The postglacial history of Lake Manitoba has been deduced from a study of the changes in physical, mineralogical, and chemical variables in sediment cores collected from the lake. Six lithostratigraphic units are recognized in the South Basin
of the lake. Weakly developed pedogenic zones, reflecting dry or extremely low water conditions in the basin, separate five of these six units. The initial phase of lacustrine sedimentation in the Lake Manitoba basin began shortly after 12,000 yr B.P. as water
Pedogenic zones in postglacial sediment of lake Manitoba, Canada
Canada ; Gley ; Géographie physique ; Holocène ; Lac ; Manitoba, lac ; Niveau lacustre ; Pédogenèse ; Quaternaire zones froides ; Sol hydromorphe ; Sédiment lacustre
Les sédiments postglaciaires du lac Manitoba sont composés d'argiles fines assez homogènes dans leurs propriétés physico-chimiques et minéralogiques, à part quatre zones qui ont une faible capacité de rétention, une structure grumeleuse à pelletale