Investigation of a Possible Lead-Lag Relationship Between the Innuitian and Laurentide Ice Sheets, Arctic Canada

<p>Peaks of iron-rich grains in Arctic Ocean sediment cores matched to the Laurentide and Innuitian Ice Sheets appear to show a lead-lag relationship during the Late Pleistocene when grain abundances are plotted against time and depth below sea floor. Cores from across the Arctic have been analyzed to determine if this is the case. Of the six IRD events identified, the Innuitian leads 68% of the time with 26% of events in all cores occurring simultaneously. The Innuitian seems to lead 33.3% of the time when peaks from the Innuitian and Laurentide occur within close proximity (less than 1 cm), with 41.7% of the Innuitian and Laurentide peaks occurring simultaneously. Innuitian IRD events lasted an average of 1.5 to 3 kyr, while Laurentide events lasted an average of 1.1 to 2 kyr. A particularly well-dated event around 18 ka in PS1230 shows the Laurentide lagging the Innuitian by around 250 years. This short response time suggests that instabilities can be rapidly transmitted from one coalesced ice sheet to another.</p>

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Ocean & Earth Sciences

Year dc:date.available

2007

Author dc:creator

• Zimmerman, Paula

Contributors dc:contributor

• Dennis Darby
• Jens Bischof
• G. R. Whittecar

• Ice sheets
• Arctic
• Canada
• Geology

Statement dc:rights

• <p>In Copyright. URI: <a href="http://rightsstatements.org/vocab/InC/1.0/">http://rightsstatements.org/vocab/InC/1.0/</a> This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).</p>

Identifier

9780549320654

OAI identifier oai:identifier

oai:digitalcommons.odu.edu:oeas_etds-1022