Phosphate δ18O determination of modern rodent teeth by direct laser fluorination: an appraisal of methodology and potential application to palaeoclimate reconstruction

Lindars, E. S., Grimes, S. T., Mattey, D. P., Collinson, M. E., Hooker, J. J. and Jones, Timothy Peter ORCID: https://orcid.org/0000-0002-4466-1260 2001. Phosphate δ18O determination of modern rodent teeth by direct laser fluorination: an appraisal of methodology and potential application to palaeoclimate reconstruction. Geochimica et Cosmochimica Acta 65 (15) , pp. 2535-2548. 10.1016/S0016-7037(01)00606-8

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Abstract

A direct laser-fluorination (DLF) method is presented for phosphate d18O analysis (mass 1 — 2mg). The automated system heats samples in the presence of excess BrF5 using a 25 W CO2 laser, at 10.66mm. d18O ratios of the liberated O2 were measured using a dual inlet Optima mass spectrometer. As DLF measures whole apatite oxygen, non-phosphate bound oxygen must be removed by pre-treatment. Two methods were investigated: 1) heating to 1000°C; and 2) heating to 400°C followed by laser fusing. Method 2 is recommended as samples heated to 1000°C showed evidence of oxygen exchange with atmospheric water. To validate the DLF method, and show the potential of rodent teeth in palaeoclimate reconstruction, modern rodent teeth d18O results from 2 species are presented (d18Op). Large inter- and intra-jaw heterogeneity indicates that single teeth cannot be used for palaeothermometry. However, the overall standard deviations were low (Glis glis d18Op 5 110.4 6 0.7‰ n 5 38 and Apodemus sylvaticus d18Op 5 114.4 6 1.3‰ n 5 24). Using equations, derived from lab rodents, an ingested water value of 25.6 6 2.2‰ was calculated for Apodemus sylvaticus, only 21.3‰ lower than measured local water (24.3‰). This suggests that the phosphate d18O of rodent teeth can be used as a proxy for palaeoclimate reconstruction.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Subjects:	G Geography. Anthropology. Recreation > GE Environmental Sciences Q Science > Q Science (General)
Publisher:	Elsevier
ISSN:	0016-7037
Last Modified:	19 Oct 2022 09:41
URI:	https://orca.cardiff.ac.uk/id/eprint/21841

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