Nazko cone: a Quaternary volcano in the eastern Anahim Belt
Nazko cone, located in central British Columbia at the eastern end of the Anahim Volcanic Belt, is the product of at least three episodes of Quaternary volcanic activity. An eroded Pleistocene subaerial flow at the base of the pile is overlain by a subglacial mound of hyaloclastite that is, in turn,...
Published in: | Canadian Journal of Earth Sciences |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1987
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/e87-232 http://www.nrcresearchpress.com/doi/pdf/10.1139/e87-232 |
id |
crcansciencepubl:10.1139/e87-232 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/e87-232 2024-04-07T07:53:16+00:00 Nazko cone: a Quaternary volcano in the eastern Anahim Belt Souther, J. G. Clague, J. J. Mathewes, R. W. 1987 http://dx.doi.org/10.1139/e87-232 http://www.nrcresearchpress.com/doi/pdf/10.1139/e87-232 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 24, issue 12, page 2477-2485 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1987 crcansciencepubl https://doi.org/10.1139/e87-232 2024-03-08T00:37:44Z Nazko cone, located in central British Columbia at the eastern end of the Anahim Volcanic Belt, is the product of at least three episodes of Quaternary volcanic activity. An eroded Pleistocene subaerial flow at the base of the pile is overlain by a subglacial mound of hyaloclastite that is, in turn, partly covered by a younger composite pyroclastic cone and associated lava flows. A whole-rock K–Ar date of 0.34 ± 0.03 Ma on the oldest flow is consistent with a hotspot model for the Anahim Belt and implies absolute late Neogene motion of 2.6 cm/year for North America. The hyaloclastite mound was erupted beneath the Cordilleran Ice Sheet during the Late Pleistocene, perhaps during the Fraser Glaciation (25 000 – 10 000 years BP). Radiocarbon dates from peat above and below Nazko tephra in a bog near the cone suggest that the volcano last erupted about 7200 years BP.Nazko basalt has 10–15% normative nepheline and is classified as basanite. This is significantly more undersaturated than basalts farther west in the Anahim Belt and may indicate an eastward shift toward a deeper or less depleted mantle source. Article in Journal/Newspaper Ice Sheet Canadian Science Publishing Canadian Journal of Earth Sciences 24 12 2477 2485 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Souther, J. G. Clague, J. J. Mathewes, R. W. Nazko cone: a Quaternary volcano in the eastern Anahim Belt |
topic_facet |
General Earth and Planetary Sciences |
description |
Nazko cone, located in central British Columbia at the eastern end of the Anahim Volcanic Belt, is the product of at least three episodes of Quaternary volcanic activity. An eroded Pleistocene subaerial flow at the base of the pile is overlain by a subglacial mound of hyaloclastite that is, in turn, partly covered by a younger composite pyroclastic cone and associated lava flows. A whole-rock K–Ar date of 0.34 ± 0.03 Ma on the oldest flow is consistent with a hotspot model for the Anahim Belt and implies absolute late Neogene motion of 2.6 cm/year for North America. The hyaloclastite mound was erupted beneath the Cordilleran Ice Sheet during the Late Pleistocene, perhaps during the Fraser Glaciation (25 000 – 10 000 years BP). Radiocarbon dates from peat above and below Nazko tephra in a bog near the cone suggest that the volcano last erupted about 7200 years BP.Nazko basalt has 10–15% normative nepheline and is classified as basanite. This is significantly more undersaturated than basalts farther west in the Anahim Belt and may indicate an eastward shift toward a deeper or less depleted mantle source. |
format |
Article in Journal/Newspaper |
author |
Souther, J. G. Clague, J. J. Mathewes, R. W. |
author_facet |
Souther, J. G. Clague, J. J. Mathewes, R. W. |
author_sort |
Souther, J. G. |
title |
Nazko cone: a Quaternary volcano in the eastern Anahim Belt |
title_short |
Nazko cone: a Quaternary volcano in the eastern Anahim Belt |
title_full |
Nazko cone: a Quaternary volcano in the eastern Anahim Belt |
title_fullStr |
Nazko cone: a Quaternary volcano in the eastern Anahim Belt |
title_full_unstemmed |
Nazko cone: a Quaternary volcano in the eastern Anahim Belt |
title_sort |
nazko cone: a quaternary volcano in the eastern anahim belt |
publisher |
Canadian Science Publishing |
publishDate |
1987 |
url |
http://dx.doi.org/10.1139/e87-232 http://www.nrcresearchpress.com/doi/pdf/10.1139/e87-232 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Canadian Journal of Earth Sciences volume 24, issue 12, page 2477-2485 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e87-232 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
24 |
container_issue |
12 |
container_start_page |
2477 |
op_container_end_page |
2485 |
_version_ |
1795668948016955392 |