Reconstructing a continuous Holocene composite sedimentary record for the eastern Gotland Deep, Baltic Sea
It has been generally assumed that sediments in the deepest parts of the Gotland Basin have accumulated in a relatively calm depositional environment during the entire Holocene, thus representing a continuous sedimentary record. As part of the Baltic Sea System Study (BASYS) we have had access to se...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/578129 2024-09-15T18:00:10+00:00 Reconstructing a continuous Holocene composite sedimentary record for the eastern Gotland Deep, Baltic Sea Kotilainen, A.T. Hämäläinen, J.M.S. Winterhalter, B. 2024-06-27T13:44:42Z 1-12 application/pdf http://hdl.handle.net/10138/578129 eng eng Boreal Environment Research Publishing Board Boreal Environment Research 1239-6095 1797-2469 1 7 http://hdl.handle.net/10138/578129 Suomen ympäristökeskus CC BY 4.0 openAccess Artikkeli lehdessä 2024 ftunivhelsihelda 2024-08-21T23:48:04Z It has been generally assumed that sediments in the deepest parts of the Gotland Basin have accumulated in a relatively calm depositional environment during the entire Holocene, thus representing a continuous sedimentary record. As part of the Baltic Sea System Study (BASYS) we have had access to several long cores from the Gotland Deep, which we have investigated in detail. The study, utilising sediment physical properties (e.g., magnetic susceptibility) and lithostratigraphic (core descriptions, photographs, stereo X-ray radiographs) data, has shown that even over very short horizontal distances the sedimentary records reflect considerable variations in sediment accumulation. Definable sedimentary units show marked variation in thickness, including clear hiatuses. These indicate that environmental conditions have been far more dynamic than has been previously assumed, and that the patchy nature of sediment deposition in the Baltic Sea is characteristic also to the Gotland Deep. This is true especially of the Litorina Sea, Post-Litorina Sea and Recent Baltic Sea stages of the Baltic Sea (~ past 7500–8000 cal years BP). Due to the fact that sediment stratigraphy can change a lot even over very short distances in this deep basin, correlation between different cores should be done with great care. To produce a stratigraphically continuous sequence for the Gotland Deep, we have spliced data together from several different cores. Article in Journal/Newspaper Boreal Environment Research HELDA – University of Helsinki Open Repository |
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Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
description |
It has been generally assumed that sediments in the deepest parts of the Gotland Basin have accumulated in a relatively calm depositional environment during the entire Holocene, thus representing a continuous sedimentary record. As part of the Baltic Sea System Study (BASYS) we have had access to several long cores from the Gotland Deep, which we have investigated in detail. The study, utilising sediment physical properties (e.g., magnetic susceptibility) and lithostratigraphic (core descriptions, photographs, stereo X-ray radiographs) data, has shown that even over very short horizontal distances the sedimentary records reflect considerable variations in sediment accumulation. Definable sedimentary units show marked variation in thickness, including clear hiatuses. These indicate that environmental conditions have been far more dynamic than has been previously assumed, and that the patchy nature of sediment deposition in the Baltic Sea is characteristic also to the Gotland Deep. This is true especially of the Litorina Sea, Post-Litorina Sea and Recent Baltic Sea stages of the Baltic Sea (~ past 7500–8000 cal years BP). Due to the fact that sediment stratigraphy can change a lot even over very short distances in this deep basin, correlation between different cores should be done with great care. To produce a stratigraphically continuous sequence for the Gotland Deep, we have spliced data together from several different cores. |
format |
Article in Journal/Newspaper |
author |
Kotilainen, A.T. Hämäläinen, J.M.S. Winterhalter, B. |
spellingShingle |
Kotilainen, A.T. Hämäläinen, J.M.S. Winterhalter, B. Reconstructing a continuous Holocene composite sedimentary record for the eastern Gotland Deep, Baltic Sea |
author_facet |
Kotilainen, A.T. Hämäläinen, J.M.S. Winterhalter, B. |
author_sort |
Kotilainen, A.T. |
title |
Reconstructing a continuous Holocene composite sedimentary record for the eastern Gotland Deep, Baltic Sea |
title_short |
Reconstructing a continuous Holocene composite sedimentary record for the eastern Gotland Deep, Baltic Sea |
title_full |
Reconstructing a continuous Holocene composite sedimentary record for the eastern Gotland Deep, Baltic Sea |
title_fullStr |
Reconstructing a continuous Holocene composite sedimentary record for the eastern Gotland Deep, Baltic Sea |
title_full_unstemmed |
Reconstructing a continuous Holocene composite sedimentary record for the eastern Gotland Deep, Baltic Sea |
title_sort |
reconstructing a continuous holocene composite sedimentary record for the eastern gotland deep, baltic sea |
publisher |
Boreal Environment Research Publishing Board |
publishDate |
2024 |
url |
http://hdl.handle.net/10138/578129 |
genre |
Boreal Environment Research |
genre_facet |
Boreal Environment Research |
op_relation |
Boreal Environment Research 1239-6095 1797-2469 1 7 http://hdl.handle.net/10138/578129 Suomen ympäristökeskus |
op_rights |
CC BY 4.0 openAccess |
_version_ |
1810437317802852352 |