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Glacial geology
Published in Barry G. Clarke, Engineering of Glacial Deposits, 2017
As a glacier melts, debris is transported by water to be deposited on, within, beneath or beyond the glacier creating glaciofluvial deposits that have similar geotechnical characteristics to other fluvial deposits as they are gravitationally consolidated. If a glacier terminates in water, sedimentation of glacial debris creates glaciolacustrine deposits when formed in a standing body of fresh water such as that found at ice margins; and glaciomarine deposits when a glacier terminates in the sea. The full list of glacial soils is given in Table 2.1 and their evolution in Figures 2.5 through 2.8.
A Ground-Penetrating Radar Study of Peat Landforms in the Discontinuous Permafrost Zone Near Fort Simpson, Northwest Territories, Canada
Published in Carl C. Trettin, Martin F. Jurgensen, David F. Grigal, Margaret R. Gale, John K. Jeglum, Northern Forested Wetlands, 2018
Inez M. Kettles, Stephen D. Robinson
The Fort Simpson area, which lies at the confluence of the Liard and Mackenzie Rivers (61°52’N, 121°21’W), is underlain by flat-lying Devonian shales and siltstones (Douglas, 1959) (Figure 1). The bedrock is overlain by till and, in low lying areas, glaciolacustrine fine-grained sediments (Vincent, 1989; Smith, 1992). Glaciolacustrine sediments are, in places, overlain by postglacial deltaic sands and silts, upon which aeolian dunes have commonly formed (Minning et al., 1980; Smith, 1992). Modern alluvial sands and gravels occur along the Liard and Mackenzie Rivers.
The Continental Sedimentary Environment
Published in Aurèle Parriaux, Geology, 2018
The fine glaciolacustrine sediments are very poor foundation material, for the same reasons as lacustrine sediments, except that the former may have been compacted by the ice load.
The potential for palaeoseismic and palaeoclimatic reconstructions from Lake Tennyson, North Canterbury, New Zealand
Published in New Zealand Journal of Geology and Geophysics, 2023
John-Mark Woolley, Andrew Lorrey, Paul Augustinus, Patricia S. Gadd
The majority of the elemental signatures in the Lake Tennyson sediments revealed in µ-XRF core scans are representative of clastic sedimentation and are thus likely representative of erosion-driven sediment influx sourced from the surrounding catchment. The paleoclimate research potential for the lake sediments therefore partly lies in the interpretation of climatic drivers of increased or decreased erosion, but with the significant caveat that seismic signals may manifest in the lacustrine sediment in a similar way. There are also abundant peat sequences interspersed within the moraines on the southern apron of Lake Tennyson. Some of these near the southern lake shore are superimposed on finely-laminated glaciolacustrine sediments (with embedded drop stones) that indicate an ice-proximal and post-glacial lacustrine history is recorded in Lake Tennyson. The extent and thickness of these glacial sediments is unclear, though there may be opportunities to create a ‘patchwork’ of onshore-offshore records to reconstruct climate and environmental change since the end of the last ice age more comprehensively at Lake Tennyson. That effort would usefully link with burgeoning cosmogenic exposure age data from the site (Woolley 2016; Stuthridge 2022) and help refine our understanding of how glaciers in this catchment have changed through time.