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).
15]N were measured relative to the VPDB and AIR standards respectively (Hoefs 1996) using an automated Carlo Erba carbon and nitrogen elemental analyser coupled with a continuous flow isotope ratio monitoring mass spectrometer (PDZ Europa Geo 20/20).
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.
13]C (%) AAR-# (1 & 2 sigma ranges) VPDB AAR-10814 68.