Whole rock and mineral separate nitrogen concentration and isotopic data for meta-ultramafic rocks

Nitrogen concentrations and 𝛿15N compositions for nine whole rock and eighteen mineral separate samples. Samples are serpentinites, talc schists and a chlorite schist from Syros, Greece and New Caledonia, representing subducted and exhumed meta-ultramafic lithologies. These data were collected to characterize the bulk rock and phyllosilicate mineral compositions.