate and carbonate δ18O a sound diagenetic test?

Martin, Céline; Bentaleb, I.; Kaandorp, R.J.G.; Iacumin, Paola; Chatri, K.

doi:10.1016/j.palaeo.2008.03.039

Cited by 74 publications

(53 citation statements)

References 49 publications

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“…18 O C-P $ 9‰ (Martin et al, 2008), is consistent with the 8.5‰ fractionation factor calculated here at 37°C between carbonate and phosphate in carbonated fluorapatite. The carbonate-phosphate relationship displays a natural variability (e.g.…”

Section: Hydroxyapatite Oxygen Internal Fractionationsupporting

confidence: 89%

Site-specific equilibrium isotopic fractionation of oxygen, carbon and calcium in apatite

Aufort

Ségalen

Gervais

et al. 2017

Geochimica et Cosmochimica Acta

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The stable isotope composition of biogenic apatite is an important geochemical marker that can record environmental parameters and is widely used to infer past climates, biomineralization processes, dietary preferences and habitat of vertebrates. In this study, theoretical equilibrium isotopic fractionation of oxygen, carbon and calcium in hydroxyapatite and carbonate-bearing hydroxyapatite is investigated using first-principles methods based on density-functional theory and compared to the theoretical isotopic fractionation properties of calcite, CO 2 and H 2 O. Considering the variability of apatite crystal-chemistry, special attention is given to specific contributions of crystal sites to isotopic fractionation. Significant internal fractionation is calculated for oxygen and carbon isotopes in CO 3 between the different structural sites occupied by carbonate groups in apatite (typically 7‰ for both 18 O/ 16 O and 13 C/ 12 C fractionation at 37°C). Compared with calcite-water oxygen isotope fractionation, occurrence of A-type substitution in apatite structure, in addition to the main B-type substitution, could explain the larger temperature dependence of oxygen isotope fractionation measured at low temperature between carbonate in apatite and water. Theoretical internal fractionation of oxygen isotopes between carbonate and phosphate in B-type carbonated apatite ($8‰ at 37°C) is consistent with experimental values obtained from modern and well-preserved fossil bio-apatites. Concerning calcium, theoretical results suggest a small fractionation between apatite and calcite (À0.17‰ at 37°C). Internal fractionation reaching 0.8‰ at 37°C occurs between the two Ca sites in hydroxyapatite. Furthermore, the Ca isotopic fractionation properties of apatite are affected by the occurrence of carbonate groups, which could contribute to the variability observed on natural samples. Owing to the complexity of apatite crystal-chemistry and in light of the theoretical results, measurements of site-specific isotopic fractionation properties could improve our understanding and the interpretation of isotopic records in apatites.

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Section: Hydroxyapatite Oxygen Internal Fractionationsupporting

confidence: 89%

Site-specific equilibrium isotopic fractionation of oxygen, carbon and calcium in apatite

Aufort

Ségalen

Gervais

et al. 2017

Geochimica et Cosmochimica Acta

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“…It is important to identify these samples as such interaction may cause large changes to the primary isotope life signal. [31] Potential diagenetic alteration in tooth and bone are often identified by crystallinity index, [23,51,52] %C yields [53] [1,5,25] We know from studies of strontium isotopes that less resistant material such as bone and dentine frequently react in the burial environment and equilibration and deposition will affect the 87 Sr/ 86 Sr of these materials. [43,50] To test the reliability of the structural carbonate component we undertook analysis of six teeth, where it was clear from existing strontium isotope analysis that the integrity of the enamel had been compromised.…”

Section: An Assessment Of Diagenetic Alterationmentioning

confidence: 99%

“…O C values (slope, intercept and Δ C-P ) is species-specific, where Δ C-P is the difference between d [25] demonstrated that there are statistical differences between the intercepts of the d…”

mentioning

confidence: 99%

The oxygen isotope relationship between the phosphate and structural carbonate fractions of human bioapatite

Chenery

Pashley

Lamb

et al. 2012

Rapid Comm Mass Spectrometry

236

229

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“…Iacumin et al (1996) found α=1.0090±0.0007 (n=31), Bryant et al (1996) found α=1.0086±0.0007 (n=42), and Martin et al (2008) found α=1.0082±0.0007 (22 measurements on two teeth); other, smaller, studies are summarised in Martin et al (2008). Since the studies by Iacumin et al (1996) and Bryant et al (1996) have the largest number of data points, they are probably the most reliable.…”

Section: Re-interpreting the Datamentioning

confidence: 96%

“…Consequently, when δ 18 O bw is expressed as a linear function of δ 18 O dw , the gradient of the relationship is less than one (Luz et al, 1984). Enamel carbonate and phosphate are in isotopic equilibrium with body water at 37 ºC at the time of formation but, as Bell et al (2009: 168) rightly point out, the chemical routes differ, so that the values are offset (Iacumin et al, 1996;Bryant et al, 1996;Martin et al, 2008). …”

Section: Introductionmentioning

confidence: 99%

‘True British sailors’: a comment on the origin of the men of the Mary Rose

Millard

Schroeder

2010

Journal of Archaeological Science

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Intra-tooth study of modern rhinoceros enamel δ18O: Is the difference between phosphate and carbonate δ18O a sound diagenetic test?

Cited by 74 publications

References 49 publications

Site-specific equilibrium isotopic fractionation of oxygen, carbon and calcium in apatite

Site-specific equilibrium isotopic fractionation of oxygen, carbon and calcium in apatite

The oxygen isotope relationship between the phosphate and structural carbonate fractions of human bioapatite

‘True British sailors’: a comment on the origin of the men of the Mary Rose

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