Palaeogeographical reconstruction and hydrology of glacial Lake Purcell during MIS 2 and its potential impact on the Channeled Scabland, USA
Large, ice‐marginal lakes that were impounded by the maximally extended Cordilleran Ice Sheet ( CIS ) provided source waters for the extraordinarily large floods that formed the Channeled Scabland of Washington and Idaho, USA . However, flood flows that drained CIS meltwater and contributed to lands...
Published in: | Boreas |
---|---|
Main Authors: | , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2020
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/bor.12434 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12434 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12434 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12434 |
id |
crwiley:10.1111/bor.12434 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/bor.12434 2024-09-15T18:12:29+00:00 Palaeogeographical reconstruction and hydrology of glacial Lake Purcell during MIS 2 and its potential impact on the Channeled Scabland, USA Peters, Jared L. Brennand, Tracy A. Natural Sciences and Engineering Research Council of Canada 2020 http://dx.doi.org/10.1111/bor.12434 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12434 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12434 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12434 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Boreas volume 49, issue 3, page 461-476 ISSN 0300-9483 1502-3885 journal-article 2020 crwiley https://doi.org/10.1111/bor.12434 2024-07-23T04:16:51Z Large, ice‐marginal lakes that were impounded by the maximally extended Cordilleran Ice Sheet ( CIS ) provided source waters for the extraordinarily large floods that formed the Channeled Scabland of Washington and Idaho, USA . However, flood flows that drained CIS meltwater and contributed to landscape evolution during later stages of deglaciation have hitherto been poorly investigated. This paper provides the first evidence for such a late deglacial floodwater source: glacial Lake Purcell ( gLP ). Sedimentary evidence records the northward extension of gLP from Idaho, USA into British Columbia, Canada and establishes its minimum palaeogeographical extent. Sedimentary evidence suggests that the deglacial Purcell Lobe was a capable ice dam that impounded large volumes of gLP water. A review of glacio‐isostatically affected lakes during CIS deglaciation suggests that gLP could have been subjected to tilts ranging from 0 to >1.25 m km −1 . Sedimentary evidence suggests high lake plane tilts (⪆1.25 m km −1 ) are the most likely to have affected gLP . Using this, the palaeogeography and volume of gLP are modelled, revealing that ~116 km 3 of water was susceptible to sudden drainage into the Channeled Scabland via the Columbia River system. This calculation is supported by sedimentary and geomorphic evidence compatible with energetic flood flows along the gLP drainage route and suggests gLP drained suddenly, causing significant landscape change. Article in Journal/Newspaper Ice Sheet Wiley Online Library Boreas 49 3 461 476 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Large, ice‐marginal lakes that were impounded by the maximally extended Cordilleran Ice Sheet ( CIS ) provided source waters for the extraordinarily large floods that formed the Channeled Scabland of Washington and Idaho, USA . However, flood flows that drained CIS meltwater and contributed to landscape evolution during later stages of deglaciation have hitherto been poorly investigated. This paper provides the first evidence for such a late deglacial floodwater source: glacial Lake Purcell ( gLP ). Sedimentary evidence records the northward extension of gLP from Idaho, USA into British Columbia, Canada and establishes its minimum palaeogeographical extent. Sedimentary evidence suggests that the deglacial Purcell Lobe was a capable ice dam that impounded large volumes of gLP water. A review of glacio‐isostatically affected lakes during CIS deglaciation suggests that gLP could have been subjected to tilts ranging from 0 to >1.25 m km −1 . Sedimentary evidence suggests high lake plane tilts (⪆1.25 m km −1 ) are the most likely to have affected gLP . Using this, the palaeogeography and volume of gLP are modelled, revealing that ~116 km 3 of water was susceptible to sudden drainage into the Channeled Scabland via the Columbia River system. This calculation is supported by sedimentary and geomorphic evidence compatible with energetic flood flows along the gLP drainage route and suggests gLP drained suddenly, causing significant landscape change. |
author2 |
Natural Sciences and Engineering Research Council of Canada |
format |
Article in Journal/Newspaper |
author |
Peters, Jared L. Brennand, Tracy A. |
spellingShingle |
Peters, Jared L. Brennand, Tracy A. Palaeogeographical reconstruction and hydrology of glacial Lake Purcell during MIS 2 and its potential impact on the Channeled Scabland, USA |
author_facet |
Peters, Jared L. Brennand, Tracy A. |
author_sort |
Peters, Jared L. |
title |
Palaeogeographical reconstruction and hydrology of glacial Lake Purcell during MIS 2 and its potential impact on the Channeled Scabland, USA |
title_short |
Palaeogeographical reconstruction and hydrology of glacial Lake Purcell during MIS 2 and its potential impact on the Channeled Scabland, USA |
title_full |
Palaeogeographical reconstruction and hydrology of glacial Lake Purcell during MIS 2 and its potential impact on the Channeled Scabland, USA |
title_fullStr |
Palaeogeographical reconstruction and hydrology of glacial Lake Purcell during MIS 2 and its potential impact on the Channeled Scabland, USA |
title_full_unstemmed |
Palaeogeographical reconstruction and hydrology of glacial Lake Purcell during MIS 2 and its potential impact on the Channeled Scabland, USA |
title_sort |
palaeogeographical reconstruction and hydrology of glacial lake purcell during mis 2 and its potential impact on the channeled scabland, usa |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1111/bor.12434 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12434 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12434 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12434 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Boreas volume 49, issue 3, page 461-476 ISSN 0300-9483 1502-3885 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/bor.12434 |
container_title |
Boreas |
container_volume |
49 |
container_issue |
3 |
container_start_page |
461 |
op_container_end_page |
476 |
_version_ |
1810450067657588736 |