A revised stratigraphic framework for Cretaceous sedimentary and igneous rocks at Mokka Fiord, Axel Heiberg Island, Nunavut, with implications for the Cretaceous Normal Superchron
New data and interpretations on geological relationships of igneous rocks at Mokka Fiord, Axel Heiberg Island, Nunavut, provide insight into the timing and nature of magmatism associated with the Sverdrup Basin and High Arctic Large Igneous Province (HALIP). Field relationships indicate that the ign...
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crcansciencepubl:10.1139/cjes-2018-0129 2023-12-17T10:26:14+01:00 A revised stratigraphic framework for Cretaceous sedimentary and igneous rocks at Mokka Fiord, Axel Heiberg Island, Nunavut, with implications for the Cretaceous Normal Superchron Evenchick, Carol A. Galloway, Jennifer M. Saumur, Benoit M. Davis, William J. 2019 http://dx.doi.org/10.1139/cjes-2018-0129 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjes-2018-0129 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjes-2018-0129 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 56, issue 2, page 158-174 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2019 crcansciencepubl https://doi.org/10.1139/cjes-2018-0129 2023-11-19T13:38:25Z New data and interpretations on geological relationships of igneous rocks at Mokka Fiord, Axel Heiberg Island, Nunavut, provide insight into the timing and nature of magmatism associated with the Sverdrup Basin and High Arctic Large Igneous Province (HALIP). Field relationships indicate that the igneous rocks, previously interpreted to be volcanic flows, are most likely an intrusive unit discordant to regional bedding. An intrusive origin helps resolve chronostratigraphic inconsistencies in previous work. The host rocks are palynologically constrained to be late Barremian to late Aptian in age and are interpreted to be Paterson Island or Walker Island member of the Isachsen Formation. If the igneous body is intrusive, it’s previously reported Ar–Ar age (102.5 ± 2.6 Ma) is no longer in conflict with accepted stratigraphic interpretations and probably reflects the emplacement age of the intrusion. Lingering uncertainties in interpreting the normal and reverse magnetic polarities determined in the previous work remain, and both are considered viable. Although this uncertainty precludes definitive conclusions on the significance of paleomagnetic data at Mokka Fiord, examination of the stratigraphic, paleomagnetic, and geochronologic relationships there highlight potential for the study of excursions, or reversed magnetic polarity subchrons, in the Cretaceous Normal Superchron elsewhere in the HALIP. Article in Journal/Newspaper Arctic Axel Heiberg Island Isachsen Nunavut sverdrup basin Canadian Science Publishing (via Crossref) Arctic Nunavut Heiberg ENVELOPE(13.964,13.964,66.424,66.424) Axel Heiberg Island ENVELOPE(-91.001,-91.001,79.752,79.752) Paterson ENVELOPE(-154.600,-154.600,-78.033,-78.033) Isachsen ENVELOPE(-103.505,-103.505,78.785,78.785) Mokka Fiord ENVELOPE(-87.250,-87.250,79.585,79.585) Canadian Journal of Earth Sciences 56 2 158 174 |
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 Evenchick, Carol A. Galloway, Jennifer M. Saumur, Benoit M. Davis, William J. A revised stratigraphic framework for Cretaceous sedimentary and igneous rocks at Mokka Fiord, Axel Heiberg Island, Nunavut, with implications for the Cretaceous Normal Superchron |
topic_facet |
General Earth and Planetary Sciences |
description |
New data and interpretations on geological relationships of igneous rocks at Mokka Fiord, Axel Heiberg Island, Nunavut, provide insight into the timing and nature of magmatism associated with the Sverdrup Basin and High Arctic Large Igneous Province (HALIP). Field relationships indicate that the igneous rocks, previously interpreted to be volcanic flows, are most likely an intrusive unit discordant to regional bedding. An intrusive origin helps resolve chronostratigraphic inconsistencies in previous work. The host rocks are palynologically constrained to be late Barremian to late Aptian in age and are interpreted to be Paterson Island or Walker Island member of the Isachsen Formation. If the igneous body is intrusive, it’s previously reported Ar–Ar age (102.5 ± 2.6 Ma) is no longer in conflict with accepted stratigraphic interpretations and probably reflects the emplacement age of the intrusion. Lingering uncertainties in interpreting the normal and reverse magnetic polarities determined in the previous work remain, and both are considered viable. Although this uncertainty precludes definitive conclusions on the significance of paleomagnetic data at Mokka Fiord, examination of the stratigraphic, paleomagnetic, and geochronologic relationships there highlight potential for the study of excursions, or reversed magnetic polarity subchrons, in the Cretaceous Normal Superchron elsewhere in the HALIP. |
format |
Article in Journal/Newspaper |
author |
Evenchick, Carol A. Galloway, Jennifer M. Saumur, Benoit M. Davis, William J. |
author_facet |
Evenchick, Carol A. Galloway, Jennifer M. Saumur, Benoit M. Davis, William J. |
author_sort |
Evenchick, Carol A. |
title |
A revised stratigraphic framework for Cretaceous sedimentary and igneous rocks at Mokka Fiord, Axel Heiberg Island, Nunavut, with implications for the Cretaceous Normal Superchron |
title_short |
A revised stratigraphic framework for Cretaceous sedimentary and igneous rocks at Mokka Fiord, Axel Heiberg Island, Nunavut, with implications for the Cretaceous Normal Superchron |
title_full |
A revised stratigraphic framework for Cretaceous sedimentary and igneous rocks at Mokka Fiord, Axel Heiberg Island, Nunavut, with implications for the Cretaceous Normal Superchron |
title_fullStr |
A revised stratigraphic framework for Cretaceous sedimentary and igneous rocks at Mokka Fiord, Axel Heiberg Island, Nunavut, with implications for the Cretaceous Normal Superchron |
title_full_unstemmed |
A revised stratigraphic framework for Cretaceous sedimentary and igneous rocks at Mokka Fiord, Axel Heiberg Island, Nunavut, with implications for the Cretaceous Normal Superchron |
title_sort |
revised stratigraphic framework for cretaceous sedimentary and igneous rocks at mokka fiord, axel heiberg island, nunavut, with implications for the cretaceous normal superchron |
publisher |
Canadian Science Publishing |
publishDate |
2019 |
url |
http://dx.doi.org/10.1139/cjes-2018-0129 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjes-2018-0129 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjes-2018-0129 |
long_lat |
ENVELOPE(13.964,13.964,66.424,66.424) ENVELOPE(-91.001,-91.001,79.752,79.752) ENVELOPE(-154.600,-154.600,-78.033,-78.033) ENVELOPE(-103.505,-103.505,78.785,78.785) ENVELOPE(-87.250,-87.250,79.585,79.585) |
geographic |
Arctic Nunavut Heiberg Axel Heiberg Island Paterson Isachsen Mokka Fiord |
geographic_facet |
Arctic Nunavut Heiberg Axel Heiberg Island Paterson Isachsen Mokka Fiord |
genre |
Arctic Axel Heiberg Island Isachsen Nunavut sverdrup basin |
genre_facet |
Arctic Axel Heiberg Island Isachsen Nunavut sverdrup basin |
op_source |
Canadian Journal of Earth Sciences volume 56, issue 2, page 158-174 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjes-2018-0129 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
56 |
container_issue |
2 |
container_start_page |
158 |
op_container_end_page |
174 |
_version_ |
1785577944298553344 |