Silurian stratigraphy of the Hudson Bay Lowland in Quebec

1986 ◽  
Vol 23 (3) ◽  
pp. 288-299 ◽  
Author(s):  
Sven Y. Larsson ◽  
Colin W. Stearn
Keyword(s):  
Drainage Basin ◽  
Hudson Bay ◽  
Storm Events ◽  
Benthic Assemblages ◽  
Coral Fauna ◽  
Nodular Limestone ◽  
Shallow Subtidal ◽  
Hudson Bay Lowland

Carbonates of late Llandoverian to Ludlovian age, divided into the Severn River, Ekwan River, and Kenogami River formations, crop out in the drainage basin of the Harricana River. The Severn River Formation consists of a succession of alternating wackestone and packstone beds 17.5 m thick. The packstones are ascribed to storm events and carry a deeper water fauna than the wackestones. The Ekwan River Formation is divided into four units: a barren dolostone at the base, sandy wackestones and packstones with a coral fauna, another barren dolomudstone, and at the top a unit of argillaceous, nodular limestone rich in leperditid ostracods. The units are ascribed to shallow subtidal, intertidal, and supratidal environments. Three benthic assemblages, characterized by ostracods, corals, rhynchonellids, and the brachiopods Brachyprion and Dalejina, are distinguished in order of increasing depth. Two transgressive events in Llandoverian C4 and C6 times are marked by coral-rich units in the Severn River and Ekwan River formations.

MACROFOSSIL AND BIOMARKER RECORD FROM HUDSON BAY LOWLAND SOUTH RIDGE HOLLOW BOG, NORTHEAST ONTARIO

2016 ◽  
Author(s):  
Rebecca Snyder ◽  
◽  
Dorothy Peteet ◽  
Jonathan Nichols ◽  
Sarah Finkelstein ◽  
...  
Keyword(s):  
Hudson Bay ◽  
Hudson Bay Lowland

scholarly journals Evidence from 40Ar/39Ar Ages for a Churchill province source of ice-rafted amphiboles in Heinrich layer 2

1996 ◽  
Vol 42 (142) ◽  
pp. 440-446 ◽  
Author(s):  
Roberto H. Gwiazda ◽  
Sidney R. Hemming ◽  
Wallace S. Broecker ◽  
Tullis Onsttot ◽  
Chris Mueller
Keyword(s):  
North Atlantic ◽  
Drainage Basin ◽  
Ice Sheets ◽  
Bimodal Distribution ◽  
Laurentide Ice Sheet ◽  
Hudson Bay ◽  
Glacial Sediment ◽  
The North ◽  
Layer 2 ◽  
Eastern North Atlantic

Abstract40Ar/39Ar ages of most single ice-ratted amphiboles from Heinrich layer 2 (H2) from a core in the Labrador Sea, a core in the eastern North Atlantic and a core in the western North Atlantic range from 1600 to 2000 Ma. This range is identical to that for K/Ar ages from the Churchill province of the Canadian Shield that outcrops at Hudson Strait and forms the basement of the northern part of Hudson Bay. The ambient glacial sediment includes some younger and older grains derived from Paleozoic, Mesoproterozoic and Archean sources, but still the majority of the amphiboles have ages in the 1600–2000 Ma interval. The Ca/K ratios of these 1600–2000 Ma old amphiboles, however, have a bimodal distribution in contrast with the uniformity of the Ca/K ratios of H2 amphiboles. This indicates that 1600–2000 Ma old amphiboles of the ambient sediment were derived from an additional Early Proterozoic source besides Churchill province. In H2, Churchill-derived grains constitute 20–40% of the ice-rafted debris (IRD). The fraction in the ambient glacial sediment is 65–80%. Results presented here are consistent with the hypothesis that Heinrich events were produced by a sudden intensification of the iceberg discharge through Hudson Strait that mixed, in the North Atlantic, with icebergs that continued to calve from other ice sheets. The shift from mixed sources in the background sediment to a large dominance of Churchill province grains in H2 indicates that, even if calving of other ice sheets intensified during the Heinrich episode, the increase in the iceberg discharge via Hudson Strait from the Hudson Bay drainage basin of the Laurentide ice sheet was by far the largest.

Analysis of Multi-Temporal ERS-1 SAR Data of Subarctic Tundra and Forest in the Northern Hudson Bay Lowland and Implications for Climate Studies

1999 ◽  
Vol 25 (1) ◽  
pp. 21-33 ◽  
Author(s):  
C.K. Duguay ◽  
W.R. Rouse ◽  
P.M. Lafleur ◽  
L.D. Boudreau ◽  
Y. Crevier ◽  
...  
Keyword(s):  
Hudson Bay ◽  
Multi Temporal ◽  
Hudson Bay Lowland ◽  
Sar Data ◽  
Climate Studies
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