Research Article| August 01, 1982 Wisconsin and Holocene δ18O variations, Barnes Ice Cap, Canada ROGER LeB. HOOKE; ROGER LeB. HOOKE 1Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota 55455 Search for other works by this author on: GSW Google Scholar HENRIK B. CLAUSEN HENRIK B. CLAUSEN 2Geophysical Isotope Laboratory, University of Copenhagen, Denmark Search for other works by this author on: GSW Google Scholar Author and Article Information ROGER LeB. HOOKE 1Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota 55455 HENRIK B. CLAUSEN 2Geophysical Isotope Laboratory, University of Copenhagen, Denmark Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1982) 93 (8): 784–789. https://doi.org/10.1130/0016-7606(1982)93<784:WAHOVB>2.0.CO;2 Article history First Online: 01 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 ROGER LeB. HOOKE, HENRIK B. CLAUSEN; Wisconsin and Holocene δ18O variations, Barnes Ice Cap, Canada. GSA Bulletin 1982;; 93 (8): 784–789. doi: https://doi.org/10.1130/0016-7606(1982)93<784:WAHOVB>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 SocietyGSA Bulletin Search Advanced Search Abstract New δ18O measurements on ice samples from Barnes Ice Cap show a relatively large shift from about −23‰ in the blue ice that makes up the bulk of the ice cap to −38‰ in a basal layer of clean white ice. This strongly suggests that the latter is of Pleistocene age, thus confirming an earlier interpretation based on less comprehensive data. The shift between the Pleistocene and Holocene ice is attributed in part to the change in climate at the end of the Pleistocene, and in part to a decrease in elevation of the accumulation area of ∼ 700 m. Beneath the clean white ice, there is a layer of dirty white ice with less negative δ18O values. This ice is believed to have been deposited during a climatically warm period in early to middle Wisconsin time. In addition, however, the less negative δ18O values in it are, in part, attributed to fractionation at a time in the past when the basal ice was at the melting point, and some of the water produced by pressure melting was lost through a permeable bed. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.