14C Dating of Peat and delta-18O-delta-D in Ground Ice from Northwest Siberia
Issue Date
2001-01-01Keywords
tundraD H
Tyumen Russian Federation
Yamal
Yamal Nenets Russian Federation
frozen ground
northwestern Siberia
thawing
ground ice
ice
deuterium
O 18 O 16
hydrogen
oxygen
isotope ratios
Holocene
Russian Federation
Siberia
peat
Commonwealth of Independent States
sediments
Asia
Cenozoic
Quaternary
C 14
carbon
dates
isotopes
radioactive isotopes
stable isotopes
absolute age
Metadata
Show full item recordCitation
Vasil'chuk, Y. K., Jungner, H., & Vasil'chuk, A. C. (2001). 14C dating of peat and delta-18O-delta-D in ground ice from Northwest Siberia. Radiocarbon, 43(2B), 527-540.Journal
RadiocarbonDescription
From the 17th International Radiocarbon Conference held in Jerusalem, Israel, June 18-23, 2000.Additional Links
http://radiocarbon.webhost.uits.arizona.edu/Abstract
We present new radiocarbon dates from a number of Holocene peat deposits along a north-south transect across the Yamal Peninsula. The samples were collected from frozen peat deposits with large ice wedges in: the northern tundra near Seyaha Settlement, in the Central Yamal Peninsula, the southern tundra in Shchuch'ya River valley at the Edem'yaha mouth, the southern part of the Yamal Peninsula, and the southern forest tundra near Labytnangi Town. 14C dates of wood remains from the tundra in the Yamal Peninsula could be used to reconstruct a northern limit of forest during the Holocene Optimum. The wood layers at the bottom of the peat give evidence for immigration of trees further north beyond the present boundary. The first forest appearance in the Seyaha River valley area is dated about 9 ka BP according to the oldest peat date in the Seyaha cross section. This suggests that summer temperatures were higher than at present. Very fast accumulation of peat (around 5 m/ka: about 9-8 ka BP at Seyaha and about 7-6 ka BP at Shchuch'ya) also supports this observation. In contrast, oxygen isotope composition of Holocene syngenetic ice wedges from the area (delta-18O = -19.1 to -20.3 per mil in the Seyaha cross-section and -17.3 to -20.3 per mil in the Shchuch'ya River) show that winter temperatures were significantly lower than presently, i.e. The climate during the Holocene Optimum was slightly more continental. The frozen peat near Labytnangi has thawed during the last 20 years, indicating global warming.Type
Proceedingstext
Language
enISSN
0033-8222ae974a485f413a2113503eed53cd6c53
10.1017/S0033822200041187