Paleomagnetism of the Great Slave Supergroup, Northwest Territories, Canada: multicomponent magnetization of the Kahochella Group
Results are reported from 59 stratigraphic horizons spanning an aggregate of some 2000 m of sedimentary rocks of the Great Slave Supergroup, mostly located in the Kahochella Group. Partial demagnetization experiments and vector differences indicate that the magnetization involved is multicomponent,...
Published in: | Canadian Journal of Earth Sciences |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1981
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/e81-050 http://www.nrcresearchpress.com/doi/pdf/10.1139/e81-050 |
id |
crcansciencepubl:10.1139/e81-050 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/e81-050 2023-12-17T10:47:41+01:00 Paleomagnetism of the Great Slave Supergroup, Northwest Territories, Canada: multicomponent magnetization of the Kahochella Group Reid, A. B. McMurry, E. W. Evans, M. E. 1981 http://dx.doi.org/10.1139/e81-050 http://www.nrcresearchpress.com/doi/pdf/10.1139/e81-050 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 18, issue 3, page 574-583 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1981 crcansciencepubl https://doi.org/10.1139/e81-050 2023-11-19T13:39:14Z Results are reported from 59 stratigraphic horizons spanning an aggregate of some 2000 m of sedimentary rocks of the Great Slave Supergroup, mostly located in the Kahochella Group. Partial demagnetization experiments and vector differences indicate that the magnetization involved is multicomponent, with a well-defined overprint masking an underlying magnetic component. The overprint has now been recognized in many formations of the Great Slave Supergroup and is interpreted as having been acquired in response to uplift and cooling following orogeny in the Coronation Geosyncline. It corresponds to a paleomagnetic pole at 91°W, 21°N (A 95 = 5°). Removal of this overprint reveals the underlying, presumed primary, magnetization, which has a mean direction of D = 129°, I = +21° (N = 18 sites, k = 12, α 95 = 10°) and a corresponding pole at 62°W, 7°S (K = 15, A 95 = 9°). The ages of these poles cannot be fixed precisely, but the available data suggest that the "primary" remanence was acquired about −1.8 Ga, and the overprint about −1.7 Ga. The two poles thus help define the Precambrian polar wander curve for Laurentia. In particular they help define the so-called Coronation loop, which reflects the response of Laurentia to the major orogeny in the Coronation Geosyncline. Article in Journal/Newspaper Northwest Territories Canadian Science Publishing (via Crossref) Northwest Territories Canada Canadian Journal of Earth Sciences 18 3 574 583 |
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 Reid, A. B. McMurry, E. W. Evans, M. E. Paleomagnetism of the Great Slave Supergroup, Northwest Territories, Canada: multicomponent magnetization of the Kahochella Group |
topic_facet |
General Earth and Planetary Sciences |
description |
Results are reported from 59 stratigraphic horizons spanning an aggregate of some 2000 m of sedimentary rocks of the Great Slave Supergroup, mostly located in the Kahochella Group. Partial demagnetization experiments and vector differences indicate that the magnetization involved is multicomponent, with a well-defined overprint masking an underlying magnetic component. The overprint has now been recognized in many formations of the Great Slave Supergroup and is interpreted as having been acquired in response to uplift and cooling following orogeny in the Coronation Geosyncline. It corresponds to a paleomagnetic pole at 91°W, 21°N (A 95 = 5°). Removal of this overprint reveals the underlying, presumed primary, magnetization, which has a mean direction of D = 129°, I = +21° (N = 18 sites, k = 12, α 95 = 10°) and a corresponding pole at 62°W, 7°S (K = 15, A 95 = 9°). The ages of these poles cannot be fixed precisely, but the available data suggest that the "primary" remanence was acquired about −1.8 Ga, and the overprint about −1.7 Ga. The two poles thus help define the Precambrian polar wander curve for Laurentia. In particular they help define the so-called Coronation loop, which reflects the response of Laurentia to the major orogeny in the Coronation Geosyncline. |
format |
Article in Journal/Newspaper |
author |
Reid, A. B. McMurry, E. W. Evans, M. E. |
author_facet |
Reid, A. B. McMurry, E. W. Evans, M. E. |
author_sort |
Reid, A. B. |
title |
Paleomagnetism of the Great Slave Supergroup, Northwest Territories, Canada: multicomponent magnetization of the Kahochella Group |
title_short |
Paleomagnetism of the Great Slave Supergroup, Northwest Territories, Canada: multicomponent magnetization of the Kahochella Group |
title_full |
Paleomagnetism of the Great Slave Supergroup, Northwest Territories, Canada: multicomponent magnetization of the Kahochella Group |
title_fullStr |
Paleomagnetism of the Great Slave Supergroup, Northwest Territories, Canada: multicomponent magnetization of the Kahochella Group |
title_full_unstemmed |
Paleomagnetism of the Great Slave Supergroup, Northwest Territories, Canada: multicomponent magnetization of the Kahochella Group |
title_sort |
paleomagnetism of the great slave supergroup, northwest territories, canada: multicomponent magnetization of the kahochella group |
publisher |
Canadian Science Publishing |
publishDate |
1981 |
url |
http://dx.doi.org/10.1139/e81-050 http://www.nrcresearchpress.com/doi/pdf/10.1139/e81-050 |
geographic |
Northwest Territories Canada |
geographic_facet |
Northwest Territories Canada |
genre |
Northwest Territories |
genre_facet |
Northwest Territories |
op_source |
Canadian Journal of Earth Sciences volume 18, issue 3, page 574-583 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e81-050 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
18 |
container_issue |
3 |
container_start_page |
574 |
op_container_end_page |
583 |
_version_ |
1785571627645272064 |