The electrical resistivity structure of Archean to Tertiary lithosphere along 3200 km of SNORCLE profiles, northwestern Canada
Magnetotelluric (MT) measurements to image the three-dimensional resistivity structure of the North American continent from an Archean core to a region of Tertiary assembly were recorded at almost 300 sites along 3200 km of profiles on the Lithoprobe Slave Northern Cordillera Lithospheric Evolutio...
Published in: | Canadian Journal of Earth Sciences |
---|---|
Main Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
2005
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/e05-080 http://www.nrcresearchpress.com/doi/pdf/10.1139/e05-080 |
id |
crcansciencepubl:10.1139/e05-080 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/e05-080 2023-12-17T10:30:38+01:00 The electrical resistivity structure of Archean to Tertiary lithosphere along 3200 km of SNORCLE profiles, northwestern Canada Jones, Alan G Ledo, Juanjo Ferguson, Ian J Farquharson, Colin Garcia, Xavier Grant, Nick McNeice, Gary Roberts, Brian Spratt, Jessica Wennberg, Grant Wolynec, Lisa Wu, Xianghong 2005 http://dx.doi.org/10.1139/e05-080 http://www.nrcresearchpress.com/doi/pdf/10.1139/e05-080 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 42, issue 6, page 1257-1275 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2005 crcansciencepubl https://doi.org/10.1139/e05-080 2023-11-19T13:38:49Z Magnetotelluric (MT) measurements to image the three-dimensional resistivity structure of the North American continent from an Archean core to a region of Tertiary assembly were recorded at almost 300 sites along 3200 km of profiles on the Lithoprobe Slave Northern Cordillera Lithospheric Evolution (SNORCLE) transect in northwestern Canada. At the largest scale, the MT results indicate significant lithospheric thickness variation, from 260 km at the southwest margin of the Slave craton to significantly < 100 km at the southwestern end of the SNORCLE transect in the Cordillera. At intermediate scale, the resistivity results allow broad terrane subdivisions to be made. Several anomalously conductive zones along the SNORCLE transect, in rocks ranging in age from Archean to Tertiary, are attributed to the introduction of either water or carbon into the crust and mantle during subduction processes. At the local scale, the MT data image two major faults crossing the study area, the Great Slave Lake shear zone and the Tintina Fault. The resistivity images show that both the Tintina Fault and Great Slave Lake shear zone form crustal-scale features, and that the Tintina Fault has a remarkably uniform resistivity signature over a 400 km strike length in the study area. Arguably the most controversial conclusion reached is that the MT data do not support the western extension of North American autochthonous basement suggested from interpretation of the seismic reflection data. Article in Journal/Newspaper Great Slave Lake Canadian Science Publishing (via Crossref) Canada Great Slave Lake ENVELOPE(-114.001,-114.001,61.500,61.500) Canadian Journal of Earth Sciences 42 6 1257 1275 |
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 Jones, Alan G Ledo, Juanjo Ferguson, Ian J Farquharson, Colin Garcia, Xavier Grant, Nick McNeice, Gary Roberts, Brian Spratt, Jessica Wennberg, Grant Wolynec, Lisa Wu, Xianghong The electrical resistivity structure of Archean to Tertiary lithosphere along 3200 km of SNORCLE profiles, northwestern Canada |
topic_facet |
General Earth and Planetary Sciences |
description |
Magnetotelluric (MT) measurements to image the three-dimensional resistivity structure of the North American continent from an Archean core to a region of Tertiary assembly were recorded at almost 300 sites along 3200 km of profiles on the Lithoprobe Slave Northern Cordillera Lithospheric Evolution (SNORCLE) transect in northwestern Canada. At the largest scale, the MT results indicate significant lithospheric thickness variation, from 260 km at the southwest margin of the Slave craton to significantly < 100 km at the southwestern end of the SNORCLE transect in the Cordillera. At intermediate scale, the resistivity results allow broad terrane subdivisions to be made. Several anomalously conductive zones along the SNORCLE transect, in rocks ranging in age from Archean to Tertiary, are attributed to the introduction of either water or carbon into the crust and mantle during subduction processes. At the local scale, the MT data image two major faults crossing the study area, the Great Slave Lake shear zone and the Tintina Fault. The resistivity images show that both the Tintina Fault and Great Slave Lake shear zone form crustal-scale features, and that the Tintina Fault has a remarkably uniform resistivity signature over a 400 km strike length in the study area. Arguably the most controversial conclusion reached is that the MT data do not support the western extension of North American autochthonous basement suggested from interpretation of the seismic reflection data. |
format |
Article in Journal/Newspaper |
author |
Jones, Alan G Ledo, Juanjo Ferguson, Ian J Farquharson, Colin Garcia, Xavier Grant, Nick McNeice, Gary Roberts, Brian Spratt, Jessica Wennberg, Grant Wolynec, Lisa Wu, Xianghong |
author_facet |
Jones, Alan G Ledo, Juanjo Ferguson, Ian J Farquharson, Colin Garcia, Xavier Grant, Nick McNeice, Gary Roberts, Brian Spratt, Jessica Wennberg, Grant Wolynec, Lisa Wu, Xianghong |
author_sort |
Jones, Alan G |
title |
The electrical resistivity structure of Archean to Tertiary lithosphere along 3200 km of SNORCLE profiles, northwestern Canada |
title_short |
The electrical resistivity structure of Archean to Tertiary lithosphere along 3200 km of SNORCLE profiles, northwestern Canada |
title_full |
The electrical resistivity structure of Archean to Tertiary lithosphere along 3200 km of SNORCLE profiles, northwestern Canada |
title_fullStr |
The electrical resistivity structure of Archean to Tertiary lithosphere along 3200 km of SNORCLE profiles, northwestern Canada |
title_full_unstemmed |
The electrical resistivity structure of Archean to Tertiary lithosphere along 3200 km of SNORCLE profiles, northwestern Canada |
title_sort |
electrical resistivity structure of archean to tertiary lithosphere along 3200 km of snorcle profiles, northwestern canada |
publisher |
Canadian Science Publishing |
publishDate |
2005 |
url |
http://dx.doi.org/10.1139/e05-080 http://www.nrcresearchpress.com/doi/pdf/10.1139/e05-080 |
long_lat |
ENVELOPE(-114.001,-114.001,61.500,61.500) |
geographic |
Canada Great Slave Lake |
geographic_facet |
Canada Great Slave Lake |
genre |
Great Slave Lake |
genre_facet |
Great Slave Lake |
op_source |
Canadian Journal of Earth Sciences volume 42, issue 6, page 1257-1275 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e05-080 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
42 |
container_issue |
6 |
container_start_page |
1257 |
op_container_end_page |
1275 |
_version_ |
1785583631192817664 |