Danopolonian migmatization of Mesoproterozoic sedimentary rocks in southernmost Sweden: a SIMS zircon study
To assess the age and origin of the metasedimentary migmatites in southernmost Sweden and their relationships with the Mesoproterozoic granitoid magmatism in the area, we have dated migmatite zircon using the secondary ion mass spectrometry U-Pb method. The studied metasedimentary migmatites, here c...
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2014
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Online Access: | https://lup.lub.lu.se/record/4659382 https://doi.org/10.1080/11035897.2013.855815 |
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ftulundlup:oai:lup.lub.lu.se:3ce8a743-aab9-4ba4-addf-ba8fba4eae94 2023-05-15T16:13:04+02:00 Danopolonian migmatization of Mesoproterozoic sedimentary rocks in southernmost Sweden: a SIMS zircon study Bogdanova, Svetlana Cecys, Audrius Bibikova, Elena V. Ilyinsky, Lev S. Taran, Ludmila N. 2014 https://lup.lub.lu.se/record/4659382 https://doi.org/10.1080/11035897.2013.855815 eng eng Taylor & Francis https://lup.lub.lu.se/record/4659382 http://dx.doi.org/10.1080/11035897.2013.855815 wos:000340263300007 scopus:84905092476 GFF; 136(2), pp 410-428 (2014) ISSN: 2000-0863 Geology Mesoproterozoic zircon age metasediments migmatization Danopolonian orogeny Baltic/Fennoscandian Shield contributiontojournal/article info:eu-repo/semantics/article text 2014 ftulundlup https://doi.org/10.1080/11035897.2013.855815 2023-02-01T23:29:35Z To assess the age and origin of the metasedimentary migmatites in southernmost Sweden and their relationships with the Mesoproterozoic granitoid magmatism in the area, we have dated migmatite zircon using the secondary ion mass spectrometry U-Pb method. The studied metasedimentary migmatites, here called the Noteboda migmatites, occur along the southwestern boundary of the 1442 Ma Taghusa granitoid intrusion in southeastern Skane. They contain the mineral assemblage garnet + biotite +/- muscovite + cordierite + sillimanite + quartz + plagioclase + K-feldspar and were formed during a retrograde evolution from c. 750-720 degrees C and 6 kbar (peak conditions) to c. 675 degrees C and 4 kbar. Zircon is characterized by detrital cores surrounded by U-rich rims and overgrowths. Separate rounded metamorphic grains also exist. The age probability-density distribution peaks for detrital zircon are at c. 1700, 1670, 1650, 1610, 1570 and 1530 Ma. These ages suggest Gothian orogenic rocks in the present west as the most probable principal source. Sedimentation occurred after c. 1530 Ma, the age of the youngest detrital zircon, indicating the existence of a previously unknown period of Mesoproterozoic sedimentation in southernmost Sweden. A homogeneous zircon overgrowth yielded a concordant Pb-207/Pb-206 age of 1439 +/- 5 Ma, which dates the migmatization and is close to the age of the Taghusa intrusion. We conclude that the burial of the sediments down to c. 20 km, their metamorphism and progressive migmatization took place concurrently with granitic magmatism, NE-SW compression, folding and shearing of the crust between 1460 and 1440Ma during the Danopolonian orogeny. Article in Journal/Newspaper Fennoscandian Lund University Publications (LUP) GFF 136 2 410 428 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology Mesoproterozoic zircon age metasediments migmatization Danopolonian orogeny Baltic/Fennoscandian Shield |
spellingShingle |
Geology Mesoproterozoic zircon age metasediments migmatization Danopolonian orogeny Baltic/Fennoscandian Shield Bogdanova, Svetlana Cecys, Audrius Bibikova, Elena V. Ilyinsky, Lev S. Taran, Ludmila N. Danopolonian migmatization of Mesoproterozoic sedimentary rocks in southernmost Sweden: a SIMS zircon study |
topic_facet |
Geology Mesoproterozoic zircon age metasediments migmatization Danopolonian orogeny Baltic/Fennoscandian Shield |
description |
To assess the age and origin of the metasedimentary migmatites in southernmost Sweden and their relationships with the Mesoproterozoic granitoid magmatism in the area, we have dated migmatite zircon using the secondary ion mass spectrometry U-Pb method. The studied metasedimentary migmatites, here called the Noteboda migmatites, occur along the southwestern boundary of the 1442 Ma Taghusa granitoid intrusion in southeastern Skane. They contain the mineral assemblage garnet + biotite +/- muscovite + cordierite + sillimanite + quartz + plagioclase + K-feldspar and were formed during a retrograde evolution from c. 750-720 degrees C and 6 kbar (peak conditions) to c. 675 degrees C and 4 kbar. Zircon is characterized by detrital cores surrounded by U-rich rims and overgrowths. Separate rounded metamorphic grains also exist. The age probability-density distribution peaks for detrital zircon are at c. 1700, 1670, 1650, 1610, 1570 and 1530 Ma. These ages suggest Gothian orogenic rocks in the present west as the most probable principal source. Sedimentation occurred after c. 1530 Ma, the age of the youngest detrital zircon, indicating the existence of a previously unknown period of Mesoproterozoic sedimentation in southernmost Sweden. A homogeneous zircon overgrowth yielded a concordant Pb-207/Pb-206 age of 1439 +/- 5 Ma, which dates the migmatization and is close to the age of the Taghusa intrusion. We conclude that the burial of the sediments down to c. 20 km, their metamorphism and progressive migmatization took place concurrently with granitic magmatism, NE-SW compression, folding and shearing of the crust between 1460 and 1440Ma during the Danopolonian orogeny. |
format |
Article in Journal/Newspaper |
author |
Bogdanova, Svetlana Cecys, Audrius Bibikova, Elena V. Ilyinsky, Lev S. Taran, Ludmila N. |
author_facet |
Bogdanova, Svetlana Cecys, Audrius Bibikova, Elena V. Ilyinsky, Lev S. Taran, Ludmila N. |
author_sort |
Bogdanova, Svetlana |
title |
Danopolonian migmatization of Mesoproterozoic sedimentary rocks in southernmost Sweden: a SIMS zircon study |
title_short |
Danopolonian migmatization of Mesoproterozoic sedimentary rocks in southernmost Sweden: a SIMS zircon study |
title_full |
Danopolonian migmatization of Mesoproterozoic sedimentary rocks in southernmost Sweden: a SIMS zircon study |
title_fullStr |
Danopolonian migmatization of Mesoproterozoic sedimentary rocks in southernmost Sweden: a SIMS zircon study |
title_full_unstemmed |
Danopolonian migmatization of Mesoproterozoic sedimentary rocks in southernmost Sweden: a SIMS zircon study |
title_sort |
danopolonian migmatization of mesoproterozoic sedimentary rocks in southernmost sweden: a sims zircon study |
publisher |
Taylor & Francis |
publishDate |
2014 |
url |
https://lup.lub.lu.se/record/4659382 https://doi.org/10.1080/11035897.2013.855815 |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_source |
GFF; 136(2), pp 410-428 (2014) ISSN: 2000-0863 |
op_relation |
https://lup.lub.lu.se/record/4659382 http://dx.doi.org/10.1080/11035897.2013.855815 wos:000340263300007 scopus:84905092476 |
op_doi |
https://doi.org/10.1080/11035897.2013.855815 |
container_title |
GFF |
container_volume |
136 |
container_issue |
2 |
container_start_page |
410 |
op_container_end_page |
428 |
_version_ |
1765998669334577152 |