Timing of sedimentation, metamorphism, and plutonism in the Helgeland Nappe Complex, north-central Norwegian Caledonides
The Helgeland Nappe Complex consists of a sequence of imbricated east-dipping nappes that record a history of Neoproterozoic–Ordovician, sedimentary, metamorphic, and magmatic events. A combination of U-Pb dating of zircon and titanite by laserablation–inductively coupled plasma–mass spectrometry pl...
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ftqueensland:oai:eprints.qut.edu.au:117839 2024-02-11T10:04:34+01:00 Timing of sedimentation, metamorphism, and plutonism in the Helgeland Nappe Complex, north-central Norwegian Caledonides Barnes, Calvin G. Frost, Carol D. Yoshinobu, Aaron S. McArthur, Kelsey Barnes, Melanie A. Allen, Charlotte M. Nordgulen, �ystein Prestvik, Tore 2007 application/pdf https://eprints.qut.edu.au/117839/ unknown Geological Society of America https://eprints.qut.edu.au/117839/1/117839.pdf doi:10.1130/GES00138.1 Barnes, Calvin G., Frost, Carol D., Yoshinobu, Aaron S., McArthur, Kelsey, Barnes, Melanie A., Allen, Charlotte M., Nordgulen, �ystein, & Prestvik, Tore (2007) Timing of sedimentation, metamorphism, and plutonism in the Helgeland Nappe Complex, north-central Norwegian Caledonides. Geosphere, 3(6), pp. 683-703. https://eprints.qut.edu.au/117839/ Institute for Future Environments; Science & Engineering Faculty; School of Earth, Environmental & Biological Sciences free_to_read 2007 Geological Society of America This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au Geosphere Norway Caledonides zircon geochronology zircon Contribution to Journal 2007 ftqueensland https://doi.org/10.1130/GES00138.1 2024-01-15T23:22:08Z The Helgeland Nappe Complex consists of a sequence of imbricated east-dipping nappes that record a history of Neoproterozoic–Ordovician, sedimentary, metamorphic, and magmatic events. A combination of U-Pb dating of zircon and titanite by laserablation–inductively coupled plasma–mass spectrometry plus chemostratigraphic data on marbles places tight constraints on the sedimentary, tectonic, and thermal events of the complex. Strontium and carbon isotope data have identified Neoproterozoic marbles in the Lower Nappe, the Horta nappe, and Scandian-aged infolds in the Vikna region. The environment of deposition of these rocks was a continental shelf, presumably of Laurentia. Detrital zircon ages from the Lower Nappe are nearly identical to those of Dalradian sedimentary rocks in Scotland. Cambrian rifting caused development of one or more ophiolitefloored basins, into which thick sequences of Early Ordovician clastic and carbonate sediments were deposited. On the basis of ages of the youngest zircons, deposition ended after ca. 481 Ma. These basin units are now seen as the Skei Group, Sauren-Torghatten Nappe, and Middle Nappe, as well as the stratigraphically highest part of the Horta nappe and possibly of the Upper Nappe. The provenance of these sediments was partly from the Lower Nappe, on the basis of detrital zircon age populations in metasandstones and cobbles from proximal conglomerates. However, the source of Cambrian–Ordovician zircons in all of the Early Ordovician basins is enigmatic. Crustal anatexis of the Lower and Upper Nappes occurred ca. 480 Ma, followed by imbrication of the entire nappe sequence. By ca. 478 Ma, the Horta nappe was overturned and was at the structural base of the nappe sequence, where it underwent migmatization and was the source of Stype magmas. Diverse magmatic activity followed ca. 465 Ma, 450–445 Ma, and 439–424 Ma. Several plutons in the youngest age range contain inherited 460–450 Ma zircons. Article in Journal/Newspaper Helgeland Torghatten Queensland University of Technology: QUT ePrints Helgeland Norway Vikna ENVELOPE(11.242,11.242,64.864,64.864) Sauren ENVELOPE(12.119,12.119,65.474,65.474) Skei ENVELOPE(12.527,12.527,66.136,66.136) Geosphere 3 6 683 |
institution |
Open Polar |
collection |
Queensland University of Technology: QUT ePrints |
op_collection_id |
ftqueensland |
language |
unknown |
topic |
Norway Caledonides zircon geochronology zircon |
spellingShingle |
Norway Caledonides zircon geochronology zircon Barnes, Calvin G. Frost, Carol D. Yoshinobu, Aaron S. McArthur, Kelsey Barnes, Melanie A. Allen, Charlotte M. Nordgulen, �ystein Prestvik, Tore Timing of sedimentation, metamorphism, and plutonism in the Helgeland Nappe Complex, north-central Norwegian Caledonides |
topic_facet |
Norway Caledonides zircon geochronology zircon |
