Paleoproterozoic reworking of an Archean thrust fault in the Hearne domain, Western Churchill Province: UPb geochronological constraints
The nature, timing and control of Archean crustal architecture on the distribution of Proterozoic reworking in Western Churchill Province are investigated in the Yathkyed Lake area, central Nunavut. The Tyrrell shear zone (TSZ) marks the boundary between the northwestern and central Hearne subdomain...
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crcansciencepubl:10.1139/e05-036 2023-12-17T10:47:44+01:00 Paleoproterozoic reworking of an Archean thrust fault in the Hearne domain, Western Churchill Province: UPb geochronological constraints MacLachlan, K Davis, W J Relf, C 2005 http://dx.doi.org/10.1139/e05-036 http://www.nrcresearchpress.com/doi/pdf/10.1139/e05-036 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 42, issue 7, page 1313-1330 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2005 crcansciencepubl https://doi.org/10.1139/e05-036 2023-11-19T13:38:50Z The nature, timing and control of Archean crustal architecture on the distribution of Proterozoic reworking in Western Churchill Province are investigated in the Yathkyed Lake area, central Nunavut. The Tyrrell shear zone (TSZ) marks the boundary between the northwestern and central Hearne subdomains, respectively, in the hanging wall and footwall. Metamorphism and deformation in the hanging wall are ca. 2.662.50 Ga. Two episodes of metamorphism are recorded in a foliated granodiorite in the footwall, at 1818 +5 2 and 1827 ± 5.6 Ma. The latter age is interpreted as the time of amphibolite-facies metamorphism and deformation in the footwall. A crosscutting dyke provides a minimum age of 1818 ± 2 Ma for this metamorphism and deformation. The TSZ is dominated by dextral oblique-slip shear fabrics. A suite of leucogranite dykes provide a maximum age of 1816 ± 2 Ma for dextral shearing. Dextral deformation is bracketed between 1815 ± 2 and 1811 ± 1 Ma, the ages of two other granitoid dykes. In an area of low dextral strain, there are proto-sheath folds related to Neoarchean thrusting. Paleoproterozoic transtensional shearing in the TSZ was localized along a preexisting late Archean thrust fault. The prior existence of this structure resulted in localization of penetrative Paleoproterozoic deformation in its footwall. This domain of high-grade Proterozoic deformation was uplifted in a regional, antiformal, metamorphic culmination, in part, by dextral-normal shearing along the TSZ. Penetrative basement deformation at depth played a role in transmitting farfield stresses related to the Trans-Hudson Orogen into its hinterland. Article in Journal/Newspaper Nunavut Canadian Science Publishing (via Crossref) Nunavut Hudson Tyrrell ENVELOPE(-69.512,-69.512,-69.634,-69.634) Yathkyed Lake ENVELOPE(-97.967,-97.967,62.667,62.667) Canadian Journal of Earth Sciences 42 7 1313 1330 |
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 MacLachlan, K Davis, W J Relf, C Paleoproterozoic reworking of an Archean thrust fault in the Hearne domain, Western Churchill Province: UPb geochronological constraints |
topic_facet |
General Earth and Planetary Sciences |
description |
The nature, timing and control of Archean crustal architecture on the distribution of Proterozoic reworking in Western Churchill Province are investigated in the Yathkyed Lake area, central Nunavut. The Tyrrell shear zone (TSZ) marks the boundary between the northwestern and central Hearne subdomains, respectively, in the hanging wall and footwall. Metamorphism and deformation in the hanging wall are ca. 2.662.50 Ga. Two episodes of metamorphism are recorded in a foliated granodiorite in the footwall, at 1818 +5 2 and 1827 ± 5.6 Ma. The latter age is interpreted as the time of amphibolite-facies metamorphism and deformation in the footwall. A crosscutting dyke provides a minimum age of 1818 ± 2 Ma for this metamorphism and deformation. The TSZ is dominated by dextral oblique-slip shear fabrics. A suite of leucogranite dykes provide a maximum age of 1816 ± 2 Ma for dextral shearing. Dextral deformation is bracketed between 1815 ± 2 and 1811 ± 1 Ma, the ages of two other granitoid dykes. In an area of low dextral strain, there are proto-sheath folds related to Neoarchean thrusting. Paleoproterozoic transtensional shearing in the TSZ was localized along a preexisting late Archean thrust fault. The prior existence of this structure resulted in localization of penetrative Paleoproterozoic deformation in its footwall. This domain of high-grade Proterozoic deformation was uplifted in a regional, antiformal, metamorphic culmination, in part, by dextral-normal shearing along the TSZ. Penetrative basement deformation at depth played a role in transmitting farfield stresses related to the Trans-Hudson Orogen into its hinterland. |
format |
Article in Journal/Newspaper |
author |
MacLachlan, K Davis, W J Relf, C |
author_facet |
MacLachlan, K Davis, W J Relf, C |
author_sort |
MacLachlan, K |
title |
Paleoproterozoic reworking of an Archean thrust fault in the Hearne domain, Western Churchill Province: UPb geochronological constraints |
title_short |
Paleoproterozoic reworking of an Archean thrust fault in the Hearne domain, Western Churchill Province: UPb geochronological constraints |
title_full |
Paleoproterozoic reworking of an Archean thrust fault in the Hearne domain, Western Churchill Province: UPb geochronological constraints |
title_fullStr |
Paleoproterozoic reworking of an Archean thrust fault in the Hearne domain, Western Churchill Province: UPb geochronological constraints |
title_full_unstemmed |
Paleoproterozoic reworking of an Archean thrust fault in the Hearne domain, Western Churchill Province: UPb geochronological constraints |
title_sort |
paleoproterozoic reworking of an archean thrust fault in the hearne domain, western churchill province: upb geochronological constraints |
publisher |
Canadian Science Publishing |
publishDate |
2005 |
url |
http://dx.doi.org/10.1139/e05-036 http://www.nrcresearchpress.com/doi/pdf/10.1139/e05-036 |
long_lat |
ENVELOPE(-69.512,-69.512,-69.634,-69.634) ENVELOPE(-97.967,-97.967,62.667,62.667) |
geographic |
Nunavut Hudson Tyrrell Yathkyed Lake |
geographic_facet |
Nunavut Hudson Tyrrell Yathkyed Lake |
genre |
Nunavut |
genre_facet |
Nunavut |
op_source |
Canadian Journal of Earth Sciences volume 42, issue 7, page 1313-1330 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e05-036 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
42 |
container_issue |
7 |
container_start_page |
1313 |
op_container_end_page |
1330 |
_version_ |
1785571696605921280 |