Age and Geochemistry of High Arctic Large Igneous Province Tholeiitic Magmatism in NW Axel Heiberg Island, Canada
Abstract The Cretaceous High Arctic Large Igneous Province (HALIP) in Canada involved extrusion of continental flood basalts (CFBs) at 130–120 Ma and 100‐95 Ma and emplacement of an extensive sill and dike network that intersected the Carboniferous to Paleogene Sverdrup Basin. In this paper, we pres...
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ftdoajarticles:oai:doaj.org/article:685a6ef0bab8474195170217ed84eeb7 2024-01-07T09:41:17+01:00 Age and Geochemistry of High Arctic Large Igneous Province Tholeiitic Magmatism in NW Axel Heiberg Island, Canada F. M. Deegan V. Pease I. G. Nobre Silva J. H. Bédard G. Morris 2023-11-01T00:00:00Z https://doi.org/10.1029/2023GC011083 https://doaj.org/article/685a6ef0bab8474195170217ed84eeb7 EN eng Wiley https://doi.org/10.1029/2023GC011083 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2023GC011083 https://doaj.org/article/685a6ef0bab8474195170217ed84eeb7 Geochemistry, Geophysics, Geosystems, Vol 24, Iss 11, Pp n/a-n/a (2023) HALIP large igneous province geochemistry isotopes mantle crustal assimilation Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 article 2023 ftdoajarticles https://doi.org/10.1029/2023GC011083 2023-12-10T01:41:22Z Abstract The Cretaceous High Arctic Large Igneous Province (HALIP) in Canada involved extrusion of continental flood basalts (CFBs) at 130–120 Ma and 100‐95 Ma and emplacement of an extensive sill and dike network that intersected the Carboniferous to Paleogene Sverdrup Basin. In this paper, we present new 40Ar/39Ar ages, major and trace elements, and Sr‐Nd‐Pb isotope ratios for HALIP lava, dikes, and sills from Bukken Fiord, NW Axel Heiberg Island, Canadian Arctic Islands. Our best constrained 40Ar/39Ar ages yield a weighted average of 124.1 ± 1 (2σ) Ma, coincident with the first pulse of tholeiitic CFB magmatism in the Arctic‐wide HALIP as exemplified by Isachsen Formation flood basalts on Axel Heiberg Island. The Bukken Fiord samples are plagioclase and clinopyroxene‐phyric tholeiitic basalts, are relatively evolved (3.2–6.5 wt% MgO), and share similar major and trace element compositions to typical HALIP tholeiites. Initial 143Nd/144Nd ranges from 0.51260 to 0.51291 and initial 87Sr/86Sr ranges from 0.70362 to 0.70776, while measured 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb range from 18.614 to 19.199, 15.534 to 15.630, and 38.404 to 39.054, respectively. The most primitive sample in this study has Sr‐Nd‐Pb isotope signatures that suggest an enriched plume‐derived mantle source for HALIP tholeiites. Most samples, however, possess relatively radiogenic isotope signatures that can be explained by moderate degrees of assimilation of Sverdrup Basin sedimentary rocks. Magma‐crust interaction in the HALIP plumbing system was likely widespread and may have increased the environmental impact of the HALIP, particularly if crustal carbon was volatilized. Article in Journal/Newspaper Arctic Axel Heiberg Island sverdrup basin Directory of Open Access Journals: DOAJ Articles Arctic Axel Heiberg Island ENVELOPE(-91.001,-91.001,79.752,79.752) Bukken Fiord ENVELOPE(-94.919,-94.919,80.719,80.719) Canada Heiberg ENVELOPE(13.964,13.964,66.424,66.424) Isachsen ENVELOPE(-103.505,-103.505,78.785,78.785) Geochemistry, Geophysics, Geosystems 24 11 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
HALIP large igneous province geochemistry isotopes mantle crustal assimilation Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
spellingShingle |
HALIP large igneous province geochemistry isotopes mantle crustal assimilation Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 F. M. Deegan V. Pease I. G. Nobre Silva J. H. Bédard G. Morris Age and Geochemistry of High Arctic Large Igneous Province Tholeiitic Magmatism in NW Axel Heiberg Island, Canada |
