The late Middle and Late Pleistocene environmental and glaciation history of Northern Ostrobothnia and Finnish Lapland

Abstract The Scandinavian Ice Sheet (SIS) covered Fennoscandia numerous times during the Pleistocene, but the exact number, extent of ice and precise time and duration of glacial and non-glacial phases have not been fully established for the eastern flank of the SIS. At several sites, only incomplet...

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Bibliographic Details
Main Author: Eskola, T. (Tiina)
Other Authors: Lunkka, J. (Juha Pekka)
Format: Doctoral or Postdoctoral Thesis
Language:English
Published: Oulun yliopisto 2021
Subjects:
Eem
OSL
Online Access:http://urn.fi/urn:isbn:9789526231792
id ftunivoulu:oai:oulu.fi:isbn978-952-62-3179-2
record_format openpolar
spelling ftunivoulu:oai:oulu.fi:isbn978-952-62-3179-2 2023-07-30T04:03:27+02:00 The late Middle and Late Pleistocene environmental and glaciation history of Northern Ostrobothnia and Finnish Lapland Eskola, T. (Tiina) Lunkka, J. (Juha Pekka) 2021-12-13 application/pdf http://urn.fi/urn:isbn:9789526231792 eng eng Oulun yliopisto info:eu-repo/semantics/altIdentifier/pissn/0358-2477 info:eu-repo/semantics/altIdentifier/eissn/2489-7957 info:eu-repo/semantics/openAccess © University of Oulu, 2021 Eemian Scandinavian Ice Sheet Weichselian biostratigraphy glaciation heavy liquid lithostratigraphy paleoenvironment pollen Eem Skandinavian mannerjäätikkö Veiksel biostratigrafia jäätiköityminen litostratigrafia paleoympäristö raskasneste siitepöly OSL info:eu-repo/semantics/doctoralThesis info:eu-repo/semantics/publishedVersion 2021 ftunivoulu 2023-07-08T20:00:12Z Abstract The Scandinavian Ice Sheet (SIS) covered Fennoscandia numerous times during the Pleistocene, but the exact number, extent of ice and precise time and duration of glacial and non-glacial phases have not been fully established for the eastern flank of the SIS. At several sites, only incomplete sedimentary records have been preserved owing to different rates of erosion and glaciotectonic deformation during several glacial advances and the intervening non-glacial phases. The most complete sediment successions have been found in northern and west-central Finland, in an area that has escaped erosion due to the vicinity of the ice-divide zone and frozen bed conditions. The main objective of this thesis was to examine the paleoenvironment and glaciation history of the Weichselian (MIS 5–2) and the late Saalian (MIS 6) stages in northern and west-central Finland. This thesis specifically concentrates on pollen stratigraphy and its use in correlation although other stratigraphical and geochronological tools have also been applied. Sediment sequences from three different sites located in northern and central Finnish Lapland and Northern Ostrobothnia, central western part of Finland, were studied using stratigraphical and dating methods. Furthermore, a safer heavy liquid pollen preparation method for minerogenic sediments was introduced and validated. Based on the results, it is suggested that the modified LST Fastfloat method gives comparable results compared to the conventional hydrofluoric acid (HF) method. The thesis provides new geochronologically and biostratigraphically constrained data to establish the more complete stratigraphy for northern and central Finland and beyond. Results indicate that the ice sheet advanced further south than previously thought during the Early Weichselian Herning stadial (MIS 5d). Results also strengthen the view that ice-free conditions prevailed during the Middle Weichselian (MIS 3) stage. Moreover, results from the Kaarreoja site from northern Finnish Lapland indicate that the ... Doctoral or Postdoctoral Thesis Fennoscandia Ice Sheet Lapland Jultika - University of Oulu repository
institution Open Polar
collection Jultika - University of Oulu repository
op_collection_id ftunivoulu
language English
topic Eemian
Scandinavian Ice Sheet
Weichselian
biostratigraphy
glaciation
heavy liquid
lithostratigraphy
paleoenvironment
pollen
Eem
Skandinavian mannerjäätikkö
Veiksel
biostratigrafia
jäätiköityminen
