Change search
ReferencesLink to record
Permanent link

Direct link
Seismic stratigraphy, architecture and outcrop pattern of the Wenlock-Pridoli sequence offshore Saaremaa, Baltic Sea
Stockholm University, Faculty of Science, Department of Geological Sciences.
2011 (English)In: Marine Geology, ISSN 0025-3227, E-ISSN 1872-6151, Vol. 281, no 1-4, 14-26 p.Article in journal (Refereed) Published
Abstract [en]

The Wenlock-Pridoli sequence has been subdivided and mapped offshore Saaremaa in the Baltic Sea by means of high resolution seismic reflection profiling. The most striking and consistent seismic reflectors correlate with contrasting lithological boundaries of the Silurian regional stages, the Jaani/Jaagarahu (S(8)), the Jaagarahu/Rootsikula (S(10)), the Rootsikula/Paadla (S(11)). the Paadla/Kuressaare (S(12)), the Kuressaare/Kaugatuma (S(13)) and the Kaugatuma/Ohesaare (S(14)) stages, which often coincide with erosional disconformities on Saaremaa. The shallow-shelf Silurian sequence that crops out on Saaremaa is also exposed in the closest offshore area of the island. Due to the westerly to south-westerly increasing erosional cut below the Baltic, the deeper facies varieties that are concealed in southern Saaremaa, are revealed and exposed at the seafloor towards Gotland. This is particularly well expressed in the Jaagarahu Stage, which undergoes a fades change with significant increase in thickness on the basinal slope of the Baltic Silurian Basin, both onshore and offshore Saaremaa. The Silurian sequence overlying the Jaagarahu Stage does not show any considerable thickness or fades changes neither below nor offshore Saaremaa. Offshore Saaremaa, seismic reflectors limiting new deeper facies subunits in the Jaagarahu Stage become either successively or simultaneously exposed inside the Vilsandi (S(8)-S(9)) respectively the Maasi-Tagavere (S(9)-S(10)) seismic units towards Gotland. These outcrop patterns were largely formed by two different erosional agents that during different time periods have played a considerable role in the formation of the present day Baltic Sea depression. Hence, the gradually south-westerly deepening cuesta landscape formed by the Cenozoic erosion, namely the Silurian Klint and the plateaus north and south of it, discloses progressively deeper part of the Baltic Silurian Basin. The deeper facies subunits are exposed rapidly by the submeridional erosional incisions of the Pleistocene glaciers. Except for the erosional component, there appears also a distinct tectonic factor in the genesis of the present Baltic Sea depression. Today, the coeval Silurian rocks that once were formed in separate facies belts, i.e. in different depth intervals of the same sedimentary basin on Saaremaa and on Gotland, are presently located at about equal altitude.

Place, publisher, year, edition, pages
2011. Vol. 281, no 1-4, 14-26 p.
Keyword [en]
Baltic Silurian Basin, Wenlock-Pridoli, Saaremaa, seismic correlation, Baltic Sea depression
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:su:diva-69428DOI: 10.1016/j.margeo.2011.01.003ISI: 000289604300002OAI: diva2:478271
authorCount :2Available from: 2012-01-16 Created: 2012-01-12 Last updated: 2012-01-16Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Flodén, Tom
By organisation
Department of Geological Sciences
In the same journal
Marine Geology
Earth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 106 hits
ReferencesLink to record
Permanent link

Direct link