Postglacial uplift in North America

Farrand, William R.

doi:10.2475/ajs.260.3.181

Cited by 77 publications

(50 citation statements)

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“…Quaternary studies north of Lake Superior have concentrated on surficial mapping and glacial lake studies (Farrand, 1962;Zoltai, 1965aZoltai, , 1965bZoltai, , 1967Boissonneau, 1966;Grant, 1969) ; Zoltai and Boissonneau recognized the carbonate-rich till, as did Sado (1975). Coker and Shilts (1979) generally described the till in a lake geochemistry study, and Fortescue and Geddes (1983), Geddes (1984Geddes ( ,1986, Kristjansson (1984Kristjansson ( , 1986, Geddes andBajc (1985a, 1985b), Geddes et al (1985), Woods (1985), Geddes and Kristjansson (1986), White (1986), Hicock (1986Hicock ( , 1987bHicock ( , 1987c, Kristjansson and Thorleifson (1987), Kristjansson et al (in press), and Thorleifson and Kristjansson (1988) have described it in more detail.…”

Section: Physical Setting and Previous Workmentioning

confidence: 99%

Calcareous Till Facies North of Lake Superior, Ontario: Implications for Laurentide Ice Streaming

Hicock¹

2007

gpq

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ABSTRACTIn the Geraldton and Hemlo areas distantly-derived carbonate tills lie between slightly to non-calcareous tills and can be distinguished by textural, carbonate, and clast compositions. Their occurrence and uniform character over large areas of the Shield attest to high sediment flux by rapid movement of distal debris within the southern part of the Laurentide Ice Sheet. This is consistent with low surface profiles reconstructed for the Superior and Michigan lobes which were likely fed by ice north of Superior and probably affected by ice streaming. Till deposition in the Geraldton and Hemlo areas can be explained with one southwestward glacial advance. A broad ice stream probably issued out of James Bay and up the Albany conduit between zones of normal ice velocity within the Laurentide marginal area. It may have split to flow down the Drowning and Kenogami troughs. Eventually, zones of ice streaming reached the Geraldton and Hemlo areas where Shield uplands induced lee side extending flow, downward transport, and lodgment of calcareous englacial debris on local tills. Following the glacial maximum much of the distal englacial debris was laid down by subglacial meltout. However, a glacial reactivation occurred which moulded drumlins in the carbonate tills near Geraldton and deposited an upper calcareous lodgment till at Hemlo. Final Laurentide decay resulted in meltout of supraglacial debris that had been sheared up to or near the glacier surface from the stoss sides of the uplands.

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Section: Physical Setting and Previous Workmentioning

confidence: 99%

Calcareous Till Facies North of Lake Superior, Ontario: Implications for Laurentide Ice Streaming

Hicock¹

2007

gpq

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“…Early compilations of dated SLIs for Canada, including the northeastern USA, were provided by Farrand (1962), Walcott (1972) and others. On the supposition that the RSL height varies gradually with location, the SLIs were grouped into regions ( Figure 7) and RSL diagrams constructed for each region (see Figure 8 for Churchill).…”

Section: Hudson Bay Regionmentioning

confidence: 99%

A Reanalysis and Reinterpretation of Geodetic and Geological Evidence of Glacial-Isostatic Adjustment in the Churchill Region, Hudson Bay

et al. 2006

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Abstract. We review the historical, geological, tide-gauge, GPS and gravimetric evidence advanced in favour of, or against, continuing land uplift around Hudson Bay, Canada. We also reanalyse the tide-gauge and GPS data for Churchill using longer time series than those available to previous investigators. The dependence of the mean rate of relative sea-level change obtained from the tide-gauge record on the length and mid-epoch of the observation interval considered is investigated by means of a newly developed linear-trend analysis diagram. For studying the shorter-period variability of the tide-gauge record, the wavelet transform is used. The mean rate of land uplift obtained from GPS is based on a new analysis using IGS solutions of

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“…Furthermore, it could be argued that the effects of past climate changes may facilitate the mountain uplift, thus resulting in the high concavity and steepness indices in the Puqu Fault region because of the post-glacial rebound effect related to the retreat of existed glaciers. However, although the theory of the post-glacial rebound is proven to be true and was verified by some studies in Europe and North America several decades ago (e.g., [55,56]), such argument in the Tibet Plateau remains to be further investigated. Although some studies proposed the hypothesis of "ice sheet" suggesting that the former ice sheet may result in the glacial uplift in the Tibet Plateau [57], it is contradictory to the new findings that the Tibet Plateau is a young plateau rather than an ice covered plateau [58].…”

Section: Potential Effects Of Glaciationsmentioning

confidence: 99%

Active Tectonics Revealed by River Profiles along the Puqu Fault

Lü

Shang

2015

Water

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Abstract:The Puqu Fault is situated in Southern Tibet. It is influenced by the eastward extrusion of Northern Tibet and carries the clockwise rotation followed by the southward extrusion. Thus, the Puqu Fault is bounded by the principal dynamic zones and the tectonic evolution remains active alongside. This study intends to understand the tectonic activity in the Puqu Fault Region from the river profiles obtained from the remotely sensed satellite imagery. A medium resolution Digital Elevation Model (DEM, 20 m) was generated from an Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) stereo pair of images and the stream network in this region was extracted from this DEM. The indices of slope and drainage area were subsequently calculated from this ASTER DEM. Based on the stream power law, the area-slope plots of the streams were delineated to derive the indices of channel concavity and steepness, which are closely related to tectonic activity. The results show the active tectonics varying significantly along the Puqu Fault, although the potential influence of glaciations may exist. These results are expected to be useful for a better understanding of tectonic evolution in Southeastern Tibet.

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Postglacial uplift in North America

Cited by 77 publications

References 0 publications

Calcareous Till Facies North of Lake Superior, Ontario: Implications for Laurentide Ice Streaming

Calcareous Till Facies North of Lake Superior, Ontario: Implications for Laurentide Ice Streaming

A Reanalysis and Reinterpretation of Geodetic and Geological Evidence of Glacial-Isostatic Adjustment in the Churchill Region, Hudson Bay

Active Tectonics Revealed by River Profiles along the Puqu Fault

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