Permian alkaline basalts associated with formation of the Sverdrup Basin, Canadian Arctic
Permian basaltic rocks of the Esayoo Formation attended lithospheric extension that formed the Sverdrup Basin in the Canadian Arctic. North of Greely Fiord, northern Ellesmere Island, subaerial flows of the Esayoo Formation attain a maximum thickness of 300 m, but thin rapidly westward, where pillow...
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crcansciencepubl:10.1139/e96-110 2023-12-17T10:25:29+01:00 Permian alkaline basalts associated with formation of the Sverdrup Basin, Canadian Arctic Cameron, B. I. Muecke, G. K. 1996 http://dx.doi.org/10.1139/e96-110 http://www.nrcresearchpress.com/doi/pdf/10.1139/e96-110 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 33, issue 10, page 1462-1473 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1996 crcansciencepubl https://doi.org/10.1139/e96-110 2023-11-19T13:38:43Z Permian basaltic rocks of the Esayoo Formation attended lithospheric extension that formed the Sverdrup Basin in the Canadian Arctic. North of Greely Fiord, northern Ellesmere Island, subaerial flows of the Esayoo Formation attain a maximum thickness of 300 m, but thin rapidly westward, where pillow lavas, epiclastic basalt conglomerate, and associated marine sedimentary rocks indicate proximity to an ancient shoreline. Element-mobility studies demonstrate that modifications of many major elements and some of the large ion lithophile elements accompanied low-grade burial metamorphism. Discriminant diagrams involving only the relatively immobile trace elements reveal within-plate alkaline to transitional basalt affinities. Trace element data (mean Th/Ta = 1.7) do not register significant lower crustal contamination. Models utilizing rare earth clement ratios and Ni–Cr relations suggest that variable degrees of partial melting of an enriched garnet lherzolite and minor combined olivine–clinopyroxene fractional crystallization can account for the described compositional diversity. Nb–Ta peaks (mean La/Nb = 0.99) in spider diagrams identical to ocean-island basalts characterize magmas derived from the asthenospheric mantle with minimal subcontinental lithospheric contribution and continental contamination. Small rates of continental extension during the Carboniferous generated small-volume alkaline melts that passed unadulterated through the subcontinental lithosphere and crust during ascent from their asthenospheric mantle source. Article in Journal/Newspaper Arctic Ellesmere Island Greely Fiord sverdrup basin Ocean Island Canadian Science Publishing (via Crossref) Arctic Ellesmere Island Greely Fiord ENVELOPE(-81.665,-81.665,80.502,80.502) Canadian Journal of Earth Sciences 33 10 1462 1473 |
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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 Cameron, B. I. Muecke, G. K. Permian alkaline basalts associated with formation of the Sverdrup Basin, Canadian Arctic |
topic_facet |
General Earth and Planetary Sciences |
description |
Permian basaltic rocks of the Esayoo Formation attended lithospheric extension that formed the Sverdrup Basin in the Canadian Arctic. North of Greely Fiord, northern Ellesmere Island, subaerial flows of the Esayoo Formation attain a maximum thickness of 300 m, but thin rapidly westward, where pillow lavas, epiclastic basalt conglomerate, and associated marine sedimentary rocks indicate proximity to an ancient shoreline. Element-mobility studies demonstrate that modifications of many major elements and some of the large ion lithophile elements accompanied low-grade burial metamorphism. Discriminant diagrams involving only the relatively immobile trace elements reveal within-plate alkaline to transitional basalt affinities. Trace element data (mean Th/Ta = 1.7) do not register significant lower crustal contamination. Models utilizing rare earth clement ratios and Ni–Cr relations suggest that variable degrees of partial melting of an enriched garnet lherzolite and minor combined olivine–clinopyroxene fractional crystallization can account for the described compositional diversity. Nb–Ta peaks (mean La/Nb = 0.99) in spider diagrams identical to ocean-island basalts characterize magmas derived from the asthenospheric mantle with minimal subcontinental lithospheric contribution and continental contamination. Small rates of continental extension during the Carboniferous generated small-volume alkaline melts that passed unadulterated through the subcontinental lithosphere and crust during ascent from their asthenospheric mantle source. |
format |
Article in Journal/Newspaper |
author |
Cameron, B. I. Muecke, G. K. |
author_facet |
Cameron, B. I. Muecke, G. K. |
author_sort |
Cameron, B. I. |
title |
Permian alkaline basalts associated with formation of the Sverdrup Basin, Canadian Arctic |
title_short |
Permian alkaline basalts associated with formation of the Sverdrup Basin, Canadian Arctic |
title_full |
Permian alkaline basalts associated with formation of the Sverdrup Basin, Canadian Arctic |
title_fullStr |
Permian alkaline basalts associated with formation of the Sverdrup Basin, Canadian Arctic |
title_full_unstemmed |
Permian alkaline basalts associated with formation of the Sverdrup Basin, Canadian Arctic |
title_sort |
permian alkaline basalts associated with formation of the sverdrup basin, canadian arctic |
publisher |
Canadian Science Publishing |
publishDate |
1996 |
url |
http://dx.doi.org/10.1139/e96-110 http://www.nrcresearchpress.com/doi/pdf/10.1139/e96-110 |
long_lat |
ENVELOPE(-81.665,-81.665,80.502,80.502) |
geographic |
Arctic Ellesmere Island Greely Fiord |
geographic_facet |
Arctic Ellesmere Island Greely Fiord |
genre |
Arctic Ellesmere Island Greely Fiord sverdrup basin Ocean Island |
genre_facet |
Arctic Ellesmere Island Greely Fiord sverdrup basin Ocean Island |
op_source |
Canadian Journal of Earth Sciences volume 33, issue 10, page 1462-1473 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e96-110 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
33 |
container_issue |
10 |
container_start_page |
1462 |
op_container_end_page |
1473 |
_version_ |
1785577123650469888 |