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• W2014335672 abstract "An expanded and improved Wisconsinan stratigraphy of southeastern Canada, with revised correlations, has led to a new hypothesis on ice-mass shape and movement, since the last glacial maximum, which involves: (1) a refinement of the interpretations and correlations of continental climatostratigraphy; (2) the formulation of a model for the dynamics of the margins of the ice sheet which is not necessarily related to climate; and (3) the determination of the contribution of the ice mass to (a) variations in ocean volume and (b) to variations in oceanic 18O. In contradiction to oceanic sequences which are both continuous and sensitive to climatic changes, continental sequences are characteristically discontinuous, reflect local or regional paleoenvironments (grounded margins, ice-shelf, etc.), are subject to the limitations of 14C dating and tend to locally exaggerate fluctuations of global climate (glacial/interglacial, stadial/interstadial). During the last glacial maximum of the Wisconsinan State, the ice sheet was a multidome complex with several centres of outflow and satellite ice caps. The eastern margin of grounded ice corresponded roughly to the present coastline. The volume of ice was less than in the model of the single-dome mega-ice sheet which is commonly used. This problem must be considered when calculating the oceanic volume and 18O variations. Ice retreat was characterized by large fluctuations of the ice margin, that were unrelated to climatic variations. These fluctuations reflected phases of restoration of ice-profile equilibrium, as evidenced by reequilibration moraines (e.g. Sakami moraine) and by huge ice surges (e.g. Cochrane episodes). Temporary retention of large water volumes in glacial lakes and inland seas induced a time-lag between the climatic amelioration and subsequent oceanic response (e.g. sea levels). The irregular ice retreat and the retention of water masses on the continent combined to produce a step-by-step increase in ocean volume (eustatic pulses). Complex geoidal readjustments during Late Glacial and Postglacial times might therefore be expected." @default.
• W2014335672 created "2016-06-24" @default.
• W2014335672 creator A5045735677 @default.
• W2014335672 date "1983-11-01" @default.
• W2014335672 modified "2023-10-02" @default.
• W2014335672 title "Laurentide ice sheet: Oceanic and climatic implications" @default.
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• W2014335672 doi "https://doi.org/10.1016/0031-0182(83)90002-0" @default.
• W2014335672 hasPublicationYear "1983" @default.
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