scholarly journals Exhuming the Canadian Shield: preliminary interpretations from low-temperature thermochronology and significance for the sedimentary succession of the Hudson Bay Basin

2021 ◽  
Author(s):  
Kalin McDannell ◽  
Nicolas Pinet ◽  
Dale Issler
Keyword(s):  
Low Temperature ◽  
Canadian Shield ◽  
Hudson Bay ◽  
Sedimentary Succession

The Resistance of Cultured Young Chum and Sockeye Salmon to Temperatures Below 0 °C.

1958 ◽  
Vol 15 (5) ◽  
pp. 805-813 ◽  
Author(s):  
J. R. Brett ◽  
D. F. Alderdice
Keyword(s):  
Low Temperature ◽  
Sockeye Salmon ◽  
Aqueous Humour ◽  
Pacific Salmon ◽  
Temperature Tolerance ◽  
Hudson Bay ◽  
Lethal Temperature ◽  
Low Temperature Tolerance

Recent efforts to establish Pacific salmon in Hudson Bay posed the question of low temperature tolerance in these species. A series of lethal temperature tests at −0.5, −1.0 and −1.5 °C. demonstrated that resistance to temperatures slightly below 0 °C. was limited. Freezing of the blood and aqueous humour occurred at temperatures of −1.0 and −1.5 °C.

Hudson Strait Platform and Basins Tectono-Sedimentary Element, Northeast Canada

2021 ◽  
pp. M57-2016-28
Author(s):  
Nicolas Pinet ◽  
Denis Lavoie ◽  
Shunxin Zhang
Keyword(s):  
Source Rocks ◽  
Hudson Bay ◽  
Upper Ordovician ◽  
Reservoir Rocks ◽  
Potential Reservoir ◽  
Half Graben ◽  
Topographical Feature ◽  
Sedimentary Succession ◽  
Marine Seismic ◽  
The One

AbstractThe Hudson Strait Platform and basins Tectono-Sedimentary Element (HSPB TSE) is part of a major topographical feature that connects Hudson Bay and Foxe Basin with the Labrador Sea in the Canadian Arctic. The Paleozoic succession (Ordovician–Silurian) unconformably overlies the Precambrian basement and reaches a maximum preserved thickness of less than 600 m on the islands. High-resolution marine seismic data indicate that the offshore part of the Hudson Strait is underlain by several fault-controlled sub-basins with a half-graben geometry. The sedimentary succession in the sub-basins is thicker than the one preserved in nearby islands, and includes an upper sedimentary package for which the nature and age remain poorly constrained. Upper Ordovician source rocks have been mapped onshore. Known potential reservoir rocks consist of Ordovician clastics and Ordovician–Silurian reefs and dolostones.

Benthic Communities in Five Major Rivers of the Hudson Bay Lowland, Canada

1986 ◽  
Vol 21 (2) ◽  
pp. 235-250 ◽  
Author(s):  
D. Campbell ◽  
R. Kwiatkowski ◽  
R.C. McCrea
Keyword(s):  
Benthic Communities ◽  
Canadian Shield ◽  
The Other ◽  
Hudson Bay ◽  
Community Similarity ◽  
Drainage Basins ◽  
Lowland Rivers ◽  
Hudson Bay Lowland ◽  
Flow Directions ◽  
Moose River

Abstract A total of one hundred and twenty six species of macroinvertebrates were collected from five major Ontario rivers (Moose, Albany, Attawapiskat, Winisk and Severn) of the Hudson Bay Lowland. Benthic communities in all rivers were dominated primarily by chironomids and oligochaetes except in the East channel of the Moose River where gastropods were also a common taxon. Diversity, as measured by both species richness and the Shannon-Weiner index, was not significantly different in each river. Species distribution was related to substrate composition, river velocity and depth at each station. Community similarity analysis showed that rivers geographically closest together, sharing common flow directions and similar drainage basins resembled each other most in terms of benthic communities. The exception to this was the East channel of the Moose River which showed little resemblance to the other Lowland rivers studies. This was attributed to the highly channelized nature of the Moose River and the origin of the East channel itself which is fed by waters draining the Clay Belt, a unique subprovince of the Canadian shield.

A comparative 40Ar/39Ar study of the Kapuskasing structural zone and the Wawa gneiss terrane: thermal and tectonic implications

1990 ◽  
Vol 27 (6) ◽  
pp. 787-793 ◽  
Author(s):  
Margarita Lopez Martinez ◽  
Derek York
Keyword(s):  
Low Temperature ◽  
Northern Region ◽  
Canadian Shield ◽  
Southern Region ◽  
Closure Temperature ◽  
Superior Province ◽  
Tectonic Implications ◽  
Differential Uplift ◽  
Alkaline Complexes

40Ar/39Ar studies were performed on rocks from two traverses within the southern Superior Province of the Canadian Shield: the Racine traverse across the Wawa gneiss terrane and the Shawmere traverse in the highest grade rocks of the Kapuskasing structural zone (KSZ). Evidence of differential uplift between the two regions was obtained from the hornblende samples analysed. The results suggest that the Wawa gneiss terrane cooled below the hornblende closure temperature about 2570 Ma ago, whereas the KSZ region remained at depth, above the hornblende closure temperature, until about 2450 Ma ago. The Racine biotite samples indicate earlier cooling for the northern region in respect to the southern region within the Wawa gneiss terrane. This would imply tilting in a roughly north-south direction about 2300 Ma ago. Low ages (ca. 1100 Ma) obtained in low-temperature fractions of the microcline samples record the intrusion of the alkaline complexes.

