Hudson Bay Basin
V. Dimian, R. Gray, J. Stout, B. Wood, 1983. "Hudson Bay Basin", Seismic Expression of Structural Styles: A Picture and Work Atlas. Volume 1–The Layered Earth, Volume 2–Tectonics Of Extensional Provinces, & Volume 3–Tectonics Of Compressional Provinces, A. W. Bally
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The Hudson Bay basin is a cratonic basin situated in the central part of the Canadian Shield. Its basement is composed of crystalline rocks belonging to the Superior Province (2.9 Ga) in the southern and central part and to the Churchill Province (1.6 to 1.9 Ga) in the northern part. The eastern part of the basement of the basin has been affected by the Hudsonian Crogeny.
The Hudson Bay basin is filled with Paleozoic sediments with a thickness of at least 1,576 m (5,170 ft) proven by drilling in the central part of the basin. The subsidence and sedimentation rates were moderate with several periods of uplift and erosion during the Paleozoic. The Mesozoic is absent in the Hudson Bay basin.
The Paleozoic sedimentation, typical of a cratonic basin (Figure 1), started in Upper Ordovician time with basal orthoquartzitic sandstones, and continued with platform-type limestones and dolomites with some anhydride and salt (Bad Cache Rapids and Churchill River Groups). Oil shales 2 to 8 cm (1 to 3 in) thick are interbedded in the upper part of Bad Cache Rapids group carbonates outcropping on Southampton Island. A few similar but thinner interbeds, in a similar position, occur in carbonates in the Kaskattama well also onshore in the Hudson Bay Lowlands.