U-Pb ages of syndeformational dykes associated with the Mesoproterozoic Nain Plutonic Suite, Labrador
Field and U-Pb zircon geochronological studies in a suite of crosscutting, deformed, and metamorphosed basic dykes show that they were emplaced in a syndeformational environment between 1328 ± 2 and 1316.5 ± 1.6 Ma. Earlier dykes in the suite are granulitic, commonly folded along north-south axes or...
Published in: | Canadian Journal of Earth Sciences |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1999
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/e98-101 http://www.nrcresearchpress.com/doi/pdf/10.1139/e98-101 |
id |
crcansciencepubl:10.1139/e98-101 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/e98-101 2023-12-17T10:33:32+01:00 U-Pb ages of syndeformational dykes associated with the Mesoproterozoic Nain Plutonic Suite, Labrador Cadman, Andrew C Noble, Steve R Tarney, John Park, R Graham Ryan, A Bruce Royse, Kate R 1999 http://dx.doi.org/10.1139/e98-101 http://www.nrcresearchpress.com/doi/pdf/10.1139/e98-101 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 36, issue 3, page 339-348 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1999 crcansciencepubl https://doi.org/10.1139/e98-101 2023-11-19T13:39:08Z Field and U-Pb zircon geochronological studies in a suite of crosscutting, deformed, and metamorphosed basic dykes show that they were emplaced in a syndeformational environment between 1328 ± 2 and 1316.5 ± 1.6 Ma. Earlier dykes in the suite are granulitic, commonly folded along north-south axes or strongly rotated into north-south-trending shear zones. Later dykes are metamorphosed to amphibolite grade. These sometimes retain igneous porphyritic textures and occasionally crosscut the granulite dykes. The amphibolite dykes were emplaced in a less ductile crustal environment and a structural environment less dominated by shear deformation. Both granulitic and to a lesser extent amphibolite dykes show evidence of synshear emplacement. The episode of emplacement is broadly coeval with the injection of the mid-Proterozoic Nain Plutonic Suite (NPS) and suggests that the dykes were injected as a series of leaks from NPS feeder chambers. If so, the granulite dykes may represent leaks intruded near the culmination of NPS activity, whereas the amphibolite dykes were probably injected during the waning phase of tectono-thermal conditions. Article in Journal/Newspaper Nain Canadian Science Publishing (via Crossref) Nain ENVELOPE(-61.695,-61.695,56.542,56.542) Canadian Journal of Earth Sciences 36 3 339 348 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Cadman, Andrew C Noble, Steve R Tarney, John Park, R Graham Ryan, A Bruce Royse, Kate R U-Pb ages of syndeformational dykes associated with the Mesoproterozoic Nain Plutonic Suite, Labrador |
topic_facet |
General Earth and Planetary Sciences |
description |
Field and U-Pb zircon geochronological studies in a suite of crosscutting, deformed, and metamorphosed basic dykes show that they were emplaced in a syndeformational environment between 1328 ± 2 and 1316.5 ± 1.6 Ma. Earlier dykes in the suite are granulitic, commonly folded along north-south axes or strongly rotated into north-south-trending shear zones. Later dykes are metamorphosed to amphibolite grade. These sometimes retain igneous porphyritic textures and occasionally crosscut the granulite dykes. The amphibolite dykes were emplaced in a less ductile crustal environment and a structural environment less dominated by shear deformation. Both granulitic and to a lesser extent amphibolite dykes show evidence of synshear emplacement. The episode of emplacement is broadly coeval with the injection of the mid-Proterozoic Nain Plutonic Suite (NPS) and suggests that the dykes were injected as a series of leaks from NPS feeder chambers. If so, the granulite dykes may represent leaks intruded near the culmination of NPS activity, whereas the amphibolite dykes were probably injected during the waning phase of tectono-thermal conditions. |
format |
Article in Journal/Newspaper |
author |
Cadman, Andrew C Noble, Steve R Tarney, John Park, R Graham Ryan, A Bruce Royse, Kate R |
author_facet |
Cadman, Andrew C Noble, Steve R Tarney, John Park, R Graham Ryan, A Bruce Royse, Kate R |
author_sort |
Cadman, Andrew C |
title |
U-Pb ages of syndeformational dykes associated with the Mesoproterozoic Nain Plutonic Suite, Labrador |
title_short |
U-Pb ages of syndeformational dykes associated with the Mesoproterozoic Nain Plutonic Suite, Labrador |
title_full |
U-Pb ages of syndeformational dykes associated with the Mesoproterozoic Nain Plutonic Suite, Labrador |
title_fullStr |
U-Pb ages of syndeformational dykes associated with the Mesoproterozoic Nain Plutonic Suite, Labrador |
title_full_unstemmed |
U-Pb ages of syndeformational dykes associated with the Mesoproterozoic Nain Plutonic Suite, Labrador |
title_sort |
u-pb ages of syndeformational dykes associated with the mesoproterozoic nain plutonic suite, labrador |
publisher |
Canadian Science Publishing |
publishDate |
1999 |
url |
http://dx.doi.org/10.1139/e98-101 http://www.nrcresearchpress.com/doi/pdf/10.1139/e98-101 |
long_lat |
ENVELOPE(-61.695,-61.695,56.542,56.542) |
geographic |
Nain |
geographic_facet |
Nain |
genre |
Nain |
genre_facet |
Nain |
op_source |
Canadian Journal of Earth Sciences volume 36, issue 3, page 339-348 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e98-101 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
36 |
container_issue |
3 |
container_start_page |
339 |
op_container_end_page |
348 |
_version_ |
1785587632337584128 |