Palaeogeographical reconstruction and hydrology of glacial Lake Purcell during MIS 2 and its potential impact on the Channeled Scabland, USA

Simple item page
dc.contributor.authorPeters, Jared L.
dc.contributor.authorBrennand, Tracy A.
dc.contributor.funderNatural Sciences and Engineering Research Council of Canadaen
dc.contributor.funderGeological Society of Americaen
dc.date.accessioned2020-02-14T09:43:31Z
dc.date.available2020-02-14T09:43:31Z
dc.date.issued2020-01-31
dc.date.updated2020-02-13T12:53:27Z
dc.description.abstractLarge, 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 km3 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.en
dc.description.sponsorshipNatural Sciences and Engineering Research Council of Canada (Discovery Grant194107); Geological Society of America (Graduate Research Grant)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationPeters, J. L. and Brennand, T. A. (2020) 'Palaeogeographical reconstruction and hydrology of glacial Lake Purcell during MIS 2 and its potential impact on the Channeled Scabland, USA', Boreas. doi: 10.1111/bor.12434en
dc.identifier.doi10.1111/bor.12434en
dc.identifier.eissn1502-3885
dc.identifier.issn0300-9483
dc.identifier.journaltitleBoreasen
dc.identifier.urihttps://hdl.handle.net/10468/9651
dc.language.isoenen
dc.publisherJohn Wiley & Sons, Inc.en
dc.relation.urihttps://onlinelibrary.wiley.com/doi/abs/10.1111/bor.12434
dc.rights© 2020, John Wiley & Sons, Inc. This is the peer reviewed version of the following article: Peters, J. L. and Brennand, T. A. (2020) 'Palaeogeographical reconstruction and hydrology of glacial Lake Purcell during MIS 2 and its potential impact on the Channeled Scabland, USA', Boreas, doi: 10.1111/bor.12434, which has been published in final form at https://doi.org/10.1111/bor.12434. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.en
dc.subjectLakesen
dc.subjectCordilleran Ice Sheeten
dc.subjectCISen
dc.subjectSource watersen
dc.subjectFloodsen
dc.subjectChanneled Scablanden
dc.subjectWashingtonen
dc.subjectIdahoen
dc.titlePalaeogeographical reconstruction and hydrology of glacial Lake Purcell during MIS 2 and its potential impact on the Channeled Scabland, USAen
dc.typeArticle (peer-reviewed)en
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
petersbrennand_20_boreas_glp_accepted_version.pdf
Size:
1.15 MB
Format:
Adobe Portable Document Format
Description:
Accepted Version
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
2.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Biological, Earth and Environmental Sciences - Journal Articles