Open AccessCosmogenic 10 Be exposure age dating across Early to Late Weichselian ice‐marginal zones in northwestern Russia
Author(s) -
LINGE HENRIETTE,
LARSEN EILIV,
KJæR KURT H.,
DEMIDOV IGOR N.,
BROOK EDWARD J.,
RAISBECK GRANT M.,
YIOU FRANCOISE
Publication year - 2006
Publication title -
boreas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.95
H-Index - 74
eISSN - 1502-3885
pISSN - 0300-9483
DOI - 10.1080/03009480600781909
Subject(s) - geology , glacial period , bedrock , outcrop , ridge , deglaciation , peninsula , surface exposure dating , paleontology , geomorphology , moraine , geochemistry , archaeology , history
Rock samples from the Kanin Peninsula and the Timan Ridge were analysed for in situ cosmogenic 10 Be for exposure age dating purposes. Crystalline rocks were sampled at four sites on the Kanin Peninsula, either from bedrock outcrops or from glacial erratics, giving overall similar 10 Be ages. Outcropping sandstone and crystalline erratics were available from three sites at the Timan Ridge. The highly weathered sandstone gives substantially younger 10 Be ages than the adjacent erratics. The exposure ages from the Kanin Peninsula suggest that the last deglaciation of this area took place between 55 and 37 10 Be kyr ago, in agreement with a preceding Kara Sea glaciation (55–45 kyr BP). The northwest coast of the peninsula was probably just outside the maximum limit of the last Scandinavian glaciation (20–17 kyr BP). Glacial erratic exposure ages from the Timan Ridge suggest that the 55–45 kyr BP Kara Sea glaciation reached the northern part of the ridge. The exposure dates do not show conclusive evidence regarding the existence of a Timan Ridge ice cap.