Journal article
Timing, provenance, and implications of two MIS 3 advances of the Laurentide Ice Sheet into the Upper Mississippi River Basin, USA
Quaternary science reviews, Vol.261, p.106926
06/01/2021
DOI: 10.1016/j.quascirev.2021.106926
Abstract
Evidence for a glacial advance into the Upper Mississippi River Basin between Marine Isotope Stage (MIS) 2 and MIS 6 has been debated for over a century. New sedimentological and chronological data provide evidence for two advances of the Laurentide Ice Sheet (LIS) into Iowa during MIS 3 to the east and west of the local glacial maximum margin. The lithology of the MIS 3 till is similar to the MIS 2 Des Moines Lobe till, which suggests both tills were sourced from the Keewatin Dome. A synthesis of new and previously collected radiocarbon ages indicate the two advances reached their terminus near 42⁰ N around 42 ka and 30 ka. A comparison of this record with published loess chronology and provenance studies suggests that these advances were likely a glacial source for the Mississippi Valley Roxana Silt and the Pisgah Formation loess in the Missouri River Valley. The apparent discrepancy between the basal ages of the Roxana and Pisgah loesses may be due to the timing of Des Moines Lobe entering the Mississippi River watershed before the Missouri River watershed. The results of this study demonstrate that the LIS advanced much farther south during MIS 3 than previously recognized, which has significant implications for ice sheet and paleoclimate modeling.
•Radiocarbon ages place Keewatin-sourced ice in the Mississippi Basin during MIS 3.•The southwestern Laurentide Ice Sheet reached ∼42°N around 42 and 30 ka.•Advances of the Des Moines Lobe provided source sediment for MIS 3 loess.•Loess deposits and records in the Gulf of Mexico show signals of these advances.•There was likely no ice west of the Des Moines Lobe during MIS 3.
Details
- Title: Subtitle
- Timing, provenance, and implications of two MIS 3 advances of the Laurentide Ice Sheet into the Upper Mississippi River Basin, USA
- Creators
- Phillip J Kerr - University of IowaStephanie A Tassier-Surine - University of IowaSusan M Kilgore - Adelphi UniversityE. Arthur Bettis - University of IowaJeffrey A Dorale - University of IowaBradley D Cramer - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Quaternary science reviews, Vol.261, p.106926
- Publisher
- Elsevier Ltd
- DOI
- 10.1016/j.quascirev.2021.106926
- ISSN
- 0277-3791
- eISSN
- 1873-457X
- Grant note
- DOI: 10.13039/100000203, name: U.S. Geological Survey, award: G16AC00196, G17AC00258, G18AC00194; DOI: 10.13039/100003187, name: NSF; DOI: 10.13039/100009171, name: Natural Resources Conservation Service; DOI: 10.13039/100000001, name: National Science Foundation, award: GP-IMPACT-1600429
- Language
- English
- Date published
- 06/01/2021
- Academic Unit
- Office Of The Provost; International Programs; Earth and Environmental Sciences; IIHR--Hydroscience and Engineering
- Record Identifier
- 9984229167902771
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