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OPTICAL DATING OF A LATE QUATERNARY SEDIMENT SEQUENCE FROM SOKLI, NORTHERN FINLAND

Author:
  • Helena Alexanderson
  • Kari O. Eskola
  • Karin F. Helmens
Publishing year: 2008
Language: English
Pages: 51-59
Publication/Series: Geochronometria
Volume: 32
Document type: Journal article
Publisher: WIND-J WOJEWODA PUBLISHING CO.

Abstract english

Interstadial and non-glacial stadial sediments collected in boreholes from Sokli in northeastern Finland have been dated by optically stimulated luminescence on quartz and feldspar grains. The quartz OSL ages follow stratigraphic order, with one exception, and support the litho-and bio-stratigraphical correlation with the NW European mainland climate-stratigraphy and the marine oxygen-isotope stages. Feldspar IRSL dates generally overestimate the age, probably due to incomplete bleaching. The data show that during the last glacial cycle north-eastern Finland was not glaciated until MIS 5b, around 90 ka. Interstadial conditions occurred around similar to 94 ka (MIS 5c), similar to 74-80 ka (MIS 5a) and 42-54 ka (MIS 3). The OSL ages have large standard errors mainly due to small sample sizes, relatively poor luminescence characteristics and uncertainties in dose-rate determinations.

Keywords

  • Geology
  • OSL
  • interglacial-glacial cycle
  • Fennoscandia
  • Finland
  • Weichselian
  • interstadial

Other

Published
  • ISSN: 1897-1695
Helena Alexandersson
E-mail: helena [dot] alexanderson [at] geol [dot] lu [dot] se

Professor

Quaternary Sciences

+46 46 222 44 83

435

16

Aeolian sand project

Project members
Members of the aeolian sand project: Martin Bernhardson, Sara Florén, Edyta Kalińska-Nartiša and Helena Alexanderson.

Read more about the project here.