Depositional Environments and History of Late Quaternary Sediments in Hudson Strait and Ungava Bay: Further Evidence from Seismic and Biostratigraphic Data
Regional ship-borne investigations of seafloor sediments provide further information on late Quaternary depositional environments and history in the Hudson Strait-Ungava Bay region. Greatest sediment thicknesses, up to 130 m, occur in the large basin in eastern Hudson Strait and in the western Hudso...
| Published in: | Géographie physique et Quaternaire |
|---|---|
| Main Authors: | , , |
| Format: | Text |
| Language: | English |
| Published: |
Les Presses de l'Université de Montréal
1992
|
| Subjects: | |
| Online Access: | http://id.erudit.org/iderudit/032917ar https://doi.org/10.7202/032917ar |
| Summary: | Regional ship-borne investigations of seafloor sediments provide further information on late Quaternary depositional environments and history in the Hudson Strait-Ungava Bay region. Greatest sediment thicknesses, up to 130 m, occur in the large basin in eastern Hudson Strait and in the western Hudson Strait basin north of Charles Island. Significant deposits are also present in basins southwest of Charles Island, along the south central part of the Strait, and in the southern part of Ungava Bay. Glacial drift deposits are widespread, but glaciomarine and postglacial sediments mainly occur in the basinal areas, with glaciomarine sediments generally predominating. Glaciomarine sediments are laterally transitional to glacial drift in the south central part of the Strait, and at many other basin margins. AMS dating of the deepest shells found within three cores from the glaciomarine sequences in the Wakeham Bay-Baie Héricart region of south central Hudson Strait yielded ages of 8390 ± 70,8420 ± 80, and 8520 ± 80 BP. Sequences underlying the dated intervals may contain time equivalents of glaciomarine sediments 1000-2000 years older found onshore in the Deception Bay area by Gray, Bruneau, and others. Les recherches menées par bateau à l'échelle régionale sur les sédiments des fonds marins ont augmenté les connaissances sur la sédimentologie et les milieux de sédimentation du Quaternaire supérieur dans la région du détroit d'Hudson et de la baie d'Ungava. Les plus grandes épaisseurs de sédiments (jusqu'à 130 m) se trouvent dans le grand bassin à l'est et dans celui à l'ouest, au nord de Charles Island, du détroit d'Hudson. D'importants dépôts se trouvent aussi dans des bassins au sud-ouest de Charles Island, Ie long du centre sud du détroit et dans la partie sud de la baie d'Ungava. Les dépôts glaciaires sont répandus, mais les sédiments glaciomarins et postglaciaires sont surtout concentrés dans les bassins où les sédiments glaciomarins prédominent. Il y a transition latérale des sédiments glaciomarins aux dépôts ... |
|---|