Minimum limiting deglacial ages for the out-of-phase Saginaw Lobe of the Laurentide Ice Sheet using optically stimulated luminescence (OSL) and radiocarbon methods

TitleMinimum limiting deglacial ages for the out-of-phase Saginaw Lobe of the Laurentide Ice Sheet using optically stimulated luminescence (OSL) and radiocarbon methods
Publication TypeJournal Article
Year of Publication2020
AuthorsFisher, TG, Dziekan, MR, McDonald, J, Lepper, K, Loope, HM, McCarthy, FMG, B. Curry, B
JournalQuaternary Research
Volume97
Pagination71 - 87
Date PublishedJan-09-2020
ISSN0033-5894
KeywordsDeglaciation, Lake sediment cores, OSL dating, Radiocarbon lag, Saginaw Lobe, Sturgis Moraine
Abstract

Twenty-four new optically stimulated luminescence (OSL) and radiocarbon ages from sediment cores in nine lakes associated with the Shipshewana and Sturgis moraines in northern Indiana and southern Michigan estimate when recession of the Saginaw Lobe of the Laurentide Ice Sheet was underway in the southern Great Lakes region, USA. Average OSL ages of 23.4 ± 2.2 ka for the Shipshewana Moraine and 19.7 ± 2.2 ka for the Sturgis Moraine are considered minimum limiting deglacial ages for these recessional moraines. The much younger radiocarbon ages are consistent with other regional radiocarbon ages from lakes, and record climate amelioration around ~16.5 cal ka BP. Early recession of the interlobate Saginaw Lobe was well underway by 23.4 ± 2.2 ka, when the adjacent Lake Michigan and Huron-Erie lobes were a few hundred kilometers farther south and near their maximum southerly limits. The results provide the first time constraints when sediment from the Lake Michigan and Huron-Erie lobes began filling the accommodation space left by the Saginaw Lobe. The difference between the oldest radiocarbon and OSL age is 7400 yr for the Shipshewana Moraine and 3400 yr for the Sturgis Moraine.

URLhttps://www.cambridge.org/core/journals/quaternary-research/article/minimum-limiting-deglacial-ages-for-the-outofphase-saginaw-lobe-of-the-laurentide-ice-sheet-using-optically-stimulated-luminescence-osl-and-radiocarbon-methods/EA67A66F68407581E99D7D3A8F1
DOI10.1017/qua.2020.12