Late-glacial alpine glacier advance and early Holocene tephras, northern British Columbia
Two related studies in northern British Columbia are presented. The first documents moraines in Finlay River area that record an advance of alpine glaciers. A minimum age of 9230 radiocarbon yr BP and the relation of moraines to ice-stagnation deposits suggest the advance is Younger Dryas in age. Th...
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2006
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ftsimonfu:oai:summit.sfu.ca:6262 2023-05-15T16:00:27+02:00 Late-glacial alpine glacier advance and early Holocene tephras, northern British Columbia Lakeman, Thomas Ryan 2006 http://summit.sfu.ca/item/6262 English eng http://summit.sfu.ca/item/6262 Thesis 2006 ftsimonfu 2022-04-07T18:34:45Z Two related studies in northern British Columbia are presented. The first documents moraines in Finlay River area that record an advance of alpine glaciers. A minimum age of 9230 radiocarbon yr BP and the relation of moraines to ice-stagnation deposits suggest the advance is Younger Dryas in age. The advance demonstrates Younger Dryas glacier expansion differs in magnitude in western Canada, suggesting a complex glacier response to late-glacial climate change. The second study describes four early Holocene tephras. Two phonolitic tephras, older than 9180 radiocarbon yr BP, were found in sediments from Finlay River and Dease Lake areas. Their source may be a large volcano in northwest British Columbia. Two other tephras were recovered from Bob Quinn Lake. A lower basaltic tephra was produced by an eruption near Iskut River 8400 radiocarbon yr ago. The upper phonolitic tephra is 6000-7000 radiocarbon yr old. Thesis Dease Lake Summit - SFU Research Repository (Simon Fraser University) Canada British Columbia ENVELOPE(-125.003,-125.003,54.000,54.000) Dease Lake ENVELOPE(-129.987,-129.987,58.436,58.436) Dryas Glacier ENVELOPE(-70.994,-70.994,82.035,82.035) 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) |
institution |
Open Polar |
collection |
Summit - SFU Research Repository (Simon Fraser University) |
op_collection_id |
ftsimonfu |
language |
English |
description |
Two related studies in northern British Columbia are presented. The first documents moraines in Finlay River area that record an advance of alpine glaciers. A minimum age of 9230 radiocarbon yr BP and the relation of moraines to ice-stagnation deposits suggest the advance is Younger Dryas in age. The advance demonstrates Younger Dryas glacier expansion differs in magnitude in western Canada, suggesting a complex glacier response to late-glacial climate change. The second study describes four early Holocene tephras. Two phonolitic tephras, older than 9180 radiocarbon yr BP, were found in sediments from Finlay River and Dease Lake areas. Their source may be a large volcano in northwest British Columbia. Two other tephras were recovered from Bob Quinn Lake. A lower basaltic tephra was produced by an eruption near Iskut River 8400 radiocarbon yr ago. The upper phonolitic tephra is 6000-7000 radiocarbon yr old. |
format |
Thesis |
author |
Lakeman, Thomas Ryan |
spellingShingle |
Lakeman, Thomas Ryan Late-glacial alpine glacier advance and early Holocene tephras, northern British Columbia |
author_facet |
Lakeman, Thomas Ryan |
author_sort |
Lakeman, Thomas Ryan |
title |
Late-glacial alpine glacier advance and early Holocene tephras, northern British Columbia |
title_short |
Late-glacial alpine glacier advance and early Holocene tephras, northern British Columbia |
title_full |
Late-glacial alpine glacier advance and early Holocene tephras, northern British Columbia |
title_fullStr |
Late-glacial alpine glacier advance and early Holocene tephras, northern British Columbia |
title_full_unstemmed |
Late-glacial alpine glacier advance and early Holocene tephras, northern British Columbia |
title_sort |
late-glacial alpine glacier advance and early holocene tephras, northern british columbia |
publishDate |
2006 |
url |
http://summit.sfu.ca/item/6262 |
long_lat |
ENVELOPE(-125.003,-125.003,54.000,54.000) ENVELOPE(-129.987,-129.987,58.436,58.436) ENVELOPE(-70.994,-70.994,82.035,82.035) 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 |
Canada British Columbia Dease Lake Dryas Glacier Iskut Finlay River Bob Quinn Lake Iskut River |
geographic_facet |
Canada British Columbia Dease Lake Dryas Glacier Iskut Finlay River Bob Quinn Lake Iskut River |
genre |
Dease Lake |
genre_facet |
Dease Lake |
op_relation |
http://summit.sfu.ca/item/6262 |
_version_ |
1766396423932215296 |