The Timing of Strike-Slip Deformation Along the Storstrømmen Shear Zone, Greenland Caledonides: U–Pb Zircon and Titanite Geochronology
The Storstrømmen shear zone (SSZ) in the Greenland Caledonides is widely interpreted to have formed in a transpressional regime during sinistral, oblique collision between Baltica and Laurentia in the Silurian to Devonian. New mapping of the SSZ at Sanddal documents a 100 m thick, greenschistfacies...
Published in: | Geoscience Canada |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Geological Association of Canada
2014
|
Subjects: | |
Online Access: | https://journals.lib.unb.ca/index.php/GC/article/view/20413 |
id |
ftuninewbrunojs:oai:ojs.journals.lib.unb.ca:article/20413 |
---|---|
record_format |
openpolar |
spelling |
ftuninewbrunojs:oai:ojs.journals.lib.unb.ca:article/20413 2023-05-15T16:19:43+02:00 The Timing of Strike-Slip Deformation Along the Storstrømmen Shear Zone, Greenland Caledonides: U–Pb Zircon and Titanite Geochronology Hallett, Benjamin W. McClelland, William C. Gilotti, Jane A. 2014-03-04 application/pdf https://journals.lib.unb.ca/index.php/GC/article/view/20413 eng eng Geological Association of Canada https://journals.lib.unb.ca/index.php/GC/article/view/20413/24864 https://journals.lib.unb.ca/index.php/GC/article/view/20413 Copyright (c) 2015 Geoscience Canada Geoscience Canada; Volume 41, Number 1 (2014); 19-45 1911-4850 0315-0941 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2014 ftuninewbrunojs 2022-07-11T11:48:25Z The Storstrømmen shear zone (SSZ) in the Greenland Caledonides is widely interpreted to have formed in a transpressional regime during sinistral, oblique collision between Baltica and Laurentia in the Silurian to Devonian. New mapping of the SSZ at Sanddal documents a 100 m thick, greenschistfacies mylonite zone cutting the eclogite to amphibolite-facies gneiss complex. We present U–Pb ion probe geochronology on zircon and titanite from a variety of lithologies that shows the SSZ was active from late Devonian to the Carboniferous (at least until 350 Ma). The age of thrusting in the foreland is not well known, but must be younger than the age of eclogite-facies metamorphism at ~400 Ma. It is, therefore, possible that contraction is the same age as strike-slip motion, and that transpression is a viable model. The timing of the SSZ is synchronous with dextral strike-slip displacement on the Germania Land deformation zone. Simultaneous displacement on sinistral and dextral, conjugate shear zones suggests that the SSZ is part of a strikeslip fault system that led to lateral escape of material northward (present day coordinates) during the waning stages of plate convergence between Laurentia and Baltica.SOMMAIRELa zone de cisaillement de Storstrømmen (SSZ) dans les Calédonides du Groenland est généralement comprise comme ayant été formée durant un régime de transpression sénestre lors de la collision oblique entre Baltica et Laurentie, du Silurien au Dévonien. Une nouvelle cartographie de la SSZ à Sanddal décrit une zone de 100 m d’épaisseur de mylonite au faciès des schistes verts qui recoupe un complexe de gneiss au faciès éclogite à amphibolite. Notre analyse géochronologique par sonde ionique U-Pb sur zircon et titanite sur diverses lithologies, montre que la SSZ a été active de la fin du Dévonien jusqu’au Carbonifère (au moins jusqu’à 350 Ma). L’âge du chevauchement dans l’avant-pays n’est pas bien connue, mais il doit être plus jeune que le métamorphisme au faciès d’éclogite à ~400 Ma. Il est donc possible que ... Article in Journal/Newspaper Germania land Greenland Groenland University of New Brunswick: Centre for Digital Scholarship Journals Germania Land ENVELOPE(-20.042,-20.042,77.129,77.129) Greenland Geoscience Canada 41 1 19 |
institution |
Open Polar |
collection |
University of New Brunswick: Centre for Digital Scholarship Journals |
op_collection_id |
ftuninewbrunojs |
language |
English |
description |
