STRATIGRAPHY, DISTRIBUTION OF ACTIVE LAYER AND DISCONTINUOUS PERMAFROST IN KANGIQSUALU J JUAQ BASIN, NORTHERN QUEBEC
The hydrological basin is located to the southeast of Ungava Bay. This study is carried out to investigate the stratigraphy which is necessary for the understanding of the hydrological and thermal regimes of this basin. To establish the stratigraphic framework. surface geophysical surveys have been...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.552.3709 http://pubs.aina.ucalgary.ca/cpc/cpc5-181.pdf |
| Summary: | The hydrological basin is located to the southeast of Ungava Bay. This study is carried out to investigate the stratigraphy which is necessary for the understanding of the hydrological and thermal regimes of this basin. To establish the stratigraphic framework. surface geophysical surveys have been conducted. In addition, thermistor cables and piemmeters are installed at three sites in order to obtain the parameters required for the hydrological and thermal investigations. The geophysical results are calibrated with drill hole information. The results of a ground probing radar profile are correlated with those of electrical soundings. This integrated approach facilitates the interpretation of geophysical soundings on uncalibrated sites and allows a better understanding of the stratigraphic sequences in marine sediments. Detailed transect surveys are conducted across the basin. These surveys indicate that permafrost covers 40 % of the basin area Its thickness, determined from geophysical surveys, varies from 2 to 20 m (average 11 m). The average permafrost thickness is similar in sand and gravel, till. and clayey silt deposits. On the test sites, the thickness of permafrost obtained from geophysical interpretation is compared with the extrapolated temperature profiles measured along drill holes. In addition, the depth extent of permafrost is correlated with snow cover thickness. Isotemperature sections and geoelectrical pseudo-sections indicate that permafrost is colder in |
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