Rice, Jessey M., Menzies, John, Paulen, Roger C., McClenaghan, M. Beth (2019) Microsedimentological evidence of vertical fluctuations in subglacial stress from the northwest sector of the Laurentide Ice Sheet, Northwest Territories, Canada. Canadian Journal of Earth Sciences, 56 (4) 363-379 doi:10.1139/cjes-2018-0201
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Microsedimentological evidence of vertical fluctuations in subglacial stress from the northwest sector of the Laurentide Ice Sheet, Northwest Territories, Canada | ||
| Journal | Canadian Journal of Earth Sciences | ||
| Authors | Rice, Jessey M. | Author | |
| Menzies, John | Author | ||
| Paulen, Roger C. | Author | ||
| McClenaghan, M. Beth | Author | ||
| Year | 2019 (April) | Volume | 56 |
| Issue | 4 | ||
| Publisher | Canadian Science Publishing | ||
| DOI | doi:10.1139/cjes-2018-0201Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 485570 | Long-form Identifier | mindat:1:5:485570:9 |
| GUID | 0 | ||
| Full Reference | Rice, Jessey M., Menzies, John, Paulen, Roger C., McClenaghan, M. Beth (2019) Microsedimentological evidence of vertical fluctuations in subglacial stress from the northwest sector of the Laurentide Ice Sheet, Northwest Territories, Canada. Canadian Journal of Earth Sciences, 56 (4) 363-379 doi:10.1139/cjes-2018-0201 | ||
| Plain Text | Rice, Jessey M., Menzies, John, Paulen, Roger C., McClenaghan, M. Beth (2019) Microsedimentological evidence of vertical fluctuations in subglacial stress from the northwest sector of the Laurentide Ice Sheet, Northwest Territories, Canada. Canadian Journal of Earth Sciences, 56 (4) 363-379 doi:10.1139/cjes-2018-0201 | ||
| In | (2019, April) Canadian Journal of Earth Sciences Vol. 56 (4) Canadian Science Publishing | ||
| Abstract/Notes | The past-producing Pine Point lead–zinc mining district, Northwest Territories, Canada, provides a unique opportunity to study the role of glacial dynamics in a thick, continuous till succession that has not been influenced by the underlying bedrock topography. Parts of the Pine Point mining district are covered by >20 m of subglacial Quaternary sediments (till) associated with the former Laurentide Ice Sheet. Till facies exposed in unreclaimed open-pit K-62 have been classified into four separate units. Micro- and macrosedimentological analyses were undertaken to identify the change in subglacial stress during sediment deposition and across till unit boundaries. An analysis of high- and low-angle microshears (lineations) in thin sections produced from these till units indicate that there is a noticeable decrease in the abundance of low-angle shear features immediately below till unit boundaries. The deformation of low-angle shears in the underlying tills was likely caused by remobilization of the overlying till unit. This remobilization is consistent with aggradation-constant entrainment decay mechanisms for subglacial till emplacement and accretion and subglacial dispersion models. | ||
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