scholarly journals Hudson Bay, Sheet 44M/SW, District of Keewatin, Northwest Territories

1974 ◽  
Author(s):  
Keyword(s):  
Northwest Territories ◽  
Hudson Bay

Paleomagnetism of igneous rocks from the Belcher Islands, Northwest Territories, Canada

1980 ◽  
Vol 17 (7) ◽  
pp. 807-822 ◽  
Author(s):  
P. W. Schmidt
Keyword(s):  
North America ◽  
Northwest Territories ◽  
Igneous Rock ◽  
Pole Position ◽  
Igneous Rocks ◽  
Hudson Bay ◽  
Plate Model ◽  
Polar Wander ◽  
Apparent Polar Wander Path ◽  
Paleomagnetic Pole

Paleomagnetic results from igneous rock units on the Belcher Islands, Hudson Bay, are described. Fold tests for all units studied, as well as a contact test for the intrusive bodies, indicate that both primary (initial), and secondary (post-folding) magnetizations are present.The paleomagnetic pole position from primary directions of the oldest unit studied, the Eskimo volcanics, is situated at 40°S, 002°E (A95 = 12°) and is similar to that derived from equivalent volcanics on the mainland. The younger volcanic unit studied, the Flaherty volcanics, yielded a pole position from primary directions at 0°, 244°E (A95 = 7°). The Haig intrusions, associated with these younger volcanics, yields an almost identical pole position at 1°N, 247°E (A95 = 6°), being derived from directions which are shown to be not only pre–folding but also date from initial cooling. The Eskimo volcanics, which have been more deeply buried than the Flaherty (upper) volcanics, carry substantial components of secondary (post-folding) magnetization which yield a pole position at 19°N, 243°E (A95 = 15°), about 20° north of the pole positions derived from the youngest units.It is argued that the apparent polar wander path (APWP) constructed for the Belcher Islands is representative of the mainland Ungava Craton. Comparison with the equivalent APWP from elsewhere in North America shows that the two APWP's are at variance. Although a two-plate model could be advanced, perhaps a more conservative interpretation is to extend the existing North American APWP eastward to include the Belcher–Ungava APWP, that is, to favour a one-plate model.

Paleoproterozoic stromatolites, Hurwitz Group, Quartzite Lake area, Northwest Territories, Canada

1998 ◽  
Vol 35 (3) ◽  
pp. 280-289 ◽  
Author(s):  
H J Hofmann ◽  
A Davidson
Keyword(s):  
North America ◽  
Northwest Territories ◽  
Baltic Shield ◽  
Hudson Bay ◽  
Lake Area ◽  
Hutuo Group ◽  
The Baltic ◽  
Hurwitz Group

Decimetric to metric domal stromatolites with constituent ministromatolites characterize reddish, 13C-enriched dolostones in the Watterson Formation of the Quartzite Lake area west of Hudson Bay. They provide paleontologic support for a correlation with the only other known early Paleoproterozoic stromatolite occurrences in North America: the Kona Formation of Michigan, and the Nash Formation in southern Wyoming. They also are similar to stromatolites in probable coeval Jatulian carbonates in Karelia on the Baltic Shield, and possibly to stromatolites in the Hutuo Group in China.

scholarly journals Defining the Pen Islands Caribou Herd of southern Hudson Bay

Rangifer ◽  
1998 ◽  
Vol 18 (5) ◽  
pp. 33 ◽  
Author(s):  
Kenneth F. Abraham ◽  
John E. Thompson
Keyword(s):  
Boreal Forest ◽  
Northwest Territories ◽  
Hudson Bay ◽  
Critical Importance ◽  
Woodland Caribou ◽  
Barren Ground

