Reporting Standards

Isotope data are reported relative to the following internationally recognized standard materials

δ 18O and δD:

All δ 18O (except carbonates) and δ D values are reported relative to Vienna SMOW (Standard Mean Ocean Water). δ 18O of carbonates are reported relative to PDB (Cretaceous belemnite from the PeeDee formation).

The conversion of PDB δ 18O to SMOW δ 18O is:

δ 18O SMOW = 1.03086* δ 18O PDB + 30.86

δ 18C

All δ 13 C values are reported relative to PDB (Cretaceous belemnite from the PeeDee formation).

δ 15N:

δ 15N: values are reported relative to atmospheric nitrogen.

δ 34S:

δ 34S: values are reported relative to troilite of the Canyon Diablo iron meteorite.

δ 37Cl:

δ 37Cl ± 0.5‰ are reported relative to Standard Mean Ocean Chloride (SMOC).

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