Terrestrial record of Laurentide Ice Sheet reorganization during Heinrich events

Abstract

Research Article| November 01, 1997 Terrestrial record of Laurentide Ice Sheet reorganization during Heinrich events Howard D. Mooers; Howard D. Mooers 1Department of Geology, University of Minnesota, Duluth, Minnesota 55812 Search for other works by this author on: GSW Google Scholar J. D. Lehr J. D. Lehr 2Minnesota Department of Natural Resources, Division of Minerals, 500 Lafayette Road, St. Paul, Minnesota 55155 Search for other works by this author on: GSW Google Scholar Author and Article Information Howard D. Mooers 1Department of Geology, University of Minnesota, Duluth, Minnesota 55812 J. D. Lehr 2Minnesota Department of Natural Resources, Division of Minerals, 500 Lafayette Road, St. Paul, Minnesota 55155 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1997) 25 (11): 987–990. https://doi.org/10.1130/0091-7613(1997)025<0987:TROLIS>2.3.CO;2 Article history 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 Howard D. Mooers, J. D. Lehr; Terrestrial record of Laurentide Ice Sheet reorganization during Heinrich events. Geology 1997;; 25 (11): 987–990. doi: https://doi.org/10.1130/0091-7613(1997)025<0987:TROLIS>2.3.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 The glacial stratigraphy and geomorphology of the western Lake Superior region record a complex sequence of late Wisconsinan ice advances and retreats of the Laurentide Ice Sheet from accumulation centers in Quebec and Hudson Bay. Geomorphic evidence indicates that three major late Wisconsinan events occurred, each marked by gradual buildup of ice, formation of a prominent moraine, and subsequent rapid ice retreat. The established radiocarbon chronology indicates that these three events culminated ca. 23–21, 16–15.5, and 13 14C ka, indicating that major glacial advances culminated immediately prior to Heinrich events H-2 and H-1, and that ice underwent rapid retreat during Heinrich events.The possible linkage between western Lake Superior region ice dynamics and Heinrich events is supported by the presence of indicator rock types in drift associated with each major glacial recession. These indicators suggest that progressive southward shifts of the Laurentide Ice Sheet ice divide accompanied each rapid glacial recession. Furthermore, lithologic evidence indicates that there were two episodes of ice divide shifts: one ∼400–600 km occurring during H-2, and a smaller shift occurring during H-1. 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.