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Area of Science:

  • Quaternary geology
  • Sedimentology
  • Glaciology

Background:

  • Paleogeographic reconstruction of ice sheet retreat often relies on moraine mapping.
  • Deltaic complexes from meltwater offer an alternative record of ice margin positions.

Purpose of the Study:

  • To examine ice-contact, glaciofluvial, and paraglacial depositional systems along the Québec North Shore.
  • To refine the retreat model of the Laurentide Ice Sheet (LIS) using deltaic complexes.

Main Methods:

  • Analysis of ice-contact, ice-distal glaciofluvial, and paraglacial depositional systems.
  • Development of four end-member scenarios for depositional system distribution.
  • Application of these scenarios to twenty deltaic complexes.

Main Results:

  • Ice-contact systems formed while the LIS was present.
  • Glaciofluvial deltas prograded rapidly as the ice margin retreated.
  • Paraglacial processes marked the ice margin's final retreat from drainage basins.

Conclusions:

  • Depositional systems reflect both drainage basin physiography and ice margin retreat patterns.
  • The study refined the LIS margin retreat model over southeastern Québec.