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- W2002024930 endingPage "65" @default.
- W2002024930 startingPage "55" @default.
- W2002024930 abstract "Postglacial varved and rhythmically-laminated clays deposited during the transition from glacial Lake Vermont (LV) to the Champlain Sea (CS) record hydrological changes in the Champlain-St. Lawrence Valley (CSLV) at the onset of the Younger Dryas ∼13.1–12.9 ka linked to glacial lake drainage events. Oxygen isotope (δ18O) records of three species of benthic foraminifera (Cassidulina reniforme, Haynesina orbiculare, Islandiella helenae) from six sediment cores and the freshwater ostracode Candona from one core were studied. Results show six large isotope excursions (∼0.5 to >2‰) in C. reniforme δ18O values, five excursions in H. orbiculare (<0.5 to ∼1.8‰), and five smaller changes in I. helenae (<0.5‰). δ18O values in Candona show a 1.5–2‰ increase in the same interval. These isotopic excursions in co-occurring marine and freshwater species in varve-like sediments indicate complex hydrological changes in the earliest Champlain Sea, including brief (sub-annual) periods of complete freshening. One hypothesis to explain these results is that multiple abrupt freshwater influx events caused surface-to-bottom freshening of the Champlain Sea over days to weeks. The most likely source of freshwater would have been drainage of the Morehead Phase of glacial Lake Agassiz, perhaps in a series of floods, ultimately draining out the St. Lawrence Estuary." @default.
- W2002024930 created "2016-06-24" @default.
- W2002024930 creator A5026251160 @default.
- W2002024930 creator A5028711972 @default.
- W2002024930 creator A5047416347 @default.
- W2002024930 creator A5055594425 @default.
- W2002024930 creator A5066547704 @default.
- W2002024930 date "2012-05-01" @default.
- W2002024930 modified "2023-09-26" @default.
- W2002024930 title "Stable isotope evidence for glacial lake drainage through the St. Lawrence Estuary, eastern Canada, ∼13.1–12.9 ka" @default.
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- W2002024930 doi "https://doi.org/10.1016/j.quaint.2011.08.041" @default.
- W2002024930 hasPublicationYear "2012" @default.