High horizontal stresses in Hudson Bay, Canada

1997 ◽  
Vol 34 (7) ◽  
pp. 949-957 ◽  
Author(s):  
J. S. Bell ◽  
P. Wu
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Horizontal Stress ◽  
Crystalline Basement ◽  
Canadian Shield ◽  
Hudson Bay ◽  
Element Modelling ◽  
Central Canada ◽  
Stress Orientations ◽  
Mid Atlantic Ridge

Breakouts in four wells in Hudson Bay suggest that the Paleozoic section is currently subject to maximum horizontal compression about a northeast–southwest axis, with some local deflection in horizontal stress orientations related to faults. The Paleozoic section does not appear to be detached from the crystalline basement of the Canadian Shield, despite the presence of thick Silurian halite-rich intervals. The northeast–southwest compressional axis documented in the Hudson Bay Basin is compatible with stress orientations mat have been measured in other parts of cratonic North America. Leak-off tests from three wells imply that contemporary horizontal stress magnitudes above 1500 m depth exceed present-day overburden loads; comparable relative magnitudes have been measured elsewhere in central Canada. Finite-element modelling suggests mat this phenomenon is due to the effects of glacial loading, crustal rebound, and spreading of the Mid-Atlantic Ridge.

Paleomagnetism of the Circum-Ungava Proterozoic Fold Belt (I): Cape Smith Komatiitic Basalts

1975 ◽  
Vol 12 (10) ◽  
pp. 1785-1793 ◽  
Author(s):  
Y. Fujiwara ◽  
E. J. Schwarz
Keyword(s):  
North American ◽  
Pole Position ◽  
Canadian Shield ◽  
Lower Portion ◽  
Hudson Bay ◽  
General Area ◽  
Fold Belt ◽  
Early Proterozoic ◽  
Form Part ◽  
North American Data

A total of 397 oriented cores were taken from pillowed, columnar, and massive basalt of Cape Smith Island in northeastern Hudson Bay and from the adjacent mainland coast of Quebec. The thick series of basalts form part of the Circum-Ungava Proterozoic Belt which is of Aphebian (early Proterozoic) age. The lower portion of the basalt series contains pyrrhotite (Fe7S8) and did not yield useful paleomagnetic results. The magnetization of the upper portion of the series is carried by small quantities [Formula: see text] of magnetite. The directions of magnetization of the samples do not change much during alternating field and thermal washing, and show very good grouping. The available internal evidence on the age of the stable remanence is inconclusive. The pole position (20°N, 162°E, semi-axes of the 95% oval of confidence: 4 °and 5°) after correcting for tilt is about 70° west of the preHudsonian part of the polar wandering curve established from North American data. The uncorrected pole position (16°N, 107°W), which would apply if the magnetization was acquired at the time of the Hudsonian orogeny, is in the general area of paleomagnetic poles for rocks of similar age from other localities of the Canadian Shield.

Community structure of zooplankton in eastern Hudson Bay

1988 ◽  
Vol 66 (7) ◽  
pp. 1626-1630 ◽  
Author(s):  
Martine Rochet ◽  
E. H. Grainger
Keyword(s):  
Low Temperature ◽  
High Salinity ◽  
The Arctic ◽  
Hudson Bay ◽  
James Bay ◽  
Near Surface ◽  
Geographical Regions ◽  
Moderate Salinity ◽  
Faunal Element ◽  
Arctic Fauna

Twenty-five zooplankton stations in eastern Hudson Bay were grouped into four geographical regions on the basis of salinity and temperature. One region, of high salinity and low temperature in deep water, showed a preponderance of arctic zooplankton. The second, with moderate salinity, low temperature, and shallow depths, supported mainly meroplanktonic larvae. The third, less saline and warmer in the upper levels, supported a euryhaline fauna, and the shallower fourth region sustained a fauna with still wider salinity tolerance. Strong pycnocline development supported a near-surface euryhaline fauna below which the arctic faunal element was concentrated in deeper water. Less stratified water, where pycnocline development was slight or absent, inhibited establishment of a euryhaline fauna and permitted a greater near-surface presence of the arctic zooplankton. The major zoogeographic element in eastern Hudson Bay, and probably in most of the bay, is arctic, reflecting the continuity of this area with the primarily arctic waters of the Canadian archipelago and the surface of the Arctic Ocean. Carried cyclonically around the bay, the arctic fauna penetrates the eastern sector, especially north of the Belcher Islands. The euryhaline fauna indicates the influence of James Bay, mainly in the southeastern extremity of the bay.

Carbonate till as a soft bed for Pleistocene ice streams on the Canadian Shield north of Lake Superior

1989 ◽  
Vol 26 (11) ◽  
pp. 2249-2254 ◽  
Author(s):  
Stephen R. Hicock ◽  
Fridrik J. Kristjansson ◽  
David R. Sharpe
Keyword(s):  
Thickness Distribution ◽  
Lake Superior ◽  
Canadian Shield ◽  
Shear Stresses ◽  
Hudson Bay ◽  
Ice Streams ◽  
Dispersal Patterns ◽  
Long Distance ◽  
Ice Flow ◽  
Basal Shear

Silty carbonate till derived from erosion of Paleozoic carbonate and Proterozoic rocks within and adjacent to Hudson Bay covers extensive areas of the Canadian Shield north of Lake Superior. It is hypothesized that this carbonate till could have acted as low-resistance substrata for overriding ice streams by deforming and (or) supporting high subglacial water pressures. Contrary to assumptions presented in some current models for ice flow within the Laurentide Ice Sheet, it need not be assumed that Shield terrain in these areas acted as a rigid bed, generating large basal shear stresses and inhibiting ice flow. Indeed, erratic-dispersal patterns, long-distance glacial transport, and splayed patterns of ice-flow indicators in areas of thick till cover may be better explained by rapid ice-flow events or ice streams, enhanced by the thickness, distribution, impermeability, and susceptibility to deformation of fine carbonate till.

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