| ID |
1645 |
| Citation |
Brennand, T.A., Lian, O.B., Perkins, A.J., 2014. The life and times of the Cordilleran Ice Sheet around the southern Fraser Plateau, British Columbia, in: Dashtgard, S., Ward, B. (Eds.), Trials and Tribulations of Life on an Active Subduction Zone: Field Trips in and Around Vancouver, Canada. Geological Soc Amer Inc, Boulder, pp. 101–124. |
| Organization |
Simon Fraser University; University of the Fraser Valley |
| URL |
https://pubs.geoscienceworld.org/books/book/912/chapter/4671391/The-life-and-times-of-the-Cordilleran-Ice-Sheet |
| Abstract/Description or Keywords |
This field guide focuses on glacial history, dynamics and processes, and postglacial landscape adjustments in the southern Fraser Plateau region. Located between the Coast and Columbia Mountains in south-central British Columbia, Canada, the southern Fraser Plateau was near the geographic center of the last (marine oxygen isotope stage [MIS] 2) Cordilleran Ice Sheet (CIS). The transition from cold to warm-based ice during MIS 2 is recorded in till sedimentology and structural geology. The perceived absence of large deglacial recessional moraines has been used as evidence that ice regionally stagnated because of a rapid rise in equilibrium line altitude. However, glacioisostatic rebound orientations, ice-marginal channel and grounding-line and push moraine distributions, and reconstructions of late-glacial ice-marginal lake evolution suggest a systematic northwestward pattern of active ice-margin retreat toward the Coast Mountains, accompanied by regional thinning. Eskers and erosional corridors record drainage of supraglacial lakes or ice-marginal water sources in or over thin ice. Many ice-dammed lakes drained catastrophically. Following lake drainage, streams incised valley fills, leaving behind terraces capped by paraglacial fans and eolian sediment. In sum, we examine (1) valley-fill sediments that record Quaternary history dating back to the early or mid-Pleistocene; (2) till, moraines, erosional corridors, and eskers that provide evidence for MIS 2 CIS dynamics and hydrology; (3) late-glacial ice-marginal lake sediments and landforms that allow reconstruction of lake evolution and drainage, and changing ice-margin positions; and (4) the character and ages of river terraces, paraglacial fans, and eolian sediments that record the timing and nature of postglacial landscape adjustments. |
| Information Type |
Chapter |
| Regional Watershed |
Fraser River |
| Sub-watershed if known |
|
| Aquifer # |
|
| Comments |
|
| Project status |
|
| Contact Name |
Tracy Brennand |
| Contact Email |
[email protected] |