topic_facet |
HALIP large igneous province geochemistry isotopes mantle crustal assimilation Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
description |
Abstract The Cretaceous High Arctic Large Igneous Province (HALIP) in Canada involved extrusion of continental flood basalts (CFBs) at 130–120 Ma and 100‐95 Ma and emplacement of an extensive sill and dike network that intersected the Carboniferous to Paleogene Sverdrup Basin. In this paper, we present new 40Ar/39Ar ages, major and trace elements, and Sr‐Nd‐Pb isotope ratios for HALIP lava, dikes, and sills from Bukken Fiord, NW Axel Heiberg Island, Canadian Arctic Islands. Our best constrained 40Ar/39Ar ages yield a weighted average of 124.1 ± 1 (2σ) Ma, coincident with the first pulse of tholeiitic CFB magmatism in the Arctic‐wide HALIP as exemplified by Isachsen Formation flood basalts on Axel Heiberg Island. The Bukken Fiord samples are plagioclase and clinopyroxene‐phyric tholeiitic basalts, are relatively evolved (3.2–6.5 wt% MgO), and share similar major and trace element compositions to typical HALIP tholeiites. Initial 143Nd/144Nd ranges from 0.51260 to 0.51291 and initial 87Sr/86Sr ranges from 0.70362 to 0.70776, while measured 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb range from 18.614 to 19.199, 15.534 to 15.630, and 38.404 to 39.054, respectively. The most primitive sample in this study has Sr‐Nd‐Pb isotope signatures that suggest an enriched plume‐derived mantle source for HALIP tholeiites. Most samples, however, possess relatively radiogenic isotope signatures that can be explained by moderate degrees of assimilation of Sverdrup Basin sedimentary rocks. Magma‐crust interaction in the HALIP plumbing system was likely widespread and may have increased the environmental impact of the HALIP, particularly if crustal carbon was volatilized. |
format |
Article in Journal/Newspaper |
author |
F. M. Deegan V. Pease I. G. Nobre Silva J. H. Bédard G. Morris |
author_facet |
F. M. Deegan V. Pease I. G. Nobre Silva J. H. Bédard G. Morris |
author_sort |
F. M. Deegan |
title |
Age and Geochemistry of High Arctic Large Igneous Province Tholeiitic Magmatism in NW Axel Heiberg Island, Canada |
title_short |
Age and Geochemistry of High Arctic Large Igneous Province Tholeiitic Magmatism in NW Axel Heiberg Island, Canada |
title_full |
Age and Geochemistry of High Arctic Large Igneous Province Tholeiitic Magmatism in NW Axel Heiberg Island, Canada |
title_fullStr |
Age and Geochemistry of High Arctic Large Igneous Province Tholeiitic Magmatism in NW Axel Heiberg Island, Canada |
title_full_unstemmed |
Age and Geochemistry of High Arctic Large Igneous Province Tholeiitic Magmatism in NW Axel Heiberg Island, Canada |
title_sort |
age and geochemistry of high arctic large igneous province tholeiitic magmatism in nw axel heiberg island, canada |
publisher |
Wiley |
publishDate |
2023 |
url |
https://doi.org/10.1029/2023GC011083 https://doaj.org/article/685a6ef0bab8474195170217ed84eeb7 |
long_lat |
ENVELOPE(-91.001,-91.001,79.752,79.752) ENVELOPE(-94.919,-94.919,80.719,80.719) ENVELOPE(13.964,13.964,66.424,66.424) ENVELOPE(-103.505,-103.505,78.785,78.785) |
geographic |
Arctic Axel Heiberg Island Bukken Fiord Canada Heiberg Isachsen |
geographic_facet |
Arctic Axel Heiberg Island Bukken Fiord Canada Heiberg Isachsen |
genre |
Arctic Axel Heiberg Island sverdrup basin |
genre_facet |
Arctic Axel Heiberg Island sverdrup basin |
op_source |
Geochemistry, Geophysics, Geosystems, Vol 24, Iss 11, Pp n/a-n/a (2023) |
op_relation |
https://doi.org/10.1029/2023GC011083 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2023GC011083 https://doaj.org/article/685a6ef0bab8474195170217ed84eeb7 |
op_doi |
https://doi.org/10.1029/2023GC011083 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
24 |
container_issue |
11 |
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1787422094444724224 |