Stable isotope (δ18О, δ2H and dexc) minimum, mean, and maximum values for massive ice, Eastern Chukotka

Stable oxygen and hydrogen compositions in ice were analyzed in the stable isotope laboratory of the Faculty of Geography at Lomonosov Moscow State University using a Finnigan Delta-V Plus mass spectrometer applying equilibration techniques. The values are presented in δ-notation in per mille (‰) relative to the Vienna Standard Mean Ocean Water (VSMOW). International reference materials (V-SMOW-2, GISP, and SLAP) were used for the calibration. The analytical precision is ±0.1‰ for δ18О and ±0.8‰ for δ2H. Deuterium excess (dexc) was calculated as dexc = δ2H - 8δ18O (Dansgaard 1964). Totally, 84 samples of massive ice were analyzed for stable isotope composition, and organic micro-inclusions for 14C AMS analysis were extracted from 5 samples.