litostratigrafia
paleoympäristö
raskasneste
siitepöly
OSL
spellingShingle Eemian
Scandinavian Ice Sheet
Weichselian
biostratigraphy
glaciation
heavy liquid
lithostratigraphy
paleoenvironment
pollen
Eem
Skandinavian mannerjäätikkö
Veiksel
biostratigrafia
jäätiköityminen
litostratigrafia
paleoympäristö
raskasneste
siitepöly
OSL
Eskola, T. (Tiina)
The late Middle and Late Pleistocene environmental and glaciation history of Northern Ostrobothnia and Finnish Lapland
topic_facet Eemian
Scandinavian Ice Sheet
Weichselian
biostratigraphy
glaciation
heavy liquid
lithostratigraphy
paleoenvironment
pollen
Eem
Skandinavian mannerjäätikkö
Veiksel
biostratigrafia
jäätiköityminen
litostratigrafia
paleoympäristö
raskasneste
siitepöly
OSL
description Abstract The Scandinavian Ice Sheet (SIS) covered Fennoscandia numerous times during the Pleistocene, but the exact number, extent of ice and precise time and duration of glacial and non-glacial phases have not been fully established for the eastern flank of the SIS. At several sites, only incomplete sedimentary records have been preserved owing to different rates of erosion and glaciotectonic deformation during several glacial advances and the intervening non-glacial phases. The most complete sediment successions have been found in northern and west-central Finland, in an area that has escaped erosion due to the vicinity of the ice-divide zone and frozen bed conditions. The main objective of this thesis was to examine the paleoenvironment and glaciation history of the Weichselian (MIS 5–2) and the late Saalian (MIS 6) stages in northern and west-central Finland. This thesis specifically concentrates on pollen stratigraphy and its use in correlation although other stratigraphical and geochronological tools have also been applied. Sediment sequences from three different sites located in northern and central Finnish Lapland and Northern Ostrobothnia, central western part of Finland, were studied using stratigraphical and dating methods. Furthermore, a safer heavy liquid pollen preparation method for minerogenic sediments was introduced and validated. Based on the results, it is suggested that the modified LST Fastfloat method gives comparable results compared to the conventional hydrofluoric acid (HF) method. The thesis provides new geochronologically and biostratigraphically constrained data to establish the more complete stratigraphy for northern and central Finland and beyond. Results indicate that the ice sheet advanced further south than previously thought during the Early Weichselian Herning stadial (MIS 5d). Results also strengthen the view that ice-free conditions prevailed during the Middle Weichselian (MIS 3) stage. Moreover, results from the Kaarreoja site from northern Finnish Lapland indicate that the ...
author2 Lunkka, J. (Juha Pekka)
format Doctoral or Postdoctoral Thesis
author Eskola, T. (Tiina)
author_facet Eskola, T. (Tiina)
author_sort Eskola, T. (Tiina)
title The late Middle and Late Pleistocene environmental and glaciation history of Northern Ostrobothnia and Finnish Lapland
title_short The late Middle and Late Pleistocene environmental and glaciation history of Northern Ostrobothnia and Finnish Lapland
title_full The late Middle and Late Pleistocene environmental and glaciation history of Northern Ostrobothnia and Finnish Lapland
title_fullStr The late Middle and Late Pleistocene environmental and glaciation history of Northern Ostrobothnia and Finnish Lapland
title_full_unstemmed The late Middle and Late Pleistocene environmental and glaciation history of Northern Ostrobothnia and Finnish Lapland
title_sort late middle and late pleistocene environmental and glaciation history of northern ostrobothnia and finnish lapland
publisher Oulun yliopisto
publishDate 2021
url http://urn.fi/urn:isbn:9789526231792
genre Fennoscandia
Ice Sheet
Lapland
genre_facet Fennoscandia
Ice Sheet
Lapland
op_relation info:eu-repo/semantics/altIdentifier/pissn/0358-2477
info:eu-repo/semantics/altIdentifier/eissn/2489-7957
op_rights info:eu-repo/semantics/openAccess
© University of Oulu, 2021
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