AMS radiocarbon age and stable oxygen and hydrogen isotopes ratio of Holocene ice wedges of the Pur-Taz interfluve

Abstract Six AMS 14 C dates from an ice wedge tested in the Holocene wetland on the Pur-Taz interfluve in northwest Siberia are shown here. In the Pur-Taz peatland, peat accumulation started between 11 and 10 cal ka BP, and in the detail studied site, it started after 9.5 cal ka BP. Within the studied peatland, intense ice wedge growth took place between 5.3 and 3.4 cal ka BP. The growth of ice wedges near their southern limit occurred at least 3–4 ka after the formation of the host peat, according to the results of AMS 14 C direct dating of ice wedges. Mean January air temperatures ranged from –30 to –27°C during the ice wedge growth phase, which is 2–4°C colder than the current temperature.