Regional stratigraphy and age of Chilcotin Group basalts, south-central British Columbia
Mio-Pliocene Chilcotin Group basalt flows form a 50 000 km 2 lava plateau in south-central British Columbia. Two periods of eruptive activity at 2–3 and 6–10 Ma are indicated by a compilation of available age data, including 10 new K–Ar age determinations, and basalts from these two periods are chem...
Published in: | Canadian Journal of Earth Sciences |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1983
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/e83-049 http://www.nrcresearchpress.com/doi/pdf/10.1139/e83-049 |
id |
crcansciencepubl:10.1139/e83-049 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/e83-049 2024-03-24T09:02:49+00:00 Regional stratigraphy and age of Chilcotin Group basalts, south-central British Columbia Bevier, Mary Lou 1983 http://dx.doi.org/10.1139/e83-049 http://www.nrcresearchpress.com/doi/pdf/10.1139/e83-049 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 20, issue 4, page 515-524 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1983 crcansciencepubl https://doi.org/10.1139/e83-049 2024-02-26T15:23:02Z Mio-Pliocene Chilcotin Group basalt flows form a 50 000 km 2 lava plateau in south-central British Columbia. Two periods of eruptive activity at 2–3 and 6–10 Ma are indicated by a compilation of available age data, including 10 new K–Ar age determinations, and basalts from these two periods are chemically indistinguishable. The Chilcotin Group consists of thin, crudely columnar-jointed pahoehoe flows, some thick, tiered flows, pillow lava and pillow breccia, and rare silicic tephra layers. The presence of many vesicle sheets and cylinders and collapsed pahoehoe toes suggests that the basalts were volatile-rich. Known vents (gabbro and basalt plugs) for the basalt flows form a northwest trend along the axis of the lava plateau. The plateau appears to have formed from the overlap of many low-profile shield volcanoes and is similar in morphology to other plains basalts such as the Snake River Plain and parts of Iceland. Glaciation has stripped off an unknown volume of the flat-lying basalt flows. Article in Journal/Newspaper Iceland Canadian Science Publishing Canadian Journal of Earth Sciences 20 4 515 524 |
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 Bevier, Mary Lou Regional stratigraphy and age of Chilcotin Group basalts, south-central British Columbia |
topic_facet |
General Earth and Planetary Sciences |
description |
Mio-Pliocene Chilcotin Group basalt flows form a 50 000 km 2 lava plateau in south-central British Columbia. Two periods of eruptive activity at 2–3 and 6–10 Ma are indicated by a compilation of available age data, including 10 new K–Ar age determinations, and basalts from these two periods are chemically indistinguishable. The Chilcotin Group consists of thin, crudely columnar-jointed pahoehoe flows, some thick, tiered flows, pillow lava and pillow breccia, and rare silicic tephra layers. The presence of many vesicle sheets and cylinders and collapsed pahoehoe toes suggests that the basalts were volatile-rich. Known vents (gabbro and basalt plugs) for the basalt flows form a northwest trend along the axis of the lava plateau. The plateau appears to have formed from the overlap of many low-profile shield volcanoes and is similar in morphology to other plains basalts such as the Snake River Plain and parts of Iceland. Glaciation has stripped off an unknown volume of the flat-lying basalt flows. |
format |
Article in Journal/Newspaper |
author |
Bevier, Mary Lou |
author_facet |
Bevier, Mary Lou |
author_sort |
Bevier, Mary Lou |
title |
Regional stratigraphy and age of Chilcotin Group basalts, south-central British Columbia |
title_short |
Regional stratigraphy and age of Chilcotin Group basalts, south-central British Columbia |
title_full |
Regional stratigraphy and age of Chilcotin Group basalts, south-central British Columbia |
title_fullStr |
Regional stratigraphy and age of Chilcotin Group basalts, south-central British Columbia |
title_full_unstemmed |
Regional stratigraphy and age of Chilcotin Group basalts, south-central British Columbia |
title_sort |
regional stratigraphy and age of chilcotin group basalts, south-central british columbia |
publisher |
Canadian Science Publishing |
publishDate |
1983 |
url |
http://dx.doi.org/10.1139/e83-049 http://www.nrcresearchpress.com/doi/pdf/10.1139/e83-049 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Canadian Journal of Earth Sciences volume 20, issue 4, page 515-524 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e83-049 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
20 |
container_issue |
4 |
container_start_page |
515 |
op_container_end_page |
524 |
_version_ |
1794403269364154368 |