PeeDee belemnite


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PeeDee belemnite

[‚pē‚dē bə′lem‚nīt]
(geochemistry)
Limestone from the PeeDee Formation in South Carolina (derived from the Cretaceous marine fossil Belemnitella americana), the carbon and oxygen isotope ratios of which are used as an international reference standard. Abbreviated PDB.
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12]C relative to the PeeDee belemnite standard--was completed on each sample with an isotope ratioing mass spectrometer as described by Read et al.
2]) were introduced into a Finnigan Delta C mass spectrometer, and the isotopic composition was quantified relative to a standard reference material: carbon in the PeeDee Belemnite and molecular nitrogen gas in the air.
where X = sample; and S = the marine carbonate standard Vienna Peedee belemnite, VPDB (Gao et al.
Data were expressed as the ratio of (13)C/(12)C relative to the PeeDee belemnite standard and converted to [Delta] as described by Farquhar et al.
Stable isotope determinations were expressed as the permille difference from the international PeeDee Belemnite standard, where [[Delta].
The isotopic composition of a carbon compound is expressed as [Delta]13C, the proportional deviation of the 13C/12C ratio from the internationally accepted Peedee belemnite (PDB) carbonate standard (Craig 1957):
18]O value relative to the international reference standard of Vienna PeeDee Belemnite (VPDB) in [per thousand], where