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The AAPG/Datapages Combined Publications Database

CSPG Bulletin

Abstract


Bulletin of Canadian Petroleum Geology
Vol. 38 (1990), No. 1. (March), Pages 157-157

C.S.P.G. 1990 Convention, "Basin Perspectives"

Perspectives on Mesozoic and Cenozoic Basins in the Labrador Sea (Poster) [Abstract]

Bell, J.S.1

ABSTRACT

Current information on the geology, geophysics, geochemistry and biostratigraphy of the Labrador Sea and Shelf has recently been compiled in an atlas format that illustrates basin evolution. In Early Cretaceous time a complex of coast-parallel rift grabens developed along the Labrador Shelf. They were filled with continental clastics, coals and some marine shales. These sediments were then covered with a blanket of marine shales in Late Cretaceous time. Subsequent Cenozoic shelf deposition consisted of a series of seawardly-prograding clastic wedges that contained sandstones along their western margins. The best gas-bearing reservoirs are the Lower Cretaceous rift graben sandstones and underlying Paleozoic carbonates topping horst blocks. Geochemical evidence suggests that the main source rocks were Lower Cretaceous coals, and that the traps were filled in late Cenozoic time.

The Labrador Shelf is an excellent example of a simple passively-extended continental margin. The poster portrays its evolution through seafloor spreading, highlights the seismic expression of its structure, illustrates the deposition of reservoir sandstones and shows the present configuration of organic maturity in Mesozoic sediments. The atlas from which this material is derived also contains extensive information on Quaternary geology, deep water sediments on the floor of the Labrador Sea, biostratigraphy, paleogeography and geophysics.

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ACKNOWLEDGMENTS AND ASSOCIATED FOOTNOTES

1 Geological Survey of Canada, Calgary T2L 2A7

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