The Palaeoproterozoic anatomy of the Lewisian Complex, NW Scotland: evidence for two ‘Laxfordian’ tectonothermal cycles
A new structural examination of Palaeoproterozoic high- P granulites on South Harris, NW Scotland, when integrated with previous geochronological, structural and metamorphic studies on key areas of the Lewisian Complex, suggests the existence of two distinct tectonothermal cycles within the Palaeopr...
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Geological Society of London
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ftdatacite:10.6084/m9.figshare.3454064.v1 2023-05-15T16:29:17+02:00 The Palaeoproterozoic anatomy of the Lewisian Complex, NW Scotland: evidence for two ‘Laxfordian’ tectonothermal cycles Mason, Andrew J. 2016 https://dx.doi.org/10.6084/m9.figshare.3454064.v1 https://geolsoc.figshare.com/articles/journal_contribution/The_Palaeoproterozoic_anatomy_of_the_Lewisian_Complex_NW_Scotland_evidence_for_two_Laxfordian_tectonothermal_cycles/3454064/1 unknown Geological Society of London https://dx.doi.org/10.1144/jgs2015-026 https://dx.doi.org/10.6084/m9.figshare.3454064 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geology FOS Earth and related environmental sciences Text article-journal Journal contribution ScholarlyArticle 2016 ftdatacite https://doi.org/10.6084/m9.figshare.3454064.v1 https://doi.org/10.1144/jgs2015-026 https://doi.org/10.6084/m9.figshare.3454064 2021-11-05T12:55:41Z A new structural examination of Palaeoproterozoic high- P granulites on South Harris, NW Scotland, when integrated with previous geochronological, structural and metamorphic studies on key areas of the Lewisian Complex, suggests the existence of two distinct tectonothermal cycles within the Palaeoproterozoic ‘Laxfordian Event’, which on South Harris are separated by a >100 myr hiatus in deformation. The older cycle, from c . 1.91 to 1.85 Ga, records the development of an active continental margin on the Archaean gneisses that dominate the Complex, and the subsequent onset of continent–continent collision; this represents the continuation of the Nagssugtoqidian orogen of Greenland. Evidence for this is concentrated in allochthonous slivers of the former active continental margin displaced during the younger cycle. The younger cycle, around 1.75–1.65 Ga, began with thrust-related crustal thickening that initiated regionally extensive amphibolite-facies metamorphism and ductile deformation, which dominates the preserved ‘Laxfordian’ deformation history. This may be the peripheral expression of the accretion of the Malin block to the SW of the Lewisian, and represents the lateral continuation of the Labradorian–Ketilidian orogen of North America. Text Greenland DataCite Metadata Store (German National Library of Science and Technology) Greenland |
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Open Polar |
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Geology FOS Earth and related environmental sciences |
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Geology FOS Earth and related environmental sciences Mason, Andrew J. The Palaeoproterozoic anatomy of the Lewisian Complex, NW Scotland: evidence for two ‘Laxfordian’ tectonothermal cycles |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
A new structural examination of Palaeoproterozoic high- P granulites on South Harris, NW Scotland, when integrated with previous geochronological, structural and metamorphic studies on key areas of the Lewisian Complex, suggests the existence of two distinct tectonothermal cycles within the Palaeoproterozoic ‘Laxfordian Event’, which on South Harris are separated by a >100 myr hiatus in deformation. The older cycle, from c . 1.91 to 1.85 Ga, records the development of an active continental margin on the Archaean gneisses that dominate the Complex, and the subsequent onset of continent–continent collision; this represents the continuation of the Nagssugtoqidian orogen of Greenland. Evidence for this is concentrated in allochthonous slivers of the former active continental margin displaced during the younger cycle. The younger cycle, around 1.75–1.65 Ga, began with thrust-related crustal thickening that initiated regionally extensive amphibolite-facies metamorphism and ductile deformation, which dominates the preserved ‘Laxfordian’ deformation history. This may be the peripheral expression of the accretion of the Malin block to the SW of the Lewisian, and represents the lateral continuation of the Labradorian–Ketilidian orogen of North America. |
format |
Text |
author |
Mason, Andrew J. |
author_facet |
Mason, Andrew J. |
author_sort |
Mason, Andrew J. |
title |
The Palaeoproterozoic anatomy of the Lewisian Complex, NW Scotland: evidence for two ‘Laxfordian’ tectonothermal cycles |
title_short |
The Palaeoproterozoic anatomy of the Lewisian Complex, NW Scotland: evidence for two ‘Laxfordian’ tectonothermal cycles |
title_full |
The Palaeoproterozoic anatomy of the Lewisian Complex, NW Scotland: evidence for two ‘Laxfordian’ tectonothermal cycles |
title_fullStr |
The Palaeoproterozoic anatomy of the Lewisian Complex, NW Scotland: evidence for two ‘Laxfordian’ tectonothermal cycles |
title_full_unstemmed |
The Palaeoproterozoic anatomy of the Lewisian Complex, NW Scotland: evidence for two ‘Laxfordian’ tectonothermal cycles |
title_sort |
palaeoproterozoic anatomy of the lewisian complex, nw scotland: evidence for two ‘laxfordian’ tectonothermal cycles |
publisher |
Geological Society of London |
publishDate |
2016 |
url |
https://dx.doi.org/10.6084/m9.figshare.3454064.v1 https://geolsoc.figshare.com/articles/journal_contribution/The_Palaeoproterozoic_anatomy_of_the_Lewisian_Complex_NW_Scotland_evidence_for_two_Laxfordian_tectonothermal_cycles/3454064/1 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
https://dx.doi.org/10.1144/jgs2015-026 https://dx.doi.org/10.6084/m9.figshare.3454064 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.3454064.v1 https://doi.org/10.1144/jgs2015-026 https://doi.org/10.6084/m9.figshare.3454064 |
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1766018982017499136 |