Stratigraphical section through Lower Cambrian at Söderfjärden, Vaasa, western Finland
The Lower Cambrian sedimentary rocks form a doughnut-shaped deposit on the bottom of the Söderfjärden depression. The sedimentary pile was first established and has now been penetrated by drilling. The remaining thickness of sedimentary rocks at the drilling site is 244 m under 74 m of glacial overb...
Published in: | Bulletin of the Geological Society of Finland |
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Geological Society of Finland
1982
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ftdoajarticles:oai:doaj.org/article:79fe441283be4c6eb5dd16135de9d971 2023-05-15T16:12:56+02:00 Stratigraphical section through Lower Cambrian at Söderfjärden, Vaasa, western Finland J.J. Lehtovaara 1982-12-01T00:00:00Z https://doi.org/10.17741/bgsf/54.1-2.004 https://doaj.org/article/79fe441283be4c6eb5dd16135de9d971 EN eng Geological Society of Finland http://www.geologinenseura.fi/bulletin/Volume54/sgs_bt_054_pages_035_043.pdf https://doaj.org/toc/0367-5211 https://doaj.org/toc/1799-4632 doi:10.17741/bgsf/54.1-2.004 0367-5211 1799-4632 https://doaj.org/article/79fe441283be4c6eb5dd16135de9d971 Bulletin of the Geological Society of Finland, Vol 54, Iss 1-2, Pp 35-43 (1982) Geology QE1-996.5 article 1982 ftdoajarticles https://doi.org/10.17741/bgsf/54.1-2.004 2022-12-31T08:52:54Z The Lower Cambrian sedimentary rocks form a doughnut-shaped deposit on the bottom of the Söderfjärden depression. The sedimentary pile was first established and has now been penetrated by drilling. The remaining thickness of sedimentary rocks at the drilling site is 244 m under 74 m of glacial overburden. Sediments in the lower half of the sequence are clayey and continue in the upper half mixed with sandy and silty beds. Thin phosphoritic conglomerates intercalate with any other rocks. Syndepositionary sedimentary structures and penecontemporaneous soft-state deformations are well preserved in these completely unmetamorphosed rocks. Indications of rapid basin filling are met with throughout the sequence. A volcanic origin of Söderfjärden basin, Lower Cambrian in age, is claimed to have implications with coeval alkaline magmatism in the Fennoscandian Shield. Article in Journal/Newspaper Fennoscandian Directory of Open Access Journals: DOAJ Articles Bulletin of the Geological Society of Finland 54 1-2 35 43 |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geology QE1-996.5 |
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Geology QE1-996.5 J.J. Lehtovaara Stratigraphical section through Lower Cambrian at Söderfjärden, Vaasa, western Finland |
topic_facet |
Geology QE1-996.5 |
description |
The Lower Cambrian sedimentary rocks form a doughnut-shaped deposit on the bottom of the Söderfjärden depression. The sedimentary pile was first established and has now been penetrated by drilling. The remaining thickness of sedimentary rocks at the drilling site is 244 m under 74 m of glacial overburden. Sediments in the lower half of the sequence are clayey and continue in the upper half mixed with sandy and silty beds. Thin phosphoritic conglomerates intercalate with any other rocks. Syndepositionary sedimentary structures and penecontemporaneous soft-state deformations are well preserved in these completely unmetamorphosed rocks. Indications of rapid basin filling are met with throughout the sequence. A volcanic origin of Söderfjärden basin, Lower Cambrian in age, is claimed to have implications with coeval alkaline magmatism in the Fennoscandian Shield. |
format |
Article in Journal/Newspaper |
author |
J.J. Lehtovaara |
author_facet |
J.J. Lehtovaara |
author_sort |
J.J. Lehtovaara |
title |
Stratigraphical section through Lower Cambrian at Söderfjärden, Vaasa, western Finland |
title_short |
Stratigraphical section through Lower Cambrian at Söderfjärden, Vaasa, western Finland |
title_full |
Stratigraphical section through Lower Cambrian at Söderfjärden, Vaasa, western Finland |
title_fullStr |
Stratigraphical section through Lower Cambrian at Söderfjärden, Vaasa, western Finland |
title_full_unstemmed |
Stratigraphical section through Lower Cambrian at Söderfjärden, Vaasa, western Finland |
title_sort |
stratigraphical section through lower cambrian at söderfjärden, vaasa, western finland |
publisher |
Geological Society of Finland |
publishDate |
1982 |
url |
https://doi.org/10.17741/bgsf/54.1-2.004 https://doaj.org/article/79fe441283be4c6eb5dd16135de9d971 |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_source |
Bulletin of the Geological Society of Finland, Vol 54, Iss 1-2, Pp 35-43 (1982) |
op_relation |
http://www.geologinenseura.fi/bulletin/Volume54/sgs_bt_054_pages_035_043.pdf https://doaj.org/toc/0367-5211 https://doaj.org/toc/1799-4632 doi:10.17741/bgsf/54.1-2.004 0367-5211 1799-4632 https://doaj.org/article/79fe441283be4c6eb5dd16135de9d971 |
op_doi |
https://doi.org/10.17741/bgsf/54.1-2.004 |
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Bulletin of the Geological Society of Finland |
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54 |
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1-2 |
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35 |
op_container_end_page |
43 |
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1765998537676423168 |