Highstands and overflow history of glacial Lake Chicago and downstream impacts on Gulf of Mexico δ18O values

Research output: Contribution to journalArticle

Abstract

Linked and complex relationships of runoff from deglacial sedimentary systems to ocean basins likely contribute to the murky global signals of Heinrich Stadial 1 (ca. 17.5-14.5 cal. kyr B.P.). However, precise chronologies linking meltwater sources, transport, and oceanic sinks are lacking for this period. A probability density function of new and published radiocarbon dates shows Lake Chicago, a large meltwater lake adjacent to the Lake Michigan lobe of the Laurentide Ice Sheet, had two highstands, the Glenwood and Calumet phases, which occurred from ca. 17.0-15.0 cal. kyr B.P. and 14.0-12.4 cal. kyr B.P., respectively. Ages of the highest stands of Lake Chicago and high sediment accumulation rates at 16.5, 16.0, 15.1, 14.1, and 13.4 cal. kyr B.P. temporally correspond to large pulses of meltwater recorded in the δ18O values of Globigerinoides ruber (pink and white foraminifera) in sediment cores from the Orca Basin (Gulf of Mexico). We demonstrate overflow of meltwater via the Chicago outlet during highstands resulted in complex downstream responses, including burial of terrestrial plants in scoured alluvial channels, abandonment of riverine terraces, and coeval decreases in Gulf of Mexico stable oxygen isotope ratios.

Original languageEnglish (US)
Pages (from-to)667-670
Number of pages4
JournalGeology
Volume46
Issue number7
DOIs
StatePublished - Jul 1 2018

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glacial lake
highstand
meltwater
lake
history
Laurentide Ice Sheet
oxygen isotope ratio
ocean basin
probability density function
accumulation rate
foraminifera
terrace
sediment core
chronology
stable isotope
runoff
gulf
basin
sediment

ASJC Scopus subject areas

  • Geology

Cite this

Highstands and overflow history of glacial Lake Chicago and downstream impacts on Gulf of Mexico δ18O values. / Curry, B. Brandon; Bruegger, A. R.; Conroy, Jessica.

In: Geology, Vol. 46, No. 7, 01.07.2018, p. 667-670.

Research output: Contribution to journalArticle

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