Complex evolution of folds and cleavages in Archean rocks, Yellowknife, N.W.T.
Overturned folds and later cleavages in a metasedimentary terrain with marginal volcanics near Yellowknife form a complex succession in which structures repeatedly trend eastward and northward. Early major east–west folds are overturned away from a southern granodioritic complex and terminate westwa...
Published in: | Canadian Journal of Earth Sciences |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Canadian Science Publishing
1982
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Online Access: | http://dx.doi.org/10.1139/e82-073 http://www.nrcresearchpress.com/doi/pdf/10.1139/e82-073 |
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crcansciencepubl:10.1139/e82-073 2023-12-17T10:51:30+01:00 Complex evolution of folds and cleavages in Archean rocks, Yellowknife, N.W.T. Fyson, W. K. 1982 http://dx.doi.org/10.1139/e82-073 http://www.nrcresearchpress.com/doi/pdf/10.1139/e82-073 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 19, issue 4, page 878-893 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1982 crcansciencepubl https://doi.org/10.1139/e82-073 2023-11-19T13:38:58Z Overturned folds and later cleavages in a metasedimentary terrain with marginal volcanics near Yellowknife form a complex succession in which structures repeatedly trend eastward and northward. Early major east–west folds are overturned away from a southern granodioritic complex and terminate westward against a major syncline, with limbs overturned inward, trending north–south along the western granitoid boundary of the terrain. Later smaller folds (limbs ~1 km), which die out away from granitoid plutons, include a progression from northerly to easterly trending structures. Several sets of cleavage foliations, mostly steeply inclined, transgress the folds: an east–west set, succeeded by a regionally dominant set striking northwest to north, and a later north–south set confined to near the western margin of the terrain.The easterly and northerly, near-orthogonal trends followed by successive structures could reflect the influence of fault-bounded crustal blocks. During emplacement of fault-controlled granitoid bodies, the blocks may have tilted successively about easterly or northerly axes with gravitational collapse, folding, and overturning of the supracrustal rocks. Further tilting could in part have led to the compressions that formed the cleavages. Article in Journal/Newspaper Yellowknife Canadian Science Publishing (via Crossref) Yellowknife Tilting ENVELOPE(-54.065,-54.065,49.700,49.700) Canadian Journal of Earth Sciences 19 4 878 893 |
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 Fyson, W. K. Complex evolution of folds and cleavages in Archean rocks, Yellowknife, N.W.T. |
topic_facet |
General Earth and Planetary Sciences |
description |
Overturned folds and later cleavages in a metasedimentary terrain with marginal volcanics near Yellowknife form a complex succession in which structures repeatedly trend eastward and northward. Early major east–west folds are overturned away from a southern granodioritic complex and terminate westward against a major syncline, with limbs overturned inward, trending north–south along the western granitoid boundary of the terrain. Later smaller folds (limbs ~1 km), which die out away from granitoid plutons, include a progression from northerly to easterly trending structures. Several sets of cleavage foliations, mostly steeply inclined, transgress the folds: an east–west set, succeeded by a regionally dominant set striking northwest to north, and a later north–south set confined to near the western margin of the terrain.The easterly and northerly, near-orthogonal trends followed by successive structures could reflect the influence of fault-bounded crustal blocks. During emplacement of fault-controlled granitoid bodies, the blocks may have tilted successively about easterly or northerly axes with gravitational collapse, folding, and overturning of the supracrustal rocks. Further tilting could in part have led to the compressions that formed the cleavages. |
format |
Article in Journal/Newspaper |
author |
Fyson, W. K. |
author_facet |
Fyson, W. K. |
author_sort |
Fyson, W. K. |
title |
Complex evolution of folds and cleavages in Archean rocks, Yellowknife, N.W.T. |
title_short |
Complex evolution of folds and cleavages in Archean rocks, Yellowknife, N.W.T. |
title_full |
Complex evolution of folds and cleavages in Archean rocks, Yellowknife, N.W.T. |
title_fullStr |
Complex evolution of folds and cleavages in Archean rocks, Yellowknife, N.W.T. |
title_full_unstemmed |
Complex evolution of folds and cleavages in Archean rocks, Yellowknife, N.W.T. |
title_sort |
complex evolution of folds and cleavages in archean rocks, yellowknife, n.w.t. |
publisher |
Canadian Science Publishing |
publishDate |
1982 |
url |
http://dx.doi.org/10.1139/e82-073 http://www.nrcresearchpress.com/doi/pdf/10.1139/e82-073 |
long_lat |
ENVELOPE(-54.065,-54.065,49.700,49.700) |
geographic |
Yellowknife Tilting |
geographic_facet |
Yellowknife Tilting |
genre |
Yellowknife |
genre_facet |
Yellowknife |
op_source |
Canadian Journal of Earth Sciences volume 19, issue 4, page 878-893 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e82-073 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
19 |
container_issue |
4 |
container_start_page |
878 |
op_container_end_page |
893 |
_version_ |
1785576781101662208 |