VPDBVienna PeeDee Belemnite
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5[per thousand] with a range from -16[per thousand] to -9[per thousand] relative to the VPDB standard (Bender 1968; Smith & Epstein 1970; Deines 1980; Vogel 1980).
Stable isotopic compositions are reported in [delta]-notation relative to VSMOW for hydrogen and oxygen and VPDB for carbon (Coplen 1996).
17]O contribution and are reported in per mil notation relative to the VPDB standard.
2] gas and the VPDB standard were determined with a VG Isogas PRISM Series I mass spectrometer equipped with triple collectors and mico-inlet system.