Cosmogenic 10Be ages of the Saglek Moraines, Torngat Mountains, Labrador

Research Article| July 01, 2003 Cosmogenic 10Be ages of the Saglek Moraines, Torngat Mountains, Labrador Peter U. Clark; Peter U. Clark 1Department of Geosciences, Oregon State University, Corvallis, Oregon 97331, USA Search for other works by this author on: GSW Google Scholar Edward J. Brook; Edward J. Brook 2Department of Geology and Program in Environmental Science, Washington State University, Vancouver, Washington 98686, USA Search for other works by this author on: GSW Google Scholar Grant M. Raisbeck; Grant M. Raisbeck 3Centre de Spectrométrie Nucleaire et de Spectrométrie de Masse, IN2P3-CNRS, Bât 108, 91405 Orsay Cedex, France4Department of Geosciences, Oregon State University, Corvallis, Oregon 97331, USA Search for other works by this author on: GSW Google Scholar Francoise Yiou; Francoise Yiou 4Department of Geosciences, Oregon State University, Corvallis, Oregon 97331, USA Search for other works by this author on: GSW Google Scholar Jorie Clark Jorie Clark 4Department of Geosciences, Oregon State University, Corvallis, Oregon 97331, USA Search for other works by this author on: GSW Google Scholar Geology (2003) 31 (7): 617–620. https://doi.org/10.1130/0091-7613(2003)031<0617:CBAOTS>2.0.CO;2 Article history received: 20 Dec 2002 rev-recd: 19 Mar 2003 accepted: 29 Mar 2003 first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Peter U. Clark, Edward J. Brook, Grant M. Raisbeck, Francoise Yiou, Jorie Clark; Cosmogenic 10Be ages of the Saglek Moraines, Torngat Mountains, Labrador. Geology 2003;; 31 (7): 617–620. doi: https://doi.org/10.1130/0091-7613(2003)031<0617:CBAOTS>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Cosmogenic 10Be ages on boulders from the Saglek Moraines of the Torngat Mountains, Labrador, suggest that the moraines were deposited in their type area 13.4 ± 1.5 ka. The 10Be ages on boulders from similar moraines in a valley system 100 km north of the type area yield a mean age of 12.0 ± 2.1 10Be ka. These data support the hypothesis that the Saglek Moraines were deposited by a regional system of outlet glaciers that drained the Laurentide Ice Sheet and left extensive areas of the Torngat Mountains ice free as nunataks. Weighted mean ages for erratic boulders and bedrock 5–50 m higher in elevation than the Saglek Moraines at both field areas are indistinguishable at 1σ from the weighted mean ages of moraines in each area. These data either indicate that thicker late Wisconsinan ice receded to the level of the Saglek Moraines at 12–13 10Be ka, or that the Saglek ice margin represents the maximum late Wisconsinan extent, but the ice margin fluctuated sufficiently to create a vertical zone of ∼50 m with essentially the same exposure history. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.