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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 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 Ocean Sciences
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > Q Science (General)
Publisher: Elsevier
ISSN: 0016-7037
Last Modified: 04 Jun 2017 03:28
URI: http://orca.cf.ac.uk/id/eprint/21841

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