description |
The Helgeland Nappe Complex consists of a sequence of imbricated east-dipping nappes that record a history of Neoproterozoic–Ordovician, sedimentary, metamorphic, and magmatic events. A combination of U-Pb dating of zircon and titanite by laserablation–inductively coupled plasma–mass spectrometry plus chemostratigraphic data on marbles places tight constraints on the sedimentary, tectonic, and thermal events of the complex. Strontium and carbon isotope data have identified Neoproterozoic marbles in the Lower Nappe, the Horta nappe, and Scandian-aged infolds in the Vikna region. The environment of deposition of these rocks was a continental shelf, presumably of Laurentia. Detrital zircon ages from the Lower Nappe are nearly identical to those of Dalradian sedimentary rocks in Scotland. Cambrian rifting caused development of one or more ophiolitefloored basins, into which thick sequences of Early Ordovician clastic and carbonate sediments were deposited. On the basis of ages of the youngest zircons, deposition ended after ca. 481 Ma. These basin units are now seen as the Skei Group, Sauren-Torghatten Nappe, and Middle Nappe, as well as the stratigraphically highest part of the Horta nappe and possibly of the Upper Nappe. The provenance of these sediments was partly from the Lower Nappe, on the basis of detrital zircon age populations in metasandstones and cobbles from proximal conglomerates. However, the source of Cambrian–Ordovician zircons in all of the Early Ordovician basins is enigmatic. Crustal anatexis of the Lower and Upper Nappes occurred ca. 480 Ma, followed by imbrication of the entire nappe sequence. By ca. 478 Ma, the Horta nappe was overturned and was at the structural base of the nappe sequence, where it underwent migmatization and was the source of Stype magmas. Diverse magmatic activity followed ca. 465 Ma, 450–445 Ma, and 439–424 Ma. Several plutons in the youngest age range contain inherited 460–450 Ma zircons. |
format |
Article in Journal/Newspaper |
author |
Barnes, Calvin G. Frost, Carol D. Yoshinobu, Aaron S. McArthur, Kelsey Barnes, Melanie A. Allen, Charlotte M. Nordgulen, �ystein Prestvik, Tore |
author_facet |
Barnes, Calvin G. Frost, Carol D. Yoshinobu, Aaron S. McArthur, Kelsey Barnes, Melanie A. Allen, Charlotte M. Nordgulen, �ystein Prestvik, Tore |
author_sort |
Barnes, Calvin G. |
title |
Timing of sedimentation, metamorphism, and plutonism in the Helgeland Nappe Complex, north-central Norwegian Caledonides |
title_short |
Timing of sedimentation, metamorphism, and plutonism in the Helgeland Nappe Complex, north-central Norwegian Caledonides |
title_full |
Timing of sedimentation, metamorphism, and plutonism in the Helgeland Nappe Complex, north-central Norwegian Caledonides |
title_fullStr |
Timing of sedimentation, metamorphism, and plutonism in the Helgeland Nappe Complex, north-central Norwegian Caledonides |
title_full_unstemmed |
Timing of sedimentation, metamorphism, and plutonism in the Helgeland Nappe Complex, north-central Norwegian Caledonides |
title_sort |
timing of sedimentation, metamorphism, and plutonism in the helgeland nappe complex, north-central norwegian caledonides |
publisher |
Geological Society of America |
publishDate |
2007 |
url |
https://eprints.qut.edu.au/117839/ |
long_lat |
ENVELOPE(11.242,11.242,64.864,64.864) ENVELOPE(12.119,12.119,65.474,65.474) ENVELOPE(12.527,12.527,66.136,66.136) |
geographic |
Helgeland Norway Vikna Sauren Skei |
geographic_facet |
Helgeland Norway Vikna Sauren Skei |
genre |
Helgeland Torghatten |
genre_facet |
Helgeland Torghatten |
op_source |
Geosphere |
op_relation |
https://eprints.qut.edu.au/117839/1/117839.pdf doi:10.1130/GES00138.1 Barnes, Calvin G., Frost, Carol D., Yoshinobu, Aaron S., McArthur, Kelsey, Barnes, Melanie A., Allen, Charlotte M., Nordgulen, �ystein, & Prestvik, Tore (2007) Timing of sedimentation, metamorphism, and plutonism in the Helgeland Nappe Complex, north-central Norwegian Caledonides. Geosphere, 3(6), pp. 683-703. https://eprints.qut.edu.au/117839/ Institute for Future Environments; Science & Engineering Faculty; School of Earth, Environmental & Biological Sciences |
op_rights |
free_to_read 2007 Geological Society of America This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au |
op_doi |
https://doi.org/10.1130/GES00138.1 |
container_title |
Geosphere |
container_volume |
3 |
container_issue |
6 |
container_start_page |
683 |
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