Chronology of Late Saalian and Middle Weichselian episodes of ice-free lacustrine sedimentation recorded in the Arumetsa section, southwestern Estonia
The information obtained from a 21 m thick open-pit section of silty-clayey sediments in the Arumetsa bedrock valley, southwestern Estonia, revealed that lacustrine to glaciolacustrine sedimentation at the site started prior to 151 ka ago and lasted to about the end of marine isotope stage 6 (MIS6)...
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2010-06-01
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doaj-3cbcea4576c04093a362dba20ae577002020-11-24T20:53:08ZengEstonian Academy PublishersEstonian Journal of Earth Sciences1736-47282010-06-0159212514010.3176/earth.2010.2.03Chronology of Late Saalian and Middle Weichselian episodes of ice-free lacustrine sedimentation recorded in the Arumetsa section, southwestern EstoniaMaris RattasVolli KalmKersti KihnoElsbet LiivrandOive TinnKati Tänavsuu-MilkevicieneMaire SaksonThe information obtained from a 21 m thick open-pit section of silty-clayey sediments in the Arumetsa bedrock valley, southwestern Estonia, revealed that lacustrine to glaciolacustrine sedimentation at the site started prior to 151 ka ago and lasted to about the end of marine isotope stage 6 (MIS6) at 130 ka. Further down from the 151 ka age-level to the bottom of the buried valley there are ca 60 m of lacustrine fine-grained sediments, the age of which remains still unclear. The Late Saalian sediments at Arumetsa are discordantly overlain by Middle Weichselian clay, silt and sand, deposited between ca 44 and 37 ka ago. As testified by optically stimulated luminescence (OSL) ages, and pollen and diatom record, the Middle Weichselian fine-grained sediments contain redeposited Holsteinian but no Eemian pollen, and have not been fully bleached during deposition. Chronological, microfossil and sedimentological data show two hiatuses in the Arumetsa section. The first hiatus has left no sedimentary evidence for the period between ca 130 ka and 44 ka ago (MIS5 to older half of MIS3). The younger hiatus from ca 37 to 22 ka occurs between the Middle Weichselian lacustrine silt and the Late Weichselian till layer on top of the section.http://www.eap.ee/public/Estonian_Journal_of_Earth_Sciences/2010/issue_2/earth-2010-2-125-140.pdfLate SaalianMiddle WeichselianOSL dates14C datespollenostracodsdiatomsEstonia |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Maris Rattas Volli Kalm Kersti Kihno Elsbet Liivrand Oive Tinn Kati Tänavsuu-Milkeviciene Maire Sakson |
spellingShingle |
Maris Rattas Volli Kalm Kersti Kihno Elsbet Liivrand Oive Tinn Kati Tänavsuu-Milkeviciene Maire Sakson Chronology of Late Saalian and Middle Weichselian episodes of ice-free lacustrine sedimentation recorded in the Arumetsa section, southwestern Estonia Estonian Journal of Earth Sciences Late Saalian Middle Weichselian OSL dates 14C dates pollen ostracods diatoms Estonia |
author_facet |
Maris Rattas Volli Kalm Kersti Kihno Elsbet Liivrand Oive Tinn Kati Tänavsuu-Milkeviciene Maire Sakson |
author_sort |
Maris Rattas |
title |
Chronology of Late Saalian and Middle Weichselian episodes of ice-free lacustrine sedimentation recorded in the Arumetsa section, southwestern Estonia |
title_short |
Chronology of Late Saalian and Middle Weichselian episodes of ice-free lacustrine sedimentation recorded in the Arumetsa section, southwestern Estonia |
title_full |
Chronology of Late Saalian and Middle Weichselian episodes of ice-free lacustrine sedimentation recorded in the Arumetsa section, southwestern Estonia |
title_fullStr |
Chronology of Late Saalian and Middle Weichselian episodes of ice-free lacustrine sedimentation recorded in the Arumetsa section, southwestern Estonia |
title_full_unstemmed |
Chronology of Late Saalian and Middle Weichselian episodes of ice-free lacustrine sedimentation recorded in the Arumetsa section, southwestern Estonia |
title_sort |
chronology of late saalian and middle weichselian episodes of ice-free lacustrine sedimentation recorded in the arumetsa section, southwestern estonia |
publisher |
Estonian Academy Publishers |
series |
Estonian Journal of Earth Sciences |
issn |
1736-4728 |
publishDate |
2010-06-01 |
description |
The information obtained from a 21 m thick open-pit section of silty-clayey sediments in the Arumetsa bedrock valley, southwestern Estonia, revealed that lacustrine to glaciolacustrine sedimentation at the site started prior to 151 ka ago and lasted to about the end of marine isotope stage 6 (MIS6) at 130 ka. Further down from the 151 ka age-level to the bottom of the buried valley there are ca 60 m of lacustrine fine-grained sediments, the age of which remains still unclear. The Late Saalian sediments at Arumetsa are discordantly overlain by Middle Weichselian clay, silt and sand, deposited between ca 44 and 37 ka ago. As testified by optically stimulated luminescence (OSL) ages, and pollen and diatom record, the Middle Weichselian fine-grained sediments contain redeposited Holsteinian but no Eemian pollen, and have not been fully bleached during deposition. Chronological, microfossil and sedimentological data show two hiatuses in the Arumetsa section. The first hiatus has left no sedimentary evidence for the period between ca 130 ka and 44 ka ago (MIS5 to older half of MIS3). The younger hiatus from ca 37 to 22 ka occurs between the Middle Weichselian lacustrine silt and the Late Weichselian till layer on top of the section. |
topic |
Late Saalian Middle Weichselian OSL dates 14C dates pollen ostracods diatoms Estonia |
url |
http://www.eap.ee/public/Estonian_Journal_of_Earth_Sciences/2010/issue_2/earth-2010-2-125-140.pdf |
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