| Title | Glacial dispersal-trains in North America. Part 2: interpretation |
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| Author | Russell, H A J ;
Cummings, D I |
| Source | RFG 2018 - Resources for Future Generations, abstract volume; 1996, 2018 p. 1 |
| Links | Online - En ligne (pdf, 83 KB)
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| Image |  |
| Year | 2018 |
| Alt Series | Natural Resources Canada, Contribution Series 20170368 |
| Publisher | International Union of Geological Sciences |
| Meeting | RFG 2018 - Resources for Future Generations; Vancouver, BC; CA; June 16-21, 2018 |
| Document | book |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is related to Glacial dispersal-trains in
North America. Part 1: description |
| File format | pdf |
| Province | Canada; British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut |
| NTS | 1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65;
66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560 |
| Area | Canada; United States of America |
| Lat/Long WENS | -141.0000 -52.0000 90.0000 40.0000 |
| Lat/Long WENS | -141.0000 -50.0000 90.0000 41.7500 |
| Subjects | surficial geology/geomorphology; economic geology; glacial deposits; tills; sands; glacial features; glacial landforms; drumlins; glacial history; glaciation; deglaciation; ice sheets; sedimentation
dynamics; bedrock geology; lithology; igneous rocks; intrusive rocks; kimberlites; mineral deposits; mineral exploration; exploration methods; models; MZ Dyke dispersal train; CL-25 dispersal train; Laurentide Ice Sheet; dispersal trains;
Phanerozoic; Cenozoic; Quaternary |
| Program | GEM2: Geo-mapping for Energy and Minerals GEM Synthesis |
| Released | 2018 06 01 |
| Abstract | Sedimentary work beneath ice sheets-the generation of striations, drumlins, and dispersal trains-is commonly perceived to occur near the ice-sheet margin, beneath warm-based ice streams, whereas the
interiors of ice sheets are commonly perceived as performing little sedimentary work due to sluggish flow and/or cold-based conditions. Here we document till dispersal-trains from northern Canada that question the universality of this perception. The
MZ Dyke and CL-25 dispersal trains are linear trails of sand-sized indicator minerals in till that extend tens of kilometers westward of their kimberlite sources. Two sets of drumlins cross-cut the dispersal trains, and do so at a relatively high
angle-approximately 25° and 12°, respectively. This suggests the trains formed prior to the drumlins, and likely farther upflow beneath the Laurentide Ice Sheet, and that drumlinization was a later and apparently erosive process that did not rework
the sediment into a fan-shaped palimpsest train. Mineral-exploration models that only emphasize ice-marginal processes need to be reconsidered: it appears that dispersal trains can, at least in some cases, form farther upflow beneath the ice sheet,
prior to drumlinization. |
| Summary | (Plain Language Summary, not published)
Details indicator dispersal within a till sheet with cross cutting drumlins. Raises questions related to till genesis, and landform origin. |
| GEOSCAN ID | 306633 |
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