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Provenance of Quaternary Sediments on the Labrador Continental Shelf and Slope
Roger M. Slatt, Alexander B. Lew
Textural and petrographic analysis of Quaternary sediments from twenty-one piston cores obtained at six locations on the Labrador continental shelf and slope has shown the following: (a) sand-silt-clay and silty sand are the most common sediments, (b) texture of sediment in cores obtained at closely spaced intervals varies with water depth, and (c) mineralogic composition of core sediments is broadly related to the Precambrian crystalline rocks of Labrador.
The results show that these are relict sediments. They were glacially derived from Labrador or the equivalent Precambrian rocks exposed on the inner shelf during intervals of Pleistocene lower sea level, and transported eastward. Mesozoic/Tertiary coastal plain strata underlying the outer shelf were a lesser sediment source. Submarine reworking of the deposits has occurred.
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