| Title | Stratigraphic architecture and sediment facies of the western Oak Ridges Moraine, Humber River watershed, southern Ontario |
| Author | Russell, H A J; Arnott, R W C; Sharpe, D R |
| Source | Glacial history, paleogeography and paleoenvironments in glaciated North America [part 1]; by Wolfe, S A (ed.); Plouffe, A (ed.); Géographie physique et Quaternaire vol. 58, (2004), no. 2-3, 2006 p.
241-267, https://doi.org/10.7202/013141ar (Open Access) |
| Year | 2006 |
| Alt Series | Geological Survey of Canada, Contribution Series 2005129 |
| Publisher | Consortium Erudit |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf (Adobe® Reader®) |
| Province | Ontario |
| NTS | 30M/11; 30M/12; 30M/13; 30M/14; 31D/03; 31D/04; 40P/16; 41A/01 |
| Area | Humber River; Toronto; Gormley; Vandorf |
| Lat/Long WENS | -80.1667 -79.3333 44.1667 43.6167 |
| Subjects | surficial geology/geomorphology; sedimentology; hydrogeology; glacial landforms; moraines; eskers; buried valleys; tunnel valleys; meltwater channels; glaciofluvial deposits; glaciolacustrine deposits;
ice contact deposits; fans; glacial lakes; groundwater resources; aquifers; groundwater regimes; flow systems; depositional models; depositional environment; depositional history; sedimentary structures; sedimentation rates; sediment distribution;
sediments; facies; paleohydrology; paleodrainage; discharge rates; glacial history; glaciation; deglaciation; Wisconsinian glacial stage; rhythmites; Oak Ridges Moraine; Humber River watershed; Laurentian Valley; Lake Ontario basin; Laurentide Ice
Sheet; subglacial lakes; paleoflow; channel fill; Phanerozoic; Cenozoic; Quaternary |
| Illustrations | sketch maps; digital elevation models; stratigraphic charts; 3-D models; cross-sections; histograms; stratigraphic sections; core logs; tables; photographs; graphs; 3-D diagrams; block
diagrams |
| Program | Groundwater |
| Released | 2006 07 18 |
| Abstract | The Oak Ridges Moraine in southern Ontario is a ca. 160 km long east-west trending ridge of sand and gravel situated north of Lake Ontario. Study of the Oak Ridges Moraine in the Humber River watershed
was undertaken to assess its role in the groundwater system of the buried Laurentian Valley. The Oak Ridges Moraine is interpreted to have been deposited in three stages. Stage I records rapid deposition from hyperconcentrated flows where tunnel
channels discharged into a subglacial lake in the Lake Ontario basin. Low-energy basin sedimentation of Stage II was in a subglacial and ice-contact setting of a highly crevassed ice sheet. Stage III sedimentation is characterized by rapid facies
changes associated with esker, subaqueous fan, and basinal sedimentation. Detailed sediment analysis challenges the concept that the Oak Ridges Moraine was deposited principally from seasonal meltwater discharges, climatic modulated ice-marginal
fluctuations, or in an interlobate position. Instead it is interpreted to have formed in response to late-glacial ice sheet events associated with subglacial meltwater ponding, episodic and catastrophic subglacial meltwater discharge, and subsequent
seasonal meltwater discharge. The moraine probably formed as the glacial-hydraulic system re-equilibrated to the presence of a thinned, grounded ice shelf and a subglacial lake in the Lake Ontario basin. |
| GEOSCAN ID | 220736 |
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