Evidence of a continent-wide fault system on the Attawapiskat River, Hudson Bay Platform, northern Ontario

1993 ◽  
Vol 30 (8) ◽  
pp. 1668-1673 ◽  
Author(s):  
Daniel R. Suchy ◽  
Colin W. Stearn
Keyword(s):  
Landsat Imagery ◽  
Aerial Photographs ◽  
Fault System ◽  
Reef Crest ◽  
Hudson Bay ◽  
James Bay ◽  
Northern Ontario ◽  
Lower Silurian

The grouping of areas of outcrop of Lower Silurian reefs along a stretch of the Attawapiskat River west of James Bay (northern Ontario, Canada) is controlled by a conjugate set of faults striking approximately 60 and 280°. The faults are evident in disturbed outcrops along the river and in subtle lineaments revealed in aerial photographs and Landsat imagery in the surrounding marshland topography. Slumping of large blocks from a reef crest in Silurian time and stratigraphic relationships within the Hudson Basin indicate a major episode of movement in late Llandovery time. Movements on the fault set have been traced back to Proterozoic time and, to affect the present subdued topography recently emerged from marine inundation, must have been renewed in rapid recent postglacial uplift of this area.

Post-glacial uplift and substrate age at Cape Henrietta Maria, southeastern Hudson Bay, Canada

1970 ◽  
Vol 7 (2) ◽  
pp. 317-325 ◽  
Author(s):  
P. J. Webber ◽  
J. W. Richardson ◽  
J. T. Andrews
Keyword(s):  
Polar Bear ◽  
Hudson Bay ◽  
James Bay ◽  
Northern Ontario ◽  
Sea Levels ◽  
Biological Studies ◽  
History Of ◽  
Emergence Curve ◽  
Reasonable Prediction ◽  
Substrate Age

As a basis for future ecological and biogeographical studies, the post-glacial emergence history of Cape Henrietta Maria was required. This was obtained by fitting a post-glacial emergence curve to a number of radiocarbon dated marine strandlines of known elevation. Analysis shows that the elevation of lower samples is critical for a reasonable prediction of higher relative sea levels. This emergence curve suggests that during the last 1000 y uplift has been about 1.2 m per century. Extrapolation to likely dates of deglaciation (8000−7000 BP) indicates a maximum marine inundation of > 300 m. The current rate of uplift, and the hypothetical elevation of the marine limit are the highest estimations to date for eastern and arctic Canada and support the hypothesis that a center of uplift and ice-loading is situated in southeastern Hudson Bay and northern James Bay. The derived emergence curve was used to construct an isochrone map of Polar Bear Park, in eastern northern Ontario. This map provides the basis for future biological studies of community migration and succession and demonstrates that the uplift curve is a useful chronological tool.

scholarly journals Observations sur l’influence hydrologique de la neige dans l’Est du Canada

2005 ◽  
Vol 2 (3) ◽  
pp. 75-86
Author(s):  
Christian Mingasson
Keyword(s):  
General Rule ◽  
Hudson Bay ◽  
James Bay ◽  
Maritime Provinces ◽  
Northern Ontario ◽  
Run Off ◽  
Northern Regions ◽  
Total Discharge ◽  
Flooding Period

This article deals with a group of 27 rivers all situated East of the 85 th meridian and South of Hudson Bay. In the first place, the author bas calculated the ratios of snow run-off during the springtime discharge. In the Maritime Provinces, the ratio obtained is only 20% of the total discharge (with a minimum of 17%) because of the rainy marine characteristics of the climate. In the Laurentian region, the ratio is close to 30% (maximum 35%) because of abundant snow precipitations and quite low summer discharge. One must note the retentional influence of lakes which display the flooding period jar beyond springtime and lower the spring ratio down to 23%. For instance, in Northern Ontario, due to losses in the marshy zones, the author bas found a ratio of only 19%. A second problem raised in this paper is the dating of the beginning of floods caused by the melting of snow. In the Southern parts of the Maritime provinces and of Ontario, the waters are high on April 5 th. In the Southern and Central parts of Québec, the flooding period begins between the 6 th and the 20 th of April. In the regions situated North of the St. Lawrence and South of James Bay, the flooding period usually begins after the 25 th of April. So the flooding period caused by the melting of snow happens later in the Northern regions. Finally, the author considers the monthly ratios of discharge during the month that knows the highest waters. Those ratios are between 2 and 3 (maximum 4.64) but they can lower down to 1.50 due to retention operated by the lakes. The month of maximum flooding extends from March, in the Southern parts of the zone covered by this study, to June, in the Northern parts. As a general rule, the figures found in this article are lower than those recorded for the rivers of the U.S.S.R.