The Storstrømmen shear zone (SSZ) in the Greenland Caledonides is widely interpreted to have formed in a transpressional regime during sinistral, oblique collision between Baltica and Laurentia in the Silurian to Devonian. New mapping of the SSZ at Sanddal documents a 100 m thick, greenschistfacies mylonite zone cutting the eclogite to amphibolite-facies gneiss complex. We present U–Pb ion probe geochronology on zircon and titanite from a variety of lithologies that shows the SSZ was active from late Devonian to the Carboniferous (at least until 350 Ma). The age of thrusting in the foreland is not well known, but must be younger than the age of eclogite-facies metamorphism at ~400 Ma. It is, therefore, possible that contraction is the same age as strike-slip motion, and that transpression is a viable model. The timing of the SSZ is synchronous with dextral strike-slip displacement on the Germania Land deformation zone. Simultaneous displacement on sinistral and dextral, conjugate shear zones suggests that the SSZ is part of a strikeslip fault system that led to lateral escape of material northward (present day coordinates) during the waning stages of plate convergence between Laurentia and Baltica.SOMMAIRELa zone de cisaillement de Storstrømmen (SSZ) dans les Calédonides du Groenland est généralement comprise comme ayant été formée durant un régime de transpression sénestre lors de la collision oblique entre Baltica et Laurentie, du Silurien au Dévonien. Une nouvelle cartographie de la SSZ à Sanddal décrit une zone de 100 m d’épaisseur de mylonite au faciès des schistes verts qui recoupe un complexe de gneiss au faciès éclogite à amphibolite. Notre analyse géochronologique par sonde ionique U-Pb sur zircon et titanite sur diverses lithologies, montre que la SSZ a été active de la fin du Dévonien jusqu’au Carbonifère (au moins jusqu’à 350 Ma). L’âge du chevauchement dans l’avant-pays n’est pas bien connue, mais il doit être plus jeune que le métamorphisme au faciès d’éclogite à ~400 Ma. Il est donc possible que ... |
format |
Article in Journal/Newspaper |
author |
Hallett, Benjamin W. McClelland, William C. Gilotti, Jane A. |
spellingShingle |
Hallett, Benjamin W. McClelland, William C. Gilotti, Jane A. The Timing of Strike-Slip Deformation Along the Storstrømmen Shear Zone, Greenland Caledonides: U–Pb Zircon and Titanite Geochronology |
author_facet |
Hallett, Benjamin W. McClelland, William C. Gilotti, Jane A. |
author_sort |
Hallett, Benjamin W. |
title |
The Timing of Strike-Slip Deformation Along the Storstrømmen Shear Zone, Greenland Caledonides: U–Pb Zircon and Titanite Geochronology |
title_short |
The Timing of Strike-Slip Deformation Along the Storstrømmen Shear Zone, Greenland Caledonides: U–Pb Zircon and Titanite Geochronology |
title_full |
The Timing of Strike-Slip Deformation Along the Storstrømmen Shear Zone, Greenland Caledonides: U–Pb Zircon and Titanite Geochronology |
title_fullStr |
The Timing of Strike-Slip Deformation Along the Storstrømmen Shear Zone, Greenland Caledonides: U–Pb Zircon and Titanite Geochronology |
title_full_unstemmed |
The Timing of Strike-Slip Deformation Along the Storstrømmen Shear Zone, Greenland Caledonides: U–Pb Zircon and Titanite Geochronology |
title_sort |
timing of strike-slip deformation along the storstrømmen shear zone, greenland caledonides: u–pb zircon and titanite geochronology |
publisher |
Geological Association of Canada |
publishDate |
2014 |
url |
https://journals.lib.unb.ca/index.php/GC/article/view/20413 |
long_lat |
ENVELOPE(-20.042,-20.042,77.129,77.129) |
geographic |
Germania Land Greenland |
geographic_facet |
Germania Land Greenland |
genre |
Germania land Greenland Groenland |
genre_facet |
Germania land Greenland Groenland |
op_source |
Geoscience Canada; Volume 41, Number 1 (2014); 19-45 1911-4850 0315-0941 |
op_relation |
https://journals.lib.unb.ca/index.php/GC/article/view/20413/24864 https://journals.lib.unb.ca/index.php/GC/article/view/20413 |
op_rights |
Copyright (c) 2015 Geoscience Canada |
container_title |
Geoscience Canada |
container_volume |
41 |
container_issue |
1 |
container_start_page |
19 |
_version_ |
1766006123672895488 |