Holocene tephras in lake cores from northern British Columbia, Canada
Sediment cores recovered from alpine and subalpine lakes up to 250 km apart in northern British Columbia contain five previously unrecognized tephras. Two black phonolitic tephras, each 5–10 mm thick, occur within 2–4 cm of each other in basal sediments from seven lakes in the Finlay River – Dease L...
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crcansciencepubl:10.1139/e08-035 2023-12-17T10:29:22+01:00 Holocene tephras in lake cores from northern British Columbia, Canada Lakeman, Thomas R. Clague, John J. Menounos, Brian Osborn, Gerald D. Jensen, Britta J.L. Froese, Duane G. Hollings, A.E. 2008 http://dx.doi.org/10.1139/e08-035 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E08-035 http://www.nrcresearchpress.com/doi/pdf/10.1139/E08-035 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 45, issue 8, page 935-947 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2008 crcansciencepubl https://doi.org/10.1139/e08-035 2023-11-19T13:39:01Z Sediment cores recovered from alpine and subalpine lakes up to 250 km apart in northern British Columbia contain five previously unrecognized tephras. Two black phonolitic tephras, each 5–10 mm thick, occur within 2–4 cm of each other in basal sediments from seven lakes in the Finlay River – Dease Lake area. The upper and lower Finlay tephras are slightly older than 10 220 – 10 560 cal year B.P. and likely originate from two closely spaced eruptions of one or two large volcanoes in the northern Cordilleran volcanic province. The Finlay tephras occur at the transition between deglacial sediments and organic-rich postglacial mud in the lake cores and, therefore, closely delimit the termination of the Fraser Glaciation in northern British Columbia. Sediments in Bob Quinn Lake, which lies on the east edge of the northern Coast Mountains, contain two black tephras that differ in age and composition from the Finlay tephras. The lower Bob Quinn tephra is 3–4 mm thick, basaltic in composition, and is derived from an eruption in the Iskut River volcanic field about 9400 cal years ago. The upper Bob Quinn tephra is 12 mm thick, trachytic in composition, and probably 7000–8000 cal years old. A fifth tephra occurs as a cryptotephra near the top of two cores from the Finlay River area and is correlated to the east lobe of the White River tephra (ca. 1150 cal year B.P.). Although present throughout southern Yukon, the White River tephra has not previously been documented this far south in British Columbia. The tephras are valuable new isochrons for future paleoenvironmental studies in northern British Columbia. Article in Journal/Newspaper Dease Lake Yukon Canadian Science Publishing (via Crossref) Yukon Canada British Columbia ENVELOPE(-125.003,-125.003,54.000,54.000) Dease Lake ENVELOPE(-129.987,-129.987,58.436,58.436) Iskut ENVELOPE(-129.988,-129.988,57.838,57.838) Finlay River ENVELOPE(-124.953,-124.953,56.900,56.900) Bob Quinn Lake ENVELOPE(-130.271,-130.271,56.966,56.966) Iskut River ENVELOPE(-131.667,-131.667,56.733,56.733) Canadian Journal of Earth Sciences 45 8 935 947 |
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 Lakeman, Thomas R. Clague, John J. Menounos, Brian Osborn, Gerald D. Jensen, Britta J.L. Froese, Duane G. Holocene tephras in lake cores from northern British Columbia, Canada |
topic_facet |
General Earth and Planetary Sciences |
description |
Sediment cores recovered from alpine and subalpine lakes up to 250 km apart in northern British Columbia contain five previously unrecognized tephras. Two black phonolitic tephras, each 5–10 mm thick, occur within 2–4 cm of each other in basal sediments from seven lakes in the Finlay River – Dease Lake area. The upper and lower Finlay tephras are slightly older than 10 220 – 10 560 cal year B.P. and likely originate from two closely spaced eruptions of one or two large volcanoes in the northern Cordilleran volcanic province. The Finlay tephras occur at the transition between deglacial sediments and organic-rich postglacial mud in the lake cores and, therefore, closely delimit the termination of the Fraser Glaciation in northern British Columbia. Sediments in Bob Quinn Lake, which lies on the east edge of the northern Coast Mountains, contain two black tephras that differ in age and composition from the Finlay tephras. The lower Bob Quinn tephra is 3–4 mm thick, basaltic in composition, and is derived from an eruption in the Iskut River volcanic field about 9400 cal years ago. The upper Bob Quinn tephra is 12 mm thick, trachytic in composition, and probably 7000–8000 cal years old. A fifth tephra occurs as a cryptotephra near the top of two cores from the Finlay River area and is correlated to the east lobe of the White River tephra (ca. 1150 cal year B.P.). Although present throughout southern Yukon, the White River tephra has not previously been documented this far south in British Columbia. The tephras are valuable new isochrons for future paleoenvironmental studies in northern British Columbia. |
author2 |
Hollings, A.E. |
format |
Article in Journal/Newspaper |
author |
Lakeman, Thomas R. Clague, John J. Menounos, Brian Osborn, Gerald D. Jensen, Britta J.L. Froese, Duane G. |
author_facet |
Lakeman, Thomas R. Clague, John J. Menounos, Brian Osborn, Gerald D. Jensen, Britta J.L. Froese, Duane G. |
author_sort |
Lakeman, Thomas R. |
title |
Holocene tephras in lake cores from northern British Columbia, Canada |
title_short |
Holocene tephras in lake cores from northern British Columbia, Canada |
title_full |
Holocene tephras in lake cores from northern British Columbia, Canada |
title_fullStr |
Holocene tephras in lake cores from northern British Columbia, Canada |
title_full_unstemmed |
Holocene tephras in lake cores from northern British Columbia, Canada |
title_sort |
holocene tephras in lake cores from northern british columbia, canada |
publisher |
Canadian Science Publishing |
publishDate |
2008 |
url |
http://dx.doi.org/10.1139/e08-035 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E08-035 http://www.nrcresearchpress.com/doi/pdf/10.1139/E08-035 |
long_lat |
ENVELOPE(-125.003,-125.003,54.000,54.000) ENVELOPE(-129.987,-129.987,58.436,58.436) ENVELOPE(-129.988,-129.988,57.838,57.838) ENVELOPE(-124.953,-124.953,56.900,56.900) ENVELOPE(-130.271,-130.271,56.966,56.966) ENVELOPE(-131.667,-131.667,56.733,56.733) |
geographic |
Yukon Canada British Columbia Dease Lake Iskut Finlay River Bob Quinn Lake Iskut River |
geographic_facet |
Yukon Canada British Columbia Dease Lake Iskut Finlay River Bob Quinn Lake Iskut River |
genre |
Dease Lake Yukon |
genre_facet |
Dease Lake Yukon |
op_source |
Canadian Journal of Earth Sciences volume 45, issue 8, page 935-947 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e08-035 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
45 |
container_issue |
8 |
container_start_page |
935 |
op_container_end_page |
947 |
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1785581738617995264 |