期刊
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
卷 310, 期 1-2, 页码 62-70出版社
ELSEVIER
DOI: 10.1016/j.palaeo.2011.06.016
关键词
Apatite; Diagenesis; Oxygen isotopes; Raman spectroscopy
资金
- Division of Sciences, University of Otago
- Geology Department, University of Otago
- Chemistry Department, University of Otago
Fossil bioapatite may yield biogeochemical signals of paleoenvironments captured by living organisms. Bioapatite may be diagenetically altered, however, with ions added or removed post-mortem; such change is typically assessed using destructive and demanding techniques. Here, Raman spectroscopy is used as a rapid and non-destructive way to identify significant diagenetic alteration of fossil bioapatite. We found spectral parameters of phosphate symmetric stretching (v(1)-PO43-) to be very sensitive to variations in apatite chemistry, particularly with respect to common diagenetic components (CO32-, F-, Sr2+). The Raman spectral parameters were subsequently applied to a set of modem (biogenic) and geologic (magmatic) apatite samples as potential endmembers for diagenetic alteration. Raman spectra were also collected from enamel and dentin (respectively resistant vs. alteration-prone) of fossil teeth. Phosphate-oxygen isotopic values from the same enamel-dentin samples were used as an index of alteration and provided definition of Raman spectral parameters as relates to diagenetic alteration. Diagenetically altered samples were characterised by spectra with v(1)-PO43- widths (at half maximum height) less than 13.0 cm(-1), and v(1)-PO43- band positions greater than 964.7 cm(-1). Raman spectroscopy is shown to have potential as a tool for pre-screening fossil apatite samples before further analyses. (C) 2011 Elsevier B.V. All rights reserved.
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