Ordovician rocks in the Eastcan et al. Freydis B-87 and other wells in offshore Atlantic Canada

1984 ◽  
Vol 21 (7) ◽  
pp. 864-868 ◽  
Author(s):  
W. A. M. Jenkins
Keyword(s):  
Late Ordovician ◽  
Atlantic Canada ◽  
Grand Banks ◽  
Exploratory Wells

Acritarchs and Chitinozoa from the lower 1300 ft (400 m) of the Eastcan et al. Freydis B-87 well, Labrador Shelf, indicate that these strata accumulated in a marine setting during Late Ordovician time. Five or more other exploratory wells on the Labrador Shelf and the Grand Banks of Newfoundland also have encountered Ordovician rocks.

Early Silurian paleopole for redbeds and volcanics of the King George IV Lake area, Newfoundland

1989 ◽  
Vol 26 (10) ◽  
pp. 1904-1917 ◽  
Author(s):  
K. L. Buchan ◽  
J. P. Hodych
Keyword(s):  
North America ◽  
Late Ordovician ◽  
Paleomagnetic Data ◽  
Atlantic Canada ◽  
Lake Area ◽  
Consistent Direction ◽  
Canadian Appalachians

Redbeds and felsic and mafic volcanics of the King George IV Lake area of the Dunnage Zone in southwestern Newfoundland have been studied paleomagnetically. After unfolding, both hematite and magnetite carry a consistent direction of magnetization (D = 29.6°; I = 1.0°; k = 19.3; α95 = 11.3°) corresponding to a near-equitorial paleolatitude (0.5°N ± 6°) and yielding a paleopole at 84.6°E, 35.9°N (dm = 11.3°; dp = 5.6°). A positive fold test shows that the remanence was acquired before Devonian deformation. A positive conglomerate test and a reversal of the magnetization in a continuous redbed sequence demonstrates that the remanence was acquired at the time of formation, which has been assigned to the Early Silurian on the basis of a U–Pb zircon date of 431 ± 5 Ma.No other undisputed primary or pre-fold remanence has been reported from Atlantic Canada for the Late Ordovician – Silurian period. Therefore, from paleomagnetic data it is not yet possible to estimate the amount of post-Silurian movement within the Canadian Appalachians. Pre-fold magnetizations from Late Ordovician and Silurian rocks of cratonic North America predict a paleolatitude of 16°S ± 12 °for Newfoundland. However, further results are necessary to determine whether any significant displacement has occurred between Newfoundland and the craton since the Early Silurian.

scholarly journals Pre-Wisconsin stratigraphy and paleoclimates off Atlantic Canada, and its bearing on glaciation in Québec

2010 ◽  
Vol 31 (1-2) ◽  
pp. 15-22 ◽  
Author(s):  
M. Alam ◽  
D. J. W. Piper
Keyword(s):  
Continental Shelf ◽  
Ice Sheet ◽  
Atlantic Canada ◽  
Shelf Edge ◽  
Glacial History ◽  
Grand Banks

Cores from tops of seamounts close to the continental shelf west of the Grand Banks contain sequences of alternating clays (representing glacials) and foram nanno ooze (deposited in warmer periods), back to the Pliocene. Although sedimentation in the cores is controlled primarily by glacial conditions on the Grand Banks and Laurentian Channel, glacial history further inland can be inferred. The Wisconsin sequence shows two cool interstadials and one rather warmer one, correlable with the Plum Point, Port Talbot and St. Pierre Interstadials. Clay sedimentation during Wisconsin glacial stages was minor, suggesting glaciers did not extend to the shelf edge. In the late lllinoian, there was a major influx of red sediments, indicating significant erosion of the Gulf of St. Lawrence and Laurentian Channel. Glaciation was more extensive than during the Wisconsin. Two lllinoian interstadials, with temperatures between those of the Plum Point and St. Pierre interstadials are recognised. Early lllinoian glaciation was the most severe yet recognised in the cores. Sedimentation appears to have been controlled by the advance of a Newfoundland — Labrador — E. Québec ice sheet across the Grand Banks.

Were Jurassic tholeiitic lavas originally widespread in southeastern Canada?: a test of the broad terrane hypothesis

1999 ◽  
Vol 36 (9) ◽  
pp. 1509-1516 ◽  
Author(s):  
Georgia Pe-Piper ◽  
David JW Piper
Keyword(s):  
Atlantic Canada ◽  
Large Area ◽  
Grand Banks ◽  
Type Section ◽  
The North ◽  
Geochemical Variations ◽  
Competing Models ◽  
Uplift And Erosion ◽  
Newark Basin ◽  
Fundy Basin

Two competing models have been proposed for Early Jurassic magmatism on the eastern North American margin. The "broad terrane" hypothesis argues that tholeiitic lavas were extruded over a large area and later eroded. Alternatively, the lavas were extruded only in the basins in which they now outcrop. We compare the stratigraphy and geochemistry of the tholeiitic lavas and dykes from Atlantic Canada with those of the type section of the Newark basin and use this correlation to test these two models. The earliest high-Ti quartz tholeiites in the type section are represented by lavas in the Fundy basin (North Mountain Basalt), Scotian basin, and eastern Grand Banks and by the Shelburne and Ministers Island dykes. Spatial and temporal geochemical variations in the North Mountain Basalt are mirrored by the Shelburne dyke, strengthening the case that the two were geochemically related. Basalts in Grand Manan Island, on the footwall of the Grand Manan fault that bounds the Fundy basin, are geochemically similar to the lowest North Mountain Basalt flow. These observations suggest that the earliest basalt flows were originally more extensive and have become restricted by later uplift and erosion. However, younger magmas in the Newark basin are represented only by the Caraquet, Anticosti, and Avalon dykes in Atlantic Canada, and corresponding lavas were never deposited in the Fundy basin or eastern Grand Banks. Thus, Jurassic tholeiitic lava distribution lies in between the predictions of the "broad terrane" and the "restricted basin" models.

scholarly journals Magnetic anomaly map, Grand Banks and surrounds, Atlantic Canada

2004 ◽  
Author(s):  
G N Oakey ◽  
S A Dehler
Keyword(s):  
Magnetic Anomaly ◽  
Atlantic Canada ◽  
Grand Banks ◽  
Anomaly Map

Inequity and Chronic Disease in Atlantic Canada - A Community Tool Kit

2004 ◽  
Author(s):  
Andrea Lebel ◽  
Karen Hayward ◽  
Ronald Colman ◽  
Andrea Lebel
Keyword(s):  
Chronic Disease ◽  
Atlantic Canada

Addressing the Impact of Social and Economic Exclusion in Atlantic Canada - Shared Learning Through Partnership

2004 ◽  
Author(s):  
Fiona Chin-Yee ◽  
Malcolm Shookner ◽  
Moyra Buchan
Keyword(s):  
Atlantic Canada ◽  
Shared Learning ◽  
Economic Exclusion ◽  
The Impact

Author response for "Middle to Late Ordovician carbon isotope chemostratigraphy of the Lower Yangtze Platform: Implications for global correlation"

2020 ◽  
Author(s):  
Fangyi Gong ◽  
Michael M. Joachimski ◽  
Guanzhou Yan ◽  
Lixia Li ◽  
Xin Wei ◽  
...  
Keyword(s):  
Carbon Isotope ◽  
Late Ordovician ◽  
Author Response ◽  
Yangtze Platform ◽  
Global Correlation ◽  
Lower Yangtze
Sign in / Sign up

Export Citation Format

Share Document