<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">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 biostratigraphical 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 ~94 ka (MIS 5c), ~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.</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 biostratigraphical 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 ~94 ka (MIS 5c), ~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.

Optical Dating of a Late Quaternary Sediment Sequence from Sokli, Northern Finland

Department of Plant and Environmental Sciences, Norwegian University of Life Sciences, P.O. Box 5003, NO-1432 Ås, Norway

Dating Laboratory, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland

Department of Physical Geography and Quaternary Geology, Stockholm University, SE-106 91 Stockholm, Sweden

Geochronometria

Interstadial and non-glacial stadial sediments collected in boreholes from Sokli in northeastern Finland have been dated by optically stimulated luminescence...

Optical Dating of a Late Quaternary Sediment Sequence from Sokli, Northern Finland

Pubblicato online: 30 gen 2009

Pagine: 51 - 59

DOI: https://doi.org/10.2478/v10003-008-0022-9

Parole chiave
OSL, interglacial-glacial cycle, Fennoscandia, Finland, Weichselian, interstadial

This content is open access.

Optical Dating of a Late Quaternary Sediment Sequence from Sokli, Northern Finland

Pubblicato online: 30 gen 2009

Pagine: 51 - 59

DOI: https://doi.org/10.2478/v10003-008-0022-9

Parole chiaveOSL, interglacial-glacial cycle, Fennoscandia, Finland, Weichselian, interstadial

This content is open access.

Parole chiave
OSL, interglacial-glacial cycle, Fennoscandia, Finland, Weichselian, interstadial