Evolution of the sverdrup basin, arctic canada |
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| Authors: | JF Sweeney |
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| Abstract: | Sverdrup Basin underwent three periods of sudden and pronounced increases in rates of subsidence, beginning about 330, 225 and 124 m.y. ago. Subsidence curves indicate that initial high rates of subsidence (up to 11 cm/1000 year) decreased steadily for up to 100 m.y. until interrupted by the next sudden return to rapid subsidence. When the center of the basin was rapidly subsiding, areas adjacent to the basin were midly uplifting. The uplifted region expanded inward over a period 10–30 m.y. to include basin marginal zones thereby tending to shrink the area of active subsidence. Most of the observed record of basin subsidence (at least 70%) probably resulted from lithospheric response to loading of an initial depression. For most of basin history, deduced subsidence and peripheral uplift relations, together with the pattern of exponential decay constants determined from subsidence curves, are consistent with the loading response of a lithosphere modelled as a viscoelastic beam. |
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