Geoelectric structure of the Great Slave Lake shear zone in northwest Alberta: implications for structure and tectonic history
The study of ancient plate boundaries can provide insights into the past and present-day tectonic processes. Here, we describe a magnetotelluric (MT) study of the Precambrian basement of the Hay River Fault (HRF) in northwest Alberta, which is the southwest segment of the Great Slave Lake shear zone...
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ftunivtoronto:oai:localhost:1807/82507 2023-05-15T16:23:05+02:00 Geoelectric structure of the Great Slave Lake shear zone in northwest Alberta: implications for structure and tectonic history Wang, Enci Unsworth, Martyn J. Chacko, Thomas 2017-10-05 http://hdl.handle.net/1807/82507 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2017-0067 unknown NRC Research Press (a division of Canadian Science Publishing) 0008-4077 http://hdl.handle.net/1807/82507 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2017-0067 Article 2017 ftunivtoronto 2020-06-17T12:10:41Z The study of ancient plate boundaries can provide insights into the past and present-day tectonic processes. Here, we describe a magnetotelluric (MT) study of the Precambrian basement of the Hay River Fault (HRF) in northwest Alberta, which is the southwest segment of the Great Slave Lake shear zone. New broadband MT data were collected to give a clearer image of the crustal structure. The Western Canada Sedimentary Basin was imaged as a low resistivity layer above the resistive crystalline basement. Four basement conductors were defined, and correlate with the terrane boundaries delineated with aeromagnetic data. These are (1) a major conductor in the Kiskatinaw domain, (2) a conductor on the boundary of the Ksituan and Chinchaga domains, (3) a conductor on the boundary of the Chinchaga and Buffalo Head domains and (4) a conductor near the Hay River Fault. Both (1) and (2) correspond to areas of high seismic reflectivity. The low resistivity can be explained by interconnected grain boundary graphite or sulfide phases deposited by metamorphic fluid migration. The HRF was not definitively located in previous studies. The new data show that the HRF could be thin (1 km) or wide (10 km) and located at the boundary of the contrasting aeromagnetic anomalies or further to the north. Various tectonic processes are proposed to interpret the possible locations of the HRF. No electrical anisotropy structure is required to interpret the MT data in this study. The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author. Article in Journal/Newspaper Great Slave Lake Slave Lake University of Toronto: Research Repository T-Space Buffalo Head ENVELOPE(173.225,173.225,52.908,52.908) Canada Great Slave Lake ENVELOPE(-114.001,-114.001,61.500,61.500) Hay River ENVELOPE(-115.847,-115.847,60.787,60.787) Kiskatinaw ENVELOPE(-120.570,-120.570,55.767,55.767) Ksituan ENVELOPE(-119.019,-119.019,55.900,55.900) |
institution |
Open Polar |
collection |
University of Toronto: Research Repository T-Space |
op_collection_id |
ftunivtoronto |
language |
unknown |
description |
The study of ancient plate boundaries can provide insights into the past and present-day tectonic processes. Here, we describe a magnetotelluric (MT) study of the Precambrian basement of the Hay River Fault (HRF) in northwest Alberta, which is the southwest segment of the Great Slave Lake shear zone. New broadband MT data were collected to give a clearer image of the crustal structure. The Western Canada Sedimentary Basin was imaged as a low resistivity layer above the resistive crystalline basement. Four basement conductors were defined, and correlate with the terrane boundaries delineated with aeromagnetic data. These are (1) a major conductor in the Kiskatinaw domain, (2) a conductor on the boundary of the Ksituan and Chinchaga domains, (3) a conductor on the boundary of the Chinchaga and Buffalo Head domains and (4) a conductor near the Hay River Fault. Both (1) and (2) correspond to areas of high seismic reflectivity. The low resistivity can be explained by interconnected grain boundary graphite or sulfide phases deposited by metamorphic fluid migration. The HRF was not definitively located in previous studies. The new data show that the HRF could be thin (1 km) or wide (10 km) and located at the boundary of the contrasting aeromagnetic anomalies or further to the north. Various tectonic processes are proposed to interpret the possible locations of the HRF. No electrical anisotropy structure is required to interpret the MT data in this study. The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author. |
format |
Article in Journal/Newspaper |
author |
Wang, Enci Unsworth, Martyn J. Chacko, Thomas |
spellingShingle |
Wang, Enci Unsworth, Martyn J. Chacko, Thomas Geoelectric structure of the Great Slave Lake shear zone in northwest Alberta: implications for structure and tectonic history |
author_facet |
Wang, Enci Unsworth, Martyn J. Chacko, Thomas |
author_sort |
Wang, Enci |
title |
Geoelectric structure of the Great Slave Lake shear zone in northwest Alberta: implications for structure and tectonic history |
title_short |
Geoelectric structure of the Great Slave Lake shear zone in northwest Alberta: implications for structure and tectonic history |
title_full |
Geoelectric structure of the Great Slave Lake shear zone in northwest Alberta: implications for structure and tectonic history |
title_fullStr |
Geoelectric structure of the Great Slave Lake shear zone in northwest Alberta: implications for structure and tectonic history |
title_full_unstemmed |
Geoelectric structure of the Great Slave Lake shear zone in northwest Alberta: implications for structure and tectonic history |
title_sort |
geoelectric structure of the great slave lake shear zone in northwest alberta: implications for structure and tectonic history |
publisher |
NRC Research Press (a division of Canadian Science Publishing) |
publishDate |
2017 |
url |
http://hdl.handle.net/1807/82507 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2017-0067 |
long_lat |
ENVELOPE(173.225,173.225,52.908,52.908) ENVELOPE(-114.001,-114.001,61.500,61.500) ENVELOPE(-115.847,-115.847,60.787,60.787) ENVELOPE(-120.570,-120.570,55.767,55.767) ENVELOPE(-119.019,-119.019,55.900,55.900) |
geographic |
Buffalo Head Canada Great Slave Lake Hay River Kiskatinaw Ksituan |
geographic_facet |
Buffalo Head Canada Great Slave Lake Hay River Kiskatinaw Ksituan |
genre |
Great Slave Lake Slave Lake |
genre_facet |
Great Slave Lake Slave Lake |
op_relation |
0008-4077 http://hdl.handle.net/1807/82507 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2017-0067 |
_version_ |
1766011275129651200 |