Late Glacial retreat of the Lancaster Sound Ice Sheet and early Holocene Parry Channel throughflow; 2008029-59CC (Composite Core), 2008029-49CC, 2013029-64PC (Piston Core) datasets (2008)

• Main Authors: Robert V. Kelleher, Anne Jennings, John T. Andrews, Nicole Brooks, Thomas Marchitto, Shaoting "Cici" Feng, Lineke Woelders
• Format: Dataset
• Language: unknown
• Published: Arctic Data Center 2022
• Subjects: Parry; BBDC; Lancaster; Laurentide; Arctic; Benthic; Baffin; Nares; Planktic; Retreat; Channel; Deglaciation; Angulogerina flurens; Astrononion gallowayi; Bolivina arctica; Brizalina pseudopunctata; Bucella frigida; Buccella tenerrima; Buliminella elegantissima; Cassidulina neoteretis; Cassidulina reniforme; Ceratobulimina arctica; Cibicides lobulatus; Cyclogra involvens; Elphidium albiumbilicatum; Elphiduim asklundi; Elphidium excavatum; Epistominella arctica; Epistominella exigua; Epistominella takayanagii; Eoeponidella pulchella; Epistominella vitrea; Fissurina crebra; Fissurina laevigata; Fissurina globosa; Fissurina serrata; Fissurina maginata; Globobulimina auriculata arctica; Glomulina oculus; Guttulina lactea; Hannai arctica; Islandiella norcrossi; Islandiella helenae; Lagina laevis; Melonis barleeanus; Nonionella labradorica; Nonionella iridea; Nonionella turgida; Oolina apiculata; Oolina caudigera; Oridorsalis umbonatus; Parafissurina fusuliformis; Patellina corugata; Procerolagena gracilis; Quinqueloculina arctica; Quinqueloculina seminula; Robertinoides charlottensis; Stainforthia concava; Stainforthia feylingi; Stetsonia horvathi; Triloculina tricarinata; Adercotryma glomerata; Cribrostomoides crassimargo; Cribrostomoides jeffreysi; Cuneata arctica; Portatrochammina bipolaris; Reophax bilocularis; Reophax catella; Reophax catenata; Reophax dentaliniformis; Reophax horrida; Reophax guttifer; Reophax pilolifera; Reophax scorpiurus; Saccammina atlantica; Saccammina diflugiformis; Saccammina sphaera; Silicosigmoilina groenlandica; Spiroplectammina biformis; Textularia earlandi; Textularia torquata; Pseudobolivina antarctica; Tritaxis bullata; Trochammina globigeriniformis; Trochammina cf. inflata; Trochammina japonica; Trochammina nitida; Trochammina orchracea; Trochammina quadriloba; Neogloboquadrina pachyderma; Globigerina bulloides; Cornuspira involvens; Elphidium clavatum; Elphidium magellanicum; Haplophragmoides cf. bradyi; flurens; gallowayi; arctica; pseudopunctata; frigida; tenerrima; elegantissima; neoteretis; reniforme; lobulatus; involvens; albiumbilicatum; asklundi; excavatum; exigua; takayanagii; pulchella; vitrea; crebra; laevigata; globosa; serrata; maginata; auriculata arctica; oculus; lactea; norcrossi; helenae; laevis; barleeanus; labradorica; iridea; turgida; apiculata; caudigera; umbonatus; fusuliformis; corugata; gracilis; seminula; charlottensis; concava; feylingi; horvathi; tricarinata; glomerata; crassimargo; jeffreysi; bipolaris; bilocularis; catella; catenata; dentaliniformis; horrida; guttifer; pilolifera; scorpiurus; atlantica; diflugiformis; sphaera; groenlandica; biformis; earlandi; torquata; antarctica; bullata; globigeriniformis; cf. inflata; japonica; nitida; orchracea; quadriloba; pachyderma; bulloides; clavatum; magellanicum; cf. bradyi; Baffin Bay; Lancaster Sound; Antarc*; Antarctica; Foraminifera*; Ice Sheet; Nares strait; Parry Channel; Sea ice
• Online Access: https://doi.org/10.18739/A2GM81Q31

Multiple proxies in three sediment cores from Northwestern Baffin Bay document the timing of Lancaster Sound Ice Stream (LSIS) retreat that led to Arctic-Atlantic throughflow in Parry Channel, an important source of freshwater that can impact the Atlantic Meridional Overturning Circulation (AMOC). The Late Glacial to Holocene timing of ice retreat and channel opening and the responses of the regional ocean environment to these events are presented. We use quantitative mineral composition, foraminiferal assemblages, biogenic silica, ice-rafted debris (IRD), and 14C (carbon-14)-based age models to document and date the events and environmental changes occurring during deglaciation of this major marine channel. Findings show that retreat of the LSIS into Lancaster Sound occurred before ~15.3 cal ka BP (calculated kilo annum before present), about 800 years before the onset of major ice berg calving events from the LSIS, named the Baffin Bay Detrital carbonates events (BBDC 1 and BBDC 0). The end of BBDC 0 occurred at ~10.6 cal ka BP, which coincides with the opening of Parry Channel. A marine environment productive of calcareous benthic and planktic foraminifera, with diminished meltwater, seasonal sea ice, warmer summer temperatures and inflowing, nutrient-rich Arctic Surface Water characterizes the interval between the opening of Parry Channel and the opening of Nares Strait. Paired planktic and benthic 14C ages over this 2200-year interval show diminishing age offsets suggesting progressive mixing of the upper ~900 m (meters) of the water column. The opening of Nares Strait by ~8.2 cal ka BP coincides with increased biogenic silica in the form of abundant, large centric diatoms and dissolution of CaCO3 (calcium carbonate). The paucity of calcareous organisms after 8.2 cal ka BP resulted in poor chronological control in the cores to interpret changing environments after 8.2 cal ka BP.