Morphological and isozyme variation in Salicornia europaea (s.l.) (Chenopodiaceae) in northeastern North America

1987 ◽  
Vol 65 (7) ◽  
pp. 1410-1419 ◽  
Author(s):  
S. L. Wolff ◽  
R. L. Jefferies
Keyword(s):  
North America ◽  
Atlantic Coast ◽  
Hudson Bay ◽  
Salicornia Europaea ◽  
Electrophoretic Variation ◽  
James Bay ◽  
Northeastern North America ◽  
Electrophoretic Patterns ◽  
Anther Length ◽  
Vegetative Characters

Morphological and electrophoretic variation has been documented within and among populations of Salicornia europaea L. (s.l.) in northeastern North America. Univariate and multivariate analyses (discriminant analyses) of measurements of floral and vegetative characters delimited three morphologically distinct groups of populations: Atlantic coast tetraploids (2n = 36), Hudson Bay diploids, and Atlantic coast and James Bay diploids (2n = 18). The two diploid groups were morphologically distinct from the midwestern diploid, S. rubra Nels., based on anther length, width of the scarious border of the fertile segment, and the overall width of the fertile segment. Electrophoretic evidence supported the delimitation of the three distinct morphological groups of populations of S. europaea with the exception of the population from James Bay, which had electrophoretic patterns identical with those of plants from Hudson Bay but resembled the Atlantic coast diploids morphologically. Most enzyme systems assayed were monomorphic. Only homozygous banding patterns were detected in diploid plants and electrophoretic variation was not observed within populations of S. europaea or S. rubra but was detected between groups of populations. Four multilocus phenotypes were evident; these corresponded to the major groups recognized on the basis of ploidy level and morphology. Reasons that may account for the paucity of isozymic variation are discussed.

Foxe Platform and Basin Tectono-Sedimentary Element

2021 ◽  
pp. M57-2016-27
Author(s):  
Denis Lavoie ◽  
Nicolas Pinet ◽  
Shunxin Zhang
Keyword(s):  
Black Shales ◽  
Coarse Grained ◽  
Hudson Bay ◽  
Precambrian Basement ◽  
Upper Ordovician ◽  
Lower Paleozoic ◽  
Lower Silurian ◽  
The North ◽  
Marine Carbonate ◽  
Single Well

AbstractThe Foxe Platform and Basin Tectono-Sedimentary Element is an ovoid-shaped, predominantly marine basin located in the Canadian Arctic. The Paleozoic sedimentary succession (Cambrian to Silurian) unconformably overlies the Precambrian basement and reaches a maximum measured thickness of slightly over 500 metres in the only exploration well drilled in this basin. The Lower Paleozoic Foxe Platform and Basin Tectono-Sedimentary Element is surrounded by Precambrian basement and by the Paleozoic Arctic Platform to the north and by the Paleozoic-Mesozoic (?) Hudson Bay Strait Platform and Basin to the south. The Paleozoic succession consists of a Cambrian clastic-dominated interval overlain by Ordovician to lower Silurian predominantly shallow marine carbonate. Other than a single well drilled in the northern part of the basin, no subsurface information is available. Thermally immature Upper Ordovician organic matter rich calcareous black shales have been mapped on the onshore extension of the basin to the southeast. Potential hydrocarbon reservoirs consist of Cambrian porous coarse-grained clastics as well as Upper Ordovician dolostones and reefs.

BIOLOGICAL AND OCEANOGRAPHIC CONDITIONS IN HUDSON BAY: 6. THE GENERAL HYDROGRAPHY AND HYDRODYNAMICS OF THE WATERS OF THE HUDSON BAY REGION

1932 ◽  
Vol 7 (1) ◽  
pp. 91-118 ◽  
Author(s):  
H. B. HACHEY
Keyword(s):  
Fresh Water ◽  
Water Movement ◽  
Open Ocean ◽  
Hudson Bay ◽  
Water Drainage ◽  
James Bay ◽  
Bay Area ◽  
Hydrographic Conditions ◽  
The Many ◽  
Oceanographic Conditions

The waters of Hudson bay differ markedly from the waters of Hudson strait and the waters of the open ocean. Intense stratification in the upper twenty-five metres, decreasing as the waters of the open ocean are approached, gives Hudson bay the character of a large estuary. Below fifty metres the waters are for all purposes dynamically dead, thus resulting in a cold saline body of water which probably undergoes very little change from season to season. The movements of the waters at various levels are dealt with to show that the inflow of waters from Fox channel and the many fresh-water drainage areas control the hydrographic conditions as found. The main water movement is from the James bay area to Hudson strait and thence to the open ocean.

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