In this paper, we describe the Pen Islands Herd of caribou, the largest aggregation of caribou in Ontario (it also occupies a portion of northeastern Manitoba). Photographic counts showed the herd had a minimum population of 2300 in 1979, 4660 in 1986, 7424 in 1987 and 10 798 in 1994. Throughout the 1980s, the Pen Islands caribou exhibited population behaviour similar to migratory barren-ground caribou herds, although morphology suggests they are woodland caribou or possibly a mixture of subspecies. The herd had well-defined traditional tundra calving grounds, formed nursery groups and large mobile post-calving aggregations, and migrated over 400 km between tundra summer habitats and boreal forest winter habitats. Its migration took it into three Canadian jurisdictions (Ontario, Manitoba, Northwest Territories) and it was important to residents of both Manitoba and Ontario. It is clear that the herd should be managed as a migratory herd and the critical importance of both the coastal and variable large winter ranges should be noted in ensuring the herd's habitat needs are secure.

Permafrost Features under Arctic Lakes, District of Keewatin, Northwest Territories

1975 ◽  
Vol 12 (4) ◽  
pp. 649-662 ◽  
Author(s):  
William W. Shilts ◽  
Walter E. Dean
Keyword(s):  
Northwest Territories ◽  
Shallow Lakes ◽  
Arctic Lakes ◽  
Hudson Bay ◽  
Frozen Ground ◽  
Maximum Thickness ◽  
Sandy Silt ◽  
Average Maximum ◽  
Water Depths ◽  
Lake Basins

In the District of Keewatin, west of Hudson Bay, numerous shallow lakes occupy depressions on the perennially frozen, glaciated terrain north of the treeline. Many lakes in the vicinity of Kaminak Lake have extensive shallow areas that are characterized by features of probable periglacial origin. Some features, such as polygonal patterns, frost-heaved boulders, and mudboils, are similar to those of the subaerial landscape.Digitate, cobble-covered ribs and boulder-filled troughs that commonly form a crenulate pattern on the shallow shelves adjacent to till-covered shores are thought to be the subaqueous equivalents of mudboils that are common on the adjacent till plains. They are composed of till and are underlain by an undulating frost surface that is raised beneath troughs and depressed under ribs.Holes with or without raised rims often occur singly or in clusters on loose, sandy silt bottoms in water depths less than 2.5 m. A frost table underlies the bottoms of these holes at depths of 30 to 50 cm in early August. Holes may be either sites of strudel scour or sites of final points of attachment of winter ice to the frost table, just before the buoyancy of the ice caused it to break free from the bottom in the spring, extracting frozen sediment from the surrounding unfrozen sediment, leaving a hole.The features described are restricted to water depths that are probably equivalent to the average maximum thickness of winter ice. Thus, they represent areas where the lake is seasonally frozen to the bottom, and may be restricted to portions of lake basins underlain by perennially frozen ground.

Tintinnids of Chesterfield Inlet, Northwest Territories

1981 ◽  
Vol 59 (12) ◽  
pp. 2360-2364 ◽  
Author(s):  
G. F. Rogers ◽  
J. C. Roff ◽  
D. H. Lynn
Keyword(s):  
Northwest Territories ◽  
New Records ◽  
Abundant Species ◽  
Hudson Bay ◽  
Marine Waters ◽  
Cell Numbers ◽  
Bay Area ◽  
Marine Influence ◽  
Middle Estuary

Tintinnids were numerically dominant in plankton samples collected from Chesterfield Inlet, Northwest Territories, in September 1978. Thirteen species were identified, 11 of which are new records for the Hudson Bay area. Tintinnopsis fimbriata and T. angusta were the most numerous tintinnids in the upper estuary at salinities below 24‰; their cell numbers were significantly positively correlated to temperature. Parafavella denticulata was the most abundant species in marine waters but it penetrated the estuary to salinities as low as 4‰. Cell numbers and volumes of P. denticulata were significantly positively correlated to salinity and negatively to chlorophyll; this species appeared to act as an almost conservative indicator of marine influence in this estuary. The distributions of the two Tintinnopsis species were not so readily explained, but maximum numbers of T. fimbriata and T. angusta corresponded to a phytoplankton maximum at station 29 in the middle estuary.

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