Periglacial evidence for a 1.91–1.89 Ga old glacial period at low latitude, Central Sweden
Cryoturbation and slump fold‐like sedimentary structures in ca. 1.9 Ga old dacitic metavolcanic sediments in West Bergslagen, Central Sweden, are recognized as a lowland periglacial environment. This type of environment is comparable with present day tundra in Siberia. Ice‐wedge casts and cryoturbat...
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crwiley:10.1111/gto.12027 2024-06-02T08:08:02+00:00 Periglacial evidence for a 1.91–1.89 Ga old glacial period at low latitude, Central Sweden Kuipers, Gerrit Beunk, Frank F. van der Wateren, Frederik M. 2013 http://dx.doi.org/10.1111/gto.12027 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgto.12027 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gto.12027 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Geology Today volume 29, issue 6, page 218-221 ISSN 0266-6979 1365-2451 journal-article 2013 crwiley https://doi.org/10.1111/gto.12027 2024-05-03T10:57:01Z Cryoturbation and slump fold‐like sedimentary structures in ca. 1.9 Ga old dacitic metavolcanic sediments in West Bergslagen, Central Sweden, are recognized as a lowland periglacial environment. This type of environment is comparable with present day tundra in Siberia. Ice‐wedge casts and cryoturbation, together with polygonal frost patterns, are typical geomorphological structures above permafrost in this type of environment. The sedimentary environment could be interpreted as periglacial, broadly comparable to present day tundras. Intensive cryoturbation of the formation and close structural analogy with Quaternary ice‐wedges suggests a cold and humid environment. This discovery is corroborated by a previous report of glacial sediments and structures from NW Australia of ca. 1.8 Ga age. Both occurrences developed at low geographical latitudes, at locations far apart in the Late Palaeoproterozoic supercontinent Columbia. Either suggest the existence of a ca. 100 Ma long epoch of extreme, though possibly intermittent glaciations during the ca. 1.4 Ga long ‘Proterozoic gap’ (∼2.2–0.77 Ga) from which no convincing glacial deposits were previously known. Article in Journal/Newspaper Ice permafrost Tundra wedge* Siberia Wiley Online Library Geology Today 29 6 218 221 |
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English |
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Cryoturbation and slump fold‐like sedimentary structures in ca. 1.9 Ga old dacitic metavolcanic sediments in West Bergslagen, Central Sweden, are recognized as a lowland periglacial environment. This type of environment is comparable with present day tundra in Siberia. Ice‐wedge casts and cryoturbation, together with polygonal frost patterns, are typical geomorphological structures above permafrost in this type of environment. The sedimentary environment could be interpreted as periglacial, broadly comparable to present day tundras. Intensive cryoturbation of the formation and close structural analogy with Quaternary ice‐wedges suggests a cold and humid environment. This discovery is corroborated by a previous report of glacial sediments and structures from NW Australia of ca. 1.8 Ga age. Both occurrences developed at low geographical latitudes, at locations far apart in the Late Palaeoproterozoic supercontinent Columbia. Either suggest the existence of a ca. 100 Ma long epoch of extreme, though possibly intermittent glaciations during the ca. 1.4 Ga long ‘Proterozoic gap’ (∼2.2–0.77 Ga) from which no convincing glacial deposits were previously known. |
format |
Article in Journal/Newspaper |
author |
Kuipers, Gerrit Beunk, Frank F. van der Wateren, Frederik M. |
spellingShingle |
Kuipers, Gerrit Beunk, Frank F. van der Wateren, Frederik M. Periglacial evidence for a 1.91–1.89 Ga old glacial period at low latitude, Central Sweden |
author_facet |
Kuipers, Gerrit Beunk, Frank F. van der Wateren, Frederik M. |
author_sort |
Kuipers, Gerrit |
title |
Periglacial evidence for a 1.91–1.89 Ga old glacial period at low latitude, Central Sweden |
title_short |
Periglacial evidence for a 1.91–1.89 Ga old glacial period at low latitude, Central Sweden |
title_full |
Periglacial evidence for a 1.91–1.89 Ga old glacial period at low latitude, Central Sweden |
title_fullStr |
Periglacial evidence for a 1.91–1.89 Ga old glacial period at low latitude, Central Sweden |
title_full_unstemmed |
Periglacial evidence for a 1.91–1.89 Ga old glacial period at low latitude, Central Sweden |
title_sort |
periglacial evidence for a 1.91–1.89 ga old glacial period at low latitude, central sweden |
publisher |
Wiley |
publishDate |
2013 |
url |
http://dx.doi.org/10.1111/gto.12027 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgto.12027 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gto.12027 |
genre |
Ice permafrost Tundra wedge* Siberia |
genre_facet |
Ice permafrost Tundra wedge* Siberia |
op_source |
Geology Today volume 29, issue 6, page 218-221 ISSN 0266-6979 1365-2451 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/gto.12027 |
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Geology Today |
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29 |
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6 |
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218 |
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221 |
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1800753186100740096 |