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

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

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.

Detaljer

Författare
Externa organisationer
  • Norwegian University of Life Sciences
  • University of Helsinki
  • Stockholms universitet
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Geologi

Nyckelord

Originalspråkengelska
Sidor (från-till)51-59
TidskriftGeochronometria
Volym32
StatusPublished - 2008
PublikationskategoriForskning
Peer review utfördJa
Externt publiceradJa