Geology and geochemistry of an Archean mafic dike complex in the Chan Formation: basis for a revised plate-tectonic model of the Yellowknife greenstone belt
An Archean mafic dike complex in the Chan Formation at the base of the mafic volcanic section of the Yellowknife greenstone belt consists of multiple metagabbro dikes and sills separated by screens of pillowed mafic volcanic rocks, which are cut by a younger postvolcanic metadiabase dike swarm. Fiel...
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Online Access: | http://dx.doi.org/10.1139/e95-052 http://www.nrcresearchpress.com/doi/pdf/10.1139/e95-052 |
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crcansciencepubl:10.1139/e95-052 2023-12-17T10:51:30+01:00 Geology and geochemistry of an Archean mafic dike complex in the Chan Formation: basis for a revised plate-tectonic model of the Yellowknife greenstone belt Maclachlan, Kate Helmstaedt, Herb 1995 http://dx.doi.org/10.1139/e95-052 http://www.nrcresearchpress.com/doi/pdf/10.1139/e95-052 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 32, issue 5, page 614-630 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1995 crcansciencepubl https://doi.org/10.1139/e95-052 2023-11-19T13:39:11Z An Archean mafic dike complex in the Chan Formation at the base of the mafic volcanic section of the Yellowknife greenstone belt consists of multiple metagabbro dikes and sills separated by screens of pillowed mafic volcanic rocks, which are cut by a younger postvolcanic metadiabase dike swarm. Field relationships and geochemical characteristics are compatible with a comagmatic origin for the metagabbro and metavolcanic rocks that were fed through and deposited on an older, rift-related, supracrustal sequence of the Dwyer Group. The synvolcanic metagabbro dikes have extended the strike length of the volcanic section by at least 100%. The mafic rocks of the Chan Formation are geochemically similar to mid-ocean ridge basalt, possibly with a minor subduction-zone component. Preliminary ε Nd values for metagabbroic rocks are consistent with the derivation of magmas predominantly from a normal, depleted-mantle source. The Chan Formation is interpreted to have formed in a marginal basin-like setting, adjacent to a previously rifted and attenuated protocontinental margin. Article in Journal/Newspaper Yellowknife Canadian Science Publishing (via Crossref) Yellowknife Dwyer ENVELOPE(65.050,65.050,-70.183,-70.183) Canadian Journal of Earth Sciences 32 5 614 630 |
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, Kate Helmstaedt, Herb Geology and geochemistry of an Archean mafic dike complex in the Chan Formation: basis for a revised plate-tectonic model of the Yellowknife greenstone belt |
topic_facet |
General Earth and Planetary Sciences |
description |
An Archean mafic dike complex in the Chan Formation at the base of the mafic volcanic section of the Yellowknife greenstone belt consists of multiple metagabbro dikes and sills separated by screens of pillowed mafic volcanic rocks, which are cut by a younger postvolcanic metadiabase dike swarm. Field relationships and geochemical characteristics are compatible with a comagmatic origin for the metagabbro and metavolcanic rocks that were fed through and deposited on an older, rift-related, supracrustal sequence of the Dwyer Group. The synvolcanic metagabbro dikes have extended the strike length of the volcanic section by at least 100%. The mafic rocks of the Chan Formation are geochemically similar to mid-ocean ridge basalt, possibly with a minor subduction-zone component. Preliminary ε Nd values for metagabbroic rocks are consistent with the derivation of magmas predominantly from a normal, depleted-mantle source. The Chan Formation is interpreted to have formed in a marginal basin-like setting, adjacent to a previously rifted and attenuated protocontinental margin. |
format |
Article in Journal/Newspaper |
author |
Maclachlan, Kate Helmstaedt, Herb |
author_facet |
Maclachlan, Kate Helmstaedt, Herb |
author_sort |
Maclachlan, Kate |
title |
Geology and geochemistry of an Archean mafic dike complex in the Chan Formation: basis for a revised plate-tectonic model of the Yellowknife greenstone belt |
title_short |
Geology and geochemistry of an Archean mafic dike complex in the Chan Formation: basis for a revised plate-tectonic model of the Yellowknife greenstone belt |
title_full |
Geology and geochemistry of an Archean mafic dike complex in the Chan Formation: basis for a revised plate-tectonic model of the Yellowknife greenstone belt |
title_fullStr |
Geology and geochemistry of an Archean mafic dike complex in the Chan Formation: basis for a revised plate-tectonic model of the Yellowknife greenstone belt |
title_full_unstemmed |
Geology and geochemistry of an Archean mafic dike complex in the Chan Formation: basis for a revised plate-tectonic model of the Yellowknife greenstone belt |
title_sort |
geology and geochemistry of an archean mafic dike complex in the chan formation: basis for a revised plate-tectonic model of the yellowknife greenstone belt |
publisher |
Canadian Science Publishing |
publishDate |
1995 |
url |
http://dx.doi.org/10.1139/e95-052 http://www.nrcresearchpress.com/doi/pdf/10.1139/e95-052 |
long_lat |
ENVELOPE(65.050,65.050,-70.183,-70.183) |
geographic |
Yellowknife Dwyer |
geographic_facet |
Yellowknife Dwyer |
genre |
Yellowknife |
genre_facet |
Yellowknife |
op_source |
Canadian Journal of Earth Sciences volume 32, issue 5, page 614-630 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e95-052 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
32 |
container_issue |
5 |
container_start_page |
614 |
op_container_end_page |
630 |
_version_ |
1785576776104148992 |