Neoarchean decoupling of upper- and mid-crustal tectonothermal domains in the southeast Slave Province: evidence from the Walmsley Lake area
The Walmsley Lake area of the southeastern Slave Province, Northwest Territories, exposes a crustal transect from greenschist through to upper amphibolite facies. Two tectonothermal crustal domains are proposed based on disparate tectonic histories and rock types. Within the upper tectonothermal dom...
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crcansciencepubl:10.1139/e05-057 2023-12-17T10:47:42+01:00 Neoarchean decoupling of upper- and mid-crustal tectonothermal domains in the southeast Slave Province: evidence from the Walmsley Lake area Cairns, S Relf, C MacLachlan, K Davis, W J 2005 http://dx.doi.org/10.1139/e05-057 http://www.nrcresearchpress.com/doi/pdf/10.1139/e05-057 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 42, issue 6, page 869-894 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2005 crcansciencepubl https://doi.org/10.1139/e05-057 2023-11-19T13:39:09Z The Walmsley Lake area of the southeastern Slave Province, Northwest Territories, exposes a crustal transect from greenschist through to upper amphibolite facies. Two tectonothermal crustal domains are proposed based on disparate tectonic histories and rock types. Within the upper tectonothermal domain, D 1 deformation reached lower amphibolite facies prior to 2614 Ma and associated M 1 metamorphic conditions outlasted D 1 . Peak M 2 conditions reached middle amphibolite facies prior to 2603 Ma and outlasted D 2 deformation. Deformation style and metamorphic sequencing during these two pre-2600 Ma events are consistent with regional crustal shortening and thickening in the upper tectonothermal domain. At mid-crustal levels in the lower tectonothermal domain, a third tectonothermal event (D 3 M 3 ) produced uppermost amphibolite-facies peak metamorphic conditions, transposed preexisting fabrics to shallow dips, and produced a subhorizontal foliation and recumbent folds at ca. 2583 Ma. D 3 structures are not present in the upper tectono thermal domain, however, evidence of M 3 heating is locally displayed in rocks at the base of the upper tectonothermal domain. Upper and lower domains were structurally decoupled during the D 3 M 3 event. In rare places where the zone between the two domains outcrops, it comprises a narrow high-strain zone. The metamorphic and structural topology of the Walmsley Lake area is consistent with the topology predicted from thermomechanical modeling and modern observations of gravitational accommodation in structurally thickened crust. Article in Journal/Newspaper Northwest Territories Canadian Science Publishing (via Crossref) Northwest Territories Canadian Journal of Earth Sciences 42 6 869 894 |
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 Cairns, S Relf, C MacLachlan, K Davis, W J Neoarchean decoupling of upper- and mid-crustal tectonothermal domains in the southeast Slave Province: evidence from the Walmsley Lake area |
topic_facet |
General Earth and Planetary Sciences |
description |
The Walmsley Lake area of the southeastern Slave Province, Northwest Territories, exposes a crustal transect from greenschist through to upper amphibolite facies. Two tectonothermal crustal domains are proposed based on disparate tectonic histories and rock types. Within the upper tectonothermal domain, D 1 deformation reached lower amphibolite facies prior to 2614 Ma and associated M 1 metamorphic conditions outlasted D 1 . Peak M 2 conditions reached middle amphibolite facies prior to 2603 Ma and outlasted D 2 deformation. Deformation style and metamorphic sequencing during these two pre-2600 Ma events are consistent with regional crustal shortening and thickening in the upper tectonothermal domain. At mid-crustal levels in the lower tectonothermal domain, a third tectonothermal event (D 3 M 3 ) produced uppermost amphibolite-facies peak metamorphic conditions, transposed preexisting fabrics to shallow dips, and produced a subhorizontal foliation and recumbent folds at ca. 2583 Ma. D 3 structures are not present in the upper tectono thermal domain, however, evidence of M 3 heating is locally displayed in rocks at the base of the upper tectonothermal domain. Upper and lower domains were structurally decoupled during the D 3 M 3 event. In rare places where the zone between the two domains outcrops, it comprises a narrow high-strain zone. The metamorphic and structural topology of the Walmsley Lake area is consistent with the topology predicted from thermomechanical modeling and modern observations of gravitational accommodation in structurally thickened crust. |
format |
Article in Journal/Newspaper |
author |
Cairns, S Relf, C MacLachlan, K Davis, W J |
author_facet |
Cairns, S Relf, C MacLachlan, K Davis, W J |
author_sort |
Cairns, S |
title |
Neoarchean decoupling of upper- and mid-crustal tectonothermal domains in the southeast Slave Province: evidence from the Walmsley Lake area |
title_short |
Neoarchean decoupling of upper- and mid-crustal tectonothermal domains in the southeast Slave Province: evidence from the Walmsley Lake area |
title_full |
Neoarchean decoupling of upper- and mid-crustal tectonothermal domains in the southeast Slave Province: evidence from the Walmsley Lake area |
title_fullStr |
Neoarchean decoupling of upper- and mid-crustal tectonothermal domains in the southeast Slave Province: evidence from the Walmsley Lake area |
title_full_unstemmed |
Neoarchean decoupling of upper- and mid-crustal tectonothermal domains in the southeast Slave Province: evidence from the Walmsley Lake area |
title_sort |
neoarchean decoupling of upper- and mid-crustal tectonothermal domains in the southeast slave province: evidence from the walmsley lake area |
publisher |
Canadian Science Publishing |
publishDate |
2005 |
url |
http://dx.doi.org/10.1139/e05-057 http://www.nrcresearchpress.com/doi/pdf/10.1139/e05-057 |
geographic |
Northwest Territories |
geographic_facet |
Northwest Territories |
genre |
Northwest Territories |
genre_facet |
Northwest Territories |
op_source |
Canadian Journal of Earth Sciences volume 42, issue 6, page 869-894 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e05-057 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
42 |
container_issue |
6 |
container_start_page |
869 |
op_container_end_page |
894 |
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1785571637